Vertebral replacement device

Abstract

The present invention relates to a vertebral replacement device, comprising a main body structure, wherein the main body structure comprises an upper support seat, a lower support seat, an upper end cover and a lower end cover, wherein the upper support seat and the lower support seat are slidably matched, wherein the upper end cover is arranged at the end of the upper support seat, and the lower end cover is arranged at the end of the lower support seat, and the innovation point thereof is that it also comprises a main body anti-displacement auxiliary structure, wherein the main body anti-displacement auxiliary structure comprises a plurality of support rods and a plurality of locking seats for connecting with connecting rods, wherein the two ends of the upper end cover and the lower end cover are respectively provided with support rods, and each support rod is respectively connected with a corresponding locking seat, so that the main body structure and the main body anti-displacement auxiliary structure and the connecting rod connected with the locking seat form an integrated structure. The present invention can effectively prevent displacement.

Description

Technical Field

[0001] The invention relates to a replacement device, in particular to a vertebral replacement device, and belongs to the technical field of medical devices. Background Art

[0002] The stability of the spine will undoubtedly be destroyed after the vertebral body is removed. Reconstructing the structure and function of the spine is a necessary condition for maintaining the normal biomechanical stability of the spine. The vertebral replacement device is used for bone grafting reconstruction and fusion of the vertebral body. During the operation, in order to improve the fusion effect caused by bone healing, the inner cavity of the main structure of the product is filled with autologous bone. The end caps at both ends of the main structure are respectively against the end faces of the upper and lower vertebral bodies, so that the fusion device produces mechanical support and the implanted autologous bone undergoes bone healing to achieve fusion between the vertebrae. Since the spine itself has a certain physiological curvature, after the vertebral replacement device is implanted, the vertebrae located above and below the vertebral replacement device will be squeezed after bending. Therefore, during the squeezing process, the position of the replacement device will be displaced forward and backward. Once displacement occurs, the operation will fail, and even cause lesions in severe cases. Summary of the invention

[0003] The purpose of the present invention is to provide a vertebral replacement device which can effectively prevent displacement.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the present invention is: a vertebral replacement device, including a main structure, the main structure includes an upper support seat, a lower support seat, an upper end cover and a lower end cover, the upper support seat and the lower support seat are slidably matched, the upper end cover is arranged at the end of the upper support seat, and the lower end cover is arranged at the end of the lower support seat, and its innovative points are:

[0005] It also includes a main body anti-displacement auxiliary structure, which includes a plurality of support rods and a plurality of locking seats for connecting with the connecting rods. Support rods are respectively provided at both ends of the upper end cover and the lower end cover, and each support rod is respectively connected with the corresponding locking seat, so that the main body structure and the main body anti-displacement auxiliary structure and the connecting rod connected with the locking seat form an integrated structure.

[0006] In the above technical solution, upper connecting ears are respectively provided at both ends of the upper end cover, the upper connecting ears have an upper ball head inner hole, and the hole wall of the upper ball head inner hole is provided with partial threads, and lower connecting ears are respectively provided at both ends of the lower end cover, the lower connecting ears have a lower ball head inner hole, and the hole wall of the lower ball head inner hole is provided with partial threads, one end of each support rod has a ball head, and the surface of the ball head has an external thread, and the ball head of each support rod is respectively arranged in the upper ball head inner hole of the upper connecting ear and the lower ball head inner hole of the lower connecting ear.

[0007] In the above technical solution, the locking seat has a support rod socket, a connecting rod slot and a locking hole that are interconnected. The other end of the support rod has a flat surface. The other end of the support rod is inserted into the support rod socket, and the flat surface of the support rod is against the hole wall of the support rod socket. The connecting rod is stuck in the connecting rod slot. A locking cam is provided in the locking hole. After rotating the locking cam, the locking cam is against one side of the connecting rod, and the other side of the connecting rod is against the support rod, so that the support rod, the locking seat and the connecting rod are locked as one.

[0008] In the above technical solution, the locking cam includes a threaded connector and a locking column which are integrated with each other. The threaded connector is threadedly connected to the locking hole, and the threaded connector has a hexagonal hole. The locking column has an eccentric plane. After rotating the locking cam, the eccentric plane of the locking cam abuts against one side of the connecting rod.

[0009] The above technical solution also includes a main body height adjustment mechanism, which includes an adjustment sleeve and an anti-rotation mechanism for preventing the adjustment sleeve from rotating. The adjustment sleeve is sleeved on the outer periphery of the end of the lower support seat and is located on the inner side of the upper end cover. The adjustment sleeve is threadedly connected to the upper support seat. By rotating the adjustment sleeve, the upper support seat can move up and down relative to the lower support seat; the anti-rotation mechanism includes a locking nut. A locking nut threadedly connected to the lower support seat is provided at the upper part of the lower support seat and close to the adjustment sleeve. The adjustment sleeve has a plurality of tooth grooves. The locking nut is rotated, and the end of the locking nut can be stuck in the tooth groove corresponding to the adjustment sleeve.

[0010] In the above technical solution, an anti-slip groove is provided on the inner wall of the adjustment sleeve, and the end of the lower support seat has a boss, and the boss is arranged in the anti-slip groove of the adjustment sleeve.

[0011] In the above technical solution, the main body height adjustment mechanism also includes an adjustment sleeve limiting structure, the adjustment sleeve limiting structure includes a limiting nut, the lower part of the upper support seat has a limiting nut, and the adjustment sleeve can be rotated to make it abut against the limiting nut.

[0012] In the above technical scheme, the upper end cover has an upper connecting ring, an upper clamping ring and an upper bone grafting bin which are arranged in sequence from top to bottom and are integrated with each other or fixedly connected, the end face of the upper connecting ring has an upper anti-slip surface and an anti-displacement upper tooth tip, and the anti-displacement upper tooth tip is located on the inner side of the upper anti-slip surface, the upper clamping ring is tightly matched with the inner hole of the upper support seat, the upper bone grafting bin is located in the inner cavity of the upper support seat, and the upper bone grafting bin is provided with upper growth holes arranged in a honeycomb shape; the lower end cover has a lower connecting ring, a lower clamping ring and a lower bone grafting bin which are integrated with each other or fixedly connected, and are arranged in sequence from top to bottom, the end face of the lower connecting ring has a lower anti-slip surface and an anti-displacement lower tooth tip, and the anti-displacement lower tooth tip is located on the inner side of the lower anti-slip surface, the lower clamping ring is tightly matched with the inner hole of the lower support seat, the lower bone grafting bin is located in the inner cavity of the lower support seat, and the lower bone grafting bin is provided with lower growth holes arranged in a honeycomb shape.

[0013] In the above technical solution, the upper retaining ring of the upper end cover has two groups of notches arranged symmetrically, and an upper elastic sheet is disposed between adjacent notches, and the upper elastic sheet is tightly fitted with the inner hole of the upper support seat; the lower retaining ring of the lower end cover has two groups of notches arranged symmetrically, and a lower elastic sheet is disposed between adjacent notches, and the lower elastic sheet is tightly fitted with the inner hole of the lower support seat.

[0014] In the above technical solution, the upper support seat has an upper connecting ring seat and threaded sheets connected to and evenly distributed with the upper connecting ring seat, and insertion grooves are provided between adjacent threaded sheets. The lower support seat has a lower connecting ring seat and guide sheets connected to and evenly distributed with the lower connecting ring seat, and guide grooves are provided between adjacent guide sheets. The threaded sheets of the upper support seat are slidably matched with the guide grooves of the lower support seat, and the guide sheets of the lower support seat are slidably matched with the insertion grooves of the upper support seat.

[0015] The positive effect of the present invention is: after adopting the vertebral replacement device of the present invention, since the present invention also includes a main body anti-displacement auxiliary structure, the main body anti-displacement auxiliary structure includes multiple support rods and multiple locking seats for connecting with the connecting rods, the two ends of the upper end cover and the lower end cover are respectively provided with support rods, and each support rod is respectively connected to the corresponding locking seat, so that the main structure and the main body anti-displacement auxiliary structure and the connecting rod connected to the locking seat form an integrated structure. When in use, the main structure is implanted between the damaged vertebrae, and the upper end cover and the lower end cover are respectively abutted against the adjacent vertebrae, and the locking seat is clamped on the connecting rod connected to the pedicle screw. In this way, the main structure is fixed by using the main body anti-displacement auxiliary structure and the traditional nail-rod system to form an integrated frame structure, so that the main structure is no longer displaced due to the squeezing of the adjacent vertebrae by bending, thereby solving the defect of postoperative displacement of traditional artificial vertebrae. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the state in which the present invention and the conventional nail rod system are assembled as one;

[0017] Figure 2 It is a structural schematic diagram of a specific implementation mode of the present invention;

[0018] Figure 3 yes Figure 2 Schematic diagram of the three-dimensional structure;

[0019] Figure 4 yes Figure 2 A schematic diagram of the three-dimensional structure of the middle locking seat;

[0020] Figure 5 yes Figure 2 Schematic diagram of the structure of the middle support rod;

[0021] Figure 6 yes Figure 2 Structural diagram of the middle locking cam;

[0022] Figure 7 yes Figure 2 The structural diagram of the main structure in the middle;

[0023] Figure 8 yes Figure 7 AA cross-sectional view of ;

[0024] Fig. 9 yes Figure 7 Schematic diagram of the three-dimensional structure;

[0025] Fig.10 yes Fig. 9 A schematic diagram of the three-dimensional structure of the middle upper support seat;

[0026] Fig.11 yes Fig. 9 A schematic diagram of the three-dimensional structure of the middle and lower support seat;

[0027] Fig.12 yes Figure 8 The structural diagram of the middle adjustment sleeve;

[0028] Fig.13 yes Fig. 9 Structural schematic diagram of the middle and upper end cover;

[0029] Fig.14 yes Fig.13 A schematic diagram of the cross-sectional structure of the middle and upper connecting ears;

[0030] Fig.15 yes Fig.13 Schematic diagram of the three-dimensional structure;

[0031] Fig.16 yes Fig. 9 Schematic diagram of the structure of the middle and lower end covers. DETAILED DESCRIPTION

[0032] The present invention is further described below with reference to the accompanying drawings and given embodiments, but is not limited thereto.

[0033] like Figures 1 to 16 As shown, a vertebral replacement device includes a main structure 1, wherein the main structure 1 includes an upper support seat 11, a lower support seat 12, an upper end cover 13 and a lower end cover 14, wherein the upper support seat 11 is slidably matched with the lower support seat 12, the upper end cover 13 is arranged at the end of the upper support seat 11, and the lower end cover 14 is arranged at the end of the lower support seat 12.

[0034] It also includes a main body anti-displacement auxiliary structure 3, which includes a plurality of support rods 31 and a plurality of locking seats 32 for connecting with connecting rods. Support rods 31 are respectively provided at both ends of the upper end cover 13 and the lower end cover 14, and each support rod 31 is respectively connected with a corresponding locking seat 32, so that the main structure 1 and the main body anti-displacement auxiliary structure 3 and the connecting rod connected with the locking seat 32 form an integrated structure.

[0035] like Figure 3 , 5 As shown in , 13, 14, and 16, in order to facilitate the adjustment of the support rod, upper connecting ears 131 are respectively provided at both ends of the upper end cover 13, and the upper connecting ear 131 has an upper ball head inner hole 1311, and the hole wall of the upper ball head inner hole 1311 is provided with partial threads, and lower connecting ears 141 are respectively provided at both ends of the lower end cover 14, and the lower connecting ear 141 has a lower ball head inner hole 1411, and the hole wall of the lower ball head inner hole 1411 is provided with partial threads, one end of each support rod 31 has a ball head 311, and the surface of the ball head 311 has an external thread, and the ball head 311 of each support rod 31 is respectively arranged in the upper ball head inner hole 1311 of the upper connecting ear 131 and the lower ball head inner hole 1411 of the lower connecting ear 141. The ball head hole of the connecting ear of the present invention is half provided with threads and the other half is a smooth hole. When in use, the ball head 311 of the support rod 31 is screwed into the ball head inner hole of the connecting ear. After half of the ball head 311 exceeds half of the threads of the ball head hole, it can ensure that the ball head can rotate in any direction in the ball head hole and can also ensure that the ball head will not fall off.

[0036] like Figure 3 , 4As shown in Figure 6, the locking seat 32 has a support rod insertion hole 321, a connecting rod slot 322 and a locking hole 323 that are interpenetrating. The other end of the support rod 31 has a flat surface 312. The other end of the support rod 31 is inserted into the support rod insertion hole 321, and the flat surface 312 of the support rod 31 abuts against the hole wall of the support rod insertion hole 321. The connecting rod is stuck in the connecting rod slot 322. A locking cam 33 is provided in the locking hole 323. After the locking cam 33 is rotated, the locking cam 33 abuts against one side of the connecting rod, and the other side of the connecting rod abuts against the support rod 31, so that the support rod 31, the locking seat 32 and the connecting rod are locked as a whole. In order to make the structure more reasonable, it is convenient to lock the support rod and the connecting rod as a whole through the locking seat.

[0037] like Figure 6 As shown, in order to facilitate the locking of the connecting rod and the supporting rod, the locking cam 33 includes a threaded connector 331 and a locking column 332 which are integrated with each other. The threaded connector 331 is threadedly connected to the locking hole 323, and the threaded connector 331 has an inner hexagonal hole 3311. The locking column 323 has an eccentric plane. After the locking cam 33 is rotated, the eccentric plane of the locking cam 33 abuts against one side of the connecting rod. When in use, the tool is screwed into the inner hexagonal hole and the locking cam is rotated so that the threaded connector is threadedly connected to the locking hole 323 until the eccentric plane of the locking column 323 abuts against one side of the connecting rod, and the other side of the connecting rod abuts against the supporting rod, thereby completing the locking of the supporting rod and the connecting rod.

[0038] like Figure 7 , 8 As shown in Figures 9 and 10, in order to facilitate the adjustment of the height of the main body, the present invention also includes a main body height adjustment mechanism 2, the main body height adjustment mechanism 2 includes an adjustment sleeve 21 and an anti-rotation mechanism for preventing the adjustment sleeve 21 from rotating, the adjustment sleeve 21 is sleeved on the outer periphery of the end of the lower support seat 12 and is located on the inner side of the upper end cover 13, the adjustment sleeve 21 is threadedly connected to the upper support seat 11, and the upper support seat 11 can be moved up and down relative to the lower support seat 12 by rotating the adjustment sleeve 21; the anti-rotation mechanism includes a locking nut 22, the lower support seat 12 A locking nut 22 threadedly connected to the adjusting sleeve 21 is provided at the upper part thereof and close to the adjusting sleeve 21. The adjusting sleeve 21 has a plurality of tooth grooves 211. The locking nut 22 is rotated, and the end of the locking nut 22 can be stuck in the tooth groove 211 corresponding to the adjusting sleeve 21. The end of the locking nut 22 has a limiting cylinder, and the limiting cylinder has a slot. By screwing the tool into the slot and rotating the locking nut, the limiting cylinder at the end of the locking nut 22 can be stuck in the tooth groove corresponding to the adjusting sleeve 21, so as to position the adjusting sleeve 21 and effectively prevent the adjusting sleeve from rotating.

[0039] like Figure 8 , 11As shown in Figures 12, in order to prevent the adjustment sleeve from falling off from the lower support seat 12, an anti-falling groove 212 is provided on the inner wall of the adjustment sleeve 21, and a boss 124 is provided at the end of the lower support seat 12, and the boss 124 is arranged in the anti-falling groove 212 of the adjustment sleeve 21. In this way, it can be ensured that the boss 124 of the lower support seat 12 is always arranged in the anti-falling groove of the adjustment sleeve 21.

[0040] like Figure 8 , 11 As shown, in order to limit the stroke of the adjustment sleeve, the main body height adjustment mechanism 2 also includes an adjustment sleeve limiting structure, and the adjustment sleeve limiting structure includes a limiting nut 23. The lower part of the upper support seat 11 has a limiting nut 23, and the adjustment sleeve 21 is rotated to make it abut against the limiting nut 23. In this way, when the upper support seat 11 moves upward relative to the lower support seat, the movable stroke is until the adjustment sleeve abuts against the limiting nut after the adjustment sleeve moves downward, which can effectively prevent the adjustment sleeve from falling off from the bottom of the lower support seat 12.

[0041] In the prior art, the main structure includes an upper support seat and a lower support seat. According to different positions of the bone graft, a main structure with matching sizes needs to be selected. In order to be suitable for vertebral replacement at different positions, end caps of different sizes can be selected, and the main structure does not need to be changed, which reduces the cost and makes the present invention more versatile. Fig.13 , 14As shown in Figures 15 and 16, the upper end cover 13 has an upper connecting ring 132, an upper clamping ring 133 and an upper bone grafting bin 134 which are arranged in sequence from top to bottom and are integrated with each other or fixedly connected. The two ends of the upper connecting ring 132 are respectively provided with upper connecting ears 131. The end surface of the upper connecting ring 132 has an upper anti-slip surface 135 and an anti-displacement upper tooth tip 136, and the anti-displacement upper tooth tip 136 is located on the inner side of the upper anti-slip surface 135. The upper clamping ring 133 is tightly matched with the inner hole of the upper support seat 11. The upper bone grafting bin 134 is located in the inner cavity of the upper support seat 11, and the upper bone grafting bin 134 is provided with an upper growth plate 135 arranged in a honeycomb shape. Hole 137; the lower end cover 14 has a lower connecting ring 142, a lower clamping ring 143 and a lower bone grafting chamber 144 which are arranged in sequence from top to bottom and are integrated or fixedly connected to each other. The two ends of the lower connecting ring 142 are respectively provided with lower connecting ears 141. The end face of the lower connecting ring 142 has a lower anti-slip surface 145 and an anti-displacement lower tooth tip 146, and the anti-displacement lower tooth tip 146 is located on the inner side of the lower anti-slip surface 145. The lower clamping ring 143 is tightly matched with the inner hole of the lower support seat 12. The lower bone grafting chamber 144 is located in the inner cavity of the lower support seat 12, and the lower bone grafting chamber 144 is provided with lower growth holes 147 arranged in a honeycomb shape. When in use, a suitable end cover can be selected according to the bone grafting position, and according to the needs of the operation, the bone grafting chamber of the end cover can be supplemented with bone filling to prevent the gap between the implanted bone and the bone body, which affects bone healing and bone growth. The end faces of the end covers are all inclined surfaces, and inclined surfaces of different angles can be selected according to actual needs. The structures of the upper end cover and the lower end cover are completely the same.

[0042] like Fig.13 , 16 As shown, in order to ensure that the snap ring of the end cover can be tightened in the inner hole of the support seat to prevent it from falling off, the upper snap ring 133 of the upper end cover 13 has two groups of notches arranged symmetrically, and an upper elastic sheet 138 is disposed between adjacent notches, and the upper elastic sheet 138 is tightly matched with the inner hole of the upper support seat 11, and the lower snap ring 143 of the lower end cover 14 has two groups of notches arranged symmetrically, and a lower elastic sheet 148 is disposed between adjacent notches, and the lower elastic sheet 148 is tightly matched with the inner hole of the lower support seat 12. The outer peripheral wall of the elastic sheet has an arc-shaped protrusion, and the arc-shaped protrusion of the elastic sheet can be tightened in the inner hole of the support seat and tightly matched therewith.

[0043] like Fig.10 , 11As shown, in order to make the main structure more reasonable, the upper support seat 11 and the lower support seat 12 are both cylindrical structures, the upper support seat 11 has an upper connecting ring seat 111 and threaded sheets 112 connected to the upper connecting ring seat 111 and evenly distributed, and an insertion groove 113 is provided between adjacent threaded sheets 112, the lower support seat 12 has a lower connecting ring seat 121 and guide sheets 122 connected to the lower connecting ring seat 121 and evenly distributed, and a guide groove 123 is provided between adjacent guide sheets 122, the threaded sheets 112 of the upper support seat 11 are slidably matched with the guide groove 123 of the lower support seat 12, and the guide sheet 122 of the lower support seat 12 is slidably matched with the insertion groove 113 of the upper support seat 11. The guide sheet 122 of the lower support seat 12 has a boss 121 at its end. The insertion slot 113 is not only for the convenience of cooperation with the guide piece of the lower support seat, but also serves as a bone grafting window; the guide piece 122 is not only for the convenience of cooperation with the insertion slot 113 of the upper support seat, but also a bone filling hole is provided on the guide piece 122. During implantation, the length of the main structure of the present invention is the shortest. After implantation, the rotating sleeve is adjusted according to the length between the damaged vertebrae, and the upper support seat 11 moves relative to the lower support seat 12, so that the upper and lower end covers are against the adjacent vertebrae without any gaps, and according to surgical needs, bone grafting can be supplemented through the insertion slot 113 of the upper support seat 11 and the bone filling hole of the guide piece 122 of the lower support seat 12 to prevent the lack of bone grafting in the support seat and gaps, which affects subsequent bone growth.

[0044] When the present invention is used, the main structure 1 is implanted between damaged vertebrae in advance, and the length of the main structure 1 is adjusted according to the actual length of the damage, that is, the adjusting sleeve 21 is rotated by a tool to make the upper support seat 11 move upward relative to the lower support seat 12. After the length of the main structure is adjusted, the locking nut 22 is rotated so that its end can be stuck in the tooth groove 211 corresponding to the adjusting sleeve 21, and the adjusting sleeve 21 is positioned to prevent rotation. According to the needs of the operation, secondary bone grafting is performed in the bone grafting chamber of the end cover to prevent the formation of gaps due to the lack of bone grafting in the support seat. The upper end cover 13 and The anti-slip end surface and anti-displacement tooth tips of the lower end cover 14 are respectively abutted against the upper and lower adjacent vertebral end surfaces to prevent movement. After the main structure is fixed, the two ends of the support rod are respectively connected to the locking seat 32 and the connecting ears on the end cover. The connecting rod 4 connected to the pedicle screw 5 in the traditional nail-rod system is clamped on the locking seat 32. In this way, the main structure is fixed by the main anti-displacement auxiliary structure and the traditional nail-rod system to form an integrated frame structure, so that the main structure is no longer displaced due to the squeezing of the adjacent vertebral body by bending, thereby solving the defect of displacement of the traditional artificial vertebra after surgery.

[0045] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A vertebral replacement device, comprising a main structure (1), wherein the main structure (1) comprises an upper support seat (11), a lower support seat (12), an upper end cover (13) and a lower end cover (14), wherein the upper support seat (11) and the lower support seat (12) are slidably matched, the upper end cover (13) is arranged at the end of the upper support seat (11), and the lower end cover (14) is arranged at the end of the lower support seat (12), characterized in that: The main body anti-displacement auxiliary structure (3) is also included. The main body anti-displacement auxiliary structure (3) includes a plurality of support rods (31) and a plurality of locking seats (32) for connecting with the connecting rods. The upper end cover (13) and the lower end cover (14) are provided with support rods (31) at both ends, and each support rod (31) is connected to a corresponding locking seat (32), so that the main body structure (1), the main body anti-displacement auxiliary structure (3) and the connecting rod connected to the locking seat (32) form an integrated structure. The upper end cover (13) is provided with an upper connecting ear (131) at both ends, the upper connecting ear (131) has an upper ball head inner hole (1311), and the hole wall of the upper ball head inner hole (1311) is provided with a partial thread; the lower end cover (14) is provided with a lower connecting ear (141) at both ends, the lower connecting ear (141) has a lower ball head inner hole (1411), and the hole wall of the lower ball head inner hole (1411) is provided with a partial thread; one end of each support rod (31) has a ball head (311), and the surface of the ball head (311) has an external thread; the ball head (311) of each support rod (31) is respectively arranged in the upper ball head inner hole (1311) of the upper connecting ear (131) and the lower ball head inner hole (1411) of the lower connecting ear (141). The locking seat (32) comprises a support rod insertion hole (321), a connecting rod slot (322) and a locking hole (323) which are interpenetrating. The other end of the support rod (31) comprises a flat surface (312). The other end of the support rod (31) is inserted into the support rod insertion hole (321), and the flat surface (312) of the support rod (31) abuts against the hole wall of the support rod insertion hole (321). The connecting rod is clamped in the connecting rod slot (322). A locking cam (33) is provided in the locking hole (323). After the locking cam (33) is rotated, the locking cam (33) abuts against one side of the connecting rod, and the other side of the connecting rod abuts against the support rod (31), so that the support rod (31), the locking seat (32) and the connecting rod are locked as a whole.

2. The vertebral body replacement device according to claim 1, characterized in that: The locking cam (33) comprises a threaded connector (331) and a locking column (332) which are integrated with each other. The threaded connector (331) is threadedly connected to the locking hole (323), and the threaded connector (331) has a hexagonal hole (3311). The locking column (332) has an eccentric plane. After the locking cam (33) is rotated, the eccentric plane of the locking cam (33) abuts against a side surface of the connecting rod.

3. The vertebral body replacement device according to claim 1, characterized in that: The main body height adjustment mechanism (2) includes an adjustment sleeve (21) and an anti-rotation mechanism for preventing the adjustment sleeve (21) from rotating. The adjustment sleeve (21) is sleeved on the outer periphery of the end of the lower support seat (12) and is located on the inner side of the upper end cover (13). The adjustment sleeve (21) is threadedly connected to the upper support seat (11). The adjustment sleeve (21) is rotated to enable the upper support seat (11) to move up and down relative to the lower support seat (12). The anti-rotation mechanism includes a locking nut (22). A locking nut (22) threadedly connected to the lower support seat (12) is provided at the upper part of the lower support seat (12) and close to the adjustment sleeve (21). The adjustment sleeve (21) has a plurality of tooth grooves (211). When the locking nut (22) is rotated, the end of the locking nut (22) can be stuck in the tooth groove (211) corresponding to the adjustment sleeve (21).

4. The vertebral body replacement device according to claim 3, characterized in that: An anti-slip groove (212) is provided on the inner wall of the adjustment sleeve (21), and the end of the lower support seat (12) has a boss (124), and the boss (124) is arranged in the anti-slip groove (212) of the adjustment sleeve (21).

5. The vertebral body replacement device according to claim 3, characterized in that: The main body height adjustment mechanism (2) also includes an adjustment sleeve limiting structure, and the adjustment sleeve limiting structure includes a limiting nut (23). The lower part of the upper support seat (11) has a limiting nut (23), and the adjustment sleeve (21) can be rotated to make it abut against the limiting nut (23).

6. The vertebral body replacement device according to claim 1, characterized in that: The upper end cover (13) comprises an upper connecting ring (132), an upper clamping ring (133) and an upper bone grafting bin (134) which are arranged in sequence from top to bottom and are integrated with or fixedly connected to each other; the end surface of the upper connecting ring (132) comprises an upper anti-slip surface (135) and an anti-displacement upper tooth tip (136), and the anti-displacement upper tooth tip (136) is located on the inner side of the upper anti-slip surface (135); the upper clamping ring (133) is tightly matched with the inner hole of the upper support seat (11); the upper bone grafting bin (134) is located in the inner cavity of the upper support seat (11), and the upper bone grafting bin (134) is provided with upper growth holes (137) arranged in a honeycomb shape; The lower end cover (14) comprises a lower connecting ring (142), a lower clamping ring (143) and a lower bone grafting chamber (144) which are arranged in sequence from top to bottom and are integrated with or fixedly connected to each other; the end surface of the lower connecting ring (142) comprises a lower anti-slip surface (145) and an anti-displacement lower tooth tip (146), and the anti-displacement lower tooth tip (146) is located on the inner side of the lower anti-slip surface (145); the lower clamping ring (143) is tightly matched with the inner hole of the lower support seat (12); the lower bone grafting chamber (144) is located in the inner cavity of the lower support seat (12), and the lower bone grafting chamber (144) is provided with lower growth holes (147) arranged in a honeycomb shape.

7. The vertebral body replacement device according to claim 6, characterized in that: The upper retaining ring (133) of the upper end cover (13) has two groups of notches arranged symmetrically, and an upper elastic sheet (138) is disposed between adjacent notches. The upper elastic sheet (138) is tightly fitted with the inner hole of the upper support seat (11). The lower retaining ring (143) of the lower end cover (14) has two groups of notches arranged symmetrically, and a lower elastic sheet (148) is disposed between adjacent notches. The lower elastic sheet (148) is tightly fitted with the inner hole of the lower support seat (12).

8. The vertebral body replacement device according to claim 1, characterized in that: The upper support seat (11) comprises an upper connecting ring seat (111) and threaded sheets (112) connected to and evenly distributed on the upper connecting ring seat (111), and insertion grooves (113) are provided between adjacent threaded sheets (112); the lower support seat (12) comprises a lower connecting ring seat (121) and guide sheets (122) connected to and evenly distributed on the lower connecting ring seat (121), and guide grooves (123) are provided between adjacent guide sheets (122); the threaded sheets (112) of the upper support seat (11) are slidably matched with the guide grooves (123) of the lower support seat (12), and the guide sheets (122) of the lower support seat (12) are slidably matched with the insertion grooves (113) of the upper support seat (11).

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