WO2021143807A1

WO2021143807A1 - Atlantoaxial dislocation posterior repositor having moving arms

Info

Publication number: WO2021143807A1
Application number: PCT/CN2021/072037
Authority: WO
Inventors: 马向阳
Original assignee: 中国人民解放军南部战区总医院
Priority date: 2020-01-16
Filing date: 2021-01-15
Publication date: 2021-07-22

Abstract

An atlantoaxial dislocation posterior repositor having moving arms. The posterior repositor is characterized by: being provided with a limiting frame in a clamp shape. The clamp-shaped limiting frame is provided with a first support (1) and a second support (5); the first support (1) and the second support (5) are connected in a crossed manner at a middle intersection point; supporting arms (2, 3, 4) used for supporting and reposition promoting are mounted at the head end of the first support (1); clamping arms (6, 7, 8) used for clamping a posterior arch of atlas are mounted at the head end of the second support (5). During reposition, the moving supporting arms (2, 3, 4) can be utilized to push an atlantoaxial joint forward for reposition, and the clamping arms (6, 7, 8) can also be utilized to clamp the posterior arch of atlas to lift an atlas backward for reposition, or lifting of the clamping arms (6, 7, 8) is performed while the supporting arms (2, 3, 4) are pushed forwards to perform synergic reposition, extra reposition power can be provided, a reposition distance can be accurately controlled, and the problems in the prior art that posterior reposition power is insufficient, a reposition operation is difficult, and a reposition effect is poor are solved; moreover, the repositor can further be used for reposition of other dislocated vertebrae in addition to atlantoaxial dislocation.

Description

A posterior reducer for atlantoaxial dislocation with movable arms

Technical field

The invention relates to the field of medical devices, in particular to a posterior reducer for atlantoaxial dislocation with movable arms.

Background technique

In the atlantoaxial, cervical, lumbar spine, etc., when reduction is required due to dislocation or spondylolisthesis, the posterior pedicle screw fixation rod reduction system is usually used. However, the above-mentioned vertebral body reduction through nail rod fixation mainly depends on nails. The rod's pulling action can realize the reset. Due to the limited pulling force of the nail-rod system, it is often necessary to increase the pre-bending arc of the fixed rod to increase the reset force. However, repeated rod replacement operations are required to achieve satisfactory reset. However, this method is very It is difficult to accurately control the reset distance. In addition, even if the rod is repeatedly bent and replaced, the increased reset force may not be enough to overcome the reset resistance, and it is not uncommon to cause poor reset. Therefore, if an additional reduction force can be provided in addition to the inherent reduction force of the nail and rod fixation system, it will be helpful for the reduction of atlantoaxial dislocation.

Summary of the invention

The present invention provides a posterior reducer for atlantoaxial dislocation with a movable arm, which solves the problems of insufficient posterior reduction force, difficult reduction operation and poor reduction effect in the prior art.

The technical scheme of the present invention is realized as follows: a posterior reducer for atlantoaxial dislocation with a movable arm has a clip-shaped limit frame, and the clip-shaped limit frame has a first bracket and a second bracket. A bracket and a second bracket are cross-connected at the intersection of the middle. The head end of the first bracket is equipped with a support arm for supporting and pushing and resetting. The support arm includes a support rod. The first movable rod movably connected to the support rod is sleeved on the support. The first fixed tube of the connecting part of the rod and the first movable rod, the first fixed tube is fixedly installed on the first section of the first bracket; the first end of the second bracket is installed with a clamping arm for clamping the rear bow, the clamping arm includes a clamping hand, The second movable rod movably connected with the gripping part is sleeved on the second fixed tube of the connecting part of the gripping part and the second movable rod, and the second fixed tube is fixedly installed at the head end of the second bracket; the first bracket and the second bracket The tail end of the bracket serves as the handle end.

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

Preferably, the supporting rod includes a supporting part for supporting and a first connecting rod for connecting the first movable rod, the supporting part is connected with the first end of the first connecting rod, and the first movable rod is connected with the end of the first connecting rod; A fixed tube is sleeved on the first movable rod and the first connecting rod to limit the direction of movement of the first movable rod and the first connecting rod; the support part is provided with an arc concave surface for avoiding the spinous process of the pivot, so that The support part can avoid the interference of the spinous process of the axis, and support and push forward on the vertebral arch plate;

A limit structure is provided between the first connecting rod and the first fixed tube to limit the rotation of the first connecting rod in the first fixed tube;

The limiting structure of the first connecting rod and the first fixed pipe is: at least one threaded through hole is provided on one side of the first connecting rod, and after the screw is screwed into the threaded through hole through the first visible area, The locking position of the screw restricts the rotation of the first connecting rod in the first fixed tube.

Preferably, the end of the first connecting rod is provided with a first cavity; the first movable rod has a first screw for screwing into the first fixed tube, and the first end of the first screw is equipped with a first cavity that is adapted and used. At the first clamping end that is clamped into the first cavity, the first clamping end and the first cavity are matched to movably connect the first end of the first screw rod with the end of the first connecting rod, and the end of the first screw is provided with Rotate the first nut of the first movable rod, and drive the first screw to rotate through the first nut, so that the first movable rod is moved in or out of the first fixed tube, so that the support part is driven by the first connecting rod Make a forward push.

Preferably, the gripping part includes a chuck for clamping the posterior arch of the atlas, an adjusting member for adjusting the tightness of the chuck, and a second connecting rod for connecting the second movable rod, the chuck and the second connecting rod The first end is connected, and the second movable rod is connected with the end of the second connecting rod; the second fixed tube is sleeved on the second movable rod and the second connecting rod, and is used to restrict the movement direction of the second movable rod and the second connecting rod; The adjusting member cooperates 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 limit structure is provided between the second connecting rod and the second fixed tube to restrict the second connecting rod from rotating in the second fixed tube;

The limiting structure of the second connecting rod and the second fixed tube is: the second connecting rod is provided with a first limiting plane, the second fixed tube is provided with a cavity corresponding to the cross section of the second connecting rod, and the cavity is provided with a first limiting plane. Two limiting planes, the first limiting plane and the second limiting plane are attached to restrict the second connecting rod from rotating in the second fixed tube.

Preferably, the end of the second connecting rod is provided with a second cavity; the second movable rod has a second screw for screwing into the second fixed tube, and the head end of the second screw is provided with a second cavity that is adapted and used. At the second clamping end that is clamped into the second cavity, the first end of the second screw rod and the end of the second connecting rod are movably connected through the cooperation of the second clamping end and the second cavity; the end of the second screw rod is provided for Rotate the second nut of the second movable rod; the second screw cap drives the second screw to rotate, so that the second movable rod can be screwed in or out in the second fixed tube, so that the chuck is driven by the second connecting rod Pull the action after the part is made.

Preferably, the chuck includes two open gripping hands, the roots of the two gripping hands are fixedly connected to the second connecting rod, and the front end of the gripping hand is provided with several serrations, and the height of the serrations is sequentially from the front end to the rear end of the gripping arm. reduce.

Preferably, the first end of the second connecting rod is provided with a fixing part, and the fixing part is used to fix the adjusting member at different positions of the clamping arm to adjust the opening degree of the two clamping hands; the fixing part is an external thread structure, and the adjusting member includes a rotating end And the clamping end used to clamp the gripper, the rotating end is provided with an internal thread that can be screwed into the external thread structure, and adjusting the rotating end can make the adjustment piece move relative to the second connecting rod; the clamping end is a hollow design, and the adjustment piece is in the When the second connecting rod moves upward, the clamping end squeezes the gripping hands to adjust the opening degree of the two gripping hands.

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

Preferably, a limiting device is provided between the handle end of the first bracket and the handle end of the second bracket. The limiting device includes a third screw and two limiting nuts. One end of the third screw is fixed to the second bracket through a connecting piece. Correspondingly, the handle end of the first bracket is provided with a through hole, and the other end of the third screw thread passes through the first limit nut, the through hole and the second limit nut in sequence, and the second limit nut is defined by the two limit nuts. The position of the handle end of a bracket on the third screw rod has a limit effect on the distance between the two handle ends.

The present invention has the following advantages. The reset operation of the present invention is simple, can provide additional reset force, can accurately control the reset distance, and solve the problems of insufficient rear reset force, difficult reset operation and poor reset effect in the prior art; When resetting, you can choose to apply force reset through the support arm, or you can choose to apply force reset through the clamp arm, or the support arm and the clamp arm apply force at the same time to reset; both arms can be adjusted for reset operation, greatly Increased practicability, can adapt to a variety of complex surgical conditions.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor.

Figure 1 is a schematic structural diagram of a posterior reducer for atlantoaxial dislocation with movable arms according to the present invention;

Figure 2 is a schematic diagram of the structure of the support arm of the present invention;

Figure 3 is a schematic diagram of the structure of the support rod of the present invention;

4 is a schematic diagram of the structure of the first movable rod of the present invention;

Fig. 5 is a schematic diagram of the structure of the first fixed pipe of the present invention;

Figure 6 is a schematic diagram of the structure of the clamping arm of the present invention;

Figure 7 is a schematic diagram of the structure of the gripping part of the present invention;

FIG. 8 is a schematic diagram of the structure of the second movable rod of the present invention;

Figure 9 is a schematic view of the structure of the second fixed pipe of the present invention;

Figure 10 is a schematic diagram of the fixation and displacement of the dislocated vertebrae when the clamp arm and the support arm are reset.

1 first bracket; 2 first fixed tube; 234 support arm; 678 clamp arm; 21 first visible area; 22 first scale; 3 first movable rod; 31 first locking end; 32 first screw; 33 first nut; 4 supporting rod; 41 first connecting rod; 411 first cavity; 412 threaded through hole; 42 supporting part; 421 curved concave surface; 5 second bracket; 6 second fixing tube; 61 second Limiting plane; 62 cavity; 63 second scale; 64 second visible area; 7 second movable rod; 71 second clamping end; 72 second screw rod; 73 second nut; 8 gripping part; 81 Chuck; 811 serrated; 82 adjusting member; 821 rotating end; 822 locking end; 83 fixed part; 84 second cavity; 85 first limit plane; 86 second connecting rod; 9 handle end; 91 third screw ; 92 the first limit nut; 93 the second limit nut.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

As shown in Figure 1-10, a posterior reducer for atlantoaxial dislocation with movable arms has a clip-shaped limit frame. The clip-shaped limit frame has a first bracket 1 and a second bracket 5. A bracket 1 and a second bracket 5 are cross-connected at the middle intersection. The first bracket 1 is equipped with a supporting arm 234 for supporting and pushing and resetting. The supporting arm 234 includes a supporting rod 4 and a first movably connected to the supporting rod 4 The movable rod 3 is a first fixed tube 2 sleeved on the connecting part of the supporting rod 4 and the first movable rod 3. The first fixed tube 2 is fixedly installed in the first section of the first bracket 1; the supporting arm 234 can be used as a support point for vertebral reduction It plays a supporting role and can also be used as a propulsion arm to advance the reduction of vertebrae. It is not limited to a single method of use, and is flexible and can better adapt to complex surgical conditions.

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

In the posterior reducer for atlantoaxial dislocation with movable arms, the first stent 1 and the first fixed tube 2, the second stent 5 and the second fixed tube 6 are an integrated structure, the integrated structure is more uniformly stressed, and the use process is increased The first fixed tube 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 tube 6 is also provided for observing the second The second visible area 64 and the second scale 63 of the moving distance of the movable rod 7.

Further, the head end of the first support 1 has a bend at a certain angle α relative to the first support 1, and correspondingly, the head end of the second support 5 has a bend at a certain angle β relative to the second support 5; The bending direction of the head end of the stent 1 is the same as the bending direction of the head end of the second stent 5; preferably, the value range of α or β is 45°-180°; preferably, α=β; due to the surgical habits of each doctor Different or different surgical scenes and other factors, different stent bending angles can adapt to different needs.

The handle end 9 of the first bracket 1 and the handle end 9 of the second bracket 5 are the hand-held parts during use. A limit device is provided between the handle ends 9. The limit device includes a second screw 72 and two limit nuts. One end of the screw 72 is fixed to the handle end 9 of the second bracket 5 by a connecting piece. Correspondingly, the handle end 9 of the first bracket 1 is provided with a through hole, and the other end of the second screw 72 passes through the limit nut, the through hole and the Another limit nut. Rotate the two limit nuts to the two ends of the handle end 9 of the first support 1 to restrict the movement of the handle end 9 of the first support 1 to limit the handle end 9 of the first support 1 to the third Different positions on the screw 91 control the opening distance between the first bracket 1 and the second bracket 5.

Further, the supporting rod 4 includes a supporting part 42 for supporting and a first connecting rod 41 for connecting the first movable rod 3. The supporting part 42 is connected to the head end of the first connecting rod 41, and the first movable rod 3 is connected to the first connecting rod 41. The end of a connecting rod 41 is connected; the first fixed tube 2 is sleeved on the first movable rod 3 and the first connecting rod 41, and is used to restrict the movement direction of the first movable rod 3 and the first connecting rod 41;

Further, the support portion 42 is provided with an arc-shaped concave surface 421 for avoiding the spinous process of the pivot. The concave depth of the arc-shaped concave surface 421 is deeper than the height of the spinous process protruding from the articular process or the side mass, so as to ensure that the arc-shaped concave surface 421 is completely Cover the spinous process, so that the support part 42 can avoid the interference of the spinous process of the axis, and support on the articular process or side block, wherein the shape of the support part 42 can be square or arc, etc.;

A limit structure is provided between the first connecting rod 41 and the first fixed tube 2 to restrict the first connecting rod 41 from rotating in the first fixed tube 2;

The limiting structure between the first connecting rod 41 and the first fixing tube 2 is: at least one threaded through hole 412 is provided on one side of the first connecting rod 41, which may be multiple screw through holes, if there are multiple screw through holes Screw the screws into different threaded through holes 412 according to different advancing distances. After the screws are screwed into the threaded through holes 412 through the first visible area 21, the clamping position of the screw is restricted by the opening shape of the first visible area 21. The connecting rod 41 cannot rotate in the first fixed tube 2; this kind of limit structure is simple and the production difficulty is low.

Further, the end of the first connecting rod 41 is provided with a first cavity 411; the first movable rod 3 has a first screw 32 for screwing into the first fixed tube 2, and the first end of the first screw 32 is provided with a first recess. The cavity 411 is adapted to fit into the first insertion end 31 of the first cavity 411, and the first end of the first screw 32 is connected to the first through the cooperation of the first insertion end 31 and the first cavity 411 The end of the rod 41 is movably connected. The end of the first screw 32 is provided with a first nut 33 for rotating the first movable rod 3. The first screw 32 is driven to rotate by the first nut 33, so that the first movable rod 3 is fixed in the first position. The inside of the tube 2 is moved in or out, so that the first connecting rod 41 drives the supporting portion 42 to perform a forward pushing action.

Further, the gripping part 8 includes a chuck 81 for clamping the posterior arch of the atlas, an adjusting member 82 for adjusting the tightness of the chuck 81, and a second connecting rod 86 for connecting the second movable rod 7. The head 81 is connected to the first end of the second connecting rod 86, and the second movable rod 7 is connected to the end of the second connecting rod 86; the second fixed tube 6 is sleeved on the second movable rod 7 and the second connecting rod 86 to restrict The movement direction of the second movable rod 7 and the second connecting rod 86; the adjusting member 82 cooperates with the chuck 81 to clamp the posterior arch of the atlas, and the second movable rod 7 drives the chuck 81 to pull back through the second connecting rod 86;

A limit structure is provided between the second connecting rod 86 and the second fixed tube 6 to restrict the second connecting rod 86 from rotating in the second fixed tube 6;

The limiting 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, and the second fixing tube 6 is provided with a hollow corresponding to the cross section of the second connecting rod 86. The cavity 62 is provided with a second limiting plane 61, and the first limiting plane 85 and the second limiting plane 61 are attached to restrict the second connecting rod 86 from rotating in the second fixed tube 6.

Further, the end of the second connecting rod 86 is provided with a second cavity 84; the second movable rod 7 has a second screw 72 for screwing into the second fixed tube 6, and the first end of the second screw 72 is provided with a second recess. The cavity 84 is adapted to fit into the second insertion end 71 of the second cavity 84, and the first end of the second screw 72 is connected to the second through the cooperation of the second insertion end 71 and the second cavity 84 The end of the rod 86 is movably connected; 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 is fixed in the second The tube 6 is moved in or out, so that the chuck 81 is driven by the second connecting rod 86 to pull back; through this extension method, the reset operation can be performed at a longer distance, which reduces the difficulty of operation and also Provides additional reset force for the pull-back reset.

Further, the root connecting ends of the two gripping hands are fixedly connected to the ends of the arms in the gripping arm 678, and the front end of the gripping hand is provided with a plurality of saw teeth 811. The height of the saw teeth 811 is sequentially reduced from the front end to the rear end of the gripping hand, so that The serrations 811 form a gradient; if the serrations 811 are of the same height, because the thickness of the upper and lower edges of the posterior arch of the atlas is different, it is easy to have slippery teeth during the pull-back process, and pass a gradient serration 811 that is high in the front and low in the back. , Can better bite the posterior arch of the atlas and prevent slipping during the post-pull action of the reduction process.

Further, the first end of the second connecting rod 86 is provided with a fixing portion 83, which is used to fix the adjusting member 82 at different positions of the clamping arm 678, so as to adjust the opening degree of the two clamping hands; the fixing portion 83 is an external thread structure , The adjusting member 82 includes a rotating end 821 and a clamping end 822 for clamping the gripper. The rotating end 821 is provided with an internal thread that can be screwed into an external thread structure. The adjusting rotating end 821 can make the adjusting member 82 connect to the second connecting rod 86. Relative movement; the locking end 822 is a hollow design, when the adjusting member 82 moves on the second connecting rod 86, the locking end 822 squeezes the gripping hand to adjust the opening degree of the two gripping hands; the screw adjustment can be rotated by adjusting Feel the tightness of the hand clamp at the end 821, to prevent the clamp from being too tight or too loose to affect the operation process; thread adjustment can be finely adjusted, unlike the snap-in fixing method, which can only be adjusted every time The distance of one card slot.

Specific use: Observe the positional relationship between the dislocated atlas and the axis, adjust the handle end 9 so that the distance between the clamp arm 678 and the support arm 234 fits the distance between the atlas and the axis, adjust the clamp arm 678 and After the distance between the support arms 234, screw two limit nuts to both sides of the handle end 9 of the first bracket 1 to fix the first bracket 1, and then screw the screw through the first visible area 21 into the thread The through hole 412 restricts the rotation of the first connecting rod 41 in the first fixing tube 2; then, hold the handle end 9 and push the gripping arm 678 into the posterior arch of the dislocated atlas, and adjust the rotation end 821 to reduce the opening between the two gripping hands. , Make the two grippers bite the posterior arch of the atlas, and then rotate the first nut 33 of the first movable rod 3 to move the first movable rod 3 in the first fixed tube 2 and drive the supporting part 42 to advance forward, The curved concave surface 421 corresponds to the spinous process of the axis, and the supporting legs on both sides are placed at the articular process or side mass of the axis for support, and then the first nut 33 is rotated to move the axis forward to generate a reduction force. Make the atlantoaxial relative movement, that is, directly push the axis forward, and indirectly lift the atlas to achieve the effect of reduction. At the same time, the reduction distance can be controlled through the visible area; after the reduction is completed, adjust the rotating end 821 to make the two hands The opening of the space is increased, and the atlantoaxial dislocation posterior reducer with movable support arm 234 can be taken out by holding the handle end 9.

Another use case: similar to the above use case, if the supporting arm 234 and the clamping arm 678 correspond to the corresponding positions of the atlas and the axis, the supporting arm 234 may not be used for the reset operation, and the clamp arm 678 may be used for the reset operation; rotate the second The second nut 73 of the movable rod 7 makes the second movable rod 7 move in the second fixed tube 6 and drives the gripper 8 to perform the operation of pulling back and forth to reset.

The third use case: similar to the above use case, set the support arm 234 and the clamping arm 678 to the corresponding positions of the atlas and the axis, and use the support arm 234 and the clamping arm 678 to perform the reset operation; rotate the first movable rod 3 A nut 33 moves the first movable rod 3 in the first fixed tube 2, and drives the supporting portion 42 to advance to perform a push and reset operation. At the same time, the second nut 73 of the second movable rod 7 is rotated to make the second movable rod 7 moves in the second fixed tube 6 to drive the gripping part 8 to pull back and forth to reset. The force of the reset can be greatly increased by the simultaneous force of the two arms.

The present invention has the following advantages. The reset operation of the present invention is simple, can provide additional reset force, can accurately control the reset distance, and solve the problems of insufficient rear reset force, difficult reset operation and poor reset effect in the prior art; When resetting, you can choose to use the support arm 234 for force reset, or choose to use the clamp arm 678 for force reset, or use the support arm 234 and the clamp arm 678 for the reset operation at the same time; both arms can be adjusted for reset The operation greatly increases the practicability and can adapt to a variety of complicated surgical situations.

The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the present invention. Within the scope of protection.

Claims

A posterior reducer for atlantoaxial dislocation with a movable arm, characterized in that it has a clip-shaped limit frame, the clip-shaped limit frame has a first frame and a second frame, the first frame and The second bracket is cross-connected at the intersection of the middle part, and the head end of the first bracket is equipped with a support arm for supporting and pushing and resetting. The support arm includes a support rod, and a first movable rod movably connected to the support rod , A first fixed tube sleeved at the connecting part of the support rod and the first movable rod, the first fixed tube is fixedly installed on the first section of the first bracket; the first end of the second bracket is installed for A clamping arm for clamping the spinous process, the clamping arm includes a clamping hand portion, a second movable rod movably connected to the clamping hand portion, and a second movable rod sleeved on the connecting portion of the clamping hand portion and the second movable rod Two fixed tubes, the second fixed tube is fixedly installed at the head end of the second bracket; the tail ends of the first bracket and the second bracket are used as handle ends.
The posterior reducer for atlantoaxial dislocation with movable arms according to claim 1, characterized in that: the head end of the first stent is bent at a certain angle α relative to the first stent; correspondingly, the The head end of the second stent is bent at a certain angle β relative to the second stent; the bending direction of the head end of the first stent is the same as the bending direction of the head end of the second stent; the value range of the α or β It is 45°-180°; the α=β.
The posterior reducer for atlantoaxial dislocation with movable arms according to claim 1, wherein the supporting rod includes a supporting part for supporting and a first connection for connecting the first movable rod Rod, the support portion is connected with the first end of the first connecting rod, the first movable rod is connected with the end of the first connecting rod; the first fixed tube is sleeved on the first movable rod and the first connecting rod The rod is used to limit the direction of movement 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 pivot, so that the supporting part can avoid the interference of the spinous process of the pivot. Support and push forward on the vertebral arch;

A limit structure is provided between the first connecting rod and the first fixed tube to restrict the first connecting rod from rotating in the first fixed tube.
The posterior reducer for atlantoaxial dislocation with movable arms according to claim 3, characterized in that: the end of the first connecting rod is provided with a first cavity; and the first movable rod is provided for screwing in The first screw of the first fixing tube, the first end of the first screw is provided with a first clamping end that is adapted to the first cavity and used for clamping into the first cavity. The fitting of the inlet end and the first cavity movably connects the head end of the first screw rod with the end of the first connecting rod. The end of the first screw rod is provided with a first nut for rotating the first movable rod. The first screw is driven to rotate, so that the first movable rod is moved in or out of the first fixed pipe, so that the first connecting rod drives the support part to make a forward push action.
The posterior reducer for atlantoaxial dislocation with movable arms according to claim 1, wherein the gripping part includes a chuck for clamping the posterior arch of the atlas and for adjusting the tightness of the chuck And a second connecting rod for connecting the second movable rod, the chuck is connected to the first end of the second connecting rod, and the second movable rod is connected to the end of the second connecting rod; The second fixing tube is sleeved on the second movable rod and the second connecting rod, and is used to restrict the movement direction of the second movable rod and the second connecting rod; the adjusting member cooperates with the chuck to clamp the posterior arch of the atlas, The second movable rod drives the chuck to pull back through the second connecting rod;

A limit structure is provided between the second connecting rod and the second fixed tube to restrict the second connecting rod from rotating in the second fixed tube.
The posterior reducer for atlantoaxial dislocation with movable arms according to claim 5, characterized in that: the end of the second connecting rod is provided with a second cavity; the second movable rod is provided for screwing in The second screw of the second fixing tube, the head end of the second screw is provided with a second clamping end that is adapted to the second cavity and used for clamping into the second cavity. The engagement of the inlet end and the second cavity movably connects the head end of the second screw rod with the end of the second connecting rod; the end of the second screw rod is provided with a second nut for rotating the second movable rod; through the second nut The second screw is driven to rotate, so that the second movable rod is moved in or out of the second fixed pipe, so that the chuck head is driven to pull back through the second connecting rod.
The posterior reducer for atlantoaxial dislocation with movable arms according to claim 5, wherein the chuck includes two open gripping hands, and the roots of the two gripping hands are connected to the first The two connecting rods are fixedly connected, the front end of the gripping hand is provided with a plurality of saw teeth, and the height of the saw teeth is sequentially reduced from the front end to the rear end of the gripping hand.
The posterior reducer for atlantoaxial dislocation with movable arms according to claim 5, wherein the first end of the second connecting rod is provided with a fixing part, and the fixing part is used to fix the adjusting member to The clamping arms are at different positions to adjust the opening degree of the two clamping hands; the fixed part is an external thread structure, and the adjusting member includes a rotating end and a clamping end for clamping the clamping hand, and the rotating end is provided with an internal thread It can be screwed into the external thread structure, adjusting the rotating end can make the adjusting member move relative to the second connecting rod; the locking end is of hollow design, and when the adjusting member moves on the second connecting rod, the locking end faces The clamping hands are squeezed to adjust the opening degree of the two clamping hands.
The posterior reducer for atlantoaxial dislocation with movable arms according to claim 1, wherein the first fixed tube is also provided with a first visual device for observing the movement distance of the first movable rod. Area and a first scale; the second fixed tube is also provided with a second visible area and a second scale for observing the moving distance of the second movable rod.
The posterior reduction device for atlantoaxial dislocation with movable arms according to claim 1, wherein a limit device is provided between the handle end of the first bracket and the handle end of the second bracket, and the limit device The positioning device includes a third screw and two limiting nuts. One end of the third screw is fixed on the handle end of the second bracket through a connecting piece; correspondingly, a through hole is provided on the handle end of the first bracket, and the third The other end of the screw passes through the first limit nut, the through hole and the second limit nut in sequence, and the position of the handle end of the first bracket on the third screw is defined by the two limit nuts, so as to align the gap between the two handle ends. The distance plays a limit effect.