CN210077744U

CN210077744U - Cervical vertebra opening device

Info

Publication number: CN210077744U
Application number: CN201920624506.8U
Authority: CN
Inventors: 刘宝戈; 崔维
Original assignee: Beijing Tiantan Hospital
Current assignee: Beijing Tiantan Hospital
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2020-02-18
Anticipated expiration: 2029-04-30

Abstract

The utility model provides a cervical vertebra distraction device belongs to orthopedics and corrects technical field, and this cervical vertebra distraction device includes supporting guide rail, first regulating unit, first strutting piece, first support piece and second strutting piece, first regulating unit with supporting guide rail connects, first strutting piece with first regulating unit connects, first support piece with first regulating unit fixed connection, the second strutting piece with first support piece connects, along being on a parallel with in supporting guide rail's direction, the second strutting piece with first strutting piece sets up side by side. The utility model discloses reduced the possibility that takes place the screw cutting centrum phenomenon, and then improved the success rate of cervical vertebra correction operation.

Description

Cervical vertebra opening device

Technical Field

The utility model belongs to the technical field of the orthopedics is corrected, especially, relate to a cervical vertebra distraction device.

Background

The cervical vertebra distracter is one kind of common surgical instrument and has the function of distracting cervical vertebra during orthopedic correction.

The existing cervical vertebra distractor comprises a rack, two position adjusting units and two sleeves, wherein the two position adjusting units (comprising adjusting blocks, gear sets, stopping pieces and distraction arms) are arranged in two groups, the two position adjusting units are connected with the rack so as to move relatively (close to or away from each other) in the direction along the rack, and the two sleeves are connected with the two position adjusting units in a one-to-one correspondence manner. When the cervical vertebra centrum needs to be expanded, the screw on the centrum is sleeved by the sleeve, and then the centrum is driven to move by moving the sleeve, so that the cervical vertebra centrum is expanded.

Nevertheless this application utility model people in the in-process of realizing utility model technical scheme in this application embodiment, discover that above-mentioned technique has following technical problem at least:

the existing cervical vertebra distractor is used for distracting the vertebral body, and the phenomenon of cutting the vertebral body by screws easily occurs due to the fact that the pressure to be overcome is large, and then the operation risk is increased.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application solves the technical problem that the phenomenon of the vertebral body is easily cut by screws in the prior art by providing the cervical vertebra distraction device, reduces the possibility of the vertebral body cutting by the screws, and further improves the success rate of cervical vertebra correction operation.

The embodiment of the application provides a cervical vertebra distraction device, includes:

supporting the guide rail;

a first adjusting unit connected with the support rail;

a first spreader connected with the first adjustment unit;

the first supporting piece is fixedly connected with the first adjusting unit; and

the second strutting piece is connected with the first strutting piece, and the second strutting piece and the first strutting piece are arranged side by side along the direction parallel to the support guide rail.

The utility model discloses in the one or more technical scheme that provides, following technological effect or advantage have at least:

the utility model discloses cervical vertebra distraction device, through setting up first strutting piece, first strutting piece and second strutting piece, in-process strutting the cervical vertebra cone, can connect two screws on one side of the affected part simultaneously, strut two cones on one side of the affected part simultaneously, thereby for prior art, the power of strutting that bears original cone, apply to two cones, the pressure that the ware need be overcome of strutting has been reduced, the technical problem of the screw cutting centrum phenomenon appears easily among the prior art has been solved, and then reduced the possibility that takes place screw cutting centrum phenomenon, and then the success rate of cervical vertebra correction operation has been improved more.

Drawings

Fig. 1 is a schematic structural view of the cervical spine distraction device of the present invention in one embodiment;

FIG. 2 is a schematic view of the cervical spine distractor of FIG. 1 from another perspective;

FIG. 3 is a schematic structural view of the support rail of FIG. 1;

fig. 4 is a schematic structural view of the cervical spine stretching device of the present invention in another embodiment;

FIG. 5 is a schematic view of the cervical distraction device of FIG. 4 after distraction;

in the above figures: 10. supporting the guide rail; 20. a first adjusting unit; 21. a first slider; 22. a first gear set; 23. a first stopper piece; 24. a first support arm; 30. a first spreader; 31. a sleeve portion; 32. a connecting portion; 40. a first support member; 50. a second spreader; 60. a first moving member; 70. a second adjusting unit; 71. a second slider; 72. a second gear set; 73. a second stopping sheet; 74. a second support arm; 80. a third spreader; 90. a second support member; 100. a fourth spreader; 110. a second moving member.

Detailed Description

The present invention is specifically described below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.

In the description of the present invention, it should be noted that: (1) the terms "inner", "outer", "upper", "lower", "front", "rear", and the like, indicate orientations or positional relationships based on the positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention; (2) when an element is referred to as being "fixed to" or "supported from" another element, it can be directly on the other element or intervening elements may also be present; (3) when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present; (4) the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The utility model discloses technical scheme in the embodiment is for solving the technical problem that the technique exists, and the general thinking is as follows:

the utility model provides a cervical vertebra distraction device, be used for in the cervical vertebra correction operation, it removes to drive the bolt, in order to realize strutting the cervical vertebra centrum, in order to solve the technical problem that the screw cutting centrum phenomenon appears easily among the prior art, this cervical vertebra distraction device improves prior art, set up the sheathed tube quantity in a position control unit into two, this cervical vertebra distraction device includes supporting guide rail promptly, first regulating unit, first distraction piece, first support piece and second distraction piece, first regulating unit is connected with supporting guide rail, first distraction piece is connected with first regulating unit, first support piece and first regulating unit fixed connection, the second distraction piece is connected with first support piece, in the direction that is on a parallel with supporting guide rail, the second distraction piece sets up side by side with first distraction piece.

Based on the above, the utility model discloses cervical vertebra distraction device, through setting up first strutting piece, first strutting piece and second strutting piece, at the in-process that struts the cervical vertebra cone, can connect two screws on one side of the affected part simultaneously, strut to two cones on one side of the affected part simultaneously, thereby for prior art, the power of strutting that bears original cone, apply to two cones, the pressure that the ware need be overcome of strutting has been reduced, the technical problem of the screw cutting centrum phenomenon appears easily among the prior art has been solved, and then reduced the possibility that takes place screw cutting centrum phenomenon, and then the success rate of cervical vertebra correction operation has been improved.

In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.

Example one

Referring to fig. 1 to 3, which are schematic structural views of the cervical spine distraction device of the present invention in one embodiment. The utility model discloses cervical vertebra distraction device is arranged in the cervical vertebra correction operation, drives the bolt and removes to the realization is to strutting of cervical vertebra centrum, and this cervical vertebra distraction device includes supporting rail 10, first regulating unit 20, first distraction piece 30, first support piece 40 and second distraction piece 50.

The supporting guide rail 10 is used for supporting other components, and is convenient for adjusting the relative position of the spreading part and the screw, so that the screw can be accurately connected. Specifically, as shown in fig. 1 and 2, the support rail 10 is rack-shaped, and the support rail 10 extends along an arc direction, so that compared with the prior art, the support rail 10 can better adapt to the physiological curvature of the cervical vertebrae of the human body, so that screws can fix and distract the cervical vertebrae in a stable posture, and further improve the success rate of the cone correction surgery, wherein as shown in fig. 3, the support rail 10 is preferably circular arc-shaped, and meanwhile, if the radius of the support rail 10 is r and the central angle of the support rail 10 is a, then 260mm ≦ r ≦ 360mm, and a ≦ 60 ° ≦ 160 °.

The first adjusting unit 20 is connected to the support rail 10 to reciprocate along the support rail 10, and the first adjusting unit 20 is configured to drive the first spreading member 30 and the second spreading member 50 to move, so that the first spreading member 30 and the second spreading member 50 can be accurately connected to their corresponding screws. Specifically, as shown in fig. 1 and 2, the first adjusting unit 20 includes a first slider 21, a first gear set 22, a first stopping piece 23 and a first supporting arm 24, the first slider 21 is disposed in an arc shape corresponding to the supporting rail 10, and the first slider 21 is connected with the supporting rail 10 in a sliding fit manner to reciprocate along the supporting rail 10, so as to achieve adjustability of the position of the first adjusting unit 20, and further achieve adjustability of the positions of the first spreader 30 and the second spreader 50; the first sliding block 21 is in the shape of an arc hollow sleeve, the first sliding block 21 is sleeved outside the support guide rail 10 to slide back and forth along the support guide rail 10, and meanwhile, the screw is driven to make position and angle switching actions according to the physiological curvature of the cervical vertebra of a human body; the first gear set 22 is fixedly arranged on the first sliding block 21 in an integrated molding or welding mode and the like, and the first gear set 22 is in meshing transmission with the rack part of the support guide rail 10 so as to drive the first sliding block 21 to move on the support guide rail 10 through the rotation of a gear; the first stopping sheet 23 is hinged on the first sliding block 2, and the first stopping sheet 23 is contacted with the rack part of the support guide rail 10 so as to realize the unidirectional (i.e. the spreading direction) movement of the first sliding block 2 according to the matching principle of ratchet wheels and ratchets; one end of the first supporting arm 24 is fixedly connected to the first sliding block 21 to move synchronously with the first sliding block 21, and the other end of the first supporting arm 24 is connected to the first supporting member 40 and the first opening member 30 to drive the first supporting member 40 and the first opening member 30 to move synchronously.

The first spreading member 30 is connected to the first adjusting unit 20 to be supported by the first adjusting unit 20, and the first spreading member 30 is connected to the screw to drive the screw to move, thereby realizing the movement of the cervical vertebral body. Specifically, as shown in fig. 1 and 2, the first spreading member 30 includes a sleeve portion 31 and a connecting portion 32, the sleeve portion 31 is hollow and cylindrical, the sleeve portion 31 is used for being sleeved with a screw to drive the screw to move, one end of the connecting portion 32 is fixedly connected with the sleeve portion 31, and the other end of the connecting portion 32 is preferably rotatably connected with the first support arm 24, so that the first spreading member 30 can rotate relative to the first support arm 24 while synchronously moving with the first support arm 24, and thus the relative position of the first spreading member 30 and the screw can be better adjusted, the accuracy of connection between the first spreading member 30 and the screw is further improved, and the phenomenon of stress concentration caused by improper position of the first spreading member 30 is avoided; as further shown in fig. 1 and 2, the connecting portion 32 is hinged to the first supporting arm 24, and the rotating shafts of the connecting portion 32 and the first supporting arm 24 are parallel to the first supporting member 40. Of course, in other embodiments, the first spreader 30 is fixedly attached to the first support arm 24 by welding, bolting, or the like.

The first supporting member 40 is fixedly connected to the first adjusting unit 20 to be supported by the first adjusting unit 20, and the first supporting member 40 is used for supporting the second opening member 50. Specifically, as shown in fig. 1 and 2, the first support 40 has a circular rod shape, and the first support 40 extends in a linear direction; in order to improve the accuracy of the connection with two screws on one side of the affected part, the utility model discloses cervical vertebra distraction device still includes first moving member 60, first moving member 60 is connected with the cooperation of first support piece 40, in order to move on first support piece 40, first moving member 60 is connected with second distraction piece 50, in order to drive second distraction piece 50 along the synchronous movement of straight line direction, thereby realize the regulation of relative position between second distraction piece 50 and first distraction piece 30, can be according to the different intervals between two screws on one side of the affected part promptly, adjust the relative position between second distraction piece 50 and first distraction piece 30, and then can improve the accuracy of the connection with two screws on one side of the affected part, further reduce the phenomenon of stress concentration and take place; as further shown in fig. 1 and fig. 2, the first supporting member 40 has a first external thread, the first moving member 60 is a hollow sleeve, the first moving member 60 has a first internal thread, the first moving member 60 is sleeved outside the first supporting member 40, and the first internal thread is matched with the first external thread, so that when the adjusting device is used, the first moving member 60 can move back and forth on the first supporting member 40 by rotating the first moving member 60, and further the position of the first moving member 60 on the first supporting member 40 can be adjusted.

The second spreading member 50 is connected to the first supporting member 40 to be supported by the first supporting member 40, and the second spreading member 50 is arranged side by side with the first spreading member 30 in a direction parallel to the first supporting member 40. Specifically, as shown in fig. 1 and 2, the second spreading member 50 is rotatably connected to the first moving member 60, so as to rotate relative to the first moving member 60 while synchronously moving along with the first moving member 60, thereby better adjusting the relative position between the second spreading member 50 and the screw, further improving the accuracy of connection between the second spreading member 50 and the screw, and avoiding the phenomenon of stress concentration caused by improper position of the second spreading member 50; to the structure of second strutting piece 50, and the concrete connection mode of its and first moving member 60, can refer to above-mentioned first strutting piece 30 to and the concrete connection mode between first strutting piece 30 and first supporting arm 24, the utility model discloses do not describe here in detail. Of course, in other embodiments, the second spreader 50 may also be fixedly connected to the first moving member 60 by welding or bolting.

Based on the above, the utility model discloses following technological effect or advantage have at least:

the utility model discloses cervical vertebra distraction device, through setting up first distraction piece 30, first support piece 40 and second distraction piece 50, in-process strutting the cervical vertebra cone, can connect two screws on one side of the affected part simultaneously, strut two cones on one side of the affected part simultaneously, thereby for prior art, the power of strutting that bears original cone, apply to two cones, the pressure that the distractor need overcome has been reduced, the technical problem of the screw cutting centrum phenomenon appears easily among the prior art has been solved, and then reduced the possibility that takes place screw cutting centrum phenomenon, and then the success rate of the operation is corrected to the cervical vertebra has been improved.

In order to realize the effect of stably spreading the screws on the two sides of the affected part so as to further avoid the phenomenon that the screws cut the vertebral body, the utility model further improves the prior art, the number of the sleeves in the other position adjusting unit is set to be two, in the process of opening the cervical vertebra cone, two screws at the other side of the affected part can be connected at the same time so as to stably open the cones at the two sides of the affected part at the same time, thereby, compared with the prior art, the distraction force born by one cone is applied to the two cones, the pressure to be overcome by the distractor is further reduced, the technical problem that the screw cuts the cone body easily in the prior art is better solved, thereby further reducing the possibility of vertebral body cutting by screws and further improving the success rate of cervical vertebra correction operation. The concrete description is as follows:

with continued reference to fig. 1 and 2, the cervical spine distraction device of the present invention further comprises a second adjustment unit 70,

A third spreader 80, a second support 90, and a fourth spreader 100. Wherein:

the second adjusting unit 70 is connected to the support rail 10 to reciprocate along the support rail 10, the second adjusting unit 70 is configured to drive the third spreading member 80 and the fourth spreading member 100 to move, so that the third spreading member 80 and the fourth spreading member 100 can be accurately connected to the corresponding screws, and the second adjusting unit 70 and the first adjusting unit 20 are arranged side by side along the direction of the support rail 10. Specifically, as shown in fig. 1 and 2, the second adjusting unit 70 includes a second slider 71, a second gear set 72, a second stop piece 73 and a second support arm 74, the second slider 71 is arc-shaped corresponding to the support rail 10, and the second slider 71 is connected with the support rail 10 in a sliding fit manner so as to reciprocate along the support rail 10, thereby realizing the adjustability of the position of the second adjusting unit 70, and further realizing the adjustability of the positions of the third spreader 80 and the fourth spreader 100; the second sliding block 71 is in an arc hollow sleeve shape, and the second sliding block 71 is sleeved outside the support guide rail 10 to slide back and forth along the support guide rail 10; the second gear set 72 is in meshing transmission with the rack part of the support rail 10 so as to drive the second slider 71 to move on the support rail 10 through the rotation of the gear; the second stopping piece 73 is hinged on the second sliding block 71, and the second stopping piece 73 is contacted with the rack part of the support rail 10 so as to realize the unidirectional (i.e. the spreading direction) movement of the second sliding block 71 according to the matching principle of ratchet wheels and teeth; one end of the second supporting arm 74 is fixedly connected to the second slider 71 to move synchronously with the first slider 21, and the other end of the second supporting arm 74 is connected to the second supporting member 90 and the third opening member 80 to drive the second supporting member 90 and the third opening member 80 to move synchronously.

The third spreading member 80 is connected to the second adjusting unit 70 to be supported by the second adjusting unit 70, and the third spreading member 80 is arranged side by side with the first spreading member 30 in a direction parallel to the second supporting member 90. Specifically, the third spreading member 80 is rotatably connected to the second adjusting unit 70, so as to rotate relative to the second adjusting unit 70 while synchronously moving along with the second adjusting unit 70, thereby adjusting the relative position between the third spreading member 80 and the screw better, improving the accuracy of connection between the third spreading member 80 and the screw, and avoiding the phenomenon of stress concentration due to improper position of the third spreading member 80. For the structure of the third spreader 80 and the connection mode with the second adjusting unit 70, please refer to the first spreader 30 and the connection mode with the first adjusting unit 20, which is not described herein again.

The second supporting member 90 is fixedly connected to the second adjusting unit 70 to be supported by the second adjusting unit 70, and the second supporting member 90 is used to support the fourth spreading member 100. Specifically, as shown in fig. 1 and 2, the second support 90 has a circular rod shape, the second support 90 is parallel to the first support 40, and the second support 90 is coaxial with the first support 40; in order to improve the accuracy of the connection with two screws on one side of the affected part, the utility model discloses cervical vertebra distraction device still includes second moving member 110, second moving member 110 is connected with the cooperation of second support piece 90, in order to move on second support piece 90, the moving direction of second moving member 110 is the direction that is on a parallel with second support piece 90, second moving member 110 is connected with fourth distraction piece 100, in order to drive fourth distraction piece 100 along the direction synchronous motion that is on a parallel with second support piece 90, thereby realize the regulation of relative position between fourth distraction piece 100 and third distraction piece 80, can be according to the different intervals between two screws on one side of the affected part promptly, adjust the relative position between fourth distraction piece 100 and third distraction piece 80, and then can improve the accuracy of two screw connections with one side of the affected part, further reduce the phenomenon that the stress concentrates and take place; as further shown in fig. 1 and fig. 2, the second supporting member 90 has a second external thread, the second moving member 110 is a hollow sleeve, the second moving member 110 has a second internal thread, the second moving member 110 is sleeved outside the second supporting member 90, and the second internal thread is matched with the second external thread, so that when in use, the second moving member 110 is rotated to realize the reciprocating movement of the second moving member 110 on the second supporting member 90, and further, the position of the second moving member 110 on the second supporting member 90 is adjusted.

The fourth spreading member 100 is connected to the second supporting member 90 to be supported by the second supporting member 90, and the fourth spreading member 100 is arranged side by side with the third spreading member 80 in a direction parallel to the second supporting member 90. Specifically, as shown in fig. 1 and 2, the fourth spreading member 100 is rotatably connected to the second moving member 110, so as to rotate relative to the second moving member 110 while synchronously moving along with the second moving member 110, thereby better adjusting the relative position between the fourth spreading member 100 and the screw, further improving the accuracy of connection between the fourth spreading member 100 and the screw, and avoiding the phenomenon of stress concentration due to improper position of the fourth spreading member 100. To the structure of the fourth strutting piece 100, and the specific connection mode with the second moving piece 110, refer to the above-mentioned first strutting piece 30, and the specific connection mode between the first strutting piece 30 and the first supporting arm 24, the utility model discloses no unnecessary repeated description here. Of course, in other embodiments, the fourth spreader 100 may also be fixedly connected to the second moving member 110 by welding or bolting.

the utility model discloses cervical vertebra distraction device, set up first strutting piece 30, on the basis of first strutting piece 40 and second strutting piece 50, set up third strutting piece 80, second strutting piece 90 and fourth strutting piece 100, in-process strutting the cervical vertebra cone, can connect two screws that are located every side in affected part, with strutting two sets of screws simultaneously, thereby for prior art, further realize the distraction force that will original a cone bore, apply on two cones, the pressure that the ware need overcome has further been reduced, better solution the technical problem of the screw cutting centrum phenomenon appears easily among the prior art, and then further reduced the possibility that takes place the screw cutting centrum phenomenon, more and then further improved the success rate of cervical vertebra correction operation.

Additionally, the utility model discloses cervical vertebra distraction device, through setting up first regulating element 20 and the equal regulation of second regulating element 70 position on supporting rail 10, it includes first slider 21 to set up first regulating element 20 promptly, first slider 21 is connected with supporting rail 10 sliding fit, and simultaneously, it includes second slider 72 to set up second regulating element 70, second slider 72 is connected with supporting rail 10 sliding fit, thereby can improve the flexibility that the cone struts position and atress and adjusts, be favorable to the doctor according to actual need, select suitable position of strutting and the dynamics of strutting in a flexible way, and then be favorable to improving the efficiency that the cervical vertebra was corrected the operation.

For a more clear explanation of the present invention, the following description will be made of the embodiment shown in fig. 1 and 2 as an example of the operation process of the present invention for expanding the cone:

when in operation, firstly, screws are driven into two vertebral bodies on two sides of an affected part. Rotating the first gear set 22 to adjust the rotation angle of the first spreader 30 so that the first spreader 30 sleeves the screw, rotating the first moving member 60 to adjust the position of the second spreader 50, and adjusting the rotation angle of the second spreader 60 so that the second spreader 60 sleeves the screw;

similarly, the positions and rotation angles of the third spreader 80 and the fourth spreader 100 are adjusted to cover the corresponding screws.

The first gear set 22 and the second gear set 72 are rotated to apply a distraction force to the cones on both sides of the affected part until distraction is completed.

Example two

Referring to fig. 4 and 5, the difference from the first embodiment is that the present embodiment provides the support rail 10 in a straight line, i.e., the support rail 10 extends along a straight line.

At this time, as shown in fig. 4 and 5, the supporting rail 10 is in a rack shape, the first slider 21 and the second slider 71 are in a quadrangular prism-shaped hollow sleeve shape, the first supporting member 40 and the second supporting member 90 are both parallel to the supporting rail 10, the moving direction of the first moving member 60 is a direction parallel to the supporting rail 10, and the first moving member 60 is connected to the second spreading member 50 to drive the second spreading member 50 to synchronously move along a direction parallel to the supporting rail 10.

Of course, as an alternative embodiment, the first gear set 22 may be replaced by a worm gear set, in this case, the support rail 10 is a worm gear, the worm gear set is in mesh transmission with the worm gear, so as to realize the movement of the first sliding block 21 along the worm gear, and at the same time, due to the self-locking characteristic between the worm gear and the worm gear, the first stopping sheet 23 is not required to be arranged, so that the unidirectional movement of the first sliding block 21 can be ensured. In addition, the first adjusting unit 20 may also be fixedly connected with the support rail 10; similarly, the second gear set 72 can be replaced by a worm gear set, in this case, the support rail 10 is a worm, the worm gear set is in meshing transmission with the worm, so that the movement of the second slider 71 along the worm is realized, and meanwhile, due to the self-locking characteristic between the worm gear and the worm, the one-way movement of the second slider 71 can be ensured without arranging the second stopping sheet 73.

Claims

1. The utility model provides a cervical vertebra distraction device which characterized in that, cervical vertebra distraction device includes:

supporting the guide rail;

a first adjusting unit connected with the support rail;

a first spreader connected with the first adjustment unit;

2. The cervical distractor of claim 1 further comprising:

the first moving piece is connected with the first supporting piece in a matched mode, and the first moving piece is connected with the second strutting piece;

the first supporting piece is in a rod shape and is provided with a first external thread, the first moving piece is in a hollow sleeve shape and is provided with a first internal thread, the first moving piece is sleeved outside the first supporting piece, and the first internal thread is matched with the first external thread.

3. The cervical distractor of claim 2 wherein the second distractor is rotatably connected to the first moving member.

4. The cervical distractor of any one of claims 1-3, wherein the first distractor is rotatably connected to the first adjustment unit.

5. The cervical distractor of any one of claims 1-3, further comprising:

a second adjustment unit connected to the support rail, the second adjustment unit being arranged side by side with the first adjustment unit in a direction along the support rail;

a third spreader connected to the second adjustment unit, the third spreader being disposed side-by-side with the first spreader in a direction parallel to the first support;

the second supporting piece is fixedly connected with the second adjusting unit; and

a fourth spreader connected to the second support, the fourth spreader arranged side-by-side with the third spreader in a direction parallel to the first support.

6. The cervical distractor of claim 5 further comprising:

the second moving part is connected with the second supporting part in a matched mode, the moving direction of the second moving part is parallel to the direction of the first supporting part, and the second moving part is connected with the fourth supporting part.

7. The cervical distractor of claim 6, wherein the fourth distractor is rotatably connected to the second moving member.

8. The cervical distractor of claim 7, wherein the third distractor is rotatably connected to the second adjustment unit.

9. The cervical distractor of claim 5, wherein the first adjustment unit includes:

the first sliding block is connected with the supporting guide rail in a sliding fit manner;

the second adjusting unit includes:

and the second sliding block is connected with the supporting guide rail in a sliding fit manner.

10. The cervical distractor of claim 1 wherein the support rails are arcuate.