Vertebral prosthesis

Abstract

The present invention provides a vertebral prosthesis comprising: a vertebral filler installed between two adjacent human vertebrae; a fixing member disposed on the side of the vertebral filler and positioned on the side of the human vertebrae; and a connecting assembly disposed between the vertebral filler and the fixing member, the fixing member being detachably connected to the vertebral filler via the connecting assembly. The technical solution of this application effectively solves the problem of poor stability of vertebral prostheses in related technologies.

Description

Technical Field

[0001] The present invention relates to medical devices, in particular to a vertebral prosthesis. Background Art

[0002] The cervical vertebrae, an important component of the spine, are located below the head and above the thoracic vertebrae. The cervical vertebrae not only support the weight of the head, but also have a large range of motion. With age, the lower cervical vertebrae are prone to degenerative changes, mainly manifested by thinning of the intervertebral discs, narrowing of the intervertebral spaces, and smaller intervertebral foramina. At the same time, bone spurs are prone to grow on the edges of the vertebrae, compressing the roots of the spinal nerves and causing cervical spondylosis. When there are larger bone spurs behind the vertebrae, they can compress the spinal cord, causing unstable walking in the lower limbs, and in severe cases, difficulty urinating and defecating. If the bone spurs grow on the sides of the vertebrae, they can stimulate or compress the vertebral artery, causing dizziness, headaches, decreased vision, and other symptoms of insufficient blood supply to the brain.

[0003] In related technologies, the cervical spine may need to be removed due to degeneration, trauma, infection, tumors, etc., where the spinal cord and nerve roots are compressed, or the vertebral body is defective. After the vertebral body is removed, vertebral reconstruction is required to maintain spinal stability. Currently, clinical vertebral replacement surgery is a combination of vertebral prosthesis or titanium mesh and anterior plate fixation. The anterior plate does not directly fix the prosthesis, and the prosthesis has poor stability. In the long term, it is prone to complications of internal fixation failure such as sinking and displacement. In particular, multi-segment vertebral replacement is more risky and may even require a secondary revision surgery. Summary of the Invention

[0004] The main purpose of the present invention is to provide a vertebral prosthesis to solve the problem of poor stability of vertebral prostheses in related technologies.

[0005] In order to achieve the above-mentioned objectives, the present invention provides a vertebral prosthesis, comprising: a vertebral filler, installed between two adjacent human vertebrae; a fixing member, arranged on the side of the vertebral filler and located on the side of the human vertebrae; a connecting assembly, arranged between the vertebral filler and the fixing member, and the fixing member is detachably connected to the vertebral filler through the connecting assembly.

[0006] Furthermore, a first mounting hole is provided on the vertebral filler, a second mounting hole is provided on the fixing piece, and the connecting assembly includes a connecting sleeve and a first fastener, the connecting sleeve is provided in the first mounting hole, and the first fastener is passed through the second mounting hole and the connecting sleeve to connect the vertebral filler and the fixing piece.

[0007] Furthermore, the first mounting hole includes a first hole section and a second hole section, the diameter of the first hole section is larger than the diameter of the second hole section, a first step structure is formed between the first hole section and the second hole section, a stop member is provided on the first step structure, and the connecting sleeve includes a connecting sleeve main body and a radial protrusion provided at the first end of the connecting sleeve main body, the radial protrusion is axially limited with the first step structure, and is anti-rotationally cooperated with the stop member.

[0008] Furthermore, the connecting sleeve also includes a plurality of expansion petals arranged at the second end of the connecting sleeve body and spaced apart along the circumference of the connecting sleeve body. The expansion petals have a contracted state and an expanded state. A connecting hole is formed in the center of the plurality of expansion petals. The connecting hole passes through the connecting sleeve body. The first fastener is inserted into the connecting hole to switch the expansion petals from the contracted state to the expanded state.

[0009] Furthermore, the outer side wall of each expansion petal is provided with a protrusion, and the first mounting hole also includes a third hole segment, which is provided at the second end of the second hole segment, and the diameter of the third hole segment is larger than the diameter of the second end of the second hole segment. A second step structure is provided between the third hole segment and the second hole segment, and the protrusion and the second step structure are axially limited.

[0010] Furthermore, the second hole segment is a tapered hole, the connecting sleeve body is a tapered structure, the tapered structure is installed in the tapered hole, and the diameter of the tapered hole gradually decreases in the direction from the first hole segment to the third hole segment.

[0011] Furthermore, the stopper is an arc-shaped rib, the radial convex portion is an arc-shaped convex portion, and two ends of the arc-shaped rib are limitedly matched with two ends of the arc-shaped convex portion.

[0012] Furthermore, the second mounting hole is a strip-shaped hole, the fixing member includes a fixing plate, a plurality of third mounting holes are provided on the fixing plate, and the vertebral prosthesis further includes a plurality of second fasteners, which are provided in a one-to-one correspondence with the third mounting holes.

[0013] Furthermore, the vertebral prosthesis also includes a first locking piece, which is arranged on the side of the fixing plate away from the vertebral filling piece, and the first locking piece cooperates with the first fastener stop; a slide groove is provided on the fixing plate, and the first locking piece includes a first plate body and a cam, the first plate body is movably arranged in the slide groove, and the cam is rotatably arranged in the slide groove, the first plate body is located between the cam and the first fastener, and the cam rotates to make the first plate body avoid the first fastener or the end of the first fastener of the stop part.

[0014] Furthermore, the vertebral prosthesis also includes a second locking piece, which includes a second plate body. The second plate body is rotatably arranged on the side of the fixing plate away from the vertebral filling piece, and the second plate body is arranged between two adjacent third mounting holes. The second plate body rotates to make the second plate body avoid the second fastener or stop the second fastener.

[0015] By applying the technical solution of the present invention, a vertebral filler is installed between two adjacent human vertebrae, a fixing piece is arranged on the side of the vertebral filler and is located on the side of the human vertebrae, a connecting assembly is arranged between the vertebral filler and the fixing piece, and the fixing piece is detachably connected to the vertebral filler through the connecting assembly. Through the above-mentioned arrangement, when implanted, the vertebral filler is first installed between two adjacent human vertebrae, supported and preliminarily fixed by the vertebral filler, and then the fixing piece is connected to the vertebral filler through the connecting assembly, and the fixing piece is abutted against the outer wall of the human vertebrae, and finally the fixing piece is fixedly connected to the human vertebrae, thus realizing the entire assembly process. Through the above-mentioned operation process, the position of the vertebral prosthesis can be made more stable, and it is not easy to loosen or fall out. Therefore, the technical solution of the present application effectively solves the problem of poor stability of the vertebral prosthesis in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of a vertebral prosthesis according to the present invention is shown;

[0018] Figure 2 Shown Figure 1 Schematic side view of the vertebral prosthesis;

[0019] Figure 3 Shown Figure 2 Schematic cross-sectional view of a vertebral prosthesis;

[0020] Figure 4 Shown Figure 1 Schematic diagram of the main view of the vertebral prosthesis;

[0021] Figure 5 Shown Figure 1 A schematic diagram of the three-dimensional structure of a connecting sleeve of a vertebral prosthesis;

[0022] Figure 6 Shown Figure 1 A schematic front view of a vertebral body filling piece of a vertebral body prosthesis;

[0023] Figure 7 Shown Figure 6 A rear view schematic diagram of a vertebral body filling piece;

[0024] Figure 8 Shown Figure 6 A schematic cross-sectional view of a vertebral body filler.

[0025] The above drawings include the following reference numerals:

[0026] 10. Vertebral filler; 11. First mounting hole; 111. First hole section; 112. Second hole section; 113. Third hole section; 12. First step structure; 121. Stopper; 13. Second step structure; 20. Fixing member; 21. Second mounting hole; 22. Fixing plate; 221. Third mounting hole; 30. Connecting assembly; 31. Connecting sleeve; 311. Connecting sleeve body; 312. Radial protrusion; 313. Expansion flap; 3131. Protruding edge; 314. Connecting hole; 32. First fastener; 40. Second fastener; 50. First locking member; 51. First plate; 52. Cam; 60. Second locking member. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0030] In order to improve the fixation effect of vertebral prosthesis, Figures 1 to 3 As shown, in this embodiment, a vertebral prosthesis includes a vertebral filler 10, a fixing member 20, and a connecting assembly 30. The vertebral filler 10 is installed between two adjacent human vertebrae. The fixing member 20 is disposed on the side of the vertebral filler 10 and is located on the side of the human vertebrae. The connecting assembly 30 is disposed between the vertebral filler 10 and the fixing member 20, and the fixing member 20 is detachably connected to the vertebral filler 10 via the connecting assembly 30.

[0031] According to the technical solution of the present embodiment, the vertebral filler 10 is installed between two adjacent human vertebrae, the fixing member 20 is arranged on the side of the vertebral filler 10 and is located on the side of the human vertebrae, the connecting assembly 30 is arranged between the vertebral filler 10 and the fixing member 20, and the fixing member 20 is detachably connected to the vertebral filler 10 through the connecting assembly 30. Through the above-mentioned arrangement, when implanted, the vertebral filler 10 is first installed between two adjacent human vertebrae, supported and preliminarily fixed by the vertebral filler 10, and then the fixing member 20 is connected to the vertebral filler 10 through the connecting assembly 30, and the fixing member 20 is abutted against the outer wall of the human vertebrae, and finally the fixing member 20 is fixedly connected to the human vertebrae, thus realizing the entire assembly process. Through the above-mentioned operation process, the position of the vertebral prosthesis can be made more stable, and it is not easy to loosen or fall out. Therefore, the technical solution of the present embodiment effectively solves the problem of poor stability of the vertebral prosthesis in the related art.

[0032] It should be noted that the above-mentioned fixing member 20 is located outside the human vertebral body.

[0033] In recent years, with the advancement of 3D printing technology, metal 3D-printed vertebral prostheses have become a promising alternative to vertebral body resection. 3D printing technology can produce prostheses that conform to the anatomical structure of the cervical spine and offer superior stability compared to titanium mesh. Furthermore, the 3D-printed porous structure, in contact with the final vertebral body, allows for bone ingrowth after surgery, reducing the risk of collapse and providing excellent biofixation. Therefore, the vertebral prosthesis in this example is also 3D-printed.

[0034] In order to reduce the difficulty of assembly, such as Figures 1 to 3 as well as Figure 8As shown, in this embodiment, a first mounting hole 11 is provided on the vertebral body filler 10, a second mounting hole 21 is provided on the fixing member 20, and a connecting assembly 30 includes a connecting sleeve 31 and a first fastener 32. The connecting sleeve 31 is disposed within the first mounting hole 11, and the first fastener 32 is inserted into the second mounting hole 21 and the connecting sleeve 31 to connect the vertebral body filler 10 and the fixing member 20. The structure of the first mounting hole 11 and the second mounting hole 21 is simple and easy to set up. The connecting sleeve 31 is installed in the first mounting hole 11, and the first fastener 32 is inserted into the second mounting hole 21 and connected to the connecting sleeve 31, thereby effectively connecting the fixing member 20 and the vertebral body filler 10 together.

[0035] like Figures 1 to 3 As shown, in this embodiment, the material of the fixing member 20 and the vertebral filler 10 is titanium alloy, and the material of the connecting sleeve 31 is ultra-high molecular weight polyethylene. Since the material of ultra-high molecular weight polyethylene is relatively soft compared to titanium alloy, the first fastener 32 can have a certain assembly error when connected to the connecting sleeve 31, which can effectively reduce the difficulty of assembly.

[0036] In order to stabilize the position of the connecting sleeve, Figures 1 to 3 as well as Figure 8 As shown, in this embodiment, the first mounting hole 11 includes a first hole section 111 and a second hole section 112. The diameter of the first hole section 111 is larger than the diameter of the second hole section 112. A first step structure 12 is formed between the first hole section 111 and the second hole section 112. A stopper 121 is provided on the first step structure 12. The connecting sleeve 31 includes a connecting sleeve body 311 and a radial protrusion 312 provided at the first end of the connecting sleeve body 311. The radial protrusion 312 is axially limited in cooperation with the first step structure 12 and is rotationally prevented in cooperation with the stopper 121. The first step structure 12 is limited in cooperation with the radial protrusion 312, that is, it can prevent the connecting sleeve 31 from moving toward the fixing member 20. In this way, the position of the connecting sleeve 31 can be stabilized, that is, the stability between the vertebral body filler 10 and the fixing member 20 can be indirectly improved. At the same time, due to the anti-rotation cooperation between the radial protrusion 312 and the stop member 121, that is, the stop member 121 can prevent the radial protrusion 312 from rotating, which can avoid the situation where the first fastener 32 cannot be connected to the connecting sleeve 31. In this way, the first fastener 32 is more efficient when rotating and can quickly connect the connecting sleeve 31 and the fixing member 20 together.

[0037] like Figures 1 to 6As shown, in this embodiment, the connecting sleeve 31 further includes a plurality of expansion flaps 313 disposed at the second end of the connecting sleeve body 311 and spaced apart along the circumference of the connecting sleeve body 311. The expansion flaps 313 have a contracted state and an expanded state. A connection hole 314 is formed at the center of the plurality of expansion flaps 313. The connection hole 314 extends through the connecting sleeve body 311. The first fastener 32 is inserted into the connection hole 314 to switch the expansion flaps 313 from the contracted state to the expanded state. The expansion flaps 313 have a simple structure and gaps between the plurality of expansion flaps 313. Therefore, when the first fastener 32 is connected to the expansion flaps 313, it can be connected by simply inserting it into the gaps between the expansion flaps 313. This further improves the fault tolerance of the first fastener 32 during connection. Furthermore, when the first fastener 32 is connected to the connection hole 314, it supports the expansion flaps 313, ensuring close contact between the expansion flaps 313 and the wall of the first mounting hole 11. This further improves the stability of the connecting sleeve 311 within the first mounting hole 11.

[0038] In this embodiment, the diameter of the first fastener 32 is larger than the diameter of the connecting hole 314, and the hardness of the material of the connecting sleeve 31 is lower than that of the first fastener 32, so that the first fastener 32 can be penetrated into the connecting hole 314 of the connecting sleeve 31, and the first fastener 32 and the connecting sleeve 31 are firmly connected; at the same time, the expansion flap 313 opens and the diameter becomes larger, so that the connection between the connecting sleeve 31 and the vertebral filler 10 is tightened, thereby realizing a fixed connection between the vertebral filler 10 and the fixing member 20.

[0039] In order to further ensure that the connecting sleeve is stably located in the first mounting hole, Figures 1 to 6 As shown, in this embodiment, the outer sidewall of each expansion petal 313 is provided with a flange 3131. The first mounting hole 11 also includes a third hole segment 113, which is provided at the second end of the second hole segment 112. The diameter of the third hole segment 113 is larger than the diameter of the second end of the second hole segment 112. A second step structure 13 is provided between the third hole segment 113 and the second hole segment 112. The flange 3131 and the second step structure 13 are axially limited. The flange 3131 has a simple structure and is easy to set up. The flange 3131 can be limited and matched with the second step structure 13, so that the connecting sleeve 31 can be stably set in the first mounting hole 11. Specifically, the assembly process of the connecting sleeve 31 of this embodiment is as follows: insert one end of the connecting sleeve 31 provided with the expansion petal 313 into the first hole section 111, and enter the second hole section 112 and the third hole section 113 in turn, so that the protrusion 3131 passes through the second hole section 112. At this time, the protrusion 3131 is limitedly engaged with the second step structure 13, thereby realizing the connection between the connecting sleeve 31 and the vertebral filler 10.

[0040] In this embodiment, the diameter of the expansion flap 313 is larger than the minimum diameter of the connecting hole 314. During the installation process, the expansion flap 313 undergoes elastic deformation and passes through the connecting hole 314. After installation, the expansion flap 313 is reset and fixed, limiting the movement of the connecting sleeve 31 in the hole direction; the radial protrusion 312 cooperates with the stop member 121 to limit the rotation of the connecting sleeve 31, and finally the connecting sleeve 31 is fixed on the vertebral filler 10.

[0041] like Figures 1 to 6 as well as Figure 8 As shown, in this embodiment, the second hole section 112 is a tapered hole, and the connecting sleeve body 311 is a tapered structure. The tapered structure is installed in the tapered hole, and the diameter of the tapered hole gradually decreases from the first hole section 111 to the third hole section 113. The tapered structure cooperates with the tapered hole, and the diameter of the tapered hole gradually decreases from the first hole section 111 to the third hole section 113. This improves the fixing effect of the first fastener 32 and prevents the radial protrusion 312 from being damaged due to excessive force.

[0042] In order to prevent the connecting sleeve from rotating, Figure 5 and Figure 7 As shown, in this embodiment, the stopper 121 is an arcuate rib, and the radial protrusion 312 is an arcuate protrusion. The two ends of the arcuate rib are limitedly matched with the two ends of the arcuate protrusion. The above-mentioned arcuate rib and arcuate protrusion have a simple structure and a good limiting effect.

[0043] like Figures 1 to 4 As shown, in this embodiment, the second mounting hole 21 is a strip-shaped hole. The fixing member 20 includes a fixing plate 22, which is provided with a plurality of third mounting holes 221. The vertebral prosthesis also includes a plurality of second fasteners 40, each corresponding to each of the third mounting holes 221. The second fasteners 40 penetrate into the third mounting holes 221 and connect to the human vertebral body, thereby improving the overall connection strength and position stability of the vertebral prosthesis. Furthermore, the strip-shaped second mounting holes 21 allow the first fasteners 32 to have a certain range of adjustment, i.e., a range of motion.

[0044] In order to prevent the first fastener from coming out, Figures 1 to 4As shown, in this embodiment, the vertebral prosthesis further includes a first locking member 50, which is disposed on the side of the fixing plate 22 away from the vertebral filler 10. The first locking member 50 engages with the first fastener 32. A sliding groove is provided on the fixing plate 22. The first locking member 50 includes a first plate 51 and a cam 52. The first plate 51 is movably disposed within the sliding groove, and the cam 52 is rotatably disposed within the sliding groove. The first plate 51 is positioned between the cam 52 and the first fastener 32. The cam 52 rotates to allow the first plate 51 to clear the first fastener 32 or to partially block the end of the first fastener 32. The first locking member 50 effectively holds the first fastener 32 in place, preventing it from being dislodged. Specifically, in this embodiment, after the first fastener 32 is installed, the cam 52 is actuated to push against the first plate 51, causing it to partially block the first fastener 32, thereby achieving complete locking. In addition, the two sides of the cam 52 are connected by screws, thereby achieving the limitation of the cam 52.

[0045] In order to prevent the second fastener from coming out, Figures 1 to 4 As shown, in this embodiment, the vertebral prosthesis also includes a second locking member 60, which includes a second plate. The second plate is rotatably disposed on a side of the fixing plate 22 away from the vertebral filler 10. The second plate is disposed between two adjacent third mounting holes 221. The second plate rotates so that the second plate avoids the second fasteners 40 or stops the second fasteners 40. The second locking member 60 can simultaneously lock two adjacent second fasteners 40. Specifically, two notches are symmetrically disposed on the second plate, the positions of the notches corresponding to the positions of the second fasteners 40. When assembling the second fasteners 40, the notches are aligned with the positions of the third mounting holes 221. After the second fasteners 40 are installed, the second plate is swung to offset the notches and the second mounting holes 21. This locks the second fasteners 40 and prevents them from falling out.

[0046] The vertebral prosthesis of this embodiment is composed of a vertebral filler 10, a connecting assembly 30 and a fixing member 20. The upper and lower ends of the vertebral filler 10 are an upper end plate and a lower end plate. The upper end plate and the lower end plate adopt an anatomical design, which can achieve a complete match with the bone contact surface and adopt a porous structure similar to bone trabeculae to achieve bone ingrowth after the vertebral prosthesis is implanted; the upper end plate and the lower end plate are provided with barbs, which achieve immediate stability after implantation and can limit displacement; the side wall of the vertebral filler 10 is provided with 4 adjustment holes, which are convenient for tools to adjust the position of the vertebral filler 10 during implantation; the vertebral filler 10 is provided with a clamping hole, which is convenient for tools to clamp the artificial vertebra for implantation; the anterior cervical plate is fixed to the adjacent vertebra of the fixing member 20 by a second fastener 40; the first fastener 32 is penetrated into the connecting sleeve 31 through the second mounting hole 21 on the fixing member 20, thereby achieving a fixed connection between the vertebral prosthesis and the anterior cervical plate. The vertebral body filler 10 and the fixing member 20 form a stable structure, and the vertebral body filler 10 and the fixing member 20 have greater anti-displacement ability, which greatly reduces the probability of vertebral prosthesis collapse and displacement and improves the patient's quality of life after surgery.

[0047] The vertebral prosthesis of this embodiment has a significant improvement in structural stability compared to the traditional method, and the surgical operation is not more difficult than the traditional method. The only additional operation is to insert the first fastener 32 into the connecting sleeve 31 through the second mounting hole 21. The surgical procedure is simple and easy to perform.

[0048] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0049] For ease of description, spatially relative terms such as "above," "on the upper surface of," "on top of," etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "on top of" other devices or structures would then be positioned as "below" or "below" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.

[0050] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0051] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A vertebral prosthesis, characterized in that: include: A vertebral body filling piece (10) is installed between two adjacent human vertebrae; A fixing member (20) is arranged on the side of the vertebral body filling member (10) and is located on the side of the human vertebral body; a connecting assembly (30) disposed between the vertebral body filling piece (10) and the fixing piece (20), wherein the fixing piece (20) is detachably connected to the vertebral body filling piece (10) via the connecting assembly (30); The vertebral body filling piece (10) is provided with a first mounting hole (11), the fixing piece (20) is provided with a second mounting hole (21), the connecting assembly (30) comprises a connecting sleeve (31) and a first fastener (32), the connecting sleeve (31) is provided in the first mounting hole (11), and the first fastener (32) is passed through the second mounting hole (21) and the connecting sleeve (31) to connect the vertebral body filling piece (10) and the fixing piece (20); The first mounting hole (11) comprises a first hole section (111) and a second hole section (112); the diameter of the first hole section (111) is larger than the diameter of the second hole section (112); a first step structure (12) is formed between the first hole section (111) and the second hole section (112); a stopper (121) is provided on the first step structure (12); the connecting sleeve (31) comprises a connecting sleeve body (311) and a radial protrusion (312) provided at a first end of the connecting sleeve body (311); the radial protrusion (312) is axially limitedly engaged with the first step structure (12) and is rotationally prevented engaged with the stopper (121); The connecting sleeve (31) further comprises a plurality of expansion flaps (313) arranged at the second end of the connecting sleeve body (311) and spaced apart along the circumference of the connecting sleeve body (311), wherein the expansion flaps (313) have a contracted state and an expanded state, and a connection hole (314) is formed at the center of the plurality of expansion flaps (313), wherein the connection hole (314) passes through the connecting sleeve body (311), and the first fastener (32) is inserted into the connection hole (314) so ​​that the expansion flap (313) switches from the contracted state to the expanded state, and the outer side wall of each expansion flap (313) is provided with a convex edge (3131).

2. The vertebral prosthesis according to claim 1, characterized in that The first mounting hole (11) further comprises a third hole section (113), the third hole section (113) being arranged at the second end of the second hole section (112), the diameter of the third hole section (113) being larger than the diameter of the second end of the second hole section (112), a second step structure (13) being arranged between the third hole section (113) and the second hole section (112), and the convex edge (3131) and the second step structure (13) being axially limitedly engaged.

3. The vertebral prosthesis according to claim 2, characterized in that The second hole section (112) is a tapered hole, the connecting sleeve body (311) is a tapered structure, the tapered structure is installed in the tapered hole, and the diameter of the tapered hole gradually decreases in the direction from the first hole section (111) to the third hole section (113).

4. The vertebral prosthesis according to claim 1, characterized in that The stopper (121) is an arc-shaped convex rib, the radial convex portion (312) is an arc-shaped convex portion, and the two ends of the arc-shaped convex rib are limitedly matched with the two ends of the arc-shaped convex portion.

5. The vertebral prosthesis according to claim 1, characterized in that The second mounting hole (21) is a strip-shaped hole, the fixing member (20) includes a fixing plate (22), a plurality of third mounting holes (221) are provided on the fixing plate (22), and the vertebral prosthesis further includes a plurality of second fasteners (40), and the second fasteners (40) are provided in a one-to-one correspondence with the third mounting holes (221).

6. The vertebral prosthesis according to claim 5, characterized in that The vertebral prosthesis further comprises a first locking member (50), the first locking member (50) being arranged on a side of the fixing plate (22) away from the vertebral filling member (10), and the first locking member (50) being engaged with the first fastener (32) as a stop; a slide groove is provided on the fixing plate (22), the first locking member (50) comprising a first plate body (51) and a cam (52), the first plate body (51) being movably arranged in the slide groove, the cam (52) being rotatably arranged in the slide groove, the first plate body (51) being located between the cam (52) and the first fastener (32), and the cam (52) being rotated so that the first plate body (51) avoids the first fastener (32) or the end of the first fastener (32) that stops the first fastener (32).

7. The vertebral prosthesis according to claim 5, characterized in that The vertebral prosthesis further includes a second locking member (60), the second locking member (60) including a second plate, the second plate being rotatably arranged on a side of the fixing plate (22) away from the vertebral filler (10), the second plate being arranged between two adjacent third mounting holes (221), and the second plate being rotated so as to avoid the second fastener (40) or stop the second fastener (40).

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