CN211633536U

CN211633536U - Atlantoaxial dislocation posterior repositor with movable arm

Info

Publication number: CN211633536U
Application number: CN202020096066.6U
Authority: CN
Inventors: 马向阳; 马浩天
Original assignee: Individual
Current assignee: Southern Theater Command General Hospital of PLA
Priority date: 2020-01-16
Filing date: 2020-01-16
Publication date: 2020-10-09
Anticipated expiration: 2030-01-16

Abstract

The utility model provides an extensive region dentata dislocation way of escape restorer with digging arm, its characterized in that: the device comprises a clamp-shaped limiting frame, wherein the clamp-shaped limiting frame is provided with a first support and a second support, the first support and the second support are in cross connection at the intersection point of the middle parts, and a supporting arm for supporting, propelling and resetting is installed at the head end of the first support; the head end of the second bracket is provided with a clamping arm for clamping and clamping the posterior arch of the atlas; when resetting, both usable activity support arm forward passes the axis and resets, and it draws the atlas backward to utilize clamp arm centre gripping atlas posterior arch to reset to do, perhaps carries out the drawing of clamp arm when the support arm pushes forward and carries out the cooperation and resets, can provide extra strength that resets, and control that can be accurate reset the distance, solved among the prior art that the back is not enough to reset the strength, reset the operation difficulty and the not good problem of effect that resets, still can be used to the reposition of other vertebra dislocation except that the atlantoaxial dislocation simultaneously.

Description

Atlantoaxial dislocation posterior repositor with movable arm

Technical Field

The utility model relates to the field of medical equipment, in particular to an atlantoaxial dislocation posterior restorer with a movable arm.

Background

At atlantoaxial, cervical vertebra, lumbar vertebrae etc, when needing to reset owing to dislocation or slippage, can adopt back way vertebral arch screw fixed rod reset system usually, however, above this kind carry out the centrum through the nail stick is fixed and resets, mainly rely on the pulling effect of nail stick to realize resetting, because the pulling of nail stick system is reset strength limited, often need increase the pre-curved radian of fixed stick in order to increase the strength that resets, but need the stick operation of trading repeatedly in order to realize satisfied reseing, but this method is difficult accurate control reset distance. In addition, even if the rod is bent and replaced repeatedly, the increased restoring force may not be sufficient to overcome the restoring resistance, and it is not uncommon to cause poor restoration. Thus, providing additional restoring force beyond that inherent in the rod and nail fixation system will facilitate reduction of atlantoaxial dislocation and the like.

SUMMERY OF THE UTILITY MODEL

The utility model provides an extensive region epistropheus dislocation way of escape restorer with digging arm has solved prior art in the way of escape strength not enough, the operation difficulty that resets and the not good problem of effect that resets.

The technical scheme of the utility model is realized like this: an atlantoaxial dislocation posterior restorer with a movable arm is provided with a clip-shaped limiting frame, the clip-shaped limiting frame is provided with a first support and a second support, the first support and the second support are in cross connection at a middle intersection point, the head end of the first support is provided with a support arm for supporting and pushing for restoration, the support arm comprises a support rod, a first movable rod movably connected with the support rod, and a first fixed pipe sleeved on a connecting part of the support rod and the first movable rod, and the first fixed pipe is fixedly arranged at the first section of the first support; a clamping arm for clamping the rear bow is installed at the head end of the second support, the clamping arm comprises a clamping hand part, a second movable rod movably connected with the clamping hand part, and a second fixed pipe sleeved on the connecting part of the clamping hand part and the second movable rod, and the second fixed pipe is fixedly installed at the head end of the second support; the tail ends of the first bracket and the second bracket are used as handle ends.

Preferably, the head end of the first bracket is bent at a certain angle alpha relative to the first bracket; correspondingly, the head end of the second bracket is bent at a certain angle beta relative to the second bracket; preferably, the bending direction of the head end of the first bracket is the same as that of the head end of the second bracket; preferably, α or β is in the range of 45 ° -180 °; more preferably, α ═ β.

Preferably, the support rod comprises a support part for supporting and a first connecting rod for connecting the first movable rod, the support part is connected with the head end of the first connecting rod, and the first movable rod is connected with the tail end of the first connecting rod; the first fixed pipe is sleeved on the first movable rod and the first connecting rod and used for limiting the moving direction of the first movable rod and the first connecting rod; the supporting part is provided with an arc concave surface for avoiding the spinous process of the epistropheus so that the supporting part can avoid the interference of the spinous process of the epistropheus and can support and push forwards on the vertebral arch plate;

a limiting structure is arranged between the first connecting rod and the first fixed pipe to limit the first connecting rod to rotate in the first fixed pipe;

the limit structure of the first connecting rod and the first fixed pipe is as follows: at least one thread through hole is formed in one side of the first connecting rod, and after the screw is screwed into the thread through hole through the first visual area, the first connecting rod is limited to rotate in the first fixing pipe through the clamping position of the screw by the first visual area.

Preferably, the tail end of the first connecting rod is provided with a first concave cavity; the first movable rod is provided with a first screw rod used for screwing in the first fixed pipe, the head end of the first screw rod is provided with a first clamping end which is matched with the first cavity and used for clamping the first cavity, the head end of the first screw rod is movably connected with the tail end of the first connecting rod through the matching of the first clamping end and the first cavity, the tail end of the first screw rod is provided with a first nut used for rotating the first movable rod, the first screw rod is driven to rotate through the first nut, the first movable rod is made to move in the first fixed pipe in a screwing-in or screwing-out mode, and therefore the first connecting rod drives the supporting part to move forwards.

Preferably, the clamping part comprises a clamping head for clamping the atlas posterior arch, an adjusting piece for adjusting the tightness of the clamping head and a second connecting rod for connecting a second movable rod, the clamping head is connected with the head end of the second connecting rod, and the second movable rod is connected with the tail end of the second connecting rod; the second fixed pipe is sleeved on the second movable rod and the second connecting rod and used for limiting the moving direction of the second movable rod and the second connecting rod; the adjusting piece is matched with the chuck to clamp the posterior arch of the atlas, and the second movable rod drives the chuck to pull back through the second connecting rod;

a limiting structure is arranged between the second connecting rod and the second fixed pipe to limit the second connecting rod to rotate in the second fixed pipe;

the second connecting rod is with the limit structure of the fixed pipe of second: the second connecting rod is provided with a first limiting plane, a cavity which is matched with the cross section of the second connecting rod is arranged in the second fixing pipe, the cavity is provided with a second limiting plane, and the second connecting rod is limited to rotate in the second fixing pipe after the first limiting plane and the second limiting plane are attached.

Preferably, the tail end of the second connecting rod is provided with a second concave cavity; the second movable rod is provided with a second screw rod used for screwing a second fixed pipe, the head end of the second screw rod is provided with a second clamping end which is matched with the second concave cavity and is used for clamping the second concave cavity, and the head end of the second screw rod is movably connected with the tail end of the second connecting rod through the matching of the second clamping end and the second concave cavity; a second nut used for rotating the second movable rod is arranged at the tail end of the second screw rod; the second screw rod is driven to rotate through the second screw cap, so that the second movable rod moves in or out of the second fixed pipe in a screwing mode, and the clamping head is driven to pull back through the second connecting rod.

Preferably, the chuck comprises two open clamping hands, the roots of the two clamping hands are fixedly connected with the second connecting rod, a plurality of sawteeth are arranged at the front ends of the clamping hands, and the heights of the sawteeth are sequentially reduced from the front ends to the rear ends of the clamping hands.

Preferably, the head end of the second connecting rod is provided with a fixing part which is used for fixing the adjusting piece at different positions of the clamping arm so as to adjust the opening degree of the two clamping hands; the fixing part is of an external thread structure, the adjusting piece comprises a rotating end and a clamping end for clamping the clamping hand, the rotating end is provided with an internal thread which can be screwed into the external thread structure, and the adjusting piece can move relative to the second connecting rod by adjusting the rotating end; the clamping end is designed to be hollow, and when the adjusting piece moves on the second connecting rod, the clamping end extrudes the clamping hands, so that the opening degree of the two clamping hands is adjusted.

Preferably, the first fixed pipe is also provided with a first visible area and a first scale for observing the moving distance of the first movable rod; the second fixed pipe is also provided with a second visual area and a second scale for observing the moving distance of the second movable rod.

Preferably, a limiting device is arranged between the handle end of the first support and the handle end of the second support, the limiting device comprises a third screw and two limiting nuts, and one end of the third screw is fixed on the handle end of the second support through a connecting piece; correspondingly, the through hole is formed in the handle end of the first support, the other end of the third screw rod sequentially penetrates through the first limiting nut, the through hole and the second limiting nut, the position of the handle end of the first support on the third screw rod is limited through the two limiting nuts, and therefore the limiting effect is achieved on the distance between the two handle ends.

The utility model has the advantages that the utility model has simple reset operation, can provide extra reset force, can accurately control the reset distance, and solves the problems of insufficient reset force, difficult reset operation and poor reset effect in the prior art; when resetting, force application resetting can be performed through the supporting arm, or force application resetting can be performed through the clamping arm, or the supporting arm and the clamping arm simultaneously apply force to reset; the two arms can be adjusted to reset, so that the practicability is greatly improved, and the surgical instrument can adapt to various complex surgical conditions.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a schematic structural view of the atlantoaxial dislocation posterior repositor with a movable arm of the present invention;

fig. 2 is a schematic structural view of the support arm of the present invention;

FIG. 3 is a schematic structural view of the support rod of the present invention;

fig. 4 is a schematic structural view of the first movable rod of the present invention;

fig. 5 is a schematic structural view of a first fixed pipe of the present invention;

FIG. 6 is a schematic view of the structure of the clamping arm of the present invention;

FIG. 7 is a schematic structural view of the hand clamp of the present invention;

fig. 8 is a schematic structural view of a second movable rod of the present invention;

fig. 9 is a schematic structural view of a second fixing tube according to the present invention;

fig. 10 is a schematic view showing the fixation and displacement of the clamping arm and the supporting arm in the reduction of the dislocated vertebra.

1 a first support; 2 a first stationary tube; 234 supporting the arm; 678 gripping arms; 21 a first viewable area; 22 a first scale; 3 a first movable bar; 31 a first card input end; 32 a first screw; 33 a first nut; 4, supporting rods; 41 a first connecting rod; 411 a first cavity; 412 a threaded through hole; 42 a support part; 421 an arc concave surface; 5 a second support; 6 a second fixed tube; 61 a second limit plane; 62 a cavity; 63 a second scale; 64 a second viewable area; 7 a second movable bar; 71 a second card input end; 72 a second screw; 73 a second nut; 8, clamping the hand part; 81, a chuck; 811 serration; 82 an adjustment member; 821 a rotating end; 822 a clamping end; 83 a fixing part; 84 a second cavity; 85 a first limit plane; 86 a second connecting rod; 9 a handle end; 91 a third screw; 92 a first stop nut; 93 second stop nut.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1-10, an atlantoaxial dislocation posterior restorer with a movable arm comprises a clip-shaped limiting frame, the clip-shaped limiting frame comprises a first bracket 1 and a second bracket 5, the first bracket 1 and the second bracket 5 are in cross connection at a middle intersection point, a supporting arm 234 for supporting and pushing to restore is arranged at the head end of the first bracket 1, the supporting arm 234 comprises a supporting rod 4, a first movable rod 3 movably connected with the supporting rod 4, and a first fixed pipe 2 sleeved at the connecting part of the supporting rod 4 and the first movable rod 3, and the first fixed pipe 2 is fixedly arranged at the first section of the first bracket 1; the supporting arm 234 can be used as a supporting point for vertebra reduction, can also be used as a propelling arm for propelling vertebra reduction, is not limited to a single using method, is flexible and changeable, and can be better suitable for complex operation conditions.

A clamping arm 678 used for clamping the posterior arch of the atlas is installed at the head end of the second support 5, the clamping arm 678 comprises a clamping hand part 8, a second movable rod 7 movably connected with the clamping hand part 8, and a second fixed pipe 6 sleeved on the connecting part of the clamping hand part 8 and the second movable rod 7, and the second fixed pipe 6 is fixedly installed at the head end of the second support 5; the tail ends of the first bracket 1 and the second bracket 5 are used as handle ends 9.

According to the atlantoaxial dislocation posterior repositor with the movable arm, the first bracket 1 and the first fixing tube 2 as well as the second bracket 5 and the second fixing tube 6 are of an integrated structure, the integrated structure is stressed more uniformly, and the stability in the use process is improved; the first fixed pipe 2 is also provided with a first visible area 21 and a first scale 22 for observing the moving distance of the first movable rod 3; the second fixed pipe 6 is also provided with a second visual area 64 and a second scale 63 for observing the moving distance of the second movable rod 7.

Further, the head end of the first bracket 1 is bent at a certain angle α relative to the first bracket 1, and correspondingly, the head end of the second bracket 5 is bent at a certain angle β relative to the second bracket 5; the bending direction of the head end of the first bracket 1 is the same as that of the head end of the second bracket 5; preferably, α or β is in the range of 45 ° -180 °; preferably, α ═ β; due to the fact that the operation habits of doctors are different or the operation scenes are different, and the like, different support bending angles can meet different requirements.

The handle end 9 of the first support 1 and the handle end 9 of the second support 5 are handheld parts in the using process, a limiting device is arranged between the handle ends 9 and comprises a second screw 72 and two limiting nuts, one end of the second screw 72 is fixed on the handle end 9 of the second support 5 through a connecting piece, correspondingly, a through hole is formed in the handle end 9 of the first support 1, the other end of the second screw 72 sequentially penetrates through the limiting nuts, the through hole and the other limiting nut, the two limiting nuts are rotated to the two ends of the handle end 9 of the first support 1, the handle end 9 of the first support 1 is limited and moved, the handle end 9 of the first support 1 is limited at different positions on the third screw 91, and therefore the opening distance between the first support 1 and the second support 5 is controlled.

Further, the support rod 4 comprises a support portion 42 for supporting and a first connecting rod 41 for connecting the first movable rod 3, the support portion 42 is connected with the head end of the first connecting rod 41, and the first movable rod 3 is connected with the tail end of the first connecting rod 41; the first fixed pipe 2 is sleeved on the first movable rod 3 and the first connecting rod 41 and used for limiting the moving direction of the first movable rod 3 and the first connecting rod 41;

furthermore, the supporting portion 42 is provided with an arc concave surface 421 for avoiding the spinous process of the axis, the concave depth of the arc concave surface 421 is deeper than the height of the spinous process protruding out of the articular process or the lateral mass, so as to ensure that the arc concave surface 421 completely covers the spinous process, so that the supporting portion 42 can avoid the interference of the spinous process of the axis and support on the articular process or the lateral mass, wherein the shape of the supporting portion 42 can be square or circular arc, etc.;

a limiting structure is arranged between the first connecting rod 41 and the first fixed pipe 2 to limit the first connecting rod 41 to rotate in the first fixed pipe 2;

the limiting structure between the first connecting rod 41 and the first fixing pipe 2 is as follows: at least one screw through hole 412, which may be a plurality of screw through holes, is formed in one side of the first connecting rod 41, and if a plurality of screw through holes are used for screwing screws into different screw through holes 412 according to different pushing distances, after the screws are screwed into the screw through holes 412 through the first visual area 21, the screws are limited to be incapable of rotating in the first fixing pipe 2 through the clamping position of the screws by the opening shape of the first visual area 21; the limiting structure is simple and the production difficulty is low.

Further, a first cavity 411 is formed at the end of the first connecting rod 41; the first movable rod 3 has a first screw 32 for screwing in the first fixed pipe 2, the head end of the first screw 32 is provided with a first clamping end 31 adapted to the first cavity 411 and used for clamping into the first cavity 411, the head end of the first screw 32 is movably connected with the tail end of the first connecting rod 41 through the matching of the first clamping end 31 and the first cavity 411, the tail end of the first screw 32 is provided with a first nut 33 for rotating the first movable rod 3, the first nut 33 drives the first screw 32 to rotate, so that the first movable rod 3 is screwed in or out of the first fixed pipe 2, and the first connecting rod 41 drives the supporting part 42 to perform forward pushing action.

Further, the clamping hand part 8 comprises a clamping head 81 for clamping the atlas posterior arch, an adjusting piece 82 for adjusting the tightness of the clamping head 81 and a second connecting rod 86 for connecting the second movable rod 7, the clamping head 81 is connected with the head end of the second connecting rod 86, and the second movable rod 7 is connected with the tail end of the second connecting rod 86; the second fixed pipe 6 is sleeved on the second movable rod 7 and the second connecting rod 86 and used for limiting the moving directions of the second movable rod 7 and the second connecting rod 86; the adjusting piece 82 is matched with the clamping head 81 to clamp the atlas posterior arch, and the second movable rod 7 drives the clamping head 81 to pull back through the second connecting rod 86;

a limiting structure is arranged between the second connecting rod 86 and the second fixed pipe 6 to limit the second connecting rod 86 to rotate in the second fixed pipe 6;

the limit structure of the second connecting rod 86 and the second fixing tube 6 is: the second connecting rod 86 is provided with a first limiting plane 85, a cavity 62 which is consistent with the cross section of the second connecting rod 86 is arranged in the second fixing tube 6, the cavity 62 is provided with a second limiting plane 61, and the second connecting rod 86 is limited to rotate in the second fixing tube 6 after the first limiting plane 85 is attached to the second limiting plane 61.

Further, a second cavity 84 is formed at the tail end of the second connecting rod 86; the second movable rod 7 is provided with a second screw 72 for screwing the second fixed pipe 6, the head end of the second screw 72 is provided with a second clamping end 71 which is matched with the second cavity 84 and is used for clamping the second cavity 84, and the head end of the second screw 72 is movably connected with the tail end of a second connecting rod 86 through the matching of the second clamping end 71 and the second cavity 84; the end of the second screw 72 is provided with a second nut 73 for rotating the second movable rod 7; the second screw 72 is driven to rotate by the second nut 73, so that the second movable rod 7 moves in and out of the second fixed pipe 6, and the chuck 81 is driven to pull back by the second connecting rod 86; the reset operation can be carried out at a longer distance by the extension mode, the operation difficulty is reduced, and meanwhile, extra reset force is provided for the back-pull reset.

Furthermore, the root connecting ends of the two clamping hands are fixedly connected with the end parts of the arms in the clamping arms 678, the front ends of the clamping hands are provided with a plurality of saw teeth 811, and the height of each saw tooth 811 is sequentially reduced from the front end to the rear end of each clamping hand, so that the saw teeth 811 form a gradient shape; if the saw teeth 811 are at the same height, the sliding teeth are easy to occur during the posterior drawing process because the thicknesses of the upper and lower edges of the atlas posterior arch are different, and the atlas posterior arch can be better gripped by the gradient saw teeth 811 with a high anterior part and a low posterior part, so that the sliding during the posterior drawing action during the resetting process is prevented.

Further, the head end of the second connecting rod 86 is provided with a fixing portion 83, and the fixing portion 83 is used for fixing the adjusting member 82 to different positions of the clamping arm 678, so as to adjust the opening degree of the two clamping hands; the fixing portion 83 is of an external thread structure, the adjusting element 82 comprises a rotating end 821 and a clamping end 822 for clamping a clamping hand, the rotating end 821 is provided with an internal thread which can be screwed into the external thread structure, and the adjusting rotating end 821 can enable the adjusting element 82 to move relative to the second connecting rod 86; the clamping end 822 is hollow, and when the adjusting piece 82 moves on the second connecting rod 86, the clamping end 822 extrudes the clamping hands, so that the opening degree of the two clamping hands is adjusted; the thread adjustment can sense the tightness of the hand clamp by adjusting the rotating end 821, so as to prevent the hand clamp from being too tight or too loose to influence the operation process; the screw adjustment allows fine adjustment, unlike the detent-type fixation method, which only allows adjustment of the distance of one detent at a time.

When in specific use: observing the positional relationship of the dislocated atlas and the epistropheus, adjusting the handle end 9 to enable the distance between the clamping arm 678 and the supporting arm 234 to be matched with the distance between the atlas and the epistropheus, after adjusting the distance between the clamping arm 678 and the supporting arm 234, screwing two limiting nuts to two sides of the handle end 9 of the first bracket 1 to fix the first bracket 1, and screwing a screw into the threaded through hole 412 through the first visible area 21 to limit the rotation of the first connecting rod 41 in the first fixing tube 2; then the handle end 9 is held by hand to enable the clamping arm 678 to go deep into the dislocated atlas posterior arch, the opening degree between the two clamping hands is reduced by adjusting the rotating end 821, so that the two clamping hands bite the atlas posterior arch, then the first nut 33 of the first movable rod 3 is rotated to enable the first movable rod 3 to move in the first fixed tube 2, the supporting part 42 is driven to push forwards, the arc concave surface 421 corresponds to the spinous process of the epistrophium, the supporting legs at the two sides are arranged at the spinous process or the side block for supporting, then the first nut 33 is rotated, the epistrophium can be pushed forwards to generate restoring force, so that the atlas generates relative motion, namely, the epistrophium is pushed forwards directly, the atlas is pulled backwards indirectly to achieve the effect of restoration, and meanwhile, the restoring distance can be controlled through a visible area; after the reduction is completed, the rotating end 821 is adjusted to increase the opening degree between the two clamping hands, so that the atlantoaxial dislocation posterior reduction device with the movable supporting arm 234 can be taken out by holding the handle end 9.

Another use case is: similar to the above-mentioned use cases, the atlas and the epistropheus corresponding to the support arm 234 and the clamp arm 678 are positioned, and the reset operation can be performed by using the clamp arm 678 without using the support arm 234; the second nut 73 of the second movable rod 7 is rotated to move the second movable rod 7 in the second fixed tube 6, and the grip 8 is driven to be pulled back and forth for resetting.

A third use case: similarly to the above-mentioned use case, the atlas and the epistropheus corresponding to the support arm 234 and the clamp arm 678 are positioned correspondingly, and the support arm 234 and the clamp arm 678 are used for resetting; the first nut 33 of rotatory first movable rod 3 makes first movable rod 3 remove in first fixed pipe 2, drives supporting part 42 and pushes forward and pass the operation that resets, and the second nut 73 of rotatory second movable rod 7 makes second movable rod 7 remove in second fixed pipe 6 simultaneously, drives the operation that the pulling resets around the drive tong portion 8 carries out, effort greatly increased the strength that resets in the time of can two arms hand.

The utility model has the advantages that the utility model has simple reset operation, can provide extra reset force, can accurately control the reset distance, and solves the problems of insufficient reset force, difficult reset operation and poor reset effect in the prior art; when resetting is performed, force application resetting can be performed through the supporting arm 234, or force application resetting can be performed through the clamping arm 678, or resetting operation can be performed through the supporting arm 234 and the clamping arm 678 at the same time; the two arms can be adjusted to reset, so that the practicability is greatly improved, and the surgical instrument can adapt to various complex surgical conditions.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides an atlantoaxial dislocation back way restorer with digging arm which characterized in that: the device is provided with a clamp-shaped limiting frame, the clamp-shaped limiting frame is provided with a first support and a second support, the first support and the second support are in cross connection at a middle intersection point, a supporting arm for supporting and propelling to reset is installed at the head end of the first support, the supporting arm comprises a supporting rod, a first movable rod movably connected with the supporting rod, and a first fixed pipe sleeved on a connecting part of the supporting rod and the first movable rod, and the first fixed pipe is fixedly installed at the first section of the first support; the head end of the second support is provided with a clamping arm for clamping spinous processes, the clamping arm comprises a clamping hand part, a second movable rod movably connected with the clamping hand part, and a second fixed pipe sleeved on the connecting part of the clamping hand part and the second movable rod, and the second fixed pipe is fixedly arranged at the head end of the second support; the tail ends of the first bracket and the second bracket are used as handle ends.

2. The atlantoaxial dislocation posterior repositor with a movable arm of claim 1, wherein: the head end of the first bracket is bent at a certain angle alpha relative to the first bracket; correspondingly, the head end of the second bracket is bent at a certain angle beta relative to the second bracket; the bending direction of the head end of the first support is the same as that of the head end of the second support; the value range of the alpha or the beta is 45-180 degrees; the α ═ β.

3. The atlantoaxial dislocation posterior repositor with a movable arm of claim 1, wherein: the supporting rod comprises a supporting part for supporting and a first connecting rod for connecting the first movable rod, the supporting part is connected with the head end of the first connecting rod, and the first movable rod is connected with the tail end of the first connecting rod; the first fixed pipe is sleeved on the first movable rod and the first connecting rod and used for limiting the moving direction of the first movable rod and the first connecting rod; the supporting part is provided with an arc concave surface for avoiding the spinous process of the epistropheus, so that the supporting part can avoid the interference of the spinous process of the epistropheus and can support and push forwards on the vertebral arch plate;

a limiting structure is arranged between the first connecting rod and the first fixed pipe, and the first connecting rod is limited to rotate in the first fixed pipe.

4. The atlantoaxial dislocation posterior repositor with a movable arm of claim 3, wherein: the tail end of the first connecting rod is provided with a first concave cavity; first movable rod has and is used for the twist first screw rod of first fixed pipe, first screw rod head end be equipped with first cavity looks adaptation just is used for the card to go into the first card of first cavity and enters the end, through the cooperation of first card entering end and first cavity, with first screw rod head end and the terminal swing joint of head rod, first screw rod end is equipped with the first nut that is used for rotatory first movable rod, and it is rotatory to drive first screw rod through first nut, makes first movable rod be in do the precession or the removal of precession in the first fixed pipe, thereby pass through the head rod drives the supporting part is done and is pushed forward the action.

5. The atlantoaxial dislocation posterior repositor with a movable arm of claim 1, wherein: the clamping hand part comprises a clamping head for clamping the atlas posterior arch, an adjusting piece for adjusting the tightness of the clamping head and a second connecting rod for connecting the second movable rod, the clamping head is connected with the head end of the second connecting rod, and the second movable rod is connected with the tail end of the second connecting rod; the second fixed pipe is sleeved on the second movable rod and the second connecting rod and used for limiting the moving direction of the second movable rod and the second connecting rod; the adjusting piece is matched with the chuck to clamp the posterior arch of the atlas, and the second movable rod drives the chuck to pull backwards through the second connecting rod;

and a limiting structure is arranged between the second connecting rod and the second fixing pipe to limit the second connecting rod to rotate in the second fixing pipe.

6. The atlantoaxial dislocation posterior repositor with a movable arm of claim 5, wherein: the tail end of the second connecting rod is provided with a second concave cavity; the second movable rod is provided with a second screw rod used for screwing the second fixed pipe, the head end of the second screw rod is provided with a second clamping end which is matched with the second cavity and is used for clamping the second cavity, and the head end of the second screw rod is movably connected with the tail end of the second connecting rod through the matching of the second clamping end and the second cavity; a second nut used for rotating the second movable rod is arranged at the tail end of the second screw rod; the second screw rod is driven to rotate through the second screw cap, so that the second movable rod moves in the second fixed pipe in a screwing-in or screwing-out mode, and the clamping head part is driven to pull back through the second connecting rod.

7. The atlantoaxial dislocation posterior repositor with a movable arm of claim 5, wherein: the chuck includes two open tong, the root of two tong with second connecting rod fixed connection, the front end of tong is equipped with a plurality of sawtooth, the height of sawtooth is reduced in proper order by the front end to the rear end of tong.

8. The atlantoaxial dislocation posterior repositor with a movable arm of claim 5, wherein: the head end of the second connecting rod is provided with a fixing part which is used for fixing the adjusting piece at different positions of the clamping arm so as to adjust the opening degree of the two clamping hands; the fixing part is of an external thread structure, the adjusting piece comprises a rotating end and a clamping end for clamping the clamping hand, the rotating end is provided with an internal thread which can be screwed into the external thread structure, and the adjusting piece can move relative to the second connecting rod by adjusting the rotating end; the clamping end is hollow, and when the adjusting piece moves on the second connecting rod, the clamping end extrudes the clamping hands so as to adjust the opening degree of the two clamping hands.

9. The atlantoaxial dislocation posterior repositor with a movable arm of claim 1, wherein: the first fixed pipe is also provided with a first visible area and a first scale for observing the moving distance of the first movable rod; and a second visual area and second scales for observing the moving distance of the second movable rod are also arranged on the second fixed pipe.

10. The atlantoaxial dislocation posterior repositor with a movable arm of claim 1, wherein: a limiting device is arranged between the handle end of the first support and the handle end of the second support, the limiting device comprises a third screw and two limiting nuts, and one end of the third screw is fixed on the handle end of the second support through a connecting piece; correspondingly, the through hole is formed in the first support handle end, the other end of the third screw rod sequentially penetrates through the first limiting nut, the through hole and the second limiting nut, the position of the first support handle end on the third screw rod is limited through the two limiting nuts, and therefore the limiting effect is achieved on the distance between the two handle ends.