阅读说明：本技术 一种手持式应用于髌骨修复术的医疗器械 (Medical instrument applied to patella repair operation in handheld mode ) 是由 不公告发明人 于 2020-06-10 设计创作，主要内容包括：本发明公开一种手持式应用于髌骨修复术的医疗器械,包括手持基座、连接机构、双线头收紧机构、单线头收紧机构,手持基座可通过连接机构实现与双线头收紧机构和单线头收紧机构的快速连接和解脱,即手持基座与连接机构之间采用模块化连接结构,手持基座用于实现双线头收紧机构和单线头收紧机构的位置和姿态调整,并可为收紧钢丝线提供驱动力,两种驱动模式可根据手术实际情况和医务人员的使用习惯进行随意切换,双线头收紧机构、单线头收紧机构与连接机构之间亦采用模块化连接结构,亦均可实现快速连接和解脱,双线头收紧机构可对双线头引出的钢丝线和两根单线头引出的钢丝线进行收紧,单线头收紧机构可对一根单线头引出的钢丝线进行收紧。(The invention discloses a handheld medical instrument applied to patellar repair, which comprises a handheld base, a connecting mechanism, a double-wire-head tightening mechanism and a single-wire-head tightening mechanism, wherein the handheld base can be quickly connected with and disconnected from the double-wire-head tightening mechanism and the single-wire-head tightening mechanism through the connecting mechanism, namely, a modular connecting structure is adopted between the handheld base and the connecting mechanism, the handheld base is used for realizing the position and posture adjustment of the double-wire-head tightening mechanism and the single-wire-head tightening mechanism and providing driving force for tightening a steel wire, the two driving modes can be randomly switched according to the actual conditions of surgery and the using habits of medical personnel, the modular connecting structures are also adopted between the double-wire-head tightening mechanism, the single-wire-head tightening mechanism and the connecting mechanism, the quick connection and disconnection can be realized, and the double-wire-head tightening mechanism can tighten the steel wire led out by the double-wire-head and the steel wire led out, the single-thread-end tightening mechanism can tighten a steel wire led out by one single thread end.)

1. The utility model provides a medical instrument of patellar repair art is applied to hand-held type, includes handheld base (1), coupling mechanism (2), two first tightening mechanism (3), single line head tightening mechanism (4), its characterized in that: handheld base (1) can realize high-speed joint and the release with coupling mechanism (2), double-thread tightening mechanism (3), also adopt modular connection structure between single-thread tightening mechanism (4) and coupling mechanism (2), all can realize high-speed joint and release, handheld base (1) can supply medical personnel to carry out handheld operation, and fix a position and adjust the gesture to double-thread tightening mechanism (3) and single-thread tightening mechanism (4), and can tighten up the steel wire for double-thread tightening mechanism (3) and single-thread tightening mechanism (4) and provide drive power, double-thread tightening mechanism (3) can tighten up the steel wire that two single-thread heads were drawn forth and the steel wire that two single-thread heads were drawn forth, single-thread tightening mechanism (4) can tighten up the steel wire that a single-thread head was drawn forth.

2. A hand-held medical device for patellar repair according to claim 1, wherein: the handheld base (1) comprises a base (101), a top plate (102), a lifting shaft (103), a left stop lever (104), a middle stop lever (105), a right stop lever (106), a sliding table spring (107), a rack (108), a lifting frame (109), a central bevel gear (110), a left connecting rod (111), a left gear set (112), a left swinging piece (113), a left conical top (114), a first spring (115), an arc groove swinging plate (116), a right conical top (117), a right swinging piece (118), a right gear set (119), a right connecting rod (120), a sliding table (121), a parallel rod (122), a trigger spring (123), a trigger (124), a right swinging spring (125), a right rotating sleeve (126), a left rotating sleeve (127) and a left swinging spring (128), wherein the top plate (102) and the base (101) provide support for the movement of the above components, the central bevel gear (110) and the top plate (102) form a rotating pair, the lifting shaft (103) is connected with the central bevel gear (110) through a spline to form a sliding pair, the left gear set (112) and the right gear set (119) can rotate and move up and down relative to the base (101), the left stop lever (104) can move up and down and position the left gear set (112) through the left swing spring (128), the left cone top (114), the left swing piece (113) and the left rotating sleeve (127), the right stop lever (106) can move up and down and position the right gear set (119) through the right swing spring (125), the right cone top (117), the right swing piece (118) and the right rotating sleeve (126), the middle stop lever (105) can move up and down and position the lifting shaft (103) through the first spring (115), the arc groove swing plate (116), the left connecting rod (111), the right connecting rod (120) and the lifting frame (109), and reciprocating actions of the sliding table (121) and the trigger (124) can be realized through the sliding table spring (107), The parallel rod (122) and the trigger spring (123) realize the reciprocating engagement and disengagement of the rack (108) and the left gear set (112) or the right gear set (119), so that the forward rotation or the reverse rotation of the lifting shaft (103) is realized through the engagement of the left gear set (112) or the right gear set (119) and the central bevel gear (110), and the tightening or loosening of the steel wire by the double-wire-end tightening mechanism (3) or the single-wire-end tightening mechanism (4) is realized;

the upper end of the base (101) is a square cavity, the lower end of the base is provided with a handle (101.1), the two sides of the interior of the square cavity are provided with a left support plate (101.3) and a right support plate (101.2), the front end of the bottom of the square cavity is provided with a square empty groove, the two sides of the empty groove are provided with guide rail structures, a left gear set (112) is arranged in a round hole at the end part of the left support plate (101.3) and can rotate and move up and down relative to the left support plate (101.3), a right gear set (119) is arranged in a round hole at the end part of the right support plate (101.2) and can rotate and move up and down relative to the right support plate (101.2), the top plate (102) is fixedly connected with the upper end of the base (101) through screws, the upper side of the top plate (102) is provided with four inserting columns (102.1), the top end of each inserting column (102.1) is provided with an inclined surface, the middle position is provided, central bevel gear (110) is installed in the round hole of bevel gear frame (102.2), constitute the revolute pair, central bevel gear (110) center upper end is equipped with the internal spline, lift axle (103) upper end and lower extreme are external spline structure, lift axle (103) can be close to the round hole internal spline cooperation installation of intermediate position and reciprocate at roof (102), the external spline of lift axle (103) lower extreme and the internal spline cooperation installation of central bevel gear (110) upper end, and can reciprocate in the internal spline and can not break away from, round hole and lift axle (103) coaxial arrangement that lift (109) center was equipped with, and can drive lift axle (103) and reciprocate.

3. A hand-held medical device for patellar repair according to claim 2, wherein: the left gear set (112) is provided with an upper bevel gear structure and a lower bevel gear structure, a left rotating sleeve (127) is arranged at the top end of the left gear set (112) and forms a rotating pair which can drive the left gear set (112) to move up and down, the left end of a left swinging piece (113) is of a plane structure, the right end of the left swinging piece (113) is provided with a long groove opening, the middle position of the left swinging piece and a top plate (102) form a rotating pair, extension shafts arranged at two ends of the left rotating sleeve (127) can slide in the long groove opening at the right end of the left swinging piece (113), the middle position of a left stop lever (104) and the top plate (102) form a rotating pair, the rotating shaft center and the rotating shaft center of the left swinging piece (113) are at the same horizontal height, the left end of the left stop lever (104) is of a plate-shaped structure which is convenient to pull up and down, a left swinging spring (128) and a left cone top (114) are arranged in the round hole at the right end, the left swinging, and can slide on the plane structure; the right gear set (119) is provided with an upper bevel gear structure and a lower bevel gear structure, a right rotating sleeve (126) is arranged at the top end of the right gear set (119) and forms a rotating pair which can drive the right gear set (119) to move up and down, the left end of a right swinging piece (118) is of a plane structure, the right end of the right swinging piece (118) is provided with a long groove opening, the middle position of the right swinging piece (118) and a top plate (102) form a rotating pair, extension shafts arranged at two ends of the right rotating sleeve (126) can slide in the long groove opening at the right end of the right swinging piece (118), the middle position of a right stop lever (106) and the top plate (102) form a rotating pair, the rotating axis and the rotating axis of the right swinging piece (118) are at the same horizontal height, the left end of the right stop lever (106) is of a plate-shaped structure which is convenient to be pulled up and down, a right swinging spring (125) and a right conical top (117) are arranged in a round hole at the right end, the right swinging, and can slide on the plane structure;

in an initial state, the left stop lever (104) is in an upward pulling state, the left swing spring (128) pushes the right end of the left cone top (114) to tightly push against the lower edge of the left end plane structure of the left swinging piece (113), and due to the lever action, the long groove opening at the right end of the left swinging piece (113) lifts the left rotating sleeve (127) to a high position, so that the left gear set (112) moves upwards to the high position, and the upper bevel gear structure of the left gear set (112) is disengaged from the central bevel gear (110); the right stop lever (106) is in an upward pulling state, a right swing spring (125) pushes the right end of a right cone top (117) to tightly push against the lower edge of a left end plane structure of the right swing piece (118), and due to the lever action, a long groove opening at the right end of the right swing piece (118) lifts the right rotating sleeve (126) to a high position, so that the right gear set (119) moves upwards to the high position, and an upper bevel gear structure of the right gear set (119) is disengaged from the central bevel gear (110); namely, in the initial state, the left gear lever (104) and the right gear lever (106) are both in an upward pulling state, and the left gear set (112) and the right gear set (119) are both in a high position disengaged from the central bevel gear (110);

when the left stop lever (104) is pulled anticlockwise downwards, the left swing spring (128) pushes the right end of the left conical top (114) to slide from the lower edge to the upper edge of the left end planar structure of the left swing piece (113), in the process, the left swing spring (128) is compressed and then extends, the left swing piece (113) rotates clockwise, the left gear set (112) moves downwards to a low position, and the upper bevel gear structure of the left gear set (112) is meshed with the central bevel gear (110); when the left stop lever (104) is pulled upwards clockwise, the left gear set (112) moves upwards to a high position and is disengaged from the central bevel gear (110);

when the right stop lever (106) is pulled downwards anticlockwise, the right swing spring (125) pushes the right end of the right conical top (117) to slide from the lower edge to the upper edge of the left end plane structure of the right swing piece (118), in the process, the right swing spring (125) is compressed and then extends, the right swing piece (118) rotates clockwise, the right gear set (119) moves downwards to a low position, and the upper bevel gear structure of the right gear set (119) is meshed with the central bevel gear (110); when the right bar (106) is pulled clockwise upward, the right gear set (119) moves upward to a high position and is disengaged from the central bevel gear (110).

4. A hand-held medical device for patellar repair according to claim 2, wherein: the left ends of a left connecting rod (111) and a right connecting rod (120) and a top plate (102) form a coaxial rotating pair, the right ends of the left connecting rod and the right connecting rod form a long-strip empty groove, extension shafts arranged at the two ends of a lifting frame (109) respectively slide in the long-strip empty grooves at the right ends of the left connecting rod (111) and the right connecting rod (120), the middle position of an arc groove swinging plate (116) and the top plate (102) form a rotating pair, the rotating axis of the arc groove swinging plate is coaxial with the rotating axis of the left connecting rod (111) and the right connecting rod (120), the left end of the arc groove swinging plate (116) is provided with a cross rod, the right end of the arc groove swinging plate (116) is provided with an arc empty groove, the extension shafts arranged at the outer side of the middle position of the left connecting rod (111) and the right connecting rod (120) slide in the arc empty groove at the right end of the arc groove swinging plate (116), the middle position of a middle blocking rod (105) and a base (101) form a rotating pair, the left end of the middle blocking rod, a first spring (115) is arranged between the cross rod at the left end of the arc groove swinging plate (116) and the top plate (102), the first spring (115) is always in a stretched state, and the axle center of the mounting position at the right end of the first spring and the rotating axle center of the middle stop lever (105) are at the same horizontal height;

in an initial state, the middle stop lever (105) is in a downward pulling state, the first spring (115) tensions the cross rod at the left end of the arc groove swinging plate (116) to enable the cross rod to have a clockwise rotation trend, the upper end of the arc empty groove at the right end of the arc groove swinging plate (116) downwards props against the extending shafts of the left connecting rod (111) and the right connecting rod (120), the latter two have a clockwise rotation trend, and the lifting frame (109) drives the lifting shaft (103) to be at a low position;

the middle stop lever (105) is pulled upwards clockwise, in the process, the first spring (115) extends firstly and then shortens, the arc groove swinging plate (116) rotates anticlockwise, the lower end of an arc empty groove at the right end of the arc groove swinging plate (116) upwards props against extension shafts of the left connecting rod (111) and the right connecting rod (120), the left connecting rod (111) and the right connecting rod (120) rotate anticlockwise, and the lifting frame (109) drives the lifting shaft (103) to move upwards to a high position, so that the lifting shaft (103) extends upwards; when the middle stop lever (105) is pulled downwards anticlockwise, the lifting frame (109) drives the lifting shaft (103) to move downwards to a low position, and the lifting shaft (103) retracts downwards.

5. A hand-held medical device for patellar repair according to claim 2, wherein: the sliding table (121) is arranged in a square hollow groove at the front end of the bottom of a square cavity of the base (101) to form a sliding pair, a sliding table spring (107) is arranged between the top end of the sliding table (121) and the front side of the square cavity of the base (101), a middle finger wrench (121.1) is arranged at the lower end of the sliding table (121), a left conical rack (108.2) and a right conical rack (108.1) are arranged on two sides of the rear end of each rack, a parallel rod (122), a rack (108) and the sliding table (121) form a rotating pair, the upper end of a trigger (124), the rack (108) and the sliding table (121) form a rotating pair, a quadrilateral structure is formed by the rack (108), the sliding table (121), the parallel rod (122) and the trigger (124), a trigger spring (123) is arranged between the middle position of the parallel rod (122) and the lower end;

in the initial state, under the action of the contraction and pulling force of a sliding table spring (107), the sliding table is positioned at the front end of a square cavity of the base (101), under the action of the contraction and pulling force of a trigger spring (123), a trigger (124) is in a forward extending state, and a rack (108) is in a low position;

if the central bevel gear (110) needs to rotate clockwise, the left stop lever (104) is pulled upwards to enable the left gear set (112) to be in a high position and to be disengaged from the central bevel gear (110), the right stop lever (106) is pulled downwards to enable the right gear set (119) to be in a low position, and the upper bevel gear structure of the right gear set (119) is engaged with the central bevel gear (110); the palm holds the handle, so that the thumb, the ring finger and the little finger hold the handle, the middle finger hooks the middle finger wrench (121.1), and the index finger hooks the trigger (124); firstly, the forefinger pulls the trigger (124) backwards to enable the trigger (124) to rotate clockwise, due to the structural characteristics of the parallelogram, the rack (108) moves upwards to the height meshed with the lower bevel gear structure of the right gear set (119), then the forefinger and the middle finger pull the middle finger wrench (121.1) and the trigger (124) backwards together to enable the rack (108) to be kept at a high position and move backwards, the right bevel rack (108.1) is meshed with the lower bevel gear structure of the right gear set (119), and the right gear set (119) rotates anticlockwise, so that the clockwise rotation of the central bevel gear (110) is realized; when the sliding table (121) moves to the rearmost end of the square empty groove of the base (101), the forefinger firstly loosens the trigger (124) to enable the sliding table to rotate forwards, the rack (108) descends to a low position under the action of the tensile force of the trigger spring (123) and is disengaged from the lower bevel gear structure of the right gear set (119), then the middle finger wrench (121.1) is loosened forwards, and the sliding table (121) moves forwards to an initial position under the action of the tensile force of the sliding table spring (107); the steps are repeated to realize the clockwise continuous rotation of the central bevel gear (110);

if the central bevel gear (110) needs to rotate anticlockwise, the left stop lever (104) is pulled downwards to enable the left gear set (112) to be in a low position, an upper bevel gear structure of the left gear set (112) is meshed with the central bevel gear (110), and the right stop lever (106) is pulled upwards to enable the right gear set (119) to be in a high position and to be disengaged from the central bevel gear (110); the palm holds the handle, so that the thumb, the ring finger and the little finger hold the handle, the middle finger hooks the middle finger wrench (121.1), and the index finger hooks the trigger (124); firstly, the forefinger pulls the trigger (124) backwards to enable the trigger (124) to rotate clockwise, due to the structural characteristics of the parallelogram, the rack (108) moves upwards to the height meshed with the lower bevel gear structure of the left gear set (112), then the forefinger and the middle finger pull the middle finger wrench (121.1) and the trigger (124) backwards together to enable the rack (108) to be kept at a high position and move backwards, the left bevel rack (108.2) is meshed with the lower bevel gear structure of the left gear set (112), and the left gear set (112) rotates clockwise, so that the counterclockwise rotation of the central bevel gear (110) is realized; when the sliding table (121) moves to the rearmost end of the square empty groove of the base (101), the forefinger firstly loosens the trigger (124) to enable the sliding table to rotate forwards, the rack (108) descends to a low position under the action of the tensile force of the trigger spring (123) and is disengaged from the lower bevel gear structure of the right gear set (119), then the middle finger wrench (121.1) is loosened forwards, and the sliding table (121) moves forwards to an initial position under the action of the tensile force of the sliding table spring (107); the continuous counterclockwise rotation of the central bevel gear (110) can be realized by repeating the above steps.

6. A hand-held medical device for patellar repair according to claim 1, wherein: the connecting mechanism (2) comprises a main body frame (201), a bottom plate (202), a clamping plate (203), a set screw (204), a button (205), a second spring (206), a third spring (207) and a hook (208), wherein a rectangular groove is arranged on the upper side of the front end of the main body frame (201), two rectangular jacks (201.1) are arranged at the front end of the rectangular groove, a vertically through round hole is arranged at the position close to the middle of the rectangular groove, a hook cavity and a button hole in the vertical direction are arranged in the rear end of the main body frame (201), the hook (208) is arranged in the hook cavity and can slide back and forth in the hook cavity, an inclined plane structure is arranged at the front end of the hook (208), a rectangular opening is arranged at the middle position, an inclined plane is arranged at the rear side of the button (205), the button (205) passes through the rectangular opening in the middle of the hook (208) and is arranged in the button hole of the main body frame (201), two set screws (204) are respectively arranged in the two threaded holes, two third springs (207) are respectively arranged between the two set screws (204) and the hook (208), the lower side surface of the main body frame (201) is provided with a clamping plate cavity, the clamping plate (203) is arranged in the clamping plate cavity, and can move back and forth in the clamping plate cavity, four horseshoe-shaped openings are arranged on the clamping plate, a pressing plate is arranged at the rear end of the clamping plate (203), a rectangular opening is arranged at the middle position, a second spring (206) is arranged between the front position of the clamping plate (203) and the main body frame (201), four round holes for inserting the inserting columns (102.1) are arranged on the bottom plate (202), the bottom plate (202) is arranged at the lower side of the main body frame (201), the bottom plate (202) and the rectangular groove middle round hole of the main body frame (201) are coaxially provided with a through round hole;

in an initial state, under the action of the elastic force of a third spring (207), the hook (208) is positioned at the front end of the hook cavity, the inclined plane structure at the front end of the hook (208) extends into the rectangular groove on the upper side of the front end of the main body frame (201), the button (205) is pressed downwards, the inclined plane at the rear side pushes the hook (208) to move backwards, and the inclined plane structure at the front end of the hook (208) retracts into the hook cavity; after the press of the button (205) is released, the hook (208) is restored to the initial position under the action of the elastic force of the third spring (207);

under the action of the elasticity of a second spring (206), the clamping plate (203) is positioned at the rear end of the clamping plate cavity, four insertion columns (102.1) arranged on the top plate (102) are inserted into four round holes arranged on the bottom plate (202), under the action of inclined planes at the top ends of the insertion columns (102.1) and the second spring (206), the clamping plate (203) slides forwards and rebounds backwards, and linear edges of four horseshoe-shaped openings in the clamping plate (203) are clamped into hooks at the middle positions of the four insertion columns (102.1), so that the quick connection of the connecting mechanism (2) and the handheld base (1) is realized; the pressing plate at the rear end of the clamping plate (203) is pressed to enable the pressing clamping plate (203) to move forwards, and after the straight edges of the four horseshoe-shaped openings are separated from the hooks at the middle positions of the four inserting columns (102.1), the connecting mechanism (2) is taken away upwards, so that the connecting mechanism (2) and the handheld base (1) can be quickly disengaged;

the set screw (204) and the main body frame (201) form a thread pair connection, and the pressing and rebounding force of the button (205) can be adjusted by adjusting the pre-tightening elastic force of the third spring (207).

7. A hand-held medical device for patellar repair according to claim 1, wherein: the double-wire-head tightening mechanism (3) comprises a double-wire-head rack (301), a fifth hand wheel (302), a first wrench (303), a first winding drum (304), a first locking knob (305), a left guide wheel (306), a left connecting rod (307), a sliding groove component (308), a screw rod (309), a left connecting rod (310), a left long rod (311), a left second guide wheel (312), a left three guide wheel (313), a right three guide wheel (314), a right second guide wheel (315), a right long rod (316), a right second connecting rod (317), a right connecting rod (318), a right guide wheel (319), a second locking knob (320), a second winding drum (321), a second wrench (322), a first bevel gear set (323), a right end cover (324), a second worm gear set (325), a first planetary bevel gear set (326), a left end cover (327), a second bevel gear set (328), a second planetary bevel gear set (329), a left connecting rod (307), a first locking knob (307), a, A left second connecting rod (310), a left long rod (311) is arranged at the left front end of the double-thread-head rack (301), the four form a trapezoid, a right connecting rod (318), a right second connecting rod (317), a right long rod (316) is arranged at the right front end of the double-thread-head rack (301), the four form a trapezoid, a chute piece (308) and a screw (309) are arranged at the middle position of the front end of the double-thread-head rack (301) and used for adjusting the opening positions of the left long rod (311) and the right long rod (316), a first wrench (303), a first winding drum (304), a first locking knob (305) is arranged at the left side of the double-thread-head rack (301) and used for tightening a left thread head (6.1) or a first steel wire, a second locking knob (320), a second winding drum (321), a second wrench (322) is arranged at the right side of the double-thread-head rack (301) and used for tightening a right thread head (6.2) or a second steel wire, and a fifth hand wheel (302) is formed by a first hand, The transmission structure consisting of the right end cover (324), the second worm gear (325), the first planetary bevel gear (326), the left end cover (327), the second bevel gear set (328) and the second planetary bevel gear (329) drives the first winding drum (304) and the second winding drum (321) to rotate, so that the steel wire led out by the double wire heads or the steel wire led out by the two single wire heads is tightened and loosened.

8. A hand-held medical device for patellar repair according to claim 7, wherein: two extending arms are respectively arranged at two sides of the front end of the double-line head rack (301), the rear end of the double-line head rack (301) is of a double-layer structure formed by an upper plate and a lower plate, a threaded hole is arranged in the middle of the upper plate of the double-line head rack (301), the lower plate is of a rectangular structure with the same size as the rectangular groove on the upper side of the front end of the main body rack (201), two inserting plates (301.1) are arranged at the front end of the lower plate, coaxial and through round holes are formed in the rear ends of the upper plate and the lower plate, a hand wheel structure is arranged at the upper end of a fifth hand wheel (302) and can be operated by hands and is convenient to rotate, a worm structure is arranged in the middle of the fifth hand wheel (302), an internal spline is arranged at the lower end of the lower plate, the fifth hand wheel (302) is arranged in the round holes in the rear ends of the upper plate and the lower plate of the double-line head rack (301), the upper plate and the lower plate form a, the bevel gear set and the left end cover are respectively in a rotating pair with the second worm gear (325), the right end cover (324) is in fastening connection with the right end of the second worm gear (325) through a screw, the left end cover (327) is in fastening connection with the left end of the second worm gear (325) through a screw, the first bevel gear set (323) and the right end cover (324) form a rotating pair, both ends of the first bevel gear set (323) are respectively provided with a bevel gear structure, the bevel gear structure at the left end is simultaneously meshed with the first planetary bevel gear (326) and the second planetary bevel gear (329), the second bevel gear set (328) and the left end cover (327) form a rotating pair, both ends of the second bevel gear set (328) are respectively provided with a bevel gear structure, and the bevel gear structure at the right end is simultaneously meshed with the first planetary bevel gear (;

the side surface of the cylinder of the first winding drum (304) is internally provided with a variable diameter groove, which can lead the left thread end (6.1) to be excessively smooth and smooth, the width of the variable diameter groove can only accommodate the penetration of a single steel wire, a first wrench (303) is arranged at a position close to the bottom end of the variable-diameter groove, an eccentric wheel structure is arranged at the lower end of the first wrench (303), a left thread end (6.1) penetrates through the variable-diameter groove and passes through a gap between the eccentric wheel and the variable-diameter groove, the first wrench (303) is pulled anticlockwise, the eccentric wheel structure can be tightly pressed on the left thread end (6.1), a threaded hole is arranged in the first winding drum (304), the first locking knob (305) and the threaded hole form a thread pair, the first winding drum (304) is arranged on the left side of the double-thread-end rack (301), the first winding drum and the double-thread-end rack form a rotating pair, the lower end of the first winding drum (304) is provided with a bevel gear structure, the bevel gear structure is meshed with a bevel gear structure at the left end of a second bevel gear set (328); the cylindrical side surface of the second winding drum (321) is internally provided with a variable diameter groove, so that the right thread end (6.2) penetrating into the groove is excessively smooth, the width of the variable diameter groove can only accommodate the penetration of a single steel wire, a second spanner (322) is arranged at the position close to the bottom end of the variable diameter groove, an eccentric wheel structure is arranged at the lower end of the second spanner (322), the second spanner (322) is pulled clockwise after a right thread end (6.2) penetrates through the variable diameter groove and passes through a gap between the eccentric wheel and the variable diameter groove, the eccentric wheel structure can be tightly pressed on the right thread end (6.2), a threaded hole is arranged in the second winding drum (321), the threaded hole of the second locking knob (320) forms a thread pair, the second winding drum (321) is arranged on the right side of the double-thread-end rack (301) and forms a rotating pair, the lower end of the second winding drum (321) is provided with a bevel gear structure, the bevel gear structure is meshed with a bevel gear structure at the right end of the first bevel gear set (323);

the front end of the screw rod (309) is provided with a manually rotatable disc structure, the rear end of the screw rod is of a thread structure, the thread structure is matched and installed with a threaded hole in the middle of the upper plate of the double-thread-end rack (301) to form a thread pair, the middle of the sliding groove piece (308) is provided with a round hole, the left side and the right side of the sliding groove piece are provided with a long-strip opening, the screw rod (309) is installed in the round hole in the middle of the sliding groove piece (308), and the screw rod (309) and the round;

one end of a left connecting rod (307) and a projecting arm on the left side of the double-thread-head rack (301) form a rotating pair, the other end and the rear end of a left long rod (311) form a rotating pair, one end of a left two connecting rod (310) and the projecting arm on the left side of the double-thread-head rack (301) form a rotating pair, the other end and the middle position of the left long rod (311) form a rotating pair, a left two guide wheel (312) and a left three guide wheel (313) are arranged at the front end of the left long rod (311), a left guide wheel (306) is arranged at the rear end of the left long rod (311), a projecting shaft which extends downwards is arranged at the rear end of the left long rod (311) and can slide in a long opening on;

the right connecting rod (318) one end constitutes the revolute pair with the cantilever on double thread end frame (301) right side, the other end constitutes the revolute pair with right stock (316) rear end, two right connecting rod (317) one end constitutes the revolute pair with the cantilever on double thread end frame (301) right side, the other end constitutes the revolute pair with right stock (316) intermediate position, right stock (316) front end is equipped with two right guide wheels (315) and three right guide wheels (314), right stock (316) rear end is equipped with a right guide wheel (319), and right stock (316) rear end is equipped with a protrusion axle that stretches out downwards, this protrusion axle can slide in the rectangular trompil on chute spare (308) right side.

9. A hand-held medical device for patellar repair according to claim 7, wherein: the length of the left connecting rod (307) and the right connecting rod (318) is 40mm, the length of the left connecting rod (310) and the right connecting rod (317) is 35mm, the distance between the left end axle center of the left connecting rod (307) and the left end axle center of the left connecting rod (310) is 45mm, the distance between the right end axle center of the left connecting rod (307) and the right end axle center of the left connecting rod (310) is 50mm, the distance between the right end axle center of the right connecting rod (318) and the right end axle center of the right connecting rod (317) is 45mm, the distance between the left end axle center of the right connecting rod (318) and the left end axle center of the right connecting rod (317) is 50mm, and unequal sides formed by the parts can enable the left three guide wheels (313) and the right three guide wheels (314) to have a larger distance adjusting range;

in the initial state, the screw (309) retracts into a threaded hole in the middle of the upper plate of the double-thread-head rack (301), the left three guide wheel (313) and the right three guide wheel (314) are closest to each other, when the screw (309) is screwed out of the threaded hole, the sliding chute piece (308) moves forwards, so that the left long rod (311) and the right long rod (316) move forwards, and in the process, due to the action of a quadrangle with a specific side length formed by the left extending arm, the left connecting rod (307), the left two connecting rods (310), the left long rod (311), the right extending arm, the right connecting rod (318), the right two connecting rods (317) and the right long rod (316) of the double-thread-head rack (301), the front ends of the left long rod (311) and the right long rod (316) are opened, so that the left three guide wheel (313) and the right three guide wheel (314) can be adjusted to the distance required by the operation; after the screw (309) is screwed into the threaded bore, the components return to the initial state.

10. A hand-held medical device for patellar repair according to claim 1, wherein: the single-thread-head tightening mechanism (4) comprises a single-thread-head rack (401), a sixth hand wheel (402), a third winding drum (403), a third wrench (404) and a worm gear group (405), wherein a lead hole is formed in the front end of the single-thread-head rack (401), the rear end of the single-thread-head rack is of a double-layer structure formed by an upper plate and a lower plate, the lower plate is of a rectangular structure with the same size as the rectangular groove on the upper side of the front end of the main body rack (201), two inserting plates are arranged at the front end of the lower plate, coaxial and through round holes are formed in the rear ends of the upper plate and the lower plate, the upper end of the sixth hand wheel (402) is of a hand wheel structure and can be operated by hand and conveniently rotated, a worm structure is arranged in the middle of the lower end of the sixth hand wheel (402), an inner spline is arranged in the round holes in the rear ends of the upper plate and the lower plate at the rear end of the single-thread-head rack (, the right end of the worm wheel structure is meshed with a worm structure in the middle of the sixth hand wheel (402);

be provided with a variable diameter recess in third reel (403) cylinder side, can make single wire head steel wire (5) excessively slick and sly that penetrate wherein, variable diameter recess width can only hold single steel wire and penetrate, install third spanner (404) in the position that is close to variable diameter recess bottom, third spanner (404) lower extreme is equipped with the eccentric wheel structure, single wire head steel wire (5) penetrate variable diameter recess and pass through behind the gap between eccentric wheel and the variable diameter recess, clockwise wrench (404), can make the eccentric wheel structure compress tightly single wire head steel wire (5), third reel (403) are installed in single wire head frame (401) right side, both constitute the revolute pair, third reel (403) lower extreme is equipped with the bevel gear structure, this bevel gear structure meshes with the bevel gear structure of worm wheel set (405) left end.

Technical Field

The invention relates to the technical field of medical instruments, in particular to a handheld medical instrument applied to patella repair.

Background

The kneecap is positioned in front of the knee joint, is the largest seed bone in a human body and is embedded in the quadriceps femoris tendon, is a triangular flat bone and participates in the formation of the knee joint, and the kneecap has the main functions of protecting the knee joint, avoiding the friction of the quadriceps femoris tendon on the cartilage surface of the condyle of the femur, transmitting the strength of the quadriceps femoris muscle and participating in the formation of a knee stretching device; also has the functions of maintaining the stability of the knee joint in the semi-squatting position, preventing the excessive adduction, abduction and flexion of the knee joint, having the function of a bicycle chain and increasing the rotation capacity of the knee joint.

Patellar fracture is a common fracture type in clinic, has high incidence rate, accounts for about 10 percent of all fractures, and is often caused by direct violence, indirect violence and mixed violence; the direct violence is mostly directly hit on the patella due to external force, such as bruise, kicking injury and the like, the fracture is mostly comminuted, the anterior tendinous membrane of the patella, the two side aponeuroses of the patella and the joint capsule are mostly kept intact, and the fracture can also be transverse fracture; indirect violence is usually caused by the violent contraction of quadriceps femoris muscle, which causes traction injury, such as sudden slipping, half flexion of knee joint, sudden contraction of quadriceps femoris muscle, upward traction of patella, and fixation of patella ligament at the lower part of patella, thereby causing fracture of patella.

When the patella fracture is repaired in a surgical mode, firstly, the patella main body and the fracture part need to be reset, then the patella main body and the fracture part are connected through the steel nails, in order to keep the stability of the fracture part after the fracture part is reset, the steel nails need to be arranged in an array along the circumferential direction of the patella, then, steel wires penetrate through the steel nails and are fastened and cut off, in the process of tightening the steel wires, tightening equipment needs to be used for operation, and generally, the following three conditions are common in the leading-out modes after the steel wires fix the steel needles, one is leading out of one single wire head, one is leading out of two wire heads, and the other is leading out of two single wire heads; at present, operations of leading out single-thread steel wire wires and leading out double-thread steel wire wires are respectively operated by two different tightening devices, and the operations of leading out two single-thread steel wire wires need two single-thread tightening devices, so that the medical cost is wasted, the space occupancy rate of the operation devices is increased, and the convenience of operation of doctors is influenced.

The Chinese patent with publication number CN110037788A discloses a medical instrument applied to patellar fracture repair, which comprises a rotating mechanism, a single-thread-head tensioning mechanism, a double-thread-head tensioning mechanism, a tensioning control mechanism and a power source, wherein the single-thread-head tensioning mechanism and the double-thread-head tensioning mechanism are respectively positioned at two ends of the rotating mechanism; after analysis, the technical scheme related in the invention patent has the following defects:

1) one device cannot solve the problem of operation involving two single-line head leading-out operations, and in case of the operation, two medical staff can only be used for operating the two devices to participate in the operation, so that medical resources are wasted, the working space of a doctor is occupied, and the operation efficiency is reduced;

2) in the technical scheme related to the invention patent, a single-thread-head tensioning mechanism and a double-thread-head tensioning mechanism are respectively positioned at two ends of a rotating mechanism, namely the equipment is simultaneously provided with the single-thread-head tensioning mechanism and the double-thread-head tensioning mechanism, but only one tensioning mechanism is applied in the operation, and the other tensioning mechanism is idle, and the equipment is operated by hands, so that the idle tensioning mechanism not only occupies the operation space, but also increases the load of arms when the medical personnel operate and increases the burden of the medical personnel;

3) referring to the patent document specifications [0065], [0066], [0067] and the drawings 23, 24 and 25 in the attached drawings, as the sleeve I (311) with the driving helical teeth (312) and the sleeve II (313) with the driven helical teeth (314) are adopted for transmission, the technical effect which is expected to be realized is that one-way transmission cannot be realized; in the process of tightening the steel wire, a doctor needs to try tightening force for multiple times before tying the steel wire head to enable the reduction of the bone gap to achieve the best effect, so that in the process of tightening the steel wire, if excessive tightening needs to be loosened, the equipment related in the patent cannot achieve the technical effect of loosening the steel wire, only the first hand-screwed bolt (214) or the second hand-screwed bolt (227) can be opened to loosen the compressed steel wire head, and after the initial state of the equipment is recovered, the compressed steel wire head is tightened again, so that the operation efficiency is seriously influenced, and secondary injury is also caused to the damaged patella;

4) because the driving helical gear (312) and the driven helical gear (314) are actually ratchet transmission structures, the number of teeth is certain, the minimum step number which can be realized by rotating a circle in the circumferential direction is also certain, and stepless transmission cannot be realized, so that the embarrassment condition that one step is too loose and the other step is too tight easily occurs in the operation, even if the number of teeth of the helical gear is increased, the degree of too loose or too tight can only be reduced, and the over-loose or too tight degree cannot be completely eliminated, moreover, the number of teeth is increased, the tooth shape is reduced, the material has stress limit, and the number of teeth of the helical gear cannot be infinitely increased;

5) reference is made to the technical features described in the above patent document descriptions in paragraphs [0065], [0066] and [0067 ]: there is no transmission structure capable of self-locking between the first transition gear (315) and the driving shaft 238, so that the technical effect "when the first driving helical tooth 312 rotates reversely, the first driving helical tooth 312 extrudes the second driven helical tooth 314 and the second sleeve 313 floats away from the first sleeve 311" in paragraph [0065] cannot be achieved, because after the first tightening of the steel wire, the steel wire has a certain tension, which tends to rotate reversely the second driven helical tooth 314, and furthermore, the second sleeve 313 is tightly pressed against the second sleeve 313 by the floating spring 317, therefore, in practical situations, when the first driving helical tooth 312 rotates reversely, the second sleeve 313 does not float away from the first sleeve 311 but rotates reversely with the first driving helical tooth 312, so that the tightened steel wire is loosened, and the technical effect of repeatedly wrenching the wrench 305 to tighten the steel wire cannot be achieved, such technical defect that the technical solution related in the above patent cannot achieve its technical purpose, the defects in the prior art can not be solved.

Disclosure of Invention

In order to solve the defects of the prior art, the invention aims to provide a handheld medical instrument applied to patellar repair, which has the advantages of novel structure, convenience in operation and high modularization degree, can select proper modules to be quickly spliced according to the actual condition of an operation, saves the operation time, reduces the operation cost and improves the operation quality.

The technical scheme adopted by the invention is as follows: the utility model provides a medical instrument of patellar repair art is applied to hand-held type, includes handheld base, coupling mechanism, two first tightening mechanism of line, the first tightening mechanism of single line, its characterized in that: the handheld base can realize quick connection and release with coupling mechanism, double-thread tightening mechanism, also adopt modular connection structure between single-thread tightening mechanism and the coupling mechanism, all can realize quick connection and release, handheld base can supply medical personnel to carry out handheld operation, and fix a position and adjust the gesture to double-thread tightening mechanism and single-thread tightening mechanism, and can provide drive power for double-thread tightening mechanism and single-thread tightening mechanism tighten up the steel wire, double-thread tightening mechanism can tighten up the steel wire that two single-thread heads were drawn forth and the steel wire that two single-thread heads were drawn forth, single-thread head tightening mechanism can tighten up the steel wire that a single-thread head was drawn forth.

The handheld base comprises a base, a top plate, a lifting shaft, a left stop lever, a middle stop lever, a right stop lever, a sliding table spring, a rack, a lifting frame, a central bevel gear, a left connecting rod, a left gear set, a left swinging piece, a left cone top, a first spring, an arc groove swinging plate, a right cone top, a right swinging piece, a right gear set, a right connecting rod, a sliding table, a parallel rod, a trigger spring, a trigger, a right swinging spring, a right rotating sleeve, a left rotating sleeve and a left swinging spring The right swinging piece and the right rotating sleeve realize the up-and-down movement and positioning of the right gear set, the middle stop lever realizes the up-and-down movement positioning of the lifting shaft through the first spring, the arc groove swinging plate, the left connecting rod, the right connecting rod and the lifting frame, the reciprocating action of the sliding table and the trigger realizes the reciprocating engagement and disengagement of the rack and the left gear set or the right gear set through the sliding table spring, the parallel rod and the trigger spring, thereby realizing the forward rotation or the reverse rotation of the lifting shaft through the engagement of the left gear set or the right gear set and the central bevel gear, and realizing the tightening or loosening of the steel wire by the double-wire-end tightening mechanism or the single-.

Further, the upper end of the base is a square cavity, the lower end of the base is provided with a handle, the two sides inside the square cavity are provided with a left support plate and a right support plate, the front end of the bottom of the square cavity is provided with a square cavity, the two sides of the cavity are provided with guide rail structures, a left gear set is arranged in a round hole at the end part of the left support plate and can rotate and move up and down relative to the left support plate, a right gear set is arranged in a round hole at the end part of the right support plate and can rotate and move up and down relative to the right support plate, a top plate is fixedly connected with the upper end of the base through screws, the upper side of the top plate is provided with four inserting columns, the top end of each inserting column is provided with an inclined plane, the middle position of the top plate is provided with a hook, a round hole for a, the upper end and the lower end of the lifting shaft are both of an external spline structure, the lifting shaft can rotate and move up and down in a round hole of the top plate close to the middle position, an external spline at the lower end of the lifting shaft is matched with an internal spline at the upper end of the central bevel gear to be installed, the lifting shaft can move up and down in the internal spline and cannot be separated from the internal spline, and the round hole and the lifting shaft are coaxially installed and can drive the lifting shaft to move up and down.

Furthermore, an upper bevel gear structure and a lower bevel gear structure are arranged on the left gear set, a left rotating sleeve is arranged at the top end of the left gear set, the left rotating sleeve and the left gear set form a rotating pair and can drive the left gear set to move up and down, the left end of the left swinging piece is of a planar structure, a long groove opening is formed in the right end of the left swinging piece, a rotating pair is formed by the middle position of a left stop lever and the top plate, the rotating axis and the rotating axis of the left swinging piece are at the same horizontal height, the left end of the left stop lever is of a plate-shaped structure convenient to pull up and down, a left swinging spring and a left cone top are arranged in a round hole in the right end, the left swinging spring is always in a compressed state, and the cone tip at the right end of the left cone top tightly pushes up the planar structure at the left end of the left swinging piece and can slide on the planar; the right gear set is provided with an upper bevel gear structure and a lower bevel gear structure, the right rotating sleeve is installed at the top end of the right gear set, the right rotating sleeve and the right gear set form a rotating pair, the right gear set can be driven to move up and down, the left end of the right swinging piece is of a planar structure, the right end of the right swinging piece is provided with a long groove opening, the middle position of the right rotating sleeve and the top plate form a rotating pair, the rotating axis of the right swinging piece and the rotating axis of the right swinging piece are at the same horizontal height, the left end of the right blocking piece is of a plate-shaped structure convenient to pull up and down, a right swinging spring and a right cone top are installed in a round hole of the right end, the right swinging spring is always in a compressed state, and the cone tip at the right end of the right cone top tightly pushes up the planar structure at the left end of the right swinging piece and can.

Further, the left ends of the left connecting rod and the right connecting rod and the top plate form a coaxial revolute pair, the right ends are provided with strip-shaped empty grooves, extension shafts arranged at the two ends of the lifting frame respectively slide in the strip-shaped empty grooves at the right ends of the left connecting rod and the right connecting rod, the middle position of the arc groove swinging plate and the top plate form a revolute pair, the rotation axis of the revolute pair is coaxial with the rotation axis of the left connecting rod and the right connecting rod, the left end of the arc groove swinging plate is provided with a cross rod, the right end of the arc groove swinging plate is provided with an arc-shaped empty groove, the extension shafts arranged at the middle positions of the left connecting rod and the right connecting rod towards the outside slide in the arc-shaped empty groove at the right end of the arc groove swinging plate, the middle position of the middle blocking rod and the base form a revolute pair, the left end of the middle blocking rod is of a plate-shaped structure which is convenient to pull up and down, the right end of the, and the axle center of the right end mounting position of the middle stop lever and the rotation axle center of the middle stop lever are at the same horizontal height.

Furthermore, the sliding table is arranged in a square hollow groove at the front end of the bottom of the square cavity of the base to form a sliding pair, a sliding table spring is arranged between the top end of the sliding table and the front side of the square cavity of the base, a middle finger wrench is arranged at the lower end of the sliding table, a left bevel rack and a right bevel rack are arranged on two sides of the rear end of the rack, the parallel rod, the rack and the sliding table form a rotating pair, the upper end of the trigger, the rack and the sliding table form a rotating pair, the rack, the sliding table, the parallel rod and the trigger form a parallelogram structure, a trigger spring is arranged between the middle position of the parallel rod and the;

the connecting mechanism comprises a main body frame, a bottom plate, a clamping plate, set screws, a button, a second spring, a third spring and a hook, wherein a rectangular groove is arranged on the upper side of the front end of the main body frame, two rectangular jacks are arranged at the front end of the rectangular groove, a vertically through round hole is arranged at a position close to the middle of the rectangular groove, a hook cavity and a button hole in the vertical direction are arranged inside the rear end of the main body frame, the hook is arranged in the hook cavity and can slide back and forth in the hook cavity, an inclined surface structure is arranged at the front end of the hook, a rectangular opening is arranged at the middle of the hook, an inclined surface is arranged at the rear side of the button, the button passes through the rectangular opening in the middle of the hook and is arranged in the button hole of the main body frame, two threaded holes communicated with the hook cavity are arranged at the rear end of the main body frame, the two set, the cardboard is installed in the cardboard cavity, and can be in the cardboard cavity back-and-forth movement, be equipped with four horseshoe-shaped trompils on the cardboard, the cardboard rear end is equipped with one and presses the clamp plate, the intermediate position is equipped with the rectangle trompil, be provided with a second spring between cardboard front end position and the main part frame, be equipped with four round holes that are used for inserting the grafting post on the bottom plate, the bottom plate is installed in main part frame downside, and realize fastening connection between them through the screw, the round hole is equipped with the through hole with the axle center position in the middle of the bottom.

The double-end tightening mechanism comprises a double-end rack, a fifth hand wheel, a first wrench, a first winding drum, a first locking knob, a left first guide wheel, a left connecting rod, a chute piece, a screw rod, a left second connecting rod, a left long rod, a left second guide wheel, a left three guide wheel, a right two guide wheel, a right long rod, a right two connecting rod, a right first guide wheel, a second locking knob, a second winding drum, a second wrench, a first bevel gear set, a right end cover, a second worm gear, a first planet bevel gear, a left end cover, a second bevel gear set and a second planet bevel gear, wherein the left connecting rod, the left connecting rod and the left long rod are arranged at the left front end of the double-end rack, the four form an unequal-sided quadrangle, the right connecting rod, the right long rod and the right long rod are arranged at the right front end of the double-end rack, the four form an unequal-sided quadrangle, the chute, the fifth hand wheel drives the first winding drum and the second winding drum to rotate through a transmission structure consisting of a first bevel gear set, a right end cover, a second worm gear, a first planet bevel gear, a left end cover, a second bevel gear set and a second planet bevel gear, so that the steel wire led out by the double wire heads or the steel wire led out by the two single wire heads can be tightened and loosened.

The two sides of the front end of the double-end rack are respectively provided with an extending arm, the rear end of the double-end rack is of a double-layer structure consisting of an upper plate and a lower plate, a threaded hole is formed in the middle of the upper plate of the double-end rack, the lower plate is of a rectangular structure with the same size as the rectangular groove on the upper side of the front end of the main body rack, two inserting plates are arranged at the front end of the lower plate, the rear ends of the upper plate and the lower plate are provided with coaxial through round holes, a hand wheel structure is arranged at the upper end of a fifth hand wheel which can be operated by hands and is convenient to rotate, a worm structure is arranged in the middle of the fifth hand wheel, an internal spline is arranged at the lower end of the fifth hand wheel, the fifth hand wheel is arranged in the round holes on the rear ends of the upper plate and the lower plate of the double-end rack, the second worm wheel is arranged between the upper plate and the lower plate of the double-, the left end cover is fastened and connected with the left end of the second worm gear through a screw, the first bevel gear set and the right end cover form a revolute pair, bevel gear structures are arranged at two ends of the first bevel gear set, the bevel gear structure at the left end of the first bevel gear set is meshed with the first planetary bevel gear and the second planetary bevel gear at the same time, the second bevel gear set and the left end cover form a revolute pair, bevel gear structures are arranged at two ends of the second bevel gear set, and the bevel gear structure at the right end of the second bevel gear set is meshed with the first planetary bevel gear and the.

Furthermore, a variable-diameter groove is formed in the cylindrical side surface of the first winding drum, a left thread end penetrating into the variable-diameter groove can be smooth excessively, the width of the variable-diameter groove can only accommodate a single steel wire to penetrate into the variable-diameter groove, a first wrench is installed at a position close to the bottom end of the variable-diameter groove, an eccentric wheel structure is arranged at the lower end of the first wrench, the first wrench is pulled anticlockwise after the left thread end penetrates into the variable-diameter groove and passes through a gap between the eccentric wheel and the variable-diameter groove, the eccentric wheel structure can tightly press the left thread end, a threaded hole is formed in the first winding drum, a first locking knob and the threaded hole form a thread pair, the first winding drum is installed on the left side of the double-thread-end rack, the first winding drum and the double-thread-end rack form a rotating pair, a bevel; the cylinder side of second reel is provided with a variable diameter recess in, can make the excessive rounding and smoothing of right end of a thread that penetrates wherein, variable diameter recess width can only hold single steel wire line and penetrate, install the second spanner in the position that is close to variable diameter recess bottom, the second spanner lower extreme is equipped with the eccentric wheel structure, after right end of a thread penetrates variable diameter recess and passes through the gap between eccentric wheel and the variable diameter recess, clockwise pull the second spanner, can make the eccentric wheel structure compress tightly right end of a thread, be equipped with a screw hole in the second reel, this screw hole of second locking knob constitutes the screw thread pair, the second reel is installed in two end of a thread frame right sides, both constitute the revolute pair, second reel lower extreme is equipped with the bevel gear structure, this bevel gear structure meshes with the bevel gear structure of first bevel gear group right-hand member.

Furthermore, the front end of the screw rod is provided with a disc structure capable of being manually rotated, the rear end of the screw rod is of a threaded structure, the threaded structure is matched with a threaded hole in the middle of the upper plate of the double-thread-head rack to form a threaded pair, the middle of the sliding groove piece is provided with a round hole, the left side and the right side of the sliding groove piece are provided with a long-strip hole, the screw rod is arranged in the round hole in the middle of the sliding groove piece, and the screw rod and the sliding groove piece.

Further, a left connecting rod one end and the left extension arm of the double-thread-head rack form a revolute pair, the other end and the rear end of the left long rod form a revolute pair, one end of a left two connecting rod and the left extension arm of the double-thread-head rack form a revolute pair, the other end and the middle position of the left long rod form a revolute pair, the front end of the left long rod is provided with a left two guide wheel and a left three guide wheel, the rear end of the left long rod is provided with a left guide wheel, the rear end of the left long rod is provided with a protruding shaft extending downwards, and the protruding shaft can slide in a.

Further, right connecting rod one end constitutes the revolute pair with the cantilever arm on double thread end frame right side, the other end constitutes the revolute pair with right stock rear end, two right connecting rod one end constitute the revolute pair with the cantilever arm on double thread end frame right side, the other end constitutes the revolute pair with right stock intermediate position, right stock front end is equipped with two right guide pulleys and three right guide pulleys, right stock rear end is equipped with a right guide pulley, and right stock rear end is equipped with a protrusion axle that stretches out downwards, this protrusion axle can slide in the rectangular trompil on chute spare right side.

Furthermore, the length of the left connecting rod and the right connecting rod is 40mm, the length of the left connecting rod and the right connecting rod is 35mm, the distance between the left end axle center of the left connecting rod and the left end axle center of the left connecting rod is 45mm, the distance between the right end axle center of the left connecting rod and the right end axle center of the left connecting rod is 50mm, the distance between the right end axle center of the right connecting rod and the right end axle center of the right connecting rod is 45mm, the distance between the left end axle center of the right connecting rod and the left end axle center of the right connecting rod is 50mm, and the equilateral quadrangle formed by the parts can enable the left three guide wheels and the right three guide wheels to have a large distance adjusting.

The single-thread-end tightening mechanism comprises a single-thread-end rack, a sixth hand wheel, a third winding drum, a third wrench and a worm gear set, wherein a lead hole is formed in the front end of the single-thread-end rack, the rear end of the single-thread-end rack is of a double-layer structure formed by an upper plate and a lower plate, the lower plate is of a rectangular structure with the same size as a rectangular groove in the upper side of the front end of a main body rack, two inserting plates are arranged at the front end of the lower plate, coaxial and through round holes are formed in the rear ends of the upper plate and the lower plate, the upper end of the sixth hand wheel is of a hand wheel structure, manual operation can be achieved, rotation is facilitated, a worm structure is arranged in the middle of the sixth hand wheel, an internal spline is arranged at the lower end of the lower plate, the sixth hand wheel is arranged in the round holes in the rear ends of the upper plate and the lower plate of the single-thread-end.

Further, be provided with a variable diameter recess in the third reel cylinder side, can make the excessive rounding and smoothing of single line head steel wire that penetrates wherein, variable diameter recess width only can hold single steel wire and penetrate, install the third spanner in the position that is close to variable diameter recess bottom, third spanner lower extreme is equipped with the eccentric wheel structure, after single line head steel wire penetrated variable diameter recess and passed through the gap between eccentric wheel and the variable diameter recess, clockwise pull the third spanner, can make the eccentric wheel structure compress tightly single line head steel wire, the third reel is installed in single line head frame right side, both constitute the revolute pair, third reel lower extreme is equipped with bevel gear structure, this bevel gear structure meshes with the bevel gear structure of worm gear group left end.

The invention has the beneficial effects that:

the invention relates to a handheld medical instrument applied to patella repair, which has two driving modes in the process of tightening a steel wire, wherein one mode is a single-hand operation mode of pulling a middle finger wrench and a trigger in a reciprocating manner; the other is a two-hand operation mode that one hand holds the handle and the other hand rotates the fifth hand wheel or the sixth hand wheel; the two driving modes can be switched randomly according to the actual conditions of the operation and the use habits of medical staff, and the convenience of using the equipment is improved.

The handheld base and the connecting mechanism are in a modularized connecting structure, so that quick connection and disconnection can be realized, the double-wire-head tightening mechanism, the single-wire-head tightening mechanism and the connecting mechanism are also in a modularized connecting structure, so that quick connection and disconnection can be realized, and a large amount of operation time can be saved and the operation efficiency can be improved by modularized quick assembly and disassembly;

the double-wire-end tightening mechanism can tighten the steel wire led out by the double wire ends and can tighten the steel wire led out by the two single wire ends, so that the effect of one machine with multiple purposes is realized, the purchase cost of the medical equipment is reduced, and the development direction of the medical equipment towards high integration is met;

the pressing of the steel wire end in the traditional technology is mostly in a thread pair extrusion mode, the pressing force generated by the thread pair is limited due to the limitation of hand strength of operators, and the steel wire end is easy to separate when the steel wire is tightened with large force; when screwing the thread pair, the steel wire end can be pressed by rotating for a plurality of circles, so that the operation is troublesome and the consumed time is long; the thread pair is easy to wear to cause thread slipping after being used for many times, and the maintenance cost is increased; in the application of the invention, taking the first winding drum as an example, the first winding drum is provided with a groove which can only accommodate a single steel wire to penetrate into a variable diameter groove, and is combined with a first wrench with an eccentric wheel structure to realize the compaction of a steel wire end, and the eccentric wheel compaction has the property of tightening the steel wire end more and more, so that the steel wire end cannot be separated from the first winding drum even if the tightening force of the steel wire is increased after the eccentric wheel structure compacts the steel wire end; the first wrench is only needed to be wrenched left and right to press and loosen the wire end, so that the operation is quick and convenient;

in the equipment for tightening the steel wire in the traditional technology, the ratchet structure is mostly adopted to realize the one-way transmission of power, so that the conditions of less and more over-loosening and over-tightening are easy to occur in the process of tightening the steel wire, and the technical effect of slowly loosening the steel wire under the condition of over-tightening the steel wire is not easy to realize; the double-wire-head tightening mechanism and the single-wire-head tightening mechanism in the application of the invention both adopt worm and gear structures in the power transmission process, have self-locking function, prevent reverse power transmission, have large transmission ratio, can carry out stepless regulation on tightening force, and can realize the tightening and loosening of steel wires through the positive and negative rotation of the worm.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic structural diagram of a handheld base.

Fig. 3 is a schematic cross-sectional view of the handheld base.

Fig. 4 is a schematic cross-sectional view of the handheld base.

Fig. 5 is a partial sectional view of the hand-held base after the middle stop lever is pulled downward and upward.

Fig. 6 is a schematic diagram illustrating a process of driving the central bevel gear to rotate clockwise.

Fig. 7 is an exploded view of the hand-held base.

Fig. 8 is a schematic structural view of the connection mechanism.

Fig. 9 is an exploded view of the attachment mechanism.

Fig. 10 is a schematic view of a partial cross-sectional structure of the connection mechanism being connected and disconnected with the top plate and the double-thread-head frame.

Fig. 11 is a schematic structural view of a double-thread-head tightening mechanism.

Fig. 12 is a schematic cross-sectional view of a double thread take-up mechanism.

Fig. 13 is a schematic longitudinal sectional view of the double wire head tightening mechanism.

Fig. 14 is an exploded view of the dual thread take-up mechanism.

Fig. 15 is a schematic structural diagram of a double-lead frame.

Fig. 16 is a partial sectional view schematically showing the structure of the first reel.

Fig. 17 is a schematic view of the double-end wire take-up mechanism taking up the double-end wire.

Fig. 18 is a partial cross-sectional schematic view of a single-lead take-up mechanism.

FIG. 19 is a schematic view of a single thread take-up mechanism taking up a single thread of wire.

Reference numerals: 1 hand-held base, 101 base, 101.1 handle, 101.2 right support plate, 101.3 left support plate, 102 top plate, 102.1 plug-in column, 102.2 bevel gear rack, 103 lifting shaft, 104 left stop lever, 105 middle stop lever, 106 right stop lever, 107 sliding table spring, 108 rack, 108.1 right bevel rack, 108.2 left bevel rack, 109 lifting frame, 110 central bevel gear, 111 left connecting rod, 112 left gear set, 113 left swinging piece, 114 left bevel top, 115 first spring, 116 arc groove swinging plate, 117 right bevel top, 118 right swinging piece, 119 right gear set, 120 right connecting rod, 121 sliding table, 121.1 middle finger, 122 parallel rod, 123 trigger spring, 124 trigger, 125 right swinging spring, 126 right rotating sleeve, 127 left rotating sleeve, 128 left swinging spring;

2, a connecting mechanism, a 201 main body frame, 201.1 jacks, a 202 bottom plate, a 203 clamping plate, 204 set screws, 205 buttons, 206 second springs, 207 third springs and 208 hooks;

3 double-thread-end tightening mechanism, 301 double-thread-end frame, 301.1 spile, 302 fifth hand wheel, 303 first wrench, 304 first reel, 305 first locking knob, 306 left guide wheel, 307 left connecting rod, 308 sliding groove component, 309 screw rod, 310 left connecting rod, 311 left long rod, 312 left guide wheel, 313 left three guide wheel, 314 right three guide wheel, 315 right two guide wheel, 316 right long rod, 317 right connecting rod, 318 right connecting rod, 319 right guide wheel, 320 second locking knob, 321 second reel, 322 second wrench, 323 first bevel gear set, 324 right end cap, 325 second worm gear, 326 first planetary bevel gear, 327 left end cap, 328 second bevel gear set, 329 second planetary bevel gear;

4 single-thread-end tightening mechanism, 401 single-thread-end rack, 402 sixth hand wheel, 403 third winding drum, 404 third wrench, 405 worm gear set;

5 single thread steel wire, 6 double thread steel wire, 6.1 left thread end and 6.2 right thread end.

Detailed Description

The present invention will be further described with reference to specific examples, which are illustrative of the invention and are not to be construed as limiting the invention.

As shown in fig. 1 and 2, a handheld medical device applied to patellar repair comprises a handheld base 1, a connecting mechanism 2, a double-wire-head tightening mechanism 3 and a single-wire-head tightening mechanism 4, and is characterized in that: handheld base 1 can realize high-speed joint and the release with coupling mechanism 2, double-thread tightening mechanism 3, also adopt modular connection structure between single-thread tightening mechanism 4 and the coupling mechanism 2, all can realize high-speed joint and release, handheld base 1 can supply medical personnel to carry out handheld operation, and fix a position and adjust the gesture to double-thread tightening mechanism 3 and single-thread tightening mechanism 4, and can provide drive power for double-thread tightening mechanism 3 and single-thread tightening mechanism 4 tighten up the steel wire, double-thread tightening mechanism 3 can tighten up the steel wire that two double-thread heads were drawn forth and the steel wire that two single-thread heads were drawn forth, single-thread head tightening mechanism 4 can tighten up the steel wire that a single-thread head was drawn forth.

As shown in fig. 3, 4 and 7, the handheld medical device for patella repair is characterized in that: the handheld base 1 comprises a base 101, a top plate 102, a lifting shaft 103, a left stop lever 104, a middle stop lever 105, a right stop lever 106, a sliding table spring 107, a rack 108, a lifting frame 109, a central bevel gear 110, a left connecting rod 111, a left gear set 112, a left swinging piece 113, a left conical top 114, a first spring 115, an arc groove swinging plate 116, a right conical top 117, a right swinging piece 118, a right gear set 119, a right connecting rod 120, a sliding table 121, a parallel rod 122, a trigger spring 123, a trigger 124, a right swinging spring 125, a right rotating sleeve 126, a left rotating sleeve 127 and a left swinging spring 128, wherein the top plate 102 and the base 101 provide support for the movement of the above components, the central bevel gear 110 and the top plate 102 form a rotating pair, the lifting shaft 103 and the central bevel gear 110 are connected through splines and form a moving pair, the left gear set 112 and the gear set 119 can both rotate and move up and down relative to the base 101, and the left, The left cone top 114, the left swinging piece 113 and the left rotating sleeve 127 realize the up-and-down movement and positioning of the left gear set 112, the right stop lever 106 realizes the up-and-down movement and positioning of the right gear set 119 through the right swinging spring 125, the right cone top 117, the right swinging piece 118 and the right rotating sleeve 126, the middle stop lever 105 realizes the up-and-down movement and positioning of the lifting shaft 103 through the first spring 115, the arc groove swinging plate 116, the left connecting rod 111, the right connecting rod 120 and the lifting frame 109, the reciprocating action of the sliding table 121 and the trigger 124 realizes the reciprocating engagement and disengagement of the rack 108 and the left gear set 112 or the right gear set 119 through the sliding table spring 107, the parallel rod 122 and the trigger spring 123, thereby realizing the forward rotation or the reverse rotation of the lifting shaft 103 through the engagement of the left gear set 112 or the right gear set 119 and the central bevel gear 110, and realizing the tightening or loosening of the steel wire.

As shown in fig. 3, 4 and 5, the upper end of the base 101 is a square cavity, the lower end of the base is provided with a handle 101.1, two sides of the interior of the square cavity are provided with a left support plate 101.3 and a right support plate 101.2, the front end of the bottom of the square cavity is provided with a square empty slot, two sides of the empty slot are provided with guide rail structures, a left gear set 112 is installed in a circular hole at the end part of the left support plate 101.3 and can rotate and move up and down relative to the left support plate 101.3, a right gear set 119 is installed in a circular hole at the end part of the right support plate 101.2 and can rotate and move up and down relative to the right support plate 101.2, the top plate 102 is fixedly connected with the upper end of the base 101 through screws, the upper side of the top plate 102 is provided with four insertion columns 102.1, the top end of each insertion column 102.1 is provided with an inclined surface, the middle position is provided with a hook, the top plate 102, the lifting mechanism comprises a rotating pair, an internal spline is arranged at the upper end of the center of a central bevel gear 110, the upper end and the lower end of a lifting shaft 103 are both in an external spline structure, the lifting shaft 103 can rotate and move up and down in a round hole of a top plate 102 close to the middle position, the external spline at the lower end of the lifting shaft 103 is matched and installed with the internal spline at the upper end of the central bevel gear 110 and can move up and down in the internal spline without separation, and the round hole arranged at the center of a lifting frame 109 is coaxially installed with the lifting shaft 103 and.

As shown in fig. 3, 4 and 6, the left gear set 112 is provided with an upper bevel gear structure and a lower bevel gear structure, the left rotating sleeve 127 is mounted on the top end of the left gear set 112, the two structures form a rotating pair and can drive the left gear set 112 to move up and down, the left end of the left swinging member 113 is a planar structure, the right end is provided with a long slot opening, the middle position and the top plate 102 form a rotating pair, the two ends of the left rotating sleeve 127 are provided with extending shafts which can slide in the long slot opening at the right end of the left swinging member 113, the middle position of the left stop lever 104 and the top plate 102 form a rotating pair, the rotating shaft center and the rotating shaft center of the left swinging member 113 are at the same horizontal height, the left end of the left stop lever 104 is a plate-shaped structure which is convenient to be pulled up and down, a left swinging spring 128 and a left cone top 114 are mounted in a circular hole at the right end, and the left swinging spring, and can slide on the plane structure; the right gear set 119 is provided with an upper bevel gear structure and a lower bevel gear structure, a right rotating sleeve 126 is arranged at the top end of the right gear set 119, the two structures form a rotating pair, and can drive the right gear set 119 to move up and down, the left end of the right swinging member 118 is of a plane structure, the right end is provided with a long groove opening, the middle position forms a rotating pair with the top plate 102, the extending shafts arranged at the two ends of the right rotating sleeve 126 can slide in the long groove opening at the right end of the right swinging member 118, the middle position of the right stop lever 106 forms a rotating pair with the top plate 102, and the rotation axis is at the same level with the rotation axis of the right swinging piece 118, the left end of the right blocking rod 106 is a plate-shaped structure convenient for pulling up and down, a right swinging spring 125 and a right conical top 117 are arranged in a circular hole at the right end, and the right pendulum spring 125 is always in a compressed state, the conical tip at the right end of the right conical tip 117 abuts against the planar structure at the left end of the right pendulum 118 and can slide on the planar structure;

in an initial state, the left stop lever 104 is in an upward pulling state, the left swing spring 128 pushes the right end of the left cone top 114 to tightly abut against the lower edge of the left end planar structure of the left swinging member 113, and due to the lever effect, the long groove opening at the right end of the left swinging member 113 lifts the left rotating sleeve 127 to a high position, so that the left gear set 112 moves upwards to the high position, and the upper bevel gear structure of the left gear set 112 is disengaged from the central bevel gear 110; the right stop lever 106 is in an upward pulling state, the right swing spring 125 pushes the right end of the right cone top 117 to tightly prop against the lower edge of the left end planar structure of the right swing member 118, and due to the lever action, the long groove opening at the right end of the right swing member 118 lifts the right rotating sleeve 126 to a high position, so that the right gear set 119 moves upwards to the high position, and the upper bevel gear structure of the right gear set 119 is disengaged from the central bevel gear 110; that is, in the initial state, the left lever 104 and the right lever 106 are both pulled upward, and the left gear set 112 and the right gear set 119 are both in the high position disengaged from the central bevel gear 110;

when the left stop lever 104 is pulled counterclockwise downward, the left swing spring 128 pushes the right end of the left conical top 114 to slide from the lower edge to the upper edge of the left end planar structure of the left swing member 113, in the process, the left swing spring 128 is compressed and then extended, the left swing member 113 rotates clockwise, so that the left gear set 112 moves downward to the low position, and the upper bevel gear structure of the left gear set 112 is meshed with the central bevel gear 110; when the left stop lever 104 is pulled up clockwise, the left gear set 112 moves up to a high position and is disengaged from the central bevel gear 110;

when the right stop lever 106 is pulled down counterclockwise, the right swing spring 125 pushes the right end of the right cone top 117 to slide from the lower edge to the upper edge of the left end planar structure of the right swing member 118, in the process, the right swing spring 125 is compressed and then extends, the right swing member 118 rotates clockwise, so that the right gear set 119 moves down to the low position, and the upper bevel gear structure of the right gear set 119 is meshed with the central bevel gear 110; by pulling the right lever 106 clockwise upward, the right gear set 119 moves upward to the high position out of engagement with the central bevel gear 110.

As shown in fig. 5, the left ends of the left connecting rod 111 and the right connecting rod 120 and the top plate 102 form a coaxial revolute pair, the right ends are provided with long hollow grooves, the extending shafts arranged at the two ends of the lifting frame 109 respectively slide in the long hollow grooves at the right ends of the left connecting rod 111 and the right connecting rod 120, the middle position of the arc groove swinging plate 116 and the top plate 102 form a revolute pair, the rotation axis of the revolute pair is coaxial with the rotation axis of the left connecting rod 111 and the right connecting rod 120, the left end of the arc groove swinging plate 116 is provided with a cross rod, the right end of the arc groove swinging plate 116 is provided with an arc hollow groove, the extending shaft arranged at the outer side of the middle position of the left connecting rod 111 and the right connecting rod 120 slides in the arc hollow groove at the right end of the arc groove swinging plate 116, the middle position of the middle blocking rod 105 and the base 101 form a revolute pair, the left end of the middle blocking rod 105 is of a plate-shaped structure convenient for pulling up and down, the right end is, the first spring 115 is always in a stretched state, and the axis of the right end mounting position thereof and the rotation axis of the middle stop lever 105 are at the same horizontal height;

in an initial state, the middle stop lever 105 is pulled downwards, the first spring 115 tensions the cross rod at the left end of the arc groove swinging plate 116 to enable the cross rod to have a tendency of clockwise rotation, the upper end of the arc empty groove at the right end of the arc groove swinging plate 116 tightly supports the extending shafts of the left connecting rod 111 and the right connecting rod 120 downwards, the latter two have a tendency of clockwise rotation, and the lifting frame 109 drives the lifting shaft 103 to be at a low position;

the middle stop lever 105 is pulled upwards clockwise, in the process, the first spring 115 extends firstly and then shortens, the arc groove swinging plate 116 rotates anticlockwise, the lower end of the arc empty groove at the right end of the arc groove swinging plate 116 tightly props up the extending shafts of the left connecting rod 111 and the right connecting rod 120 upwards, so that the left connecting rod 111 and the right connecting rod 120 rotate anticlockwise, and the lifting frame 109 drives the lifting shaft 103 to move upwards to a high position, so that the lifting shaft 103 extends upwards; when the middle stop lever 105 is pulled downwards counterclockwise, the lifting frame 109 drives the lifting shaft 103 to move downwards to a low position, and the lifting shaft 103 retracts downwards.

As shown in fig. 5 and 6, the sliding table 121 is installed in a square hollow groove at the front end of the bottom of the square cavity of the base 101 to form a sliding pair, a sliding table spring 107 is arranged between the top end of the sliding table 121 and the front side of the square cavity of the base 101, a middle finger wrench 121.1 is arranged at the lower end of the sliding table 121, a left conical rack 108.2 and a right conical rack 108.1 are arranged at two sides of the rear end of the rack, a parallel rod 122, the rack 108 and the sliding table 121 form a rotating pair, the upper end of a trigger 124, the rack 108 and the sliding table 121 form a rotating pair, the rack 108, the sliding table 121, the parallel rod 122 and the trigger 124 form a parallelogram structure, a trigger spring 123 is arranged between the middle position of the parallel rod 122;

in an initial state, under the action of the contraction and pulling force of a sliding table spring 107, the sliding table is positioned at the front end of the square cavity of the base 101, under the action of the contraction and pulling force of a trigger spring 123, a trigger 124 is in a forward extending state, and a rack 108 is in a low position;

if the central bevel gear 110 needs to rotate clockwise, the left stop lever 104 is pulled upwards to enable the left gear set 112 to be in a high position and to be disengaged from the central bevel gear 110, the right stop lever 106 is pulled downwards to enable the right gear set 119 to be in a low position, and the upper bevel gear structure of the right gear set 119 is engaged with the central bevel gear 110; the palm holds the handle, so that the thumb, the ring finger and the little finger hold the handle, the middle finger hooks the middle finger wrench 121.1, and the forefinger hooks the trigger 124; firstly, the forefinger pulls the trigger 124 backwards to enable the trigger 124 to rotate clockwise, due to the structural characteristics of the parallelogram, the rack 108 moves upwards to the height meshed with the lower bevel gear structure of the right gear set 119, then the forefinger and the middle finger pull the middle finger wrench 121.1 and the trigger 124 backwards together to enable the rack 108 to be kept at the high position and move backwards, the right bevel rack 108.1 is meshed with the lower bevel gear structure of the right gear set 119, and the right gear set 119 rotates anticlockwise, so that the clockwise rotation of the central bevel gear 110 is realized; when the sliding table 121 moves to the rearmost end of the square empty groove of the base 101, the forefinger firstly loosens the trigger 124 to enable the sliding table to rotate forwards, the rack 108 descends to the low position under the action of the tensile force of the trigger spring 123 and is disengaged from the bevel gear structure below the right gear set 119, then the middle finger wrench 121.1 is loosened forwards, and the sliding table 121 moves forwards to the initial position under the action of the tensile force of the sliding table spring 107; the clockwise continuous rotation of the central bevel gear 110 can be realized by repeating the above steps;

if the central bevel gear 110 needs to rotate anticlockwise, the left stop lever 104 is pulled downwards to enable the left gear set 112 to be at a low position, the upper bevel gear structure of the left gear set 112 is meshed with the central bevel gear 110, and the right stop lever 106 is pulled upwards to enable the right gear set 119 to be at a high position and to be disengaged from the central bevel gear 110; the palm holds the handle, so that the thumb, the ring finger and the little finger hold the handle, the middle finger hooks the middle finger wrench 121.1, and the forefinger hooks the trigger 124; firstly, the forefinger pulls the trigger 124 backwards to enable the trigger 124 to rotate clockwise, the rack 108 moves upwards to the height meshed with the lower bevel gear structure of the left gear set 112 due to the structural characteristic of the parallelogram, then the forefinger and the middle finger pull the middle finger wrench 121.1 and the trigger 124 backwards together to enable the rack 108 to be kept at the high position and move backwards, the left bevel rack 108.2 is meshed with the lower bevel gear structure of the left gear set 112, and the left gear set 112 rotates clockwise, so that the counterclockwise rotation of the central bevel gear 110 is realized; when the sliding table 121 moves to the rearmost end of the square empty groove of the base 101, the forefinger firstly loosens the trigger 124 to enable the sliding table to rotate forwards, the rack 108 descends to the low position under the action of the tensile force of the trigger spring 123 and is disengaged from the bevel gear structure below the right gear set 119, then the middle finger wrench 121.1 is loosened forwards, and the sliding table 121 moves forwards to the initial position under the action of the tensile force of the sliding table spring 107; the counter-clockwise continuous rotation of the central bevel gear 110 can be realized by repeating the above steps;

as shown in fig. 8 and 9, the connecting mechanism 2 includes a main body frame 201, a bottom plate 202, a clamping plate 203, a set screw 204, a button 205, a second spring 206, a third spring 207, and a hook 208, wherein a rectangular groove is provided on the upper side of the front end of the main body frame 201, two rectangular insertion holes 201.1 are provided on the front end of the rectangular groove, a through hole is provided near the middle position of the rectangular groove, a hook cavity and a button hole in the vertical direction are provided inside the rear end of the main body frame 201, the hook 208 is installed in the hook cavity and can slide back and forth in the hook cavity, an inclined plane structure is provided on the front end of the hook 208, a rectangular opening is provided on the middle position, an inclined plane is provided on the rear side of the button 205, the button 205 passes through the rectangular opening in the middle of the hook 208 and is installed in the button hole of the main body frame 201, two threaded holes communicated with the hook cavity, two third springs 207 set up respectively between two holding screw 204 and couple 208, main part frame 201 downside is equipped with the cardboard cavity, cardboard 203 is installed in the cardboard cavity, and can be in the cardboard cavity back-and-forth movement, be equipped with four horseshoe trompils on the cardboard, cardboard 203 rear end is equipped with a pressure board, the intermediate position is equipped with the rectangle trompil, be provided with a second spring 206 between cardboard 203 front end position and the main part frame 201, be equipped with four round holes that are used for inserting peg post 102.1 on the bottom plate 202, bottom plate 202 installs in main part frame 201 downside, and realize fastening connection between them through the screw, round hole coaxial center position is equipped with the through-hole in the middle of the rectangular recess with main part frame 201 in the middle of bottom.

As shown in fig. 10, in the initial state, under the action of the elastic force of the third spring 207, the hook 208 is located at the front end of the hook cavity, the inclined surface structure at the front end of the hook 208 extends into the rectangular groove at the upper side of the front end of the main body frame 201, the button 205 is pressed downwards, and the inclined surface at the rear side pushes the hook 208 to move backwards, so that the inclined surface structure at the front end of the hook 208 retracts into the hook cavity; after releasing the pressing of the button 205, the hook 208 is restored to the original position by the elastic force of the third spring 207.

As shown in fig. 10, under the action of the elastic force of the second spring 206, the clamping plate 203 is located at the rear end of the clamping plate cavity, after the four insertion columns 102.1 arranged on the top plate 102 are inserted into the four round holes arranged on the bottom plate 202, under the action of the inclined planes at the top ends of the insertion columns 102.1 and the second spring 206, the clamping plate 203 slides forwards and rebounds backwards, the straight edges of the four horseshoe-shaped openings on the clamping plate 203 are clamped into the hooks at the middle positions of the four insertion columns 102.1, and thus the quick connection of the connecting mechanism 2 and the handheld base 1 is realized; pressing the pressing plate of cardboard 203 rear end, making and pressing cardboard 203 and move forward, the straight line limit of four horseshoe trompils breaks away from the back in the couple of four plug post 102.1 intermediate positions, takes away coupling mechanism 2 upwards away, can realize coupling mechanism 2 and handheld base 1's quick release.

The set screw 204 and the main body frame 201 form a thread pair connection, and the pressing and resilience of the button 205 can be adjusted by adjusting the pre-tightening elastic force of the third spring 207.

As shown in fig. 11, 12, 13, 14, and 15, the double wire-head tightening mechanism 3 includes a double wire-head frame 301, a fifth hand wheel 302, a first wrench 303, a first reel 304, a first locking knob 305, a left guide wheel 306, a left connecting rod 307, a chute member 308, a screw 309, a left connecting rod 310, a left long rod 311, a left guide wheel 312, a left guide wheel 313, a right guide wheel 314, a right guide wheel 315, a right long rod 316, a right connecting rod 317, a right connecting rod 318, a right guide wheel 319, a second locking knob 320, a second reel 321, a second wrench 322, a first bevel gear set 323, a right end cover 324, a second worm wheel 325, a first planetary bevel gear 326, a left end cover 327, a second bevel gear set 328, a second planetary bevel gear 329, a left connecting rod 307, a left connecting rod 310, and a left long rod 311, wherein the double wire-head tightening mechanism 3 includes a double wire-head frame 301, a fifth hand wheel 302, a first wrench 303, a first reel 304, a first locking, The right two connecting rods 317 and the right long rod 316 are arranged at the right front end of the double-thread end rack 301 and form a trapezoid, the sliding groove member 308 and the screw 309 are arranged at the middle position of the front end of the double-thread end rack 301, for adjusting the opening position of the left long rod 311 and the right long rod 316, the first wrench 303, the first winding drum 304 and the first locking knob 305 are arranged at the left side of the double-thread-head rack 301, used for tightening the left wire end 6.1 or a first steel wire, a second locking knob 320, a second winding drum 321 and a second wrench 322 are arranged at the right side of the double-wire-end rack 301, the fifth hand wheel 302 is used for tightening the right thread head 6.2 or the second steel wire, and the fifth hand wheel drives the first winding drum 304 and the second winding drum 321 to rotate through a transmission structure consisting of a first bevel gear group 323, a right end cover 324, a second worm gear 325, a first planetary bevel gear 326, a left end cover 327, a second bevel gear group 328 and a second planetary bevel gear 329, so that tightening and loosening of the steel wire led out by the double thread head or the steel wire led out by the two single thread heads are realized.

The two sides of the front end of the double-line-head rack 301 are respectively provided with an extending arm, the rear end of the double-line-head rack 301 is of a double-layer structure formed by an upper plate and a lower plate, the middle position of the upper plate of the double-line-head rack 301 is provided with a threaded hole, the lower plate is of a rectangular structure with the same size as the rectangular groove on the upper side of the front end of the main body frame 201, the front end of the lower plate is provided with two plug plates 301.1, the rear ends of the upper plate and the lower plate are provided with coaxial and through round holes, the upper end of a fifth hand wheel 302 is of a hand wheel structure which can be operated by hands and is convenient to rotate, the middle part of the fifth hand wheel is of a worm structure, the lower end of the fifth hand wheel 302 is arranged in the round holes on the rear ends of the upper plate and the lower plate of the double-line-head rack 301, the second worm wheel 325 is arranged between the upper plate, the right end cover 324 is fastened and connected with the right end of the second worm gear 325 through a screw, the left end cover 327 is fastened and connected with the left end of the second worm gear 325 through a screw, the first bevel gear set 323 and the right end cover 324 form a rotating pair, both ends of the first bevel gear set 323 are provided with bevel gear structures, the bevel gear structure at the left end is simultaneously meshed with the first planetary bevel gear 326 and the second planetary bevel gear 329, the second bevel gear set 328 and the left end cover 327 form a rotating pair, both ends of the second bevel gear set 328 are provided with bevel gear structures, and the bevel gear structure at the right end is simultaneously meshed with the first planetary bevel gear 326 and the second planetary bevel gear 329.

As shown in fig. 16 and 17, a variable diameter groove is formed in a cylindrical side surface of the first reel 304, so that a left thread end 6.1 penetrating therethrough is excessively smooth, the width of the variable diameter groove can only accommodate a single steel wire to penetrate therethrough, a first wrench 303 is installed at a position close to the bottom end of the variable diameter groove, an eccentric wheel structure is arranged at the lower end of the first wrench 303, after the left thread end 6.1 penetrates into the variable diameter groove and passes through a gap between the eccentric wheel and the variable diameter groove, the first wrench 303 is pulled counterclockwise, so that the eccentric wheel structure can be pressed against the left thread end 6.1, a threaded hole is formed in the first reel 304, a first locking knob 305 and the threaded hole form a thread pair, the first reel 304 is installed at the left side of the double thread end rack 301, both form a rotation pair, a bevel gear structure is arranged at the lower end of the first reel 304, and the bevel gear structure is engaged with a bevel; a variable diameter groove is arranged in the cylindrical side surface of the second winding drum 321, a right thread end 6.2 which penetrates into the variable diameter groove is excessively smooth, the width of the variable diameter groove can only accommodate a single steel wire to penetrate into the variable diameter groove, a second wrench 322 is arranged at a position close to the bottom end of the variable diameter groove, an eccentric wheel structure is arranged at the lower end of the second wrench 322, after the right thread end 6.2 penetrates into the variable diameter groove and passes through a gap between the eccentric wheel and the variable diameter groove, the second wrench 322 is pulled clockwise, the eccentric wheel structure can be tightly pressed against the right thread end 6.2, a threaded hole is arranged in the second winding drum 321, the threaded hole of the second locking knob 320 forms a thread pair, the second winding drum 321 is arranged on the right side of the double-thread-end frame 301, the second winding drum 321 and the double-thread-end frame constitute a rotating pair, a bevel gear structure.

As shown in fig. 11 and 13, the front end of the screw 309 is provided with a manually rotatable disk structure, the rear end of the screw is provided with a thread structure, the thread structure is matched and installed with a threaded hole at the middle position of the upper plate of the double-thread-head rack 301 to form a thread pair, the middle position of the chute member 308 is provided with a round hole, the left side and the right side are provided with a long-strip opening, and the screw 309 is installed in the round hole at the middle position of the chute member 308 to form a rotation pair.

As shown in fig. 11, one end of the left connecting rod 307 and the left extending arm of the two-string head frame 301 form a rotation pair, the other end and the rear end of the left long rod 311 form a rotation pair, one end of the left connecting rod 310 and the left extending arm of the two-string head frame 301 form a rotation pair, the other end and the middle position of the left long rod 311 form a rotation pair, the front end of the left long rod 311 is provided with a left second guide wheel 312 and a left third guide wheel 313, the rear end of the left long rod 311 is provided with a left first guide wheel 306, and the rear end of the left long rod 311 is provided with a projecting shaft extending downwards, which can slide in the long strip opening on the left.

As shown in fig. 11, one end of the right connecting rod 318 and the extending arm on the right side of the two-string head frame 301 form a rotation pair, the other end and the rear end of the right long rod 316 form a rotation pair, one end of the right connecting rod 317 and the extending arm on the right side of the two-string head frame 301 form a rotation pair, the other end and the middle position of the right long rod 316 form a rotation pair, the front end of the right long rod 316 is provided with a right two guide wheel 315 and a right three guide wheel 314, the rear end of the right long rod 316 is provided with a right one guide wheel 319, and the rear end of the right long rod 316 is provided with a projecting shaft extending downwards, which can slide in the.

As shown in fig. 11 and 17, the length of the left connecting rod 307 and the right connecting rod 318 is 40mm, the length of the left connecting rod 310 and the right connecting rod 317 is 35mm, the distance between the left end axis of the left connecting rod 307 and the left end axis of the left connecting rod 310 is 45mm, the distance between the right end axis of the left connecting rod 307 and the right end axis of the left connecting rod 310 is 50mm, the distance between the right end axis of the right connecting rod 318 and the right end axis of the right connecting rod 317 is 45mm, and the distance between the left end axis of the right connecting rod 318 and the left end axis of the right connecting rod 317 is 50 mm.

As shown in fig. 11 and 17, in an initial state, the screw 309 is retracted into the threaded hole at the middle position of the upper plate of the double thread end machine frame 301, the distance between the left three guide wheels 313 and the right three guide wheels 314 is the closest, when the screw 309 is screwed out of the threaded hole, the slide groove member 308 moves forward, so that the left long rod 311 and the right long rod 316 move forward, in the process, due to the action of a quadrangle with a specific side length formed by the left extending arm, the left connecting rod 307, the left two connecting rod 310, the left long rod 311, the right extending arm of the double thread end machine frame 301, the right connecting rod 318, the right two connecting rod 317 and the right long rod 316, the front ends of the left long rod 311 and the right long rod 316 are expanded, and the left three guide wheels 313 and the right three guide wheels 314 can be adjusted to a distance required; after the screw 309 is screwed into the threaded hole, the components return to the initial state.

As shown in fig. 18 and 19, the single-thread-head tightening mechanism 4 includes a single-thread-head frame 401, a sixth handwheel 402, a third winding drum 403, a third wrench 404, and a worm gear group 405, wherein the single-thread-head frame 401 has a lead hole at the front end, the rear end is a double-layer structure formed by an upper plate and a lower plate, the lower plate is a rectangular structure having the same size as the rectangular groove at the upper side of the front end of the main body frame 201, the front end of the lower plate is provided with two insertion plates, the rear ends of the upper plate and the lower plate are provided with coaxial and through circular holes, the upper end of the sixth handwheel 402 is a handwheel structure for manual operation and convenient rotation, the middle is a worm structure, the lower end is provided with an internal spline, the sixth handwheel 402 is installed in the circular holes at the rear ends of the upper plate and the lower plate at the rear end of the single-thread-head frame 401, the worm gear group 405 is installed between, which meshes with a worm structure in the middle of the sixth handwheel 402.

As shown in fig. 18 and 19, a variable diameter groove is formed in a cylindrical side surface of the third winding drum 403, the single-start steel wire 5 penetrating into the variable diameter groove can be smooth, the variable diameter groove can only accommodate the single steel wire to penetrate, a third wrench 404 is installed at a position close to the bottom end of the variable diameter groove, an eccentric wheel structure is arranged at the lower end of the third wrench 404, the single-start steel wire 5 penetrates into the variable diameter groove and passes through a gap between the eccentric wheel and the variable diameter groove, the third wrench 404 is pulled clockwise to enable the eccentric wheel structure to press the single-start steel wire 5, the third winding drum 403 is installed at the right side of the single-start rack 401, the third winding drum 403 and the single-start rack form a rotating pair, a bevel gear structure is arranged at the lower end of the third winding drum 403, and the bevel gear structure is.

The embodiment of the invention comprises the following steps:

1) as shown in fig. 1, the handheld base 1 can provide a driving force for supporting and tightening a steel wire for the double-wire-head tensioning mechanism 3 and the single-wire-head tensioning mechanism 4 through the connecting mechanism 2, and is mainly applied to a steel wire tightening operation with short time consumption; in the process of tightening the steel wire, two driving modes are provided, one is a single-hand operation mode by pulling the middle finger wrench and the trigger to and fro; the other is a two-hand operation mode that one hand holds the handle and the other hand rotates the fifth hand wheel or the sixth hand wheel; the two driving modes can be switched randomly according to the actual condition of the operation and the use habits of medical staff;

one-handed operation mode: as shown in fig. 5, taking the double-wire-head tensioning mechanism 3 as an example, after the handheld base 1 is spliced with the double-wire-head tensioning mechanism 3 through the connecting mechanism 2, the middle stop lever 105 is pulled upwards to extend the lifting shaft 103 upwards, and the external spline at the upper end of the lifting shaft 103 passes through the connecting mechanism 2 to be meshed with the internal spline at the lower end of the fifth hand wheel 302; the left stop lever 104 is pulled upwards to enable the left gear set 112 to be disengaged from the central bevel gear 110, the right stop lever 106 is pulled downwards to enable the upper bevel gear structure of the right gear set 119 to be engaged with the central bevel gear 110, the middle wrench and the trigger are pulled in a reciprocating manner to enable the right bevel rack 108.1 to continuously push the right gear set 119 to rotate anticlockwise, so that the central bevel gear 110 rotates clockwise, the central bevel gear 110 drives the fifth hand wheel 302 to rotate clockwise through the lifting shaft 103, and therefore the double-end steel wire 6 or the two single-end steel wires can be tightened; the middle stop lever 105 is pulled upwards, the left stop lever 104 is pulled downwards, the upper bevel gear structure of the left gear set 112 is meshed with the central bevel gear 110, the right stop lever 106 is pulled upwards, the right gear set 119 is disengaged from the central bevel gear 110, the middle wrench and the trigger are pulled in a reciprocating manner, the left bevel rack 108.2 continuously pushes the left gear set 112 to rotate clockwise, the central bevel gear 110 rotates anticlockwise, the central bevel gear 110 drives the fifth hand wheel 302 to rotate anticlockwise through the lifting shaft 103, and accordingly double-end steel wires 6 or two single-end steel wires are loosened;

two-hand operation mode: as shown in fig. 5, taking the double-thread tensioning mechanism 3 as an example, after the handheld base 1 is spliced with the double-thread tensioning mechanism 3 through the connecting mechanism 2, the middle stop lever 105 is pulled downwards to make the lifting shaft 103 retract downwards, and the external spline at the upper end of the lifting shaft 103 is disengaged from the internal spline at the lower end of the fifth hand wheel 302; the handle 101.1 is held by one hand, and the fifth hand wheel 302 is clockwise rotated by the other hand to tighten the double-thread steel wire 6 or the two single-thread steel wires; and the fifth hand wheel 302 is rotated anticlockwise to loosen the double-end steel wire 6 or the two single-end steel wires.

2) As shown in fig. 10, when the connection mechanism 2 needs to be connected to the handheld base 1, the four insertion posts 102.1 on the top plate 102 only need to be inserted into the four circular holes formed on the bottom plate 202, and after the straight edges of the four horseshoe-shaped openings on the clamping plate 203 are clamped into the hooks at the middle positions of the four insertion posts 102.1, the connection mechanism 2 is quickly connected to the handheld base 1; when the connection between the connecting mechanism 2 and the handheld base 1 needs to be released, the pressing plate at the rear end of the clamping plate 203 only needs to be pressed, the straight edges of the four horseshoe-shaped openings are separated from the hooks at the middle positions of the four insertion columns 102.1, the connecting mechanism 2 is taken away upwards, and the quick release between the connecting mechanism 2 and the handheld base 1 can be realized.

As shown in fig. 10, when the dual-stub tightening mechanism 3 needs to be connected to the connecting mechanism 2, first, the two insertion plates 301.1 at the front end of the lower plate of the dual-stub frame 301 are correspondingly inserted into the two rectangular insertion holes 201.1 at the front end of the rectangular groove on the upper side of the main frame 201, and then the rear end of the dual-stub frame 301 is pressed downward, so that the rear end of the lower plate of the dual-stub frame 301 is pressed into the lower part of the inclined plane structure at the front end of the hook 208, and then the rapid connection between the dual-stub tightening mechanism 3 and the connecting mechanism 2 is completed; when the double-thread-end tightening mechanism 3 needs to be disconnected with the connecting mechanism 2, the button 205 is pressed downwards at first to enable the inclined plane structure at the front end of the hook 208 to retract into the hook cavity, then the rear end of the double-thread-end rack 301 is lifted upwards and the inserting plate 301.1 is pulled out of the inserting hole 201.1, and then the double-thread-end tightening mechanism 3 and the connecting mechanism 2 can be quickly disconnected; the manner and method of connecting and disconnecting the single thread take-up mechanism 4 to the connecting mechanism 2 is the same as the manner and method of connecting and disconnecting the double thread take-up mechanism 3 to the connecting mechanism 2.

3) As shown in fig. 11, 16, and 17, the double-thread tightening mechanism 3 can tighten the wire drawn from the double-thread wire and the wire drawn from the two single-thread wires.

Firstly, when the double-end steel wire 6 needs to be tightened, the screw 309 is screwed out from the threaded hole in the middle of the upper plate of the double-end machine frame 301, the screw 309 drives the sliding groove piece 308 to move forwards, meanwhile, the front ends of the left long rod 311 and the right long rod 316 are opened, and the screw 309 stops rotating after the left three guide wheels 313 and the right three guide wheels 314 reach a proper distance; then, the double-end steel wire 6 sequentially passes through the steel nails and is wound into a single ring shape, the left end 6.1 sequentially bypasses a left third guide wheel 313, a left second guide wheel 312 and a left first guide wheel 306, then penetrates into a variable-diameter groove arranged on the first reel 304 and passes through a gap between the eccentric wheel structure of the first wrench 303 and the variable-diameter groove, and then the first wrench 303 is pulled anticlockwise, so that the eccentric wheel structure of the first wrench 303 tightly presses the left end 6.1; the right thread end 6.2 sequentially bypasses the right three guide wheel 314, the right two guide wheel 315 and the right one guide wheel 319, penetrates into a diameter-variable groove arranged on the second winding drum 321, passes through a gap between the eccentric wheel structure of the second wrench 322 and the diameter-variable groove, and then is pulled clockwise by the second wrench 322, so that the eccentric wheel structure of the second wrench 322 compresses the right thread end 6.2;

the first locking knob 305 and the second locking knob 320 are rotated counterclockwise to move upwards without contacting with the upper plate of the dual-thread-head rack 301, then the fifth hand wheel 302 is rotated clockwise, the worm structure in the middle of the fifth hand wheel 302 transmits the torsion force to the second worm wheel 325, the second worm wheel 325 is rotated clockwise, the first planetary bevel gear 326 and the second planetary bevel gear 329 revolve around the axis of the second worm wheel 325 along with the second worm wheel 325, the left end bevel gear structure of the first bevel gear set 323 and the right end bevel gear structure of the second bevel gear set 328 engaged with the first planetary bevel gear 326 and the second planetary bevel gear 329 rotate clockwise, the bevel gear structure at the right end of the first bevel gear set 323 transmits the torsion force to the second winding drum 321 through the bevel gear structure at the lower end of the second winding drum 321, the second winding drum 321 rotates clockwise, the right thread head 6.2 is tightened, and the left end bevel gear structure of the second bevel gear set 328 transmits the torsion force to the first winding drum 321 through the bevel gear structure at the lower end of the first winding A winding drum 304, which makes the first winding drum 304 rotate anticlockwise and tightens the left thread end 6.1; the left thread end 6.1 and the right thread end 6.2 can be simultaneously loosened by rotating the fifth hand wheel 302 anticlockwise, and the tightening force of the double-thread steel wire 6 is adjusted by appropriately changing the rotating direction of the fifth hand wheel 302, so that the doctor can find the best effect of resetting the bone gap.

Because the worm gear and worm transmission is adopted between the fifth hand wheel 302 and the second worm gear 325, the transmission is smooth, the tightening force can be adjusted in a stepless manner, the rotating direction can be switched frequently, the tightening and loosening can be realized in time, and the self-locking function is realized, namely, the tightening and loosening of the double-end steel wire 6 can be controlled only by the fifth hand wheel 302, namely, the one-way transmission is realized, and the self-loosening condition can not occur after the double-end steel wire 6 is tightened.

Secondly, when the steel wire led out by two single-end wires needs to be tightened, the screw 309 is screwed out from the threaded hole in the middle of the upper plate of the double-end rack 301, the screw 309 drives the sliding groove piece 308 to move forwards, meanwhile, the front ends of the left long rod 311 and the right long rod 316 are opened, and the screw 309 stops rotating after the left three guide wheels 313 and the right three guide wheels 314 reach a proper distance; then, the first steel wire led out of the first steel wire passes through a variable-diameter groove arranged on the first winding drum 304 and passes through a gap between an eccentric wheel structure of the first wrench 303 and the variable-diameter groove by sequentially passing the first steel wire around a left third guide wheel 313, a left second guide wheel 312 and the left first guide wheel 306, and then the first wrench 303 is pulled anticlockwise to enable the eccentric wheel structure of the first wrench 303 to tightly press the first steel wire; the second wire drawn out of the third guide wheel sequentially bypasses the third right guide wheel 314, the second right guide wheel 315 and the first right guide wheel 319, penetrates into a diameter-variable groove arranged on the second winding drum 321, and is pulled clockwise by the second wrench 322 after passing through a gap between the eccentric wheel structure of the second wrench 322 and the diameter-variable groove, so that the eccentric wheel structure of the second wrench 322 compresses the second wire.

If the first steel wire is to be individually tightened, the first locking knob 305 is first rotated counterclockwise to move upward without contacting the upper plate of the twin-wire frame 301, the second locking knob 320 is then rotated clockwise to move downward and push against the upper plate of the twin-wire frame 301, and the rotation of the second reel 321 is locked, the rotation of the first bevel gear set 323 is also locked, and then the fifth hand wheel 302 is rotated clockwise to rotate the second worm gear 325 clockwise, since the first bevel gear set 323 cannot rotate and the bevel gear structure at the left end cannot rotate, the first and second planetary bevel gears 326 and 329 revolve around their axes along with the second worm gear 325, and also rotate around their axes, and the bevel gear structure at the right end of the gear set 328 engaged with the first and second planetary bevel gears 326 and 329 rotates clockwise, after the meshing transmission of the bevel gear structure at the left end of the second bevel gear set 328 and the bevel gear structure at the lower end of the first reel 304, the first reel 304 rotates anticlockwise, and the first steel wire is tightened; turning the fifth handwheel 302 counterclockwise allows for independent loosening of the first wire.

If the second steel wire needs to be separately tightened, the second locking knob 320 is firstly rotated counterclockwise to move upward without contacting with the upper plate of the double-end frame 301, then the first locking knob 305 is rotated clockwise to move downward and push against the upper plate of the double-end frame 301, and the rotation of the first winding drum 304 is locked, the rotation of the second bevel gear set 328 is also locked, then the fifth hand wheel 302 is rotated clockwise to rotate the second worm gear 325 clockwise, because the second bevel gear set 328 cannot rotate and the bevel gear structure at the right end cannot rotate, the first and second planetary bevel gears 326 and 329 revolve around the axes thereof along with the second worm gear 325, and simultaneously rotate around the axes thereof, and the bevel gear structure at the left end of the first bevel gear set 323 meshed with the first and second planetary bevel gears 326 and 329 rotates clockwise, after the meshing transmission of the bevel gear structure at the right end of the first bevel gear group 323 and the bevel gear structure at the lower end of the second winding drum 321 is carried out, the second winding drum 321 rotates clockwise, and the second steel wire is tightened; turning the fifth handwheel 302 counterclockwise effects a separate release of the second wire.

4) As shown in fig. 18 and 19, when the single-thread steel wire 5 needs to be tightened, the led-out single thread passes through a wire hole at the front end of the single-thread frame 401 and then penetrates into the variable-diameter groove on the third winding drum 403, until the single-thread steel wire 5 passes through a gap between the eccentric wheel and the variable-diameter groove, the third wrench 404 is wrenched clockwise, so that the eccentric wheel structure at the lower end of the third wrench 404 compresses the single-thread steel wire 5, the sixth hand wheel 402 is rotated clockwise, the worm wheel structure at the right end of the worm wheel group 405 engaged with the worm structure at the lower end of the sixth hand wheel 402 also rotates clockwise, the bevel gear structure at the lower end of the third winding drum 403 of the bevel gear structure at the left end of the worm wheel group 405 also rotates clockwise, and the third winding drum 403 rotates clockwise, so that the single-thread steel wire 5 is; the sixth handwheel 402 is rotated counterclockwise to loosen the single-start steel wire 5.

5) When the steel wire needs to be tightened in the operation, firstly, the double-wire-head tightening mechanism 3 or the single-wire-head tightening mechanism 4 is selected according to the number and the type of the led-out steel wire, and is installed on the connecting mechanism 2, and then the connecting mechanism 2 is installed on the top plate 102 of the handheld base 1; the led-out steel wire is connected to the double-wire-end tightening mechanism 3 or the single-wire-end tightening mechanism 4, and the steel wire can be tightened after a one-hand operation mode or a two-hand operation mode is selected according to the actual operation situation and the operation habit of medical staff.