Atlantoaxial distractable fusion cage

Abstract

The invention provides an atlantoaxial distractable fusion cage, and belongs to the technical field of medical instruments. The atlantoaxial distractable fusion cage comprises a fusion plate assembly and a height adjusting assembly, the fusion plate assembly comprises an upper fusion plate and a lower fusion plate, the height adjusting assembly comprises a mounting base, a front sliding block and a rotating bolt, the rotating bolt is in threaded connection with the front sliding block, and the upper end face and the lower end face of the front sliding block are a first upper inclined face and a first lower inclined face; the height of the front sliding block is gradually reduced along with approaching the mounting base, the front end of the upper fusion plate and the front end of the lower fusion plate limit the mounting base, a first upper sliding groove is formed in the first upper inclined plane, a first upper sliding block is arranged on the lower end face of the upper fusion plate, and a first lower sliding groove is formed in the first lower inclined plane; a first lower sliding block is arranged on the upper end face of the lower fusion plate. According to the provided atlantoaxial distractable fusion cage, the rotating bolt is rotated, the front sliding block moves, and the distance between the upper fusion plate and the lower fusion plate is changed.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to an atlantoaxial fusion device. Background Technology

[0002] Spinal diseases are increasingly prevalent across various age groups due to changes in lifestyle, with a trend towards younger patients. Common spinal diseases include cervical disc herniation, lumbar disc herniation, cervical spinal stenosis, and lumbar spinal stenosis. Spinal fusion surgery is frequently used in the treatment of these diseases, involving the implantation of a fusion cage at the affected site to achieve functional reconstruction. However, when performing fixation and fusion surgery at the atlantoaxial joint, common atlantoaxial joint fusion cages are often designed with a fixed tilt angle (anterior convexity angle). These cages come in various sizes and lack height adjustment. During surgery, surgeons need to use trial molds and other instruments to measure the intervertebral disc height step by step to select a suitable fusion cage. This process inevitably involves repeated disturbances to the patient's nerves and muscles, causing harm and affecting the surgical outcome. Furthermore, due to the range between different sizes, it is difficult to completely correct atlantoaxial kyphosis and restore physiological lordosis. Summary of the Invention

[0003] The purpose of this invention is to provide an atlantoaxial fusion device that can be expanded, aiming to solve the problem of the non-adjustable height of the atlantoaxial fusion device.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An atlantoaxial expandable fusion device is provided, comprising a fusion plate assembly and a height adjustment assembly. The fusion plate assembly includes an upper fusion plate and a lower fusion plate, which are symmetrically arranged. The height adjustment assembly is disposed between the upper and lower fusion plates and includes a mounting base, a front slider, and a rotating bolt. The rotating bolt passes sequentially through the mounting base and the front slider from front to back. The rotating bolt is rotatably connected to the mounting base and threadedly connected to the front slider. The upper and lower end faces of the front slider are respectively... The upper and lower inclined surfaces are symmetrically arranged. The height of the front slider gradually decreases as it approaches the mounting base. The front end of the upper fusion plate is provided with an upper limit groove for limiting the upper end of the mounting base, and the front end of the lower fusion plate is provided with a lower limit groove for limiting the lower end of the mounting base. The first upper inclined surface is provided with a first upper sliding groove, and the lower end surface of the upper fusion plate is provided with a first upper slider that matches the first upper sliding groove. The first lower inclined surface is provided with a first lower sliding groove, and the upper end surface of the lower fusion plate is provided with a first lower slider that matches the first lower sliding groove.

[0005] In one possible implementation, the cross-section of the first upper slider is L-shaped, and the cross-section of the first upper groove is L-shaped.

[0006] In one possible implementation, the first upper slider is provided in two sets, the two sets of the first upper slider are symmetrically arranged, and are located on both sides of the rotating bolt.

[0007] In one possible implementation, a connecting post is provided at the rear end of the front slider, and a rear slider is provided at the rear end of the connecting post. The upper and lower end faces of the rear slider are respectively symmetrically arranged second upper inclined surfaces and second lower inclined surfaces. The height of the rear slider gradually decreases as it approaches the mounting base. The rear slider is disposed between the upper fusion plate and the lower fusion plate.

[0008] In one possible implementation, a second upper sliding groove is provided on the second upper inclined surface, and a second upper sliding block matching the second upper sliding groove is provided on the upper fusion plate. A second lower sliding groove is provided on the second lower inclined surface, and a second lower sliding block matching the second lower sliding groove is provided on the upper part of the lower fusion plate.

[0009] In one possible implementation, the rear end of the upper fusion plate is a third upper inclined surface that matches the second upper inclined surface, and the second upper slider is disposed on the third upper inclined surface.

[0010] In one possible implementation, the second upper slider is provided in two sets, with the two sets of the second upper slider arranged in parallel and on both sides of the rotating bolt.

[0011] In one possible implementation, two sets of connecting posts are provided, the two sets of connecting posts are arranged in parallel and are located on both sides of the rotating bolt.

[0012] In one possible implementation, the vertical cross-section of the mounting base is square, and the rotating bolt is located at the center of the mounting base.

[0013] In one possible implementation, the width of the upper fusion plate gradually increases from the front end to the rear end.

[0014] The beneficial effects of the atlantoaxial expandable fusion device provided by this invention are as follows:

[0015] Compared with existing technologies, this invention includes a fusion plate assembly and a height adjustment assembly. The fusion plate assembly comprises an upper fusion plate and a lower fusion plate symmetrically arranged. The height adjustment assembly is positioned between the upper and lower fusion plates and is used to adjust the distance between them. The height adjustment assembly includes a mounting base, a front slider, and a rotating bolt. The mounting base is located on the front side of the front slider, and the rotating bolt passes through the mounting base and the front slider from front to back, with a threaded connection between the rotating bolt and the front slider. The upper and lower end faces of the front slider are a first upper inclined surface and a first lower inclined surface, respectively. A first upper sliding groove is provided on the first upper inclined surface. A first upper slider is provided on the lower end face of the upper fusion plate, and the first upper slider is slidably mounted on the first upper sliding groove. Inside the groove, the upper end face of the front slider is slidably connected to the upper fusion plate. A first lower sliding groove is provided on the first lower inclined surface. A first lower slider is provided on the upper end face of the lower fusion plate. The first lower slider is slidably positioned in the first lower sliding groove. The lower end face of the front slider is slidably connected to the lower fusion plate. An upper limit groove is provided at the front end of the upper fusion plate, and a lower limit groove is provided at the front end of the lower fusion plate. The upper limit groove and the lower limit groove limit the mounting seat between the two, preventing the mounting seat from shifting in the front-back direction and increasing the stability of the device. By rotating the rotating bolt, the front slider moves towards the mounting seat, opening the upper fusion plate and the lower fusion plate, realizing the adjustment of the height of the fusion device, adapting to various situations, avoiding multiple trial moldings, and reducing harm to the patient. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the atlantoaxial expandable fusion device in its unexpanded state, as provided in an embodiment of the present invention. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the structure of the atlantoaxial expandable fusion device in its unexpanded state, as provided in an embodiment of the present invention. Figure 2 ;

[0019] Figure 3 This is a schematic diagram of the exploded structure of the atlantoaxial expandable fusion device in its unexpanded state, as provided in an embodiment of the present invention. Figure 1 ;

[0020] Figure 4 This is a schematic diagram of the exploded structure of the atlantoaxial expandable fusion device in its unexpanded state, as provided in an embodiment of the present invention. Figure 2 ;

[0021] Figure 5A schematic diagram of the atlantoaxial expandable fusion device in its expanded state, provided in an embodiment of the present invention. Figure 1 ;

[0022] Figure 6 A schematic diagram of the atlantoaxial expandable fusion device in its expanded state, provided in an embodiment of the present invention. Figure 2 ;

[0023] Figure 7 This is an exploded structural diagram of the atlantoaxial expandable fusion device in the expanded state, as provided in an embodiment of the present invention.

[0024] In the picture:

[0025] 101. Upper fusion plate; 102. Upper limit slot; 103. First upper slider; 104. Second upper slider; 105. Third upper inclined surface; 106. Upper weight reduction slot;

[0026] 201. Lower fusion plate; 202. Lower limiting groove; 203. First lower slider; 204. Second lower slider; 205. Third lower inclined surface; 206. Lower weight reduction groove;

[0027] 301. Mounting base; 302. Rotating bolt; 303. Front slider; 304. First upper inclined surface; 305. First upper sliding groove; 306. First lower inclined surface; 307. First lower sliding groove; 308. Connecting column; 309. Rear slider; 310. Second upper inclined surface; 311. Second upper sliding groove; 312. Second lower inclined surface; 313. Second lower sliding groove. Detailed Implementation

[0028] To make the technical problems, solutions, and beneficial effects of this invention clearer, the 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 merely illustrative and not intended to limit the invention.

[0029] Please refer to Figures 1 to 7The present invention provides a specific embodiment of an atlantoaxial fusion device, comprising a fusion plate assembly and a height adjustment assembly. The fusion plate assembly includes an upper fusion plate 101 and a lower fusion plate 201, which are symmetrically arranged. The height adjustment assembly is disposed between the upper fusion plate 101 and the lower fusion plate 201 and includes a mounting base 301, a front slider 303, and a rotating bolt 302. The rotating bolt 302 passes through the mounting base 301 and the front slider 303 sequentially from front to back. The rotating bolt 302 is rotatably connected to the mounting base 301 and threadedly connected to the front slider 303. The upper and lower end faces of the front slider 303 are respectively symmetrically arranged first... The height of the upper inclined surface 304 and the first lower inclined surface 306, and the front slider 303 gradually decreases as it approaches the mounting base 301. The front end of the upper fusion plate 101 is provided with an upper limit groove 102 for limiting the upper end of the mounting base 301, and the front end of the lower fusion plate 201 is provided with a lower limit groove 202 for limiting the lower end of the mounting base 301. The first upper inclined surface 304 is provided with a first upper sliding groove 305, and the lower end surface of the upper fusion plate 101 is provided with a first upper slider 103 that matches the first upper sliding groove 305. The first lower inclined surface 306 is provided with a first lower sliding groove 307, and the upper end surface of the lower fusion plate 201 is provided with a first lower slider 203 that matches the first lower sliding groove 307.

[0030] This invention provides an atlantoaxial fusion device that, compared to existing technologies, includes a fusion plate assembly and a height adjustment assembly. The fusion plate assembly comprises an upper fusion plate 101 and a lower fusion plate 201 symmetrically arranged. The height adjustment assembly is positioned between the upper fusion plate 101 and the lower fusion plate 201 and is used to adjust the distance between them. The height adjustment assembly includes a mounting base 301, a front slider 303, and a rotating bolt 302. The mounting base 301 is positioned in front of the front slider 303. The rotating bolt 302 passes through the mounting base 301 and the front slider 303 from front to back and is threadedly connected to the front slider 303. The upper and lower end faces of the front slider 303 are a first upper inclined surface 304 and a first lower inclined surface 306, respectively. A first upper sliding groove 305 is provided on the first upper inclined surface 304. A first upper slider 103 is provided on the lower end face of the upper fusion plate 101. The device is slidably mounted in the first upper sliding groove 305. The upper end face of the front slider 303 is slidably connected to the upper fusion plate 101. A first lower sliding groove 307 is provided on the first lower inclined surface 306. A first lower slider 203 is provided on the upper end face of the lower fusion plate 201. The first lower slider 203 is slidably mounted in the first lower sliding groove 307. The lower end face of the front slider 303 is slidably connected to the lower fusion plate 201. An upper limit groove 102 is provided at the front end of the upper fusion plate 101, and a lower limit groove 202 is provided at the front end of the lower fusion plate 201. The upper limit groove 102 and the lower limit groove 202 limit the mounting base 301 between the two, preventing the mounting base 301 from shifting in the front-back direction and increasing the stability of the device. By rotating the rotating bolt 302, the front slider 303 moves toward the mounting base 301, opening up the upper fusion plate 101 and the lower fusion plate 201, realizing the adjustment of the height of the fusion device, adapting to various situations, avoiding multiple trial moldings, and reducing harm to the patient.

[0031] For details, please refer to Figures 1 to 7The system includes a fusion plate assembly and a height adjustment assembly. The fusion plate assembly includes an upper fusion plate 101 and a lower fusion plate 201. The height adjustment assembly includes a mounting base 301, a front slider 303, and a rotating bolt 302. The upper fusion plate 101 and the lower fusion plate 201 are symmetrically arranged vertically. The mounting base 301, the front slider 303, and the rotating bolt 302 are positioned between the upper fusion plate 101 and the lower fusion plate 201. The tail end of the rotating bolt 302 sequentially passes through the mounting base 301 and the front slider 303. The mounting base 301 restricts the displacement of the rotating bolt 302 in its length direction. The rotating bolt 302 is rotatably disposed within the mounting base 301. The mounting base 301 is defined along the length direction of the rotating bolt 302. 01 One side is the front end, and the other end of the front slider 303 is defined as the rear end. That is, the front slider 303 is set on the rear side of the mounting base 301. The rotating bolt 302 is threadedly connected to the front slider 303. The upper end surface of the front slider 303 is the first upper inclined surface 304, and the lower end surface of the front slider 303 is the first lower inclined surface 306. The first upper inclined surface 304 and the first lower inclined surface 306 are symmetrically arranged. The height of the front slider 303 gradually increases from the front end to the rear end. The front end of the upper fusion plate 101 is provided with an upper limit groove 102, and the front end of the lower fusion plate 201 is provided with a lower limit groove 202. The upper limit groove 102 and the lower limit groove 202 can be closed to form a complete limit groove. The rear side wall of the mounting base 301 abuts against the upper limit groove 102. The bottom of the lower limiting groove 202 and the upper limiting groove 102 are combined to limit the mounting base 301 between them, preventing the mounting base 301 from shifting in the front-back direction. A first upper sliding groove 305 is provided on the first upper inclined surface 304, and the first upper sliding groove 305 is provided along the length direction of the first upper inclined surface 304. A first upper slider 103 is provided on the lower end face of the upper fusion plate 101, and the first upper slider 103 is slidably disposed in the first upper sliding groove 305. The upper end face of the front slider 303 is slidably connected to the upper fusion plate 101 through the first upper sliding groove 305. A first lower sliding groove 307 is provided on the first lower inclined surface 306, and the first lower sliding groove 307 is slidably disposed along the length direction of the upper fusion plate 101. The lower fusion plate 201 is set along the length direction of the first lower inclined surface 306. The upper end surface of the lower fusion plate 201 is provided with a first lower slider 203. The first lower slider 203 is slidably set in the first lower sliding groove 307. The lower end surface of the front slider 303 is slidably connected to the lower fusion plate 201. By rotating the rotating bolt 302, the front slider 303 moves towards the mounting base 301. Under the action of the first upper inclined surface 304 and the first lower inclined surface 306, the upper fusion plate 101 and the lower fusion plate 201 are opened. The upper fusion plate 101 moves upward relative to the mounting base 301, and the lower fusion plate 201 moves downward relative to the mounting base 301, so as to realize the adjustment of the height of the fusion device, adapt to various situations, avoid multiple trial moldings, and reduce harm to the patient.

[0032] As a specific embodiment of the atlantoaxial expandable fusion device provided by the present invention, please refer to Figures 1 to 7The fusion plate assembly and the height adjustment assembly are 3D printed components. The upper end surface of the upper fusion plate 101 and the lower end surface of the lower fusion plate 201 are provided with microporous structures to facilitate healing.

[0033] As a specific embodiment of the atlantoaxial expandable fusion device provided by the present invention, please refer to Figures 1 to 7 The cross-section of the first upper slider 103 is L-shaped, and the cross-section of the first upper groove 305 is L-shaped.

[0034] For details, please refer to Figures 1 to 7 The first upper slider 103 has an L-shaped cross section perpendicular to its length direction, and the first upper slide groove 305 has an L-shaped cross section perpendicular to its length direction. The first upper slider 103 matches the first upper slide groove 305 and is slidably disposed within the first upper slide groove 305 to prevent the first upper slider 103 from falling out of the first upper slide groove 305 and to increase the stability of the sliding connection.

[0035] For further details, please refer to Figures 1 to 7 The first lower slider 203 and the first upper slider 103 are arranged opposite each other with the plane where the rotating bolt 302 is located as the axis of symmetry, and the first lower slide groove 307 and the first upper slide groove 305 are arranged opposite each other to increase the stability of the device.

[0036] As a specific embodiment of the atlantoaxial expandable fusion device provided by the present invention, please refer to Figures 1 to 7 There are two sets of first upper sliders 103, which are symmetrically arranged and located on both sides of the rotating bolt 302.

[0037] For details, please refer to Figures 1 to 7 The first upper slider 103 is provided in two sets, and the two sets of first upper sliders 103 are arranged on both sides of the rotating bolt 302, with the vertical plane where the rotating bolt 302 is located as the axis of symmetry. The first lower slider 203 is symmetrically arranged with the first upper slider 103 to increase the stability of sliding.

[0038] As a specific embodiment of the atlantoaxial expandable fusion device provided by the present invention, please refer to Figures 1 to 7 The rear end of the front slider 303 is provided with a connecting post 308, and the rear end of the connecting post 308 is provided with a rear slider 309. The upper and lower end faces of the rear slider 309 are respectively a second upper inclined surface 310 and a second lower inclined surface 312 symmetrically arranged. The height of the rear slider 309 gradually decreases as it approaches the mounting base 301. The rear slider 309 is located between the upper fusion plate 101 and the lower fusion plate 201.

[0039] For details, please refer to Figures 1 to 7The connecting post 308 is vertically disposed on the rear end face of the front slider 303, and the rear slider 309 is disposed on the rear end face of the connecting post 308. The upper end face of the rear slider 309 is a second upper inclined surface 310 parallel to the first upper inclined surface 304, and the lower end face of the rear slider 309 is a second lower inclined surface 312 parallel to the first lower inclined surface 306. The second upper inclined surface 310 and the second lower inclined surface 312 are symmetrically disposed. The height of the rear slider 309 gradually increases from the front end to the rear end. The distance change between the second upper inclined surface 310 and the second lower inclined surface 312 is consistent with the distance change between the first upper inclined surface 304 and the first lower inclined surface 306, thereby improving the stability of the device.

[0040] As a specific embodiment of the atlantoaxial expandable fusion device provided by the present invention, please refer to Figures 1 to 7 The second upper inclined surface 310 is provided with a second upper sliding groove 311, the upper fusion plate 101 is provided with a second upper sliding block 104 that matches the second upper sliding groove 311, the second lower inclined surface 312 is provided with a second lower sliding groove 313, and the lower fusion plate 201 is provided with a second lower sliding block 204 that matches the second lower sliding groove 313.

[0041] For details, please refer to Figures 1 to 7 A second upper sliding groove 311 is provided on the second upper inclined surface 310, and the second upper sliding groove 311 is provided along the length direction of the second upper inclined surface 310. A second upper slider 104 is provided on the lower end face of the upper fusion plate 101, and the second upper slider 104 is slidably disposed in the second upper sliding groove 311. The upper end face of the rear slider 309 is slidably connected to the upper fusion plate 101 through the second upper sliding groove 311. A second lower sliding groove 313 is provided on the second lower inclined surface 312, and the second lower sliding groove 313 is provided along the length direction of the second lower inclined surface 312. A second lower slider 204 is provided on the upper end face of the lower fusion plate 201, and the second lower slider 204 is slidably disposed in the second lower sliding groove 313. The lower end face of the rear slider 309 is slidably connected to the lower fusion plate 201.

[0042] As a specific embodiment of the atlantoaxial expandable fusion device provided by the present invention, please refer to Figures 1 to 7 The rear end of the upper fusion plate 101 is a third upper inclined surface 105 that matches the second upper inclined surface 310, and the second upper slider 104 is disposed on the third upper inclined surface 105.

[0043] For details, please refer to Figures 1 to 7 The rear end of the upper fusion plate 101 is a third upper inclined surface 105, which matches the second upper inclined surface 310. The second upper slider 104 is set on the third upper inclined surface 105. The rear end of the lower fusion plate 201 is a third lower inclined surface 205, which matches the second lower inclined surface 312. The second lower slider 204 is set on the third lower inclined surface 205 to facilitate the sliding of the rear slider 309.

[0044] As a specific embodiment of the atlantoaxial expandable fusion device provided by the present invention, please refer to Figures 1 to 7 There are two sets of second upper sliders 104, which are arranged in parallel and on both sides of the rotating bolt 302.

[0045] For details, please refer to Figures 1 to 7 The second upper slider 104 is provided in two sets, and the two sets of second upper sliders 104 are arranged on both sides of the rotating bolt 302, with the vertical plane where the rotating bolt 302 is located as the axis of symmetry. The second lower slider 204 is symmetrically arranged with the second upper slider 104 to increase the stability of sliding.

[0046] As a specific embodiment of the atlantoaxial expandable fusion device provided by the present invention, please refer to Figures 1 to 7 There are two sets of connecting columns 308, which are arranged in parallel and on both sides of the rotating bolt 302.

[0047] For details, please refer to Figures 1 to 7 Two sets of connecting columns 308 are provided, which are located on both sides of the rotating bolt 302 and are arranged opposite each other with the vertical plane where the rotating bolt 302 is located as the axis of symmetry to increase the stability of sliding.

[0048] As a specific embodiment of the atlantoaxial expandable fusion device provided by the present invention, please refer to Figures 1 to 7 The vertical cross-section of the mounting base 301 is square, and the rotating bolt 302 is located at the center of the mounting base 301.

[0049] For details, please refer to Figures 1 to 7 The mounting base 301 has a square cross-section in the direction perpendicular to the front and rear ends, which facilitates the upper fusion plate 101 to slide upward relative to the mounting base 301 and the lower fusion plate 201 to slide downward relative to the mounting base 301. The rotating bolt 302 is set at the center of the mounting base 301 to increase the stability of the device.

[0050] As a specific embodiment of the atlantoaxial expandable fusion device provided by the present invention, please refer to Figures 1 to 7 The width of the upper fusion plate 101 gradually increases from the front end to the rear end.

[0051] For details, please refer to Figures 1 to 7The width of the upper fusion plate 101 gradually increases from the front end to the rear end. The upper fusion plate 101 is provided with an upper weight-reducing groove 106. The upper end surface of the upper fusion plate 101 is provided with a trabecular bone structure to facilitate fusion with the bone surface. The width of the lower fusion plate 201 gradually increases from the front end to the rear end. The lower fusion plate 201 is provided with a lower weight-reducing groove 206. The lower end surface of the lower fusion plate 201 is provided with a trabecular bone structure to facilitate fusion with the bone surface.

[0052] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An atlantoaxial prosthesis, comprising: The application relates to a fusion plate assembly and a height adjusting assembly, the fusion plate assembly comprises an upper fusion plate and a lower fusion plate, the upper fusion plate and the lower fusion plate are symmetrically arranged, the height adjusting assembly is arranged between the upper fusion plate and the lower fusion plate, and the height adjusting assembly comprises a mounting seat, a front sliding block and a rotating bolt, the rotating bolt sequentially penetrates the mounting seat and the front sliding block from front to back, the rotating bolt is rotationally connected with the mounting seat and is threadedly connected with the front sliding block, the upper and lower end faces of the front sliding block are respectively a first upper inclined surface and a first lower inclined surface which are symmetrically arranged, the height of the front sliding block gradually decreases when approaching the mounting seat, the front end of the upper fusion plate is provided with an upper limiting groove for limiting the upper end of the mounting seat, the front end of the lower fusion plate is provided with a lower limiting groove for limiting the lower end of the mounting seat, a first upper sliding groove is arranged on the first upper inclined surface, the lower end face of the upper fusion plate is provided with a first upper sliding block matched with the first upper sliding groove, a first lower sliding groove is arranged on the first lower inclined surface, and the upper end face of the lower fusion plate is provided with a first lower sliding block matched with the first lower sliding groove.

2. The atlantoaxial distractible cage of claim 1, wherein, The cross section of the first upper sliding block is L-shaped, and the cross section of the first upper sliding groove is L-shaped.

3. The Cervico-Arcual Spreading Fusion Cage of claim 2, wherein, The first upper sliding block is provided with two groups, the two groups of first upper sliding blocks are symmetrically arranged and are arranged on the two sides of the rotating bolt.

4. The Cervical Spinal Prosthetic Fusion Device of claim 1, wherein, The rear end of the front sliding block is provided with a connecting column, the rear end of the connecting column is provided with a rear sliding block, the upper and lower end faces of the rear sliding block are respectively a second upper inclined surface and a second lower inclined surface which are symmetrically arranged, the height of the rear sliding block gradually decreases when approaching the mounting seat, and the rear sliding block is arranged between the upper fusion plate and the lower fusion plate.

5. The Cervical Spinal Proximal Expandable Fusion Cage of claim 4, wherein, A second upper sliding groove is arranged on the second upper inclined surface, the upper end of the upper fusion plate is provided with a second upper sliding block matched with the second upper sliding groove, a second lower sliding groove is arranged on the second lower inclined surface, and the upper end of the lower fusion plate is provided with a second lower sliding block matched with the second lower sliding groove.

6. The Cervico-Arcual Spreading Fusion Cage of claim 5, wherein, The rear end of the upper fusion plate is a third upper inclined surface matched with the second upper inclined surface, and the second upper sliding block is arranged on the third upper inclined surface.

7. The atlantoaxial prosthesis of Claim 6, wherein, The second upper sliding block is provided with two groups, the two groups of second upper sliding blocks are parallelly arranged and are arranged on the two sides of the rotating bolt.

8. The Cervical Spinal Proximal Expandable Fusion Cage of claim 4, wherein, The connecting column is provided with two groups, the two groups of connecting columns are parallelly arranged and are arranged on the two sides of the rotating bolt.

9. The Cervical Spinal Prosthetic Fusion Device of claim 1, wherein, The vertical cross section of the mounting seat is square, and the rotating bolt is arranged at the center of the mounting seat.

10. The Cervico-Axis Spine Expandable Fusion Cage of claim 1 wherein, The width of the upper fusion plate gradually increases from the front end to the rear end.

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