阅读说明：本技术 一种腹腔镜下使用的持针器 (Needle holder used under laparoscope ) 是由 胡逸人 于 2020-05-29 设计创作，主要内容包括：本发明公开了一种腹腔镜下使用的持针器,其技术方案要点是包括有持针器本体,持针器本体包括有供使用者手持的手持杆和用于伸入腹腔内的操作杆,操作杆呈柱状结构设置,操作杆的远离手持杆的一端设置有用于夹持缝合针的持针部和用于驱动持针部沿操作杆径向方向转动的驱动件,持针器本体内设置有用于控制持针部启闭的控制件,驱动件包括有设置于操作杆端面上用于供持针部安装的安装块、以及设置于持针器本体内用于驱动持针部移动的驱动部件,安装块呈半球结构设置并且安装块的端面与操作杆的端面重合设置,安装块上沿其弧面周向设置有经过安装块弧面中心供持针部穿过并移动的持针槽,该持针器在腹腔镜下快速调整缝合针的角度。(The invention discloses a needle holder used under a laparoscope, which has the technical scheme that the needle holder comprises a needle holder body, the needle holder body comprises a hand-held rod for being held by a user and an operating rod for extending into an abdominal cavity, the operating rod is arranged in a columnar structure, one end of the operating rod, which is far away from the hand-held rod, is provided with a needle holding part for holding a suture needle and a driving part for driving the needle holding part to rotate along the radial direction of the operating rod, the needle holder body is internally provided with the control part for controlling the opening and closing of the needle holding part, the driving part comprises an installation block arranged on the end surface of the operating rod and used for installing the needle holding part and a driving part arranged in the needle holder body and used for driving the needle holding part to move, the installation block is arranged in a hemispherical structure, the end surface of the installation block is superposed with the end surface of the operating rod, a needle holding groove for allowing the needle holding part to pass through and move is, the needle holder can rapidly adjust the angle of the suture needle under the laparoscope.)

1. A needle holder used under a laparoscope is characterized by comprising a needle holder body (1), wherein the needle holder body (1) comprises a handheld rod (11) for a user to hold and an operating rod (12) for extending into an abdominal cavity, the operating rod (12) is arranged in a columnar structure, one end, far away from the handheld rod (11), of the operating rod (12) is provided with a needle holding part (2) for holding a suture needle and a driving part (3) for driving the needle holding part (2) to rotate along the radial direction of the operating rod (12), and a control part (4) for controlling the opening and closing of the needle holding part (2) is arranged in the needle holder body (1);

the driving piece (3) is including setting up installation piece (31) that is used for supplying to hold needle portion (2) installation on action bars (12) terminal surface and setting up in needle holder body (1) and be used for driving drive part (32) that hold needle portion (2) and remove, installation piece (31) are the setting of hemisphere structure and the terminal surface of installation piece (31) and the terminal surface coincidence setting of action bars (12), be provided with along its cambered surface circumference on installation piece (31) and supply to hold needle groove (311) of holding that needle portion (2) passed and removed through installation piece (31) cambered surface center.

2. The needle holder for laparoscopic use of claim 1, wherein: the driving component (32) comprises a driven gear (321) which is arranged in the mounting block (31) and used for mounting the needle holding part (2), an auxiliary gear (322) which is arranged in the operating rod (12) and used for being meshed with the driven gear (321), a driving gear (323) which is arranged in the handheld rod (11), and a driving rack (324) which is respectively meshed with one side of the auxiliary gear (322) and one side of the driving gear (323), wherein a driving structure used for driving the driving gear (323) to rotate is arranged in the handheld rod (11).

3. The needle holder for laparoscopic use of claim 2, wherein: the driving structure comprises a first driving groove (111) which is formed in the handheld rod (11) and used for allowing a part of driving gears (323) to extend outwards, the other side, corresponding to the driving rack (324), of the driving gears (323) extends outwards from the first driving groove (111), a first anti-skidding piece for preventing the driving gears (323) from rotating artificially is arranged in the first driving groove (111), and a first groove for embedding gear teeth of the driving gears (323) is formed in the first anti-skidding piece.

4. The needle holder for laparoscopic use of claim 1, wherein: the needle holding part (2) comprises a needle holding shell (21) arranged on the driven gear (321) and a locking mechanism (22) arranged in the needle holding shell (21) and used for clamping the suture needle, wherein a needle holding hole (211) for the locking mechanism (22) to extend out is formed in one side, away from the driven gear (321), of the needle holding shell (21).

5. The needle holder for laparoscopic use of claim 4, wherein: locking mechanical system (22) including sliding connection in hold first latch fitting (221) of the inner wall of pinhole (211), with fixed connection with hold second latch fitting (222) on needle shell (21) lateral wall and be used for driving first latch fitting (221) to holding pinhole (211) and move outward until control (4) with second latch fitting (222) butt, second latch fitting (222) are rectangular platelike structure and set up, and be used for supplying to sew up the preliminary butt of needle, first latch fitting (221) are right angled triangle platelike structure and set up, it is provided with direction boss (212) in pinhole (211), should lead boss (212) along holding needle shell (21) length direction from inside to holding pinhole (211) direction bellied inclined plane gradually, the inclined plane of first latch fitting (221) and the butt inclined plane setting of direction boss (212), when control (4) drive first latch fitting (221) move towards holding pinhole (211) direction this first latch fitting (221) along the oblique inclined plane of direction boss (212) The surface movement engages the second lock (222) to hold the needle.

6. The needle holder for laparoscopic use of claim 5, wherein: control piece (4) are including setting up in first latch fitting (221) keep away from holding pinhole (211) one end connecting block (41) and with connecting block (41) spiro union drive screw (42) and be used for controlling drive screw (42) pivoted screw control part (43), be provided with the groove that slides that supplies first latch fitting (221) to slide to connect along its direction of height on connecting block (41), drive screw (42) forward rotation in-process first latch fitting (221) move gradually and move gradually along the groove length direction that slides.

7. The needle holder for laparoscopic use of claim 6, wherein: the screw control component (43) comprises a screw gear (44) arranged on the driving screw (42), a control gear (45) arranged in the handheld rod (11), and a control rack (46) meshed with one side of the screw gear (44) and one side of the control gear (45), a second driving groove (112) for the control gear (45) to extend outwards is arranged on the hand-held rod (11), the other side of the control gear (45) corresponding to the control rack (46) extends outwards from the second driving groove (112), a second anti-slip sheet for preventing the control gear (45) from non-artificial rotation is arranged in the second driving groove (112), a second groove for embedding the gear teeth of the control gear (45) is arranged on the second antiskid sheet, and a rack control part (5) for controlling the control rack (46) to be far away from or close to the screw gear (44) and the control gear (45) is arranged in the needle holder body (1).

8. The needle holder for laparoscopic use of claim 7, wherein: the rack control part (5) comprises a mounting shell (51) for mounting the control rack (46), a rack groove (52) for controlling the sliding of the rack (46) is arranged in the mounting shell (51), a convex strip (53) which plays a role of guiding the control rack (46) is convexly arranged on the inner side wall of the mounting shell (51), the convex strip (53) comprises a straight strip part positioned in the operating rod (12) and the handheld rod (11) and an arc part positioned in the mounting block (31), an extension part (54) extending to the outside of the needle holder body (1) is arranged on the mounting shell (51), the hand-held rod (11) is provided with a working groove (113) for the extension part (54) to slide along the height direction of the needle holder body (1), the minimum row spacing for driving the needle holding part (2) to rotate by the driving part (32) is the same as the tooth spacing of the control rack (46).

9. The needle holder for laparoscopic use of claim 8, wherein: a control spring (6) which drives a control rack (46) to be meshed with the screw gear (44) and the control gear (45) is arranged in the needle holder body (1), one end of the spring is connected with the outer side wall of the mounting shell (51), and the other end of the spring is connected with the inner side wall of the needle holder body (1).

Technical Field

The invention relates to the technical field of medical instruments, in particular to a needle holder used under a laparoscope.

Background

Laparoscopic surgery is a newly developed minimally invasive method and is a necessary trend for the development of surgical methods. With the rapid advance of industrial manufacturing technology and the fusion of related subjects, a firm foundation is laid for the development of new technology and new method, and more skillful operation of doctors is added, so that many past open operations are replaced by intracavity operations, and the operation trauma is greatly reduced.

However, laparoscopic suturing has a problem of difficulty in comparison with open surgery, and the greatest difficulty is in adjusting the angle of the needle. In the existing suture needles (including suture needles with threads), due to the limited observation angle and operation space, an operator has difficulty in adjusting the suture needle to the best angle with the suture position. Therefore, only skilled abdominocentesis surgeons can carry out laparoscopic suturing clinically, and the suturing needle can be clamped to a proper position by repeatedly adjusting the left hand and the right hand in the suturing process, so that the difficulty of laparoscopic surgery is increased, and the admission threshold of the laparoscopic suturing technology is invisibly improved.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a needle holder used under a laparoscope, which can quickly adjust the angle of a suture needle under the laparoscope.

In order to achieve the purpose, the invention provides the following technical scheme: a needle holder used under a laparoscope comprises a needle holder body, wherein the needle holder body comprises a handheld rod for being held by a user and an operating rod for extending into an abdominal cavity, the operating rod is arranged in a columnar structure, a needle holding part for holding a suture needle and a driving part for driving the needle holding part to rotate along the radial direction of the operating rod are arranged at one end, far away from the handheld rod, of the operating rod, and a control part for controlling the opening and closing of the needle holding part is arranged in the needle holder body;

the driving piece is including setting up the installation piece that is used for supplying to hold the installation of needle portion on the action bars terminal surface and setting up in this internal driver part that is used for driving to hold needle portion and removes of needle holder, the installation piece is the setting of hemisphere structure and the terminal surface of installation piece and the terminal surface coincidence setting of action bars, be provided with along its cambered surface circumference on the installation piece and supply to hold the needle groove of holding that needle portion passed and remove through installation piece cambered surface center.

The invention is further configured to: the driving component comprises a driven gear, an auxiliary gear, a driving gear and a driving rack, wherein the driven gear is arranged in the mounting block and used for mounting the needle holding part, the auxiliary gear is arranged in the operating rod and used for being meshed with the driven gear, the driving gear is arranged in the handheld rod, the driving rack is respectively meshed with one side of the auxiliary gear and one side of the driving gear, and a driving structure used for driving the driving gear to rotate is arranged in the handheld rod.

The invention is further configured to: the driving structure comprises a first driving groove which is arranged on the handheld rod and is used for allowing part of driving gears to extend outwards, the other side, corresponding to the driving rack, of the driving gear extends outwards from the first driving groove, a first anti-slip sheet for preventing the driving gears from rotating artificially is arranged in the first driving groove, and a first groove for embedding the gear teeth of the driving gears is formed in the first anti-slip sheet.

The invention is further configured to: the needle holding part comprises a needle holding shell arranged on the driven gear and a locking mechanism arranged in the needle holding shell and used for clamping the suture needle, and a needle holding hole for the locking mechanism to extend out is formed in one side, far away from the driven gear, of the needle holding shell.

The invention is further configured to: locking mechanical system including sliding connection in the first latch fitting of the inner wall of holding the pinhole and fixed connection with hold the second latch fitting on the needle shell lateral wall and be used for driving first latch fitting to holding the control of the outer removal of pinhole until with the butt of second latch fitting, the second latch fitting is rectangular platelike structure and sets up for supplying the preliminary butt of sewing needle, first latch fitting is right triangle platelike structure and sets up, hold the downthehole direction boss that is provided with of pinhole, should lead the boss and follow and hold the downthehole bellied inclined plane gradually of pinhole direction along holding needle shell length direction, the inclined plane of first latch fitting sets up with the inclined plane butt of direction boss, and this first latch fitting moves cooperation second latch fitting centre gripping sewing needle along the inclined plane of direction boss when control drive first latch fitting moves towards holding pinhole direction.

The invention is further configured to: the control piece is including setting up in first lock keep away from holding pinhole one end connecting block and with the drive screw of connecting block spiro union and be used for controlling drive screw pivoted screw control part, be provided with the groove that slides that supplies first lock to slide to connect along its direction of height on the connecting block, drive screw forward rotates in-process first lock and moves gradually towards holding pinhole direction and move gradually along groove length direction that slides.

The invention is further configured to: the screw control component comprises a screw gear arranged on the driving screw, a control gear arranged in the handheld rod and a control rack meshed with one side of the screw gear and one side of the control gear, a second driving groove for the control gear to extend outwards is formed in the handheld rod, the other side, corresponding to the control rack, of the control gear extends outwards from the second driving groove, a second anti-slip sheet for preventing the control gear from rotating artificially is arranged in the second driving groove, a second groove for embedding the gear teeth of the control gear is formed in the second anti-slip sheet, and a rack control component for controlling the control rack to be far away from or close to the screw gear and the control gear is arranged in the needle holder body.

The invention is further configured to: the rack control part is including the installation casing that supplies the installation of control rack, be provided with the rack groove that supplies the control rack to slide in the installation casing, the inside wall epirelief of installation casing is equipped with the sand grip that plays the guide effect to the control rack, the sand grip is including the straight bar portion that is located action bars and handheld pole and the arc portion that is located the installation piece, be provided with on the installation casing and extend to this external extension of needle holder, be provided with the work groove that supplies the extension to slide along needle holder body direction of height on the handheld pole, drive part drives the minimum row spacing of needle holder pivoted and the tooth pitch of control rack the same.

The invention is further configured to: the needle holder is characterized in that a control spring which drives the control rack to be meshed with the screw gear and the control gear is arranged in the needle holder body, one end of the spring is connected with the outer side wall of the mounting shell, and the other end of the spring is connected with the inner side wall of the needle holder body.

In conclusion, the invention has the following beneficial effects: the handheld rod is thicker than the operating rod, is convenient for a user to hold, is thinner and is convenient to insert into an abdominal cavity, the user enables the needle holding part to clamp the suture needle through the control part at first, then enables the needle to rotate around the radial direction of the operating rod through the driving part until the suture needle on the needle holding part is perpendicular to a suture position, and then swings the handheld rod to enable the suture needle to penetrate through the suture position to carry out suture operation.

Drawings

FIG. 1 is a schematic front view of a needle holder;

FIG. 2 is a schematic diagram of the structure of the needle holder viewed from the right;

FIG. 3 is a schematic view of the driving member;

FIG. 4 is a schematic structural view of the needle holder;

fig. 5 is a perspective view of the rack control part.

Reference numerals: 1. a needle holder body; 11. a hand-held wand; 111. a first active slot; 112. a second active slot; 113. a working groove; 12. an operating lever; 2. a needle holding portion; 21. a needle holding housing; 211. a needle holding hole; 212. a guide boss; 22. a locking mechanism; 221. a first locking member; 222. a second lock; 3. a drive member; 31. mounting blocks; 311. a needle holding groove; 32. a drive member; 321. a driven gear; 322. an auxiliary gear; 323. a driving gear; 324. a drive rack; 4. a control member; 41. connecting blocks; 42. a drive screw; 43. a screw control part; 44. a screw gear; 45. a control gear; 46. a control rack; 5. a rack control part; 51. installing a shell; 52. a rack slot; 53. a convex strip; 54. an extension portion; 6. the spring is controlled.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. In which like parts are designated by like reference numerals. It is noted that the words "front", "rear" and "front" used in the following description,

"left," "right," "upper," and "lower" refer to directions in the drawings, and the words "bottom" and "top," "inner," and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

Referring to fig. 1 to 5, in order to achieve the above object, the present invention provides the following technical solutions: a needle holder used under a laparoscope comprises a needle holder body 1, wherein the needle holder body 1 comprises a handheld rod 11 and an operating rod 12, the handheld rod 11 is used for being held by a user, the operating rod 12 is used for extending into an abdominal cavity, the handheld rod 11 is thick relative to the operating rod 12, the needle holder is convenient for the user to hold, and the operating rod 12 is thin and convenient to insert into the abdominal cavity.

The operating rod 12 is arranged in a columnar structure, the operating rod 12 arranged in the columnar structure is convenient to insert into an abdominal cavity, a user can operate the operating rod easily due to the fact that the operating rod is straight under a laparoscope, a needle holding part 2 used for holding a suture needle and a driving part 3 used for driving the needle holding part 2 to rotate along the radial direction of the operating rod 12 are arranged at one end, far away from the hand holding rod 11, of the operating rod 12, and a control part 4 used for controlling the needle holding part 2 to be opened and closed is arranged in the needle holder body 1; firstly, a user enables a needle holding part 2 to hold a suture needle through a control part 4, then enables the needle holding part to rotate around an operating rod 12 in the radial direction through a driving part 3 until the suture needle on the needle holding part 2 is perpendicular to a suture position, and then swings a hand holding rod 11 to enable the suture needle to penetrate through the suture position and then carries out suture operation.

The driving member 3 includes an installation block 31 disposed on the end surface of the operating rod 12 for installing the needle holding portion 2, and a driving member 32 disposed in the needle holder body 1 for driving the needle holding portion 2 to move, the installation block 31 is disposed in a hemispherical structure, the end surface of the installation block 31 coincides with the end surface of the operating rod 12, and a needle holding groove 311 disposed on the installation block 31 along the circumferential direction of the arc surface thereof for passing and moving the needle holding portion 2 through the center of the arc surface of the installation block 31. The design of the mounting block 31 can ensure that the needle holding part 2 which is positioned outside the mounting block 31 is always unchanged when the needle holding part 2 rotates along the needle holding groove 311, thereby ensuring that the clamping position of the needle holding part 2 is always positioned outside the mounting block 31 and on an arc line, facilitating the angle and distance of the suture needle in the rotating process to be held by a user after multiple uses, and facilitating the user to be familiar with instruments and operations quickly.

The driving member 32 includes a driven gear 321 provided in the mounting block 31 and to which the needle holder 2 is mounted, an auxiliary gear 322 provided in the operating lever 12 and engaged with the driven gear 321, a pinion gear 323 provided in the hand lever 11, and a driving rack 324 engaged with one side of the auxiliary gear 322 and one side of the pinion gear 323, respectively, and a driving structure for driving the pinion gear 323 to rotate is provided in the hand lever 11. The user drives the driving gear 323 to rotate through the driving structure, the driving gear 323 enables the auxiliary gear 322 to rotate through the driving rack 324 meshed with the driving gear 323, the auxiliary gear 322 drives the driven gear 321 to rotate, so that the needle holding part 2 installed on the driven gear 321 rotates, and the design of the auxiliary gear 322 is that: since the position of the driven gear 321 is located in the mounting block 31 and the driven gear 321 needs to drive the needle holding part 2 to rotate around the circumference of the mounting block 31, the space in the mounting block 31 is small, and the space condition that the driving rack 324 is engaged with the driving rack 324 and the driving rack 324 moves is not satisfied, so that the transmission is performed through the auxiliary gear 322.

The driving structure comprises a first driving groove 111 arranged on the hand-held rod 11 and used for allowing part of the driving gear 323 to extend outwards, the other side of the driving gear 323 corresponding to the driving rack 324 extends outwards from the first driving groove 111, a first anti-slip sheet for preventing the driving gear 323 from rotating without human is arranged in the first driving groove 111, a first groove for embedding the gear teeth of the driving gear 323 is arranged on the first anti-slip sheet, the first anti-slip sheet is made of rubber materials and effectively blocks the rotation of the driving gear 323 to prevent the driving gear 323 from rotating without human, the first groove is designed to enable part of the gear teeth of the driving gear 323 to be embedded, the obvious pause and frustration feeling is generated in the process that the user pushes the driving gear 323 to rotate, so that the user has more definite feeling on the rotating angle, and the function of preventing the driving gear 323 from rotating under the non-artificial condition can be realized. The first active slot 111 has two design positions: 1. is positioned at the front side of the hand-held rod 11, and can be separated from a second active groove 112 in the following when positioned at the front side as shown in figure 1, so that the hand-held rod is convenient for a user to operate by one hand; 2. on the side of the hand lever 11, the driving direction of the driving gear 323 and the rotating direction of the driven gear 321 are consistent, and the user can clearly see and operate the hand lever during pushing.

The needle holding part 2 includes a needle holding housing 21 mounted on the driven gear 321, and a locking mechanism 22 provided in the needle holding housing 21 for clamping the suture needle, and a needle holding hole 211 for the locking mechanism 22 to protrude is provided on a side of the needle holding housing 21 away from the driven gear 321. By driving the control member 4, the locking mechanism 22 is gradually moved out from the needle holding hole 211 and gradually grips the suture needle. The design structure is compact, and when the locking mechanism 22 moves out of the needle holding hole 211, the needle holding hole 211 can be relatively blocked, so that the condition that the suture thread falls into a movable gap to cause suture failure is effectively avoided.

Locking mechanical system 22 is including the first latch fitting 221 of sliding connection at the inner wall of holding pinhole 211, and fixed connection with hold the second latch fitting 222 on the needle shell 21 lateral wall, and be used for driving first latch fitting 221 to hold the control 4 of pinhole 211 outer removal until with second latch fitting 222 butt, second latch fitting 222 is rectangular platelike structure setting, and be used for supplying the preliminary butt of sewing needle, first latch fitting 221 is the setting of right triangle platelike structure, hold and be provided with direction boss 212 in the pinhole 211, this direction boss 212 is along holding the protruding inclined plane of pinhole 211 direction gradually in needle shell 21 length direction, the inclined plane of first latch fitting 221 and the inclined plane butt setting of direction boss 212, this first latch fitting 221 moves along the inclined plane of direction boss 212 and cooperates the centre gripping of sewing needle second latch fitting 222 centre gripping when control 4 drive first latch fitting 221 moves towards holding pinhole 211 direction. The design of second latch 222 is in the hole position top of holding pinhole 211 for supply the user to judge the clamping position, when second latch 222 and sewing needle butt, make first latch 221 be close to the direction boss 212 gradually through control 4, and be close to until making the sewing needle of original and second latch 222 butt fixed spacing under first latch 221 and second latch 222 interact with second latch 222 butt towards second latch 222 position under the effect of direction boss 212. This fixed centre gripping is effectual, holds the pinhole 211 by the shutoff after fixed the completion, avoids the stylolite to be blocked in the activity joint position, causes the condition of sewing up failure.

The control member 4 includes a connecting block 41 disposed at one end of the first locking member 221 far from the needle holding hole 211, a driving screw 42 screwed with the connecting block 41, and a screw control member 43 for controlling the rotation of the driving screw 42, a sliding groove for sliding connection of the first locking member 221 is disposed on the connecting block 41 along the height direction thereof, and the first locking member 221 gradually moves towards the needle holding hole 211 and gradually moves along the length direction of the sliding groove in the forward rotation process of the driving screw 42. The effect of the driving screw 42 makes the connecting block 41 move stably, and in the process that the connecting block 41 drives the first locking piece 221 to move, the connecting block also moves upwards along with the sliding groove, so as to cater to the effect of the guiding boss 212, and the design not only moves stably, but also the first locking piece 221 can move flexibly along with the guiding boss 212. Besides, a spring which can enable the first locking piece 221 to be far away from the second locking piece 222 is designed in the sliding groove, so that the situation that the first locking piece 221 is not reset after being clamped with the sliding groove to cause backward movement, and the first locking piece 221 cannot be normally clamped when being moved out next time is prevented.

The screw control part 43 comprises a screw gear 44 arranged on the driving screw 42, a control gear 45 arranged in the handheld rod 11, and a control rack 46 meshed with one side of the screw gear 44 and one side of the control gear 45, a second driving groove 112 for the control gear 45 to extend outwards is arranged on the handheld rod 11, the other side of the control gear 45 corresponding to the control rack 46 extends outwards from the second driving groove 112, a second anti-slip sheet for preventing the control gear 45 from rotating artificially is arranged in the second driving groove 112, a second groove for embedding gear teeth of the control gear 45 is arranged on the second anti-slip sheet, and a rack control part 5 for controlling the control rack 46 to be far away from or close to the screw gear 44 and the control gear 45 is arranged in the needle holder body 1. During rotation of the control gear 45, the user rotates the screw gear 44 via the control rack 46, thereby rotating the drive screw 42 to move out the first locking element 221. The design of the rack control part 5 prevents the driving screw 42 from rotating when the driving part 3 drives the needle holding part 2 to rotate, and avoids releasing the needle holding part after the clamping is successful, so that the needle holding part needs to be clamped for many times, and is inconvenient and not flexible enough. The design of the second anti-skid sheet and the second groove is consistent with the function of the first anti-skid sheet and the first groove.

The rack control part 5 comprises a mounting shell 51 for mounting the control rack 46, a rack groove 52 for sliding the control rack 46 is arranged in the mounting shell 51, a convex strip 53 for guiding the control rack 46 is convexly arranged on the inner side wall of the mounting shell 51, the convex strip 53 comprises a straight strip part positioned in the operating rod 12 and the handheld rod 11 and an arc part positioned in the mounting block 31, an extending part 54 extending out of the needle holder body 1 is arranged on the mounting shell 51, a working groove 113 for sliding the extending part 54 along the height direction of the needle holder body 1 is arranged on the handheld rod 11, and the minimum row spacing for driving the needle holder 2 to rotate by the driving part 32 is the same as the tooth pitch of the control rack 46. The control rack 46 can move in the mounting housing 51 along the length direction of the convex strip 53 and is staggered with the screw gear 44 and the control gear 45 when the mounting housing 51 moves upwards, and the pitch of the rack is the same as that of the driven gear 321 caused by the rotation of the middle driving gear 323 by one pitch, so that the subsequent mounting housing 51 can be meshed during the return movement.

A control spring 6 which drives the control rack 46 to be meshed with the screw gear 44 and the control gear 45 is arranged in the needle holder body 1, one end of the spring is connected with the outer side wall of the mounting shell 51, and the other end of the spring is connected with the inner side wall of the needle holder body 1. The control spring 6 is designed to be convenient for a user, and the control rack 46 is always engaged with the screw gear 44 and the control gear 45, and is disengaged only when the extension 54 is manually pushed.

The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.