阅读说明：本技术 一种骨科手术取钉器 (Nail extractor for orthopedic operation ) 是由 苏唐芹 冯建国 王旭 于 2019-11-13 设计创作，主要内容包括：本发明属于骨科器具技术领域,具体的说是一种骨科手术取钉器；包括外套管；外套管内固定有内支撑管,且内支撑管设置有内螺纹；内支撑管内螺纹连接有转动丝杆,且转动丝杆的底端可拆卸安装有刀管头,且转动丝杆的顶端设置有手柄；外套管上设置有螺钉夹紧机构；转动套环螺纹连接在外套管上；滑动槽内均设置梯形斜块,且梯形斜块的一端面突出外套管的外壁；梯形斜块的另一端面通过空腔连杆连接有梯形卡块,且梯形卡块的位于外套管内部；梯形卡块位于内支撑管的底端；刀管头的底端为十字式刀头；防止由于螺钉过长,导致作用在螺钉头部的扭转力过大,而出现螺钉在人体骨头上发生扭转断裂的现象,进而影响医护人员对螺钉的安全取出工作。(The invention belongs to the technical field of orthopedic instruments, and particularly relates to a nail extractor for orthopedic surgery; comprises an outer sleeve; an inner supporting pipe is fixed in the outer sleeve and is provided with an internal thread; a rotary screw rod is connected in the inner thread of the inner support pipe, a cutter head is detachably mounted at the bottom end of the rotary screw rod, and a handle is arranged at the top end of the rotary screw rod; a screw clamping mechanism is arranged on the outer sleeve; the rotating lantern ring is connected to the outer sleeve in a threaded manner; trapezoidal inclined blocks are arranged in the sliding grooves, and one end face of each trapezoidal inclined block protrudes out of the outer wall of the outer sleeve; the other end face of the trapezoid inclined block is connected with a trapezoid clamping block through a cavity connecting rod, and the trapezoid clamping block is positioned inside the outer sleeve; the trapezoidal fixture block is positioned at the bottom end of the inner supporting tube; the bottom end of the cutter head is provided with a cross-shaped cutter head; the phenomenon that the screw is twisted and broken on the bone of a human body due to overlarge twisting force acting on the head of the screw caused by overlong screw is prevented, and the safe taking-out work of medical personnel on the screw is further influenced.)

1. The utility model provides an orthopedic operation nail extractor which characterized in that: comprises an outer sleeve (1), an inner supporting tube (2), a rotary screw rod (3), a handle (4) and a cutter tube head (5); an inner supporting tube (2) is fixed in the outer sleeve (1), and the inner supporting tube (2) is provided with an internal thread; a rotary screw rod (3) is connected with the inner supporting tube (2) through an internal thread, a cutter head (5) is detachably mounted at the bottom end of the rotary screw rod (3), and a handle (4) is arranged at the top end of the rotary screw rod (3); the circumferential wall of the outer sleeve (1) is provided with at least 4 sliding grooves (11); a screw clamping mechanism (6) is arranged on the outer sleeve (1); the screw clamping mechanism (6) comprises a rotary lantern ring (61), a trapezoidal inclined block (62), a cavity connecting rod (63) and a trapezoidal clamping block (64); the rotary lantern ring (61) is in threaded connection with the outer sleeve (1); trapezoidal inclined blocks (62) are arranged in the sliding grooves (11), and one end face of each trapezoidal inclined block (62) protrudes out of the outer wall of the outer sleeve (1); the other end face of the trapezoidal inclined block (62) is connected with a trapezoidal clamping block (64) through a cavity connecting rod (63), and the trapezoidal clamping block (64) is positioned inside the outer sleeve (1); one side surface of the trapezoidal fixture block (64) is arranged to be a horizontal plane, and the trapezoidal fixture block (64) is positioned at the bottom end of the inner support pipe (2); the bottom end of the cutter head (5) is provided with a cross-shaped cutter head (51), and the cutter head (51) is provided with a magnet block; the bottom end of the inner supporting tube (2) is provided with a miniature camera.

2. An orthopedic surgical staple remover according to claim 1, wherein: at least 4 extrusion grooves (611) are formed in the inner wall of the rotating sleeve ring (61), and the extrusion grooves (611) correspond to the sliding grooves (11); a cavity limiting rod (7) is arranged at the notch of the extrusion groove (611); the outer end face of the top end of the trapezoid inclined block (62) is provided with a fillet, the outer end face of the top end of the trapezoid inclined block (62) is provided with a limiting groove (621), and the limiting groove (621) corresponds to the cavity limiting rod (7).

3. An orthopedic surgical staple remover according to claim 2, wherein: an arc-shaped clamping plate (8) is arranged on the outer end face of the trapezoid clamping block (64), and a rubber bulge (81) is arranged on the outer wall of the arc-shaped clamping plate (8); the top end of the arc-shaped clamping plate (8) is provided with a bending edge.

4. An orthopedic surgical staple remover according to claim 3, wherein: an extrusion cavity is formed in the trapezoidal fixture block (64), and the trapezoidal fixture block (64) is made of elastic rubber fiber materials; the arc-shaped clamping plate (8) is made of elastic rubber materials, and an expansion cavity (82) is formed in the arc-shaped clamping plate (8); the expansion chamber (82) is communicated with the extrusion chamber through an air guide hole.

5. An orthopedic surgical staple remover according to claim 4, wherein: a limiting cavity (612) is formed in the rotating lantern ring (61); the end part of the cavity limiting rod (7) is provided with an air guide hole, and the end part of the cavity limiting rod (7) is connected into the limiting cavity (612); an air guide groove is formed in the trapezoid inclined block (62), one end of the air guide groove is communicated with the limiting groove (621), and the other end of the air guide groove is communicated with one of the cavity connecting rods (63); the cavity connecting rod (63) is communicated with the extrusion cavity.

6. An orthopedic surgical staple remover according to claim 1, wherein: the bottom end of the inner supporting tube (2) is provided with a clamping groove (21); the cutter tube head (5) is provided with a rotation limiting block (9), and the rotation limiting block (9) corresponds to the clamping groove (21).

Technical Field

The invention belongs to the technical field of orthopedic instruments, and particularly relates to a nail extractor for orthopedic surgery.

Background

Fracture refers to the interruption of the integrity and continuity of bone. At present, for patients who have obvious displacement and need to perform incision reduction and internal fixation, the bone blocks at the fracture part are usually reset and fixed again through a steel plate and bone nails, so that the dislocated bone blocks are re-tightly connected together under the action of a steel plate screw system, and then after long-time postoperative growth, new callus grows out from the fractured bone blocks and is healed again together.

The internal fixation screw is required to be taken out in 1 to 2 years after the internal osteosynthesis so as to avoid rejection reaction and the like.

When the existing screw extractor takes out the screws fixed in the screw extractor, particularly the screws with longer length, the steel nails can generate micro-motion displacement due to overlong healing time or are welded with the steel plate and are difficult to take out; simultaneously because present nail ware of getting is mostly with torsional force effect in the head of screw, because the length overlength of screw, when the torsional force was too big, can lead to the screw fracture in the bone, and then the safety of influence screw is taken out, causes the secondary damage to the patient simultaneously.

Disclosure of Invention

In order to make up for the defects of the prior art, the invention provides the screw extractor for the orthopedic surgery, which is mainly used for solving the problems that most of the existing screw extractors apply torsional force to the head of a screw, and the screw is broken in a bone when the torsional force is too large due to too long length of the screw, so that the safe extraction of the screw is influenced, and meanwhile, secondary injury is caused to a patient.

The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a nail extractor for orthopedic surgery, which comprises an outer sleeve, an inner supporting tube, a rotary screw rod, a handle and a cutter tube head; an inner supporting pipe is fixed in the outer sleeve and is provided with an internal thread; a rotary screw rod is connected in the inner supporting pipe through threads, a cutter head is detachably mounted at the bottom end of the rotary screw rod, and a handle is arranged at the top end of the rotary screw rod; the circumferential wall of the outer sleeve is provided with at least 4 sliding grooves; a screw clamping mechanism is arranged on the outer sleeve; the screw clamping mechanism comprises a rotating lantern ring, a trapezoidal inclined block, a cavity connecting rod and a trapezoidal clamping block; the rotating lantern ring is connected to the outer sleeve in a threaded mode; trapezoidal inclined blocks are arranged in the sliding grooves, and one end face of each trapezoidal inclined block protrudes out of the outer wall of the outer sleeve; the other end face of the trapezoid inclined block is connected with a trapezoid clamping block through a cavity connecting rod, and the trapezoid clamping block is positioned inside the outer sleeve; one side surface of the trapezoidal fixture block is arranged to be a horizontal plane, and the trapezoidal fixture block is positioned at the bottom end of the inner supporting tube; the bottom end of the cutter head is provided with a cross-shaped cutter head, and a magnet block is arranged on the cutter head; the bottom end of the inner supporting tube is provided with a miniature camera; when the bone screw taking-out device works, when medical staff needs to take out a screw on a bone through an operation, the medical staff opens the micro camera, meanwhile, one hand of the medical staff holds the outer sleeve, the other hand rotates the handle clockwise, and the screw rod is rotated to drive the cutter head on the cutter head pipe to be inserted into the cross hole of the screw; when the cross-shaped cutter head is inserted into the cross hole, medical personnel loosens the outer sleeve, the handle is rotated anticlockwise, the handle drives the cutter head to loosen the screw through the rotating screw rod, when the screw is loosened, the medical personnel holds the column outer sleeve, the rotating screw rod drives the cutter head to move upwards along with continuous anticlockwise rotation of the rotating handle, the screw is adsorbed and fixed by the magnet block at the end part of the cutter head, the rotating screw rod drives the screw to move into the outer sleeve, when the head of the screw moves to the bottom end of the inner supporting tube, the medical personnel stops rotating the handle, the medical personnel rotates the rotating sleeve ring to enable the rotating sleeve ring to move downwards, the movable rotating sleeve ring can extrude the trapezoidal inclined block arranged on the outer sleeve in a sliding mode, the extrusion force of the trapezoidal inclined blocks can push the end faces of the trapezoidal fixture blocks to be clamped on the outer wall of the screw through the cavity connecting rod, and the set, the outer tube rotates once more, and the tight power of supporting of the tight package power of clamp and the sword tube head of trapezoidal fixture block can be so that the outer tube is dismantled the longer screw of length, prevents because the screw overlength, and the healing of patient fracture department wound leads to the fracture department to appear chucking or the phenomenon of holding tightly to the screw, leads to being used in the torsional force of screwhead portion too big, and then the screw takes place torsional fracture's phenomenon on human bone, and then influences medical personnel and take out the work to the safety of screw.

Preferably, at least 4 extrusion grooves are formed in the inner wall of the rotating lantern ring, and the extrusion grooves correspond to the sliding grooves; a cavity limiting rod is arranged at the notch of the extrusion groove; the outer end face of the top end of the trapezoid inclined block is provided with a round angle, the outer end face of the top end of the trapezoid inclined block is provided with a limiting groove, and the limiting groove corresponds to the cavity limiting rod; when the rotary lantern ring rotates downwards to extrude the trapezoid inclined block, the round angle arranged at the top end of the trapezoid inclined block is matched with the extrusion groove, so that the rotary lantern ring can be quickly clamped on the trapezoid inclined block; when the lantern ring rotates and all extrudees trapezoidal sloping block to the sliding tray in, the cavity gag lever post inserts the spacing inslot, and the cooperation of cavity gag lever post and spacing groove can rotate spacing effect to the rotating lantern ring, prevents that the outer tube from rotating the phenomenon that the lantern ring took place the rotation when rotating, and then influences the parcel block operation of trapezoidal fixture block to the screw.

Preferably, an arc-shaped clamping plate is arranged on the outer end face of the trapezoid clamping block, and a rubber bulge is arranged on the outer wall of the arc-shaped clamping plate; the top end of the arc-shaped clamping plate is provided with a bent edge; when the outer sleeve pipe is in operation, when the plurality of trapezoidal clamping blocks move towards the outer wall of the screw, the arranged arc-shaped clamping plate can wrap a circular wrapping body on the outer wall of the screw, and meanwhile, the rubber bulge arranged on the arc-shaped clamping plate can be extruded and attached to the outer wall of the screw, so that the friction force between the arc-shaped clamping plate and the outer wall of the screw is increased, the clamping wrapping force of the outer sleeve pipe on the screw is increased, and the phenomenon that the outer pipe body rotates due to the fact that the clamping force between the trapezoidal clamping blocks and the outer wall of the screw is too small when the outer sleeve pipe rotates is prevented; when the outer wall of screw was blocked to arc block board, the limit of bending can support the bottom of tightly reaching the spiral shell head of screw, and then supports tightly including on the outer wall of stay tube with the screw, prevents that the screw from producing the phenomenon of rocking in outer body.

Preferably, an extrusion cavity is formed in the trapezoidal fixture block, and the trapezoidal fixture block is made of elastic rubber fiber materials; the arc-shaped clamping plate is made of elastic rubber materials, and an expansion cavity is formed in the arc-shaped clamping plate; the expansion cavity is communicated with the extrusion cavity through an air guide hole; the during operation, when trapezoidal sloping block is when extrudeing trapezoidal fixture block, the inside gas of trapezoidal fixture block can enter into the inflation intracavity through the gas guide hole, along with the continuous entering of inflation intracavity gas, the inflation in inflation chamber can make arc block board extrusion laminating on the outer wall of bolt, and then increase arc block board to the parcel clamping force of screw outer wall, make outer body when rotating, can take off the screw from the bone fast, make simultaneously that the torsional force of outer body can be even on the screw.

Preferably, a limit cavity is formed in the rotating lantern ring; the end part of the cavity limiting rod is provided with an air guide hole, and the end part of the cavity limiting rod is connected into the limiting cavity; the trapezoidal inclined block is provided with an air guide groove, one end of the air guide groove is communicated with the limiting groove, and the other end of the air guide groove is communicated with one of the cavity connecting rods; the cavity connecting rod is communicated with the extrusion cavity; during operation, when medical personnel dismantles the screw through rotating outer body, medical personnel can extrude the rotation lantern ring, the extrusion of rotation lantern ring can make the top block of inside cavity gag lever post to the air guide recess in, simultaneously gas in the spacing intracavity can enter into the air guide recess through the spacing pipe of cavity, the gas that gets into the air guide inslot can enter into the extrusion intracavity through the cavity connecting rod, along with gaseous continuous entering in the extrusion intracavity, not only can make trapezoidal fixture block inflation, make the arc block board produce the inflation simultaneously, further increase arc block board presss from both sides tight dynamics to the screw parcel, make the cavity gag lever post can closely block to the spacing inslot simultaneously, make the rotation lantern ring can play the extruded effect of closely laminating to trapezoidal sloping block, and then increase the dismantlement of outer body to the screw.

Preferably, the bottom end of the inner supporting tube is provided with a clamping groove; a rotation limiting block is arranged on the cutter head and corresponds to the clamping groove; the during operation, when rotating the lead screw and driving the tool bit pipe rebound, the tool bit pipe can enter into interior support pipe, and then the rotation stopper that sets up on the tool bit pipe can block into the block recess, and then the block recess will play the spacing effect of rotation to the tool bit pipe with rotating the lead screw, prevent that outer body when rotating, the phenomenon of rotation takes place for the lead screw rotates, leads to the tool bit on the tool bit pipe to make the phenomenon that the screw took place to rock, and then influences medical personnel to the dismantlement of screw.

The invention has the following beneficial effects:

1. according to the invention, through the clamping and wrapping force of the trapezoidal clamping block and the abutting force of the cutter head, the outer sleeve can detach the screw with longer length, so that the phenomenon that the screw is clamped or clasped at the fracture part of a patient due to the healing of the wound at the fracture part of the patient due to the overlong screw is prevented, the phenomenon that the screw is torsionally broken on the bone of a human body due to overlarge torsional force acting on the head of the screw is prevented, and the safe taking-out work of the screw by medical personnel is further influenced.

2. According to the invention, the rubber bulge arranged on the arc-shaped clamping plate can be extruded and attached to the outer wall of the screw, so that the friction force between the arc-shaped clamping plate and the outer wall of the screw is increased, the clamping wrapping force of the outer sleeve on the screw is increased, and the phenomenon of self-rotation of the outer pipe body caused by the undersize clamping force of the trapezoidal clamping block and the outer wall of the screw when the outer sleeve rotates is prevented; the limit of bending can support the bottom of tight spiral shell head to the screw, and then supports the screw tightly on the outer wall of stay tube including, prevents that the screw from producing the phenomenon of rocking in outer body, and then influences the safe work of dismantling of screw.

Drawings

The invention will be further explained with reference to the drawings.

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a cross-sectional view of the present invention;

FIG. 3 is an assembly view of the screw clamping mechanism and outer body of the present invention;

FIG. 4 is an enlarged view of a portion of the invention at A in FIG. 2;

in the figure: the tool comprises an outer sleeve 1, a sliding groove 11, an inner supporting tube 2, a clamping groove 21, a rotary screw rod 3, a handle 4, a tool bit head 5, a tool bit 51, a screw clamping mechanism 6, a rotary lantern ring 61, an extrusion groove 611, a limiting cavity 612, a trapezoidal inclined block 62, a limiting groove 621, a cavity connecting rod 63, a trapezoidal clamping block 64, a cavity limiting rod 7, an arc-shaped clamping plate 8, a rubber bulge 81, an expansion cavity 82 and a rotary limiting block 9.

Detailed Description

An orthopedic surgical staple remover according to an embodiment of the present invention will be described below with reference to fig. 1 to 4.

As shown in fig. 1-4, the orthopedic surgery nail extractor comprises an outer sleeve 1, an inner support tube 2, a rotary screw rod 3, a handle 4 and a cutter head 5; an inner supporting tube 2 is fixed in the outer sleeve 1, and the inner supporting tube 2 is provided with an internal thread; a rotary screw rod 3 is connected with the inner supporting tube 2 through an internal thread, a cutter head 5 is detachably mounted at the bottom end of the rotary screw rod 3, and a handle 4 is arranged at the top end of the rotary screw rod 3; the circumferential wall of the outer sleeve 1 is provided with at least 4 sliding grooves 11; the outer sleeve 1 is provided with a screw clamping mechanism 6; the screw clamping mechanism 6 comprises a rotating lantern ring 61, a trapezoid inclined block 62, a cavity connecting rod 63 and a trapezoid clamping block 64; the rotating lantern ring 61 is in threaded connection with the outer sleeve 1; trapezoidal inclined blocks 62 are arranged in the sliding grooves 11, and one end face of each trapezoidal inclined block 62 protrudes out of the outer wall of the outer sleeve 1; the other end face of the trapezoid inclined block 62 is connected with a trapezoid clamping block 64 through a cavity connecting rod 63, and the trapezoid clamping block 64 is positioned inside the outer sleeve 1; one side surface of the trapezoidal fixture block 64 is set to be a horizontal plane, and the trapezoidal fixture block 64 is positioned at the bottom end of the inner support tube 2; the bottom end of the cutter head 5 is provided with a cross-shaped cutter head 51, and the cutter head 51 is provided with a magnet block; the bottom end of the inner supporting tube 2 is provided with a miniature camera; when the bone screw taking-out device works, when medical staff needs to take out a screw on a bone through an operation, the medical staff opens the micro camera, meanwhile, one hand of the medical staff holds the outer sleeve 1, the other hand rotates the handle 4 clockwise, and the screw rod 3 is rotated to insert the tool bit 51 on the tool bit 51 tube into the cross hole of the screw; when the cross-shaped cutter head 51 is inserted into the cross hole, the medical staff loosens the outer sleeve 1, the handle 4 is rotated anticlockwise, the handle 4 can drive the cutter head 51 to loosen the screw by rotating the screw rod 3, when the screw is loosened, the medical staff holds the column outer sleeve 1, the rotating screw rod 3 can drive the cutter head 51 to move upwards along with the continuous anticlockwise rotation of the rotating handle 4, the screw can be adsorbed and fixed by the magnet block at the end part of the cutter head 51, the rotating screw rod 3 can drive the screw to move into the outer sleeve, when the head part of the screw moves to the bottom end of the inner supporting tube 2, the medical staff stops rotating the handle 4, the medical staff rotates the rotating sleeve ring to enable the rotating sleeve ring 61 to move downwards, the moving rotating sleeve ring 61 can extrude the trapezoid inclined block 62 arranged on the outer sleeve 1 in a sliding manner, the extrusion force of the trapezoid inclined blocks 62 can push the end surfaces of the trapezoid clamping blocks 64, a plurality of trapezoidal fixture blocks 64 that set up can wrap up on the screw outer wall, rotate outer tube 1 once more, trapezoidal fixture block 64 press from both sides tight package power and the tight power of supporting of sword tube head 5, can make outer tube 1 dismantle the longer screw of length, prevent because the screw overlength, the healing of patient's fracture department wound leads to the fracture department to appear chucking or the phenomenon of holding tightly to the screw, the torsional force that leads to being used in the screwhead portion is too big, and then the screw takes place torsional fracture's phenomenon on human bone appears, and then the work is taken out to the safety of screw to influence medical personnel.

As an embodiment of the present invention, at least 4 extrusion grooves 611 are formed on the inner wall of the rotating collar 61, and the extrusion grooves 611 correspond to the sliding grooves 11; a cavity limiting rod 7 is arranged at the notch of the extrusion groove 611; a fillet is arranged on the outer end face of the top end of the trapezoid inclined block 62, a limiting groove 621 is arranged on the outer end face of the top end of the trapezoid inclined block 62, and the limiting groove 621 corresponds to the cavity limiting rod 7; when the rotating lantern ring 61 rotates downwards to squeeze the trapezoid inclined block 62 in the working process, the round angle arranged at the top end of the trapezoid inclined block 62 is matched with the squeezing groove 611, so that the rotating lantern ring 61 can be quickly clamped on the trapezoid inclined block 62; when the lantern ring 61 rotates and all extrudees trapezoidal sloping block 62 to sliding tray 11 in, cavity gag lever post 7 inserts the spacing groove 621, and cavity gag lever post 7 and spacing groove 621's cooperation can rotate spacing effect to rotating lantern ring 61, prevents that outer tube 1 from rotating the phenomenon that the lantern ring 61 took place the rotation when rotating, and then influences trapezoidal fixture block 64 to the parcel block operation of screw.

As an embodiment of the present invention, an arc-shaped engaging plate 8 is disposed on an outer end surface of the trapezoid engaging block 64, and a rubber protrusion 81 is disposed on an outer wall of the arc-shaped engaging plate 8; the top end of the arc-shaped clamping plate 8 is provided with a bent edge; when the outer sleeve 1 rotates, the clamping force of the trapezoid clamping blocks 64 and the outer wall of the screw is prevented from being too small, so that the outer pipe body rotates; when the arc-shaped clamping plate 8 is clamped on the outer wall of the screw, the bending edge can be abutted against the bottom end of the screw head of the screw, and then the screw is abutted against the outer wall of the inner supporting tube 2, so that the screw is prevented from shaking in the outer tube body.

As an embodiment of the present invention, an extrusion cavity is formed inside the trapezoidal fixture block 64, and the trapezoidal fixture block 64 is made of an elastic rubber fiber material; the arc-shaped clamping plate 8 is made of elastic rubber materials, and an expansion cavity 82 is formed in the arc-shaped clamping plate 8; the expansion cavity 82 is communicated with the extrusion cavity through an air guide hole; the during operation, when trapezoidal sloping block 62 is when extrudeing trapezoidal fixture block 64, the inside gas of trapezoidal fixture block 64 can enter into inflation chamber 82 through the gas guide hole, along with the continuous entering of gas in inflation chamber 82, the inflation in inflation chamber 82 can make 8 extrusion laminating of arc block board on the outer wall of bolt, and then increase 8 parcel clamping force to the screw outer wall of arc block board, make outer body when rotating, can take off the screw from the bone fast, make simultaneously that the torsional force of outer body can be even use on the screw.

As an embodiment of the present invention, a limiting cavity 612 is formed in the rotating collar 61; the end part of the cavity limiting rod 7 is provided with an air guide hole, and the end part of the cavity limiting rod 7 is connected into the limiting cavity 612; an air guide groove is formed in the trapezoid inclined block 62, one end of the air guide groove is communicated with the limiting groove 621, and the other end of the air guide groove is communicated with one of the cavity connecting rods 63; the cavity connecting rod 63 is communicated with the extrusion cavity; during operation, when medical personnel dismantles the screw through rotating outer body, medical personnel can extrude the rotation lantern ring 61, the extrusion of rotation lantern ring 61 can make the top block of inside cavity gag lever post 7 to the air guide recess in, simultaneously gas in the spacing chamber 612 can enter into the air guide recess through the spacing pipe of cavity, the gas that gets into the air guide inslot can enter into the extrusion intracavity through cavity connecting rod 63, along with the gaseous continuous entering in the extrusion intracavity, not only can make trapezoidal fixture block 64 inflation, make arc clamping plate 8 produce the inflation simultaneously, further increase arc clamping plate 8 and to the tight dynamics of screw parcel clamp, make cavity gag lever post 7 can closely block in the spacing groove 621 simultaneously, make rotation lantern ring 61 can play closely laminating extruded effect to trapezoidal sloping block 62, and then increase the dismantlement of outer body to the screw.

As an embodiment of the present invention, the bottom end of the inner support tube 2 is provided with a fastening groove 21; a rotation limiting block 9 is arranged on the cutter head 5, and the rotation limiting block 9 corresponds to the clamping groove 21; the during operation, when rotating lead screw 3 and driving tool bit 51 pipe rebound, tool bit 51 pipe can enter into interior support pipe 2, and then the rotation stopper 9 that sets up on the tool bit 51 pipe can block into block recess 21, and then block recess 21 will play the spacing effect of rotation to tool bit 51 pipe and rotation lead screw 3, prevent that outer body is when rotating, the phenomenon of rotation takes place for rotation lead screw 3, lead to tool bit 51 on the tool bit 51 pipe to make the phenomenon that the screw takes place to rock, and then influence medical personnel to the dismantlement of screw.

The specific working process is as follows:

when the bone screw taking-out device works, when medical staff needs to take out a screw on a bone through an operation, the medical staff opens the micro camera, meanwhile, one hand of the medical staff holds the outer sleeve 1, the other hand rotates the handle 4 clockwise, and the screw rod 3 is rotated to insert the tool bit 51 on the tool bit 51 tube into the cross hole of the screw; when the cross-shaped cutter head 51 is inserted into the cross hole, the medical staff loosens the outer sleeve 1, the handle 4 is rotated anticlockwise, the handle 4 can drive the cutter head 51 to loosen the screw by rotating the screw rod 3, when the screw is loosened, the medical staff holds the column outer sleeve 1, the rotating screw rod 3 can drive the cutter head 51 to move upwards along with the continuous anticlockwise rotation of the rotating handle 4, the screw can be adsorbed and fixed by the magnet block at the end part of the cutter head 51, the rotating screw rod 3 can drive the screw to move into the outer sleeve, when the head part of the screw moves to the bottom end of the inner supporting tube 2, the medical staff stops rotating the handle 4, the medical staff rotates the rotating sleeve ring to enable the rotating sleeve ring 61 to move downwards, the moving rotating sleeve ring 61 can extrude the trapezoid inclined block 62 arranged on the outer sleeve 1 in a sliding manner, the extrusion force of the trapezoid inclined blocks 62 can push the end surfaces of the trapezoid clamping blocks 64, a plurality of trapezoidal fixture blocks 64 that set up can wrap up on the screw outer wall, rotates outer tube 1 once more, and trapezoidal fixture block 64 presss from both sides tight package power and the tight power of supporting of sword tube head 5, can be so that outer tube 1 dismantles the longer screw of length.

In the description of the present invention, it is to be understood that the terms "center", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the present invention.

While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.