A transoral approach atlantoaxial lateral mass joint stability fusion cage

Abstract

The application discloses an oropharyngeal approach atlantoaxial lateral mass joint stability fusion ware, and belongs to the technical field of medical devices. The oropharyngeal approach atlantoaxial lateral mass joint stability fusion ware comprises a fusion ware implanted in the lateral joint block position between the atlas and the pivot, wherein the fusion ware comprises a lower connecting assembly and an upper connecting assembly; the lower connecting assembly comprises a lower main body; the upper connecting assembly comprises an upper main body; a middle positioning assembly matched with the upper connecting assembly is fixedly connected to the center position of the top of the lower main body; expansion assemblies are installed on both sides between the lower connecting assembly and the upper connecting assembly; a rotating inner support assembly is sleeved outside the middle positioning assembly; and an inner support unfolding assembly is installed between the rotating inner support assembly and a threaded seat. The expandable expansion assemblies can be quickly unfolded during the working process, so that the contact area of the fusion ware and the lateral mass joint between the atlas and the pivot is increased, and a more stable support structure can be formed.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to an oropharyngeal approach atlantoaxial lateral mass joint stability fusion device. Background Art

[0002] Oropharyngeal approach atlantoaxial lateral mass arthrodesis surgery is a common spinal surgery, mainly used to treat cervical spine-related diseases, such as atlantoaxial injury or deformity. The surgery is performed through the oropharyngeal approach to reduce interference with external soft tissues. The goal of this surgery is to fix the damaged joint through fusion, improve the patient's function and reduce pain. During the operation, the bones are connected through a fusion cage, which can improve the stability of the spine. The atlantoaxial lateral mass arthrodesis cage usually includes metal, titanium alloy or other biocompatible materials to ensure a strong bond with the bone, and is fixed by inserting bone screws, screws, etc.; it is usually combined with bone graft materials to promote bone healing and achieve long-term joint stability.

[0003] Fusion devices are very important medical auxiliary devices in spinal surgery. Atlantoaxial lateral mass joint fusion devices are usually implanted from the lateral mass joint positions on both sides between the atlas and axis, so as to achieve stable support between the atlas and axis. At present, most of the atlantoaxial joint surgeries use conventional fixed fusion devices. Although they can achieve the support function, the contact surface between the fusion device and the lateral joint block is small, and the support stability is not high. In addition, in traditional spinal surgery, when implanting the fusion device, special internal fixation devices (including vertebral arch screws, fixation rods, etc.) are generally required to fix the vertebral joints. After the internal fixation device is installed, when adjusting the head position, due to the small size, simple structure and small contact area of ​​the existing fusion device, it is easy to cause the fusion device to slip and displace, which will affect the final effect of the operation to a certain extent. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide an oropharyngeal approach atlantoaxial lateral mass joint stability fusion device.

[0005] The technical solution adopted to solve the above technical problems is: an oropharyngeal approach atlantoaxial lateral mass joint stability fusion device, comprising a fusion device implanted at the lateral joint mass position between the atlas and the axis, the fusion device comprising a lower connecting component and an upper connecting component, the lower connecting component and the upper connecting component being fixed by a plurality of screws, the lower connecting component comprising a lower body, and the upper connecting component comprising an upper body;

[0006] The lower surface of the lower body and the upper surface of the upper body are both provided with tooth structures, and the top center of the lower body is fixedly connected with a middle positioning component that matches the upper connecting component;

[0007] Extension components are installed on both sides between the lower connecting component and the upper connecting component, and a rotating inner support component is sleeved on the outer side of the middle positioning component, which is used to support the extension components on both sides during implantation to increase the contact position between the fusion device and the side joint block;

[0008] A threaded seat is provided on the top of the lower body, and an inner support expansion assembly is installed between the rotating inner support assembly and the threaded seat, for adjusting the working position of the rotating inner support assembly during implantation;

[0009] A fixed cover plate is also installed at the front end between the lower connecting component and the upper connecting component. By installing the fixed cover plate, the end bending part of the extension component can be auxiliary limited and fixed to prevent it from shaking or displacement during operation.

[0010] Furthermore, the rear end of the top of the lower main body is fixedly connected with a front protrusion and two positioning columns, the front end of the top of the lower main body is fixedly connected with two rear columns, positioning slots are provided on the two rear columns, lower limit blocks are provided at adjacent positions on the outside of the two rear columns, lower limit slots are provided between the two groups of rear columns and the lower limit blocks, the rear ends of the inner sides of the two lower limit blocks are provided with downward slopes, and lower slots are provided at the front ends of the two rear columns.

[0011] Through the above technical scheme, the front protrusion and the two rear columns are mainly used for supporting the upper main body; the two positioning columns on both sides of the front protrusion are used for the rotational installation and fixation of the expansion component, so that the expansion component can rotate with the positioning column as the axis, so that the sleeve part of the expansion component can rotate on the positioning column during the process of being stretched. At the same time, in conjunction with the upper main body, it can also play a limiting role on one end of the expansion component; the positioning slot opened on the rear column can accurately engage with the bent part of the spring steel plate, so that the front and rear ends of the spring steel plate can be fixed after unfolding, thereby ensuring its stability after unfolding; the lower limit slot and the lower slope structure between the rear column and the lower limit block enable the front end of the spring steel plate to be limited in the lower limit slot during assembly and use, and at the same time, the inner lower slope structure can achieve better fit with the outer surface of the bent spring steel plate, so as to reduce the pressure at the contact position between the spring steel plate and the lower limit block, thereby extending its service life.

[0012] Furthermore, a first threaded hole is provided at the front end of the two rear columns, second threaded holes are provided on both sides of the top of the front protrusion and the top of the two rear columns, and two penetrating lower arc holes are provided on the lower body.

[0013] Through the above technical solution, the first threaded hole and the second threaded hole are mainly used for the installation and fixation of the screws. The two lower arc holes opened on the lower body can facilitate the filling of filling materials and facilitate subsequent better integration with human tissues.

[0014] Furthermore, the central positioning assembly includes a main support column fixed to the top center of the lower main body, a positioning groove is opened at the middle position of the front end of the main support column, a return spring is installed in the positioning groove, and a positioning protrusion is installed at the front end of the return spring.

[0015] Through the above technical solution, the middle positioning assembly is mainly used for the rotational support of the rotating inner support assembly and for positioning and fixing during use. During surgery, the state of the rotating inner support assembly can be adjusted through the inner support expansion assembly, so that the rotating inner support assembly can rotate on the outer wall of the main support column. When it is rotated into position, the positioning groove will remain concentric with the stepped positioning hole. At this time, the return spring in the compressed state in the positioning groove will push the positioning protrusion outward in the opposite direction and accurately insert it into the stepped positioning hole, thereby realizing the locking and fixation of the adjusted position of the rotating inner support assembly.

[0016] Furthermore, cylindrical grooves are provided on both sides of the rear end of the bottom of the upper main body, a circular slot is provided at the center of the bottom of the upper main body, upper limit blocks are fixedly connected on both sides of the front end of the bottom of the upper main body, upper limit slots are provided between the two upper limit blocks and the upper main body, an upward slope is provided on the rear end of the inner side surfaces of the two upper limit blocks, and an upper slot is provided on the front end surface of the upper main body.

[0017] Through the above technical solution, the upper main body can cooperate with the lower main body and form an integral structure after being fixed by screws. The two cylindrical grooves on the top and the circular slot opened in the center can be precisely plugged into the two positioning columns and the main support column respectively, thereby realizing pre-fixation; the upper limit slot and the upper slope at the bottom have the same function as the lower limit slot and the lower slope, and are also used to limit the spring steel plate; in addition, the upper slot and the lower slot will form a rectangular groove structure after combination, which facilitates the installation and fixation of the fixed cover.

[0018] Furthermore, mounting holes are provided at the corners of the upper body, and two penetrating upper arc holes are also provided on the upper body.

[0019] Through the above technical solution, the setting of the upper arc-shaped hole also facilitates the filling of the filling material and facilitates better integration with human tissue in the future.

[0020] Furthermore, the expansion component includes a spring steel plate, a sleeve portion is provided at the rear end of the spring steel plate, anti-slip teeth are provided at the top and bottom of the spring steel plate, and a bending portion is provided at the front end of the spring steel plate.

[0021] Through the technical scheme, the expansion assembly is an expandable structure, which can be quickly expanded to form a circular arc structure during work, thereby increasing the contact area of the lateral mass joint between the fusion cage and the atlantoaxial joint, so that a more stable support structure can be formed, and the simple structure design facilitates assembly and operation during surgery; the top and bottom of the spring steel plate are provided with anti-skid teeth, so that the contact force between the spring steel plate and the articular surface can be further increased, thereby achieving better anti-skid and anti-displacement functions.

[0022] Further, the sleeve joint part is sleeved on the outer wall of the corresponding positioning column, and the spring steel plate is clamped in the corresponding positioning clamping groove in the unfolded state.

[0023] Through the technical scheme, the bent part at the front end is a right-angle bending structure, which can be accurately clamped in the positioning clamping groove after the spring steel plate is completely unfolded, thereby ensuring the stability of both ends and preventing loosening.

[0024] Further, the rotating inner support assembly comprises a sleeve joint column sleeved on the outer side of the main support column, a through stepped positioning hole is formed in the sleeve joint column, and symmetrically arranged inner support plates are fixedly connected to the outer wall of the sleeve joint column on both sides, wherein a rotating support is fixedly connected to the inner side surface of one of the inner support plates.

[0025] Through the technical scheme, the rotating inner support assembly is an inner structure, which can rotate around the main support column, and when the inner support plates on both sides of the outer wall of the sleeve joint column are in contact with the inner side surface of the spring steel plate, the end of the inner support plate will expand the spring steel plate to form a circular arc structure and provide stable support, preventing deformation during use; in addition, when the rotating inner support assembly is rotated to the position, the reset spring in the positioning groove will quickly push the positioning protrusion out, so that the positioning protrusion is inserted into the stepped positioning hole, thereby achieving locking and fixing of the adjusted position of the rotating inner support assembly.

[0026] Further, the inner support expansion assembly comprises an inner support adjusting screw threadedly connected to a threaded seat, a connecting part is rotatably connected to the rear end of the inner support adjusting screw, an adjusting connecting rod is rotatably connected to the rear end of the connecting part, and the other end of the adjusting connecting rod is rotatably connected to the rotating support.

[0027] Through the above technical solution, the internal support deployment assembly is mainly used to drive the rotating internal support assembly. During the operation, by screwing the internal support adjustment screw, the internal support adjustment screw can be further moved into the fusion device. Since the adapter is rotatably connected to the end of the internal support adjustment screw, the adapter will make a linear motion toward the rear end, and push the rotating internal support assembly at the other end to rotate around the main support column through the adjusting connecting rod, thereby realizing the function of rapid adjustment; further, when the deployment position of the fusion device is not suitable and needs to be adjusted, the positioning protrusion can also be pushed into the stepped positioning hole through a special thin push rod to reset it to the positioning groove. At this time, the internal support adjustment screw is turned in the opposite direction to drive the rotating internal support assembly to rotate in the opposite direction, so that the spring steel plate can also be slowly reset for subsequent re-positioning.

[0028] The beneficial effects of the present invention are as follows: (1) The present invention is designed with an expandable expansion component, which can be quickly expanded during operation to form an arc-shaped structure, thereby increasing the contact area of ​​the lateral mass joint between the fusion device and the atlantoaxial joint, and also forming a more stable support structure; (2) The present invention is more convenient for assembly and operation during surgery through a simple expansion component. At the same time, the anti-slip teeth on the top and bottom of the spring steel plate can further enhance the contact force between it and the joint surface, thereby providing better anti-slip and anti-displacement functions; (3) The present invention is designed with a rotating inner support component and an inner support expansion component, which is not only very simple to operate, but also the rotating inner support component will expand the spring steel plate to form an arc-shaped structure after expansion, and provide stable support for it. In conjunction with the automatic locking structure on the middle positioning component, it can effectively prevent it from deformation during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a first perspective structural diagram of the present invention;

[0030] Figure 2 This is a structural diagram from a second perspective of the present invention;

[0031] Figure 3 is an internal cross-sectional view of the present invention;

[0032] Figure 4 This is a schematic diagram of the installation structure of the rotating inner support assembly of the present invention;

[0033] Figure 5 This is a schematic structural diagram of the lower connection assembly from a first perspective of the present invention;

[0034] Figure 6 is a schematic structural diagram of the lower connection assembly of the present invention from a second perspective;

[0035] Figure 7 This is a schematic structural diagram of the upper connection assembly of the present invention from a first perspective;

[0036] Figure 8 This is a schematic structural diagram of the upper connection assembly of the present invention from a second perspective;

[0037] Figure 9 This is a schematic diagram of the structure of the present invention in a working state from a first perspective;

[0038] Figure 10 This is a second perspective structural diagram of the present invention in working state;

[0039] Figure 11 This is a schematic diagram of the structure of the expansion component of the present invention in the first perspective when it is expanded;

[0040] Figure 12 This is a schematic diagram of the structure of the expansion component of the present invention from a second perspective in an expanded state;

[0041] Figure 13 It is a front view of the working state of the present invention;

[0042] Figure 14 yes Figure 13 Middle AA section view;

[0043] Figure 15 yes Figure 14 A partial enlarged view of point A in the middle;

[0044] Figure 16 yes Figure 14 A partial enlarged view of point B in the middle;

[0045] Figure 17 Schematic diagram of the structure of the extension assembly of the present invention in a bent state;

[0046] Figure 18 This is a schematic diagram of the connection structure between the rotating inner support assembly and the inner support expansion assembly of the present invention;

[0047] Figure 19 It is a schematic structural diagram of the fusion device of the present invention in an implanted state.

[0048] Figure numerals: 1. lower connecting assembly; 101. lower body; 102. front protrusion; 103. positioning column; 104. rear column; 105. positioning slot; 106. first threaded hole; 107. lower limit block; 108. lower limit slot; 109. lower slope; 110. lower slot; 111. threaded seat; 112. second threaded hole; 113. lower arc hole; 2. middle positioning assembly; 201. main support column; 202. positioning groove; 203. return spring; 204. positioning protrusion; 3. upper connecting assembly; 301. upper body; 302. cylindrical groove; 303. circular Slot; 304, upper limit block; 305, upper limit slot; 306, upslope; 307, upper slot; 308, mounting hole; 309, upper arc hole; 4, expansion assembly; 401, socket part; 402, spring steel plate; 403, anti-slip teeth; 404, bending part; 5, rotating inner support assembly; 501, socket column; 502, stepped positioning hole; 503, inner support plate; 504, rotating support; 6, inner support expansion assembly; 601, inner support adjustment screw; 602, adapter; 603, adjusting connecting rod; 7, fixed cover plate; 8, atlas; 9, axis; 10, cervical joint. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0050] like Figures 1-19 As shown, an oropharyngeal approach atlantoaxial lateral mass joint stability fusion device of this embodiment includes a fusion device implanted in the lateral joint block position between the atlas 8 and the axis 9, and below the axis 9 is a multi-level cervical joint 10. The fusion device includes a lower connecting component 1 and an upper connecting component 3. The lower connecting component 1 and the upper connecting component 3 are fixed by multiple screws. The lower connecting component 1 includes a lower main body 101. The top rear end of the lower main body 101 is fixedly connected to a front protrusion 102 and two positioning columns 103. The top front end of the lower main body 101 is fixedly connected to two rear columns 104. The front protrusion 102 and the two rear columns 104 are mainly used to support the upper main body 301.

[0051] Furthermore, in this embodiment, the two positioning posts 103 on both sides of the front protrusion 102 are used for rotational installation and fixation of the extension component 4, so that the extension component 4 can rotate with the positioning posts 103 as the axis, so that when the extension component 4 is stretched out, its sleeve portion 401 can rotate on the positioning posts 103. At the same time, in conjunction with the main body 301, it can also limit one end of the extension component 4.

[0052] Furthermore, in this embodiment, positioning slots 105 are provided on both rear pillars 104. The positioning slots 105 can be precisely engaged with the bent portion 404 of the spring steel plate 402, so that the front and rear ends of the spring steel plate 402 can be fixed after it is unfolded, thereby ensuring its stability after unfolding.

[0053] Furthermore, in this embodiment, lower limit blocks 107 are provided at adjacent positions on the outer sides of the two rear columns 104, lower limit slots 108 are provided between the two groups of rear columns 104 and the lower limit blocks 107, lower slopes 109 are provided on the rear ends of the inner sides of the two lower limit blocks 107, and lower slots 110 are provided at the front ends of the two rear columns 104. The lower limit slots 108 and lower slopes 109 between the rear columns 104 and the lower limit blocks 107 enable the front end of the spring steel plate 402 to be limited in the lower limit slots 108 during assembly and use, and at the same time, the lower slope 109 structure on its inner side can achieve better fit with the outer surface of the bent spring steel plate 402, so as to reduce the pressure at the contact position between the spring steel plate 402 and the lower limit block 107, thereby extending its service life.

[0054] Furthermore, in this embodiment, a first threaded hole 106 is provided at the front end of the two rear columns 104, a second threaded hole 112 is provided on both sides of the top of the front protrusion 102 and the top of the two rear columns 104, and two penetrating lower arc holes 113 are provided on the lower body 101. The first threaded hole 106 and the second threaded hole 112 are mainly used for installing and fixing screws. The two lower arc holes 113 provided on the lower body 101 can facilitate the filling of filling materials and also facilitate better integration with human tissues later.

[0055] For upper connection component 3, refer to Figures 1-8 The upper connecting component 3 includes an upper main body 301. The lower surface of the lower main body 101 and the upper surface of the upper main body 301 are both provided with a tooth structure. Cylindrical grooves 302 are opened on both sides of the rear end of the bottom of the upper main body 301, and a circular card groove 303 is opened in the center of the bottom of the upper main body 301. The upper main body 301 can cooperate with the lower main body 101 and form an integral structure after being fixed by screws. The two cylindrical grooves 302 on the top and the circular card groove 303 opened in the center can be accurately plugged with the two positioning columns 103 and the main support column 201 respectively, thereby realizing pre-fixation.

[0056] Upper limit blocks 304 are fixedly connected to both sides of the front end of the bottom of the upper main body 301. Upper limit slots 305 are provided between the two upper limit blocks 304 and the upper main body 301. An upward slope 306 is provided at the rear end of the inner side of the two upper limit blocks 304. The upper limit slots 305 and the upward slope 306 at the bottom have the same function as the lower limit slot 108 and the lower slope 109, and are also used to limit the spring steel plate 402.

[0057] An upper latching groove 307 is provided on the front end surface of the upper main body 301 . The upper latching groove 307 and the lower latching groove 110 form a rectangular groove structure when combined, thereby facilitating the installation and fixation of the fixed cover plate 7 .

[0058] The upper body 301 is provided with mounting holes 308 at the corners. The upper body 301 is also provided with two penetrating upper arc holes 309. The setting of the upper arc holes 309 is also convenient for filling the filling material and for subsequent better integration with human tissue.

[0059] Regarding the middle positioning component 2, refer to Figure 11-Figure 15 202, and the return spring 203 in the compressed state in the positioning groove 202 will push the positioning protrusion 204 outward in the opposite direction and accurately insert it into the stepped positioning hole 502, thereby realizing the locking and fixing of the adjusted position of the rotating inner support assembly 5.

[0060] For extension 4, refer to Figures 1-17 The expansion component 4 is installed on both sides between the lower connecting component 1 and the upper connecting component 3. Specifically, the expansion component 4 includes a spring steel plate 402, the rear end of the spring steel plate 402 is provided with a sleeve portion 401, the top and bottom of the spring steel plate 402 are provided with anti-slip teeth 403, and the front end of the spring steel plate 402 is provided with a bending portion 404. The expansion component 4 is an expandable structure, which can be quickly unfolded during operation to form an arc-shaped structure, thereby increasing the contact area of ​​the lateral mass joint between the fusion device and the atlantoaxial joint, thereby forming a more stable support structure. At the same time, its simple structural design is also convenient for assembly and operation during surgery; the top and bottom of the spring steel plate 402 are provided with anti-slip teeth 403, which can further enhance the contact force between it and the joint surface, thereby playing a better anti-slip and anti-displacement function.

[0061] Furthermore, in this embodiment, the sleeve portion 401 is sleeved on the outer wall of the corresponding positioning column 103, and when the spring steel plate 402 is in the unfolded state, the bent portion 404 is engaged in the corresponding positioning slot 105, and the bent portion 404 at its front end is a right-angled structure. After the spring steel plate 402 is fully unfolded, it can be accurately engaged in the positioning slot 105, thereby ensuring the stability of its two ends and preventing it from loosening.

[0062] Regarding the rotating inner support component 5, refer to Figures 10-18 The rotating inner support component 5 is sleeved on the outside of the middle positioning component 2 and is used to open the expansion components 4 on both sides during the implantation process to increase the contact position between the fusion device and the side joint blocks. Specifically, the rotating inner support component 5 includes a sleeve column 501 sleeved on the outside of the main support column 201, and a stepped positioning hole 502 is provided on the sleeve column 501. Both sides of the outer wall of the sleeve column 501 are fixedly connected with symmetrically arranged inner support plates 503, and a rotating support 504 is fixedly connected to the inner side surface of one of the inner support plates 503. The rotating inner support component 5 is an internal structure that can It rotates around the main support column 201. When the inner support plates 503 on both sides of the outer wall of the sleeve column 501 come into contact with the inner surface of the spring steel plate 402, as it continues to rotate, the ends of the inner support plates 503 will expand the spring steel plate 402 to form an arc-shaped structure, and provide stable support for it to prevent it from deformation during use; in addition, when it is rotated into place, the return spring 203 in the positioning groove 202 will quickly push out the positioning protrusion 204, so that it can be inserted into the stepped positioning hole 502, thereby realizing the locking and fixation of the adjusted position of the rotating inner support assembly 5.

[0063] For details about the inner support expansion component 6, refer to Figures 1-18A threaded seat 111 is provided on the top of the lower body 101, and the internal support expansion component 6 is installed between the rotating internal support component 5 and the threaded seat 111, and is used to adjust the working position of the rotating internal support component 5 during the implantation process; specifically, the internal support expansion component 6 includes an internal support adjustment screw 601 threadedly connected to the threaded seat 111, and the rear end of the internal support adjustment screw 601 is rotatably connected to the adapter 602, and the rear end of the adapter 602 is rotatably connected to the adjusting link 603, and the other end of the adjusting link 603 is rotatably connected to the rotating support 504. The internal support expansion component 6 is mainly used for driving the rotating internal support component 5. During the operation, by screwing the internal support adjustment screw 601, the internal support adjustment screw 601 can be further moved to the fusion When the fusion device moves inside, since the adapter 602 is rotatably connected to the end of the inner support adjusting screw 601, the adapter 602 will make a linear motion toward the rear end, and push the rotating inner support assembly 5 at the other end to rotate around the main support column 201 through the adjusting connecting rod 603, thereby realizing the function of rapid adjustment; further, when the deployment position of the fusion device is not suitable and needs to be adjusted, the positioning protrusion 204 can be pushed into the stepped positioning hole 502 through a special thin push rod to reset it to the positioning groove 202. At this time, the inner support adjusting screw 601 is turned in the reverse direction to drive the rotating inner support assembly 5 to rotate in the reverse direction, thereby allowing the spring steel plate 402 to slowly reset, so that the position can be readjusted later.

[0064] A fixed cover plate 7 is also installed at the front end between the lower connecting component 1 and the upper connecting component 3. By installing the fixed cover plate 7, the end bending portion 404 of the extension component 4 can be auxiliary limited and fixed to prevent it from shaking or displacement during operation.

[0065] The working principle of this embodiment is as follows: during surgery, after the surgeon has opened the gap between the lateral joint blocks of the atlas 8 and the axis 9, the entire fusion device can be implanted through the gap between the lateral joint blocks. After the main part of the fusion device is implanted, the inner support adjustment screw 601 is manually screwed with a tool to allow the inner support adjustment screw 601 to move further into the fusion device. Since the adapter 602 is rotatably connected to the end of the inner support adjustment screw 601, the adapter 602 will move linearly toward the rear end and push the rotating inner support assembly 5 at the other end to rotate around the main support column 201 through the adjusting connecting rod 603;

[0066] When the inner support plates 503 on both sides of the outer wall of the sleeve column 501 come into contact with the inner surface of the spring steel plate 402, as it continues to rotate, the ends of the inner support plates 503 will expand the spring steel plate 402 to form an arc-shaped structure and provide stable support for it. After expansion, the spring steel plate 402 has an overall arc-shaped structure, thereby increasing the contact area between the fusion cage and the lateral mass joint between the atlantoaxial vertebrae;

[0067] At this time, the bent part 404 of the free end of the spring steel plate 402 is clamped in the corresponding positioning clamping groove 105, thereby ensuring the stability of both ends and preventing loosening.

[0068] Finally, the fixed cover plate 7 is installed in the groove between the upper clamping groove 307 and the lower clamping groove 110 by means of a screw, and the fixed cover plate 7 can assist in limiting and fixing the bent part 404 of the expansion assembly 4 to prevent shaking or displacement during work.

[0069] The above is only a preferred embodiment of the present application, and is not intended to limit the protection scope of the present application.

Claims

1. An oropharyngeal approach atlantoaxial lateral mass joint stabilization device, comprising a device implanted at the lateral joint mass position between the atlas (8) and the axis (9), the device comprising a lower connecting component (1) and an upper connecting component (3), the lower connecting component (1) and the upper connecting component (3) being fixed by a plurality of screws, characterized in that: The lower connection assembly (1) includes a lower body (101), and the upper connection assembly (3) includes an upper body (301); The rear end of the top of the lower body (101) is fixedly connected to a front protrusion (102) and two positioning columns (103); the front end of the top of the lower body (101) is fixedly connected to two rear columns (104); the two rear columns (104) are each provided with a positioning slot (105); lower limit blocks (107) are each provided at adjacent positions on the outside of the two rear columns (104); lower limit slots (108) are each provided between the two groups of rear columns (104) and the lower limit blocks (107); the rear ends of the inner sides of the two lower limit blocks (107) are each provided with a downward slope (109); and the front ends of the two rear columns (104) are provided with a lower slot (110); The lower surface of the lower body (101) and the upper surface of the upper body (301) are both provided with tooth-shaped structures, and a middle positioning component (2) matching the upper connecting component (3) is fixedly connected to the center position of the top of the lower body (101); Extension components (4) are installed on both sides between the lower connecting component (1) and the upper connecting component (3), and a rotating inner support component (5) is sleeved on the outside of the middle positioning component (2) for supporting the extension components (4) on both sides during the implantation process to increase the contact position between the fusion device and the side joint block; The expansion component (4) includes a spring steel plate (402), a sleeve portion (401) is provided at the rear end of the spring steel plate (402), anti-slip teeth (403) are provided at the top and bottom of the spring steel plate (402), and a bending portion (404) is provided at the front end of the spring steel plate (402); A threaded seat (111) is provided on the top of the lower body (101), and an inner support expansion assembly (6) is installed between the rotating inner support assembly (5) and the threaded seat (111) for adjusting the working position of the rotating inner support assembly (5) during the implantation process; A fixed cover plate (7) is also installed at the front end between the lower connecting assembly (1) and the upper connecting assembly (3).

2. The oropharyngeal approach atlantoaxial lateral mass joint stabilization cage according to claim 1, characterized in that: The front ends of the two rear upright posts (104) are each provided with a first threaded hole (106), the top sides of the front protrusion (102) and the tops of the two rear upright posts (104) are each provided with a second threaded hole (112), and the lower body (101) is provided with two penetrating lower arc-shaped holes (113).

3. The oropharyngeal approach atlantoaxial lateral mass joint fusion device according to claim 1, characterized in that: The middle positioning assembly (2) comprises a main support column (201) fixed at the top center of the lower body (101), a positioning groove (202) is provided at the middle position of the front end of the main support column (201), a return spring (203) is installed in the positioning groove (202), and a positioning protrusion (204) is installed at the front end of the return spring (203).

4. The oropharyngeal approach atlantoaxial lateral mass joint fusion device according to claim 1, characterized in that: The upper body (301) has cylindrical grooves (302) on both sides of the rear end of the bottom, a circular clamping groove (303) on the center of the bottom of the upper body (301), upper limit blocks (304) on both sides of the front end of the bottom of the upper body (301), upper limit clamping grooves (305) are provided between the two upper limit blocks (304) and the upper body (301), an upward slope (306) is provided on the rear end of the inner side of the two upper limit blocks (304), and an upper clamping groove (307) is provided on the front end surface of the upper body (301).

5. The oropharyngeal approach atlantoaxial lateral mass joint stabilization device according to claim 4, characterized in that: The corners of the upper body (301) are provided with mounting holes (308), and the upper body (301) is also provided with two penetrating upper arc-shaped holes (309).

6. The oropharyngeal approach atlantoaxial lateral mass joint stabilization cage according to claim 1, characterized in that: The sleeve portion (401) is sleeved on the outer wall of the corresponding positioning column (103), and when the spring steel plate (402) is in an unfolded state, the bent portion (404) is engaged in the corresponding positioning slot (105).

7. The oropharyngeal approach atlantoaxial lateral mass joint fusion device according to claim 3, characterized in that: The rotating inner support assembly (5) comprises a sleeve column (501) sleeved on the outside of the main support column (201), the sleeve column (501) is provided with a stepped positioning hole (502) extending therethrough, and both sides of the outer wall of the sleeve column (501) are fixedly connected to symmetrically arranged inner support plates (503), wherein a rotating support (504) is fixedly connected to the inner side surface of one of the inner support plates (503).

8. The oropharyngeal approach atlantoaxial lateral mass joint stabilization cage according to claim 7, characterized in that: The inner support expansion assembly (6) comprises an inner support adjustment screw (601) threadedly connected to a threaded seat (111); a rear end of the inner support adjustment screw (601) is rotatably connected to a transition portion (602); a rear end of the transition portion (602) is rotatably connected to an adjustment link (603); and the other end of the adjustment link (603) is rotatably connected to a rotating support (504).

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