Cervical prosthesis

Abstract

The present invention provides a cervical vertebrae prosthesis, which includes: a solid layer, the solid layer including an anterior plate and a posterior plate that are interconnected, the anterior plate and the posterior plate together forming a receiving cavity, the anterior plate being an arc-shaped structure, the axis of the anterior plate extending in the vertical direction; a porous layer, the porous layer filling the receiving cavity; wherein the cervical vertebrae prosthesis has a first bone grafting hole that extends in the vertical direction and passes through the upper and lower end surfaces of the porous layer, and the cervical vertebrae prosthesis also has a second bone grafting hole that passes through the anterior plate and extends into the porous layer. The technical solution provided by this application can solve the problem in the related art that the cervical vertebrae prosthesis cannot increase the amount of bone grafting while meeting the structural strength.

Description

Technical Field

[0001] The present invention relates to the technical field of prostheses, and in particular to a cervical vertebra prosthesis. Background Art

[0002] Cervical spondylosis is one of the common diseases in humans. Anterior cervical vertebral subtotal vertebral resection and fusion is a commonly used surgical method for treating cervical spondylosis. This surgery implants a cervical prosthesis at the site of the diseased vertebra to achieve the purpose of reconstructing the cervical vertebrae segment.

[0003] In the related art, the cervical vertebra prosthesis is composed of a titanium cage and a cervical vertebra steel plate. Due to the design of the titanium cage and the cervical vertebra steel plate, the cervical vertebra prosthesis cannot increase the amount of bone graft while meeting the structural strength. Summary of the Invention

[0004] The present invention provides a cervical vertebra prosthesis to solve the problem in the related art that the cervical vertebra prosthesis cannot increase the amount of bone graft while meeting the structural strength requirement.

[0005] The present invention provides a cervical vertebra prosthesis, which includes: a solid layer, the solid layer includes a front side plate and a rear side plate that are connected to each other, the front side plate and the rear side plate together form an accommodating cavity, the front side plate is an arc-shaped structure, and the axis of the front side plate extends in the up-down direction; a porous layer, the porous layer fills the accommodating cavity; wherein, the cervical vertebra prosthesis has a first bone grafting hole, the first bone grafting hole extends in the up-down direction and passes through the upper end surface and the lower end surface of the porous layer, and the cervical vertebra prosthesis also has a second bone grafting hole, the second bone grafting hole passes through the front side plate and extends into the porous layer.

[0006] Furthermore, the second bone grafting hole is a strip-shaped hole extending in the up-down direction.

[0007] Furthermore, the side wall of the second bone grafting hole is an arc surface, and the middle portion of the second bone grafting hole is bent forward.

[0008] Furthermore, the distance between the upper end of the second bone grafting hole and the upper end of the front side plate and the distance between the lower end of the second bone grafting hole and the lower end of the front side plate are both A, where 2mm≤A≤4mm; and / or, the minimum distance between the first bone grafting hole and the second bone grafting hole is B, where 2mm≤B≤4mm.

[0009] Furthermore, the front side panel includes a plate body, four connecting sections and two transition sections connected in sequence from front to back. The two transition sections are respectively located on the left and right sides of the plate body. The upper and lower ends of the transition sections are respectively connected to the upper and lower ends of the plate body through the two connecting sections. The two transition sections are respectively connected to the left and right sides of the rear side panel. The plate body, the connecting sections and the transition sections together form a window, and the porous layer extends to the window.

[0010] Furthermore, a plurality of through holes are provided at the connection between the rear side plate and the transition section, and the plurality of through holes are spaced apart in the up-down direction.

[0011] Furthermore, the porous layer includes a trabecular structure, and the upper and lower end surfaces of the porous layer are both structures with a high middle and low sides. The upper end surface of the porous layer protrudes from the upper end surface of the solid layer, and the lower end surface of the porous layer protrudes from the lower end surface of the solid layer.

[0012] Furthermore, the upper end surface and the lower end surface of the porous layer both have a plurality of outwardly protruding protrusions; and / or the pore diameter of the trabecular structure is between 600 μm and 800 μm.

[0013] Furthermore, the cervical vertebra prosthesis has an observation hole, which passes through the front plate, the porous layer and the back plate from front to back; second bone grafting holes are provided on the left and right sides of the cervical vertebra prosthesis, and the observation hole is located between the two second bone grafting holes; observation holes are provided on the upper and lower ends of the cervical vertebra prosthesis.

[0014] Furthermore, the outer surface of the rear side plate is polished; and / or the cervical vertebrae prosthesis is manufactured by 3D printing.

[0015] According to the technical solution of the present invention, the cervical vertebra prosthesis includes a solid layer and a porous layer. The solid layer includes an anterior plate and a posterior plate connected to each other. The anterior plate and the posterior plate together form a receiving cavity, and the porous layer fills the receiving cavity. The cervical vertebra prosthesis has a first bone grafting hole and a second bone grafting hole. The first bone grafting hole extends in the up-down direction and passes through the upper end face and the lower end face of the porous layer. The second bone grafting hole passes through the anterior plate and extends into the porous layer. The cervical vertebra prosthesis adopting the above structure has enhanced structural strength compared to the titanium cage design because the cervical vertebra prosthesis includes a solid structure composed of anterior and posterior plates. In addition, the cervical vertebra prosthesis is provided with a first bone grafting hole and a second bone grafting hole. On the premise of enhancing the structural strength of the cervical vertebra prosthesis, the amount of bone grafting can be increased by using two bone grafting holes to simultaneously graft bones at different positions. 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 An axonometric view of a cervical vertebra prosthesis provided according to an embodiment of the present invention is shown;

[0018] Figure 2 A front view of a cervical vertebra prosthesis provided according to an embodiment of the present invention is shown;

[0019] Figure 3 A rear view of a cervical vertebra prosthesis according to an embodiment of the present invention is shown;

[0020] Figure 4 A side view of a cervical vertebra prosthesis provided according to an embodiment of the present invention is shown;

[0021] Figure 5 A top view of a cervical vertebra prosthesis according to an embodiment of the present invention is shown;

[0022] Figure 6 A side view of a cervical vertebra prosthesis provided according to an embodiment of the present invention after being implanted into a human body is shown;

[0023] Figure 7 Another side view of the cervical vertebrae prosthesis provided according to an embodiment of the present invention after being implanted into a human body is shown.

[0024] The above drawings include the following reference numerals:

[0025] 10. Physical layer; 11. Front side panel; 111. Arc structure; 112. Board body; 113. Connecting section; 114. Transition section; 12. Rear side panel; 13. Window; 14. Through hole;

[0026] 20. porous layer; 21. protrusion;

[0027] 30. First bone graft hole;

[0028] 40. Second bone graft hole; 41. Arc surface;

[0029] 50. Observation hole;

[0030] 60. Upper vertebral body; 61. Lower vertebral body; 62. Steel plate. DETAILED DESCRIPTION

[0031] 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.

[0032] like Figures 1 to 7As shown, an embodiment of the present invention provides a cervical vertebrae prosthesis, which includes a solid layer 10 and a porous layer 20. The solid layer 10 includes an interconnected front plate 11 and a rear plate 12. The front plate 11 and the rear plate 12 together form a receiving cavity. The front plate 11 is an arc-shaped structure 111, and the axis of the front plate 11 extends in the vertical direction. The porous layer 20 fills the receiving cavity. The cervical vertebrae prosthesis has a first bone graft hole 30, which extends in the vertical direction and passes through the upper and lower end surfaces of the porous layer 20. The cervical vertebrae prosthesis also has a second bone graft hole 40, which passes through the front plate 11 and extends into the porous layer 20.

[0033] According to the technical solution of the present invention, the cervical vertebrae prosthesis includes a solid layer 10 and a porous layer 20. The solid layer 10 includes an anterior plate 11 and a posterior plate 12 connected to each other. The anterior plate 11 and the posterior plate 12 together form a receiving cavity, and the porous layer 20 fills the receiving cavity. The cervical vertebrae prosthesis has a first bone grafting hole 30 and a second bone grafting hole 40. The first bone grafting hole 30 extends in the up-down direction and passes through the upper end face and the lower end face of the porous layer 20. The second bone grafting hole 40 passes through the anterior plate 11 and extends into the porous layer 20. The cervical vertebrae prosthesis adopting the above structure has enhanced structural strength compared to the titanium cage design because the cervical vertebrae prosthesis includes a solid structure composed of the anterior plate 11 and the posterior plate 12. In addition, the cervical vertebrae prosthesis is provided with the first bone grafting hole 30 and the second bone grafting hole 40. On the premise of enhancing the structural strength of the cervical vertebrae prosthesis, the use of the two bone grafting holes to simultaneously graft bones at different positions can increase the amount of bone grafting. Specifically, the solid structure composed of the front plate 11 and the rear plate 12 can ensure that after the cervical vertebrae prosthesis is implanted in the human body, sufficient compression stiffness is formed between the upper and lower vertebrae, thereby preventing the cervical vertebrae prosthesis from collapsing and enhancing axial stability.

[0034] It should be noted that the front side panel 11 is an arc-shaped structure 111, which means that the front side panel 11 is an arc-shaped panel, the two ends of the arc-shaped panel are bent toward the direction close to the rear side panel 12, the middle part of the arc-shaped panel is bent toward the direction away from the rear side panel 12, and the axis of the arc-shaped panel extends in the up and down directions.

[0035] In this embodiment, the rear side plate is a solid structure, which can prevent the bone graft from shifting toward the rear side of the human body after being implanted into the human body.

[0036] like Figure 2 and Figure 4 As shown, the second bone graft hole 40 is a strip hole extending in the vertical direction. The above structure is used to increase the volume of the bone graft and accelerate the fusion of the cervical vertebra prosthesis and the human skeleton.

[0037] The strip-shaped holes include strip-shaped holes whose side walls are vertical surfaces, and the strip-shaped holes also include strip-shaped holes whose side walls are curved surfaces.

[0038] like Figure 1As shown, the sidewall of the second bone graft hole 40 is a curved surface 41, and the middle portion of the second bone graft hole 40 is bent forward. With the above structure, the lateral bone graft space can be increased without affecting the strength of the cervical vertebra prosthesis.

[0039] In this embodiment, the curvature radius of the arc surface 41 is between 20 mm and 50 mm.

[0040] Specifically, the distance between the upper end of the second bone graft hole 40 and the upper end of the front side plate 11, and the distance between the lower end of the second bone graft hole 40 and the lower end of the front side plate 11 are both A, wherein 2mm≤A≤4mm. By setting the distance A between the upper end of the second bone graft hole 40 and the upper end of the front side plate 11, and the distance A between the lower end of the second bone graft hole 40 and the lower end of the front side plate 11 within the above-mentioned size range, the front side plate 11 can have a higher structural strength, and the volume of the bone graft can be not too small. If the distance A between the upper end of the second bone grafting hole 40 and the upper end of the front side plate 11 and the distance A between the lower end of the second bone grafting hole 40 and the lower end of the front side plate 11 are less than 2 mm, the structural strength of the front side plate 11 will be affected. If the distance A between the upper end of the second bone grafting hole 40 and the upper end of the front side plate 11 and the distance A between the lower end of the second bone grafting hole 40 and the lower end of the front side plate 11 are greater than 4 mm, the volume of the bone graft will be reduced, thereby affecting the fusion speed of the cervical vertebra prosthesis and the human skeleton.

[0041] Among them, the distance between the upper end of the second bone graft hole 40 and the upper end of the front side plate 11 and the distance A between the lower end of the second bone graft hole 40 and the lower end of the front side plate 11 can be 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm and any value between 2mm-4mm.

[0042] Furthermore, the minimum distance between the first bone graft hole 30 and the second bone graft hole 40 is B, where 2mm≤B≤4mm. The above-described dimensioning allows the bone grafts in the first bone graft hole 30 and the second bone graft hole 40 to penetrate and fuse through the porous layer 20, while also providing the porous layer 20 with a relatively high strength. If the minimum distance B between the first bone graft hole 30 and the second bone graft hole 40 is less than 2mm, the strength of the porous layer 20 will be affected. If the minimum distance B between the first bone graft hole 30 and the second bone graft hole 40 is greater than 4mm, the porous layer 20 will affect the speed at which the bone grafts in the first bone graft hole 30 and the second bone graft hole 40 form a through-fusion, thereby affecting the fusion speed between the cervical vertebrae prosthesis and the human skeleton.

[0043] The minimum distance B between the first bone graft hole 30 and the second bone graft hole 40 may be 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, or any value between 2 mm and 4 mm.

[0044] Specifically, the first bone grafting hole 30 is a circular hole, the aperture of the first bone grafting hole 30 is D, and the area of ​​the end surface of the cervical vertebra prosthesis is S1, wherein the ratio of D to S1 is between 0.2 and 0.4. The above ratio range is adopted to ensure that the first bone grafting hole 30 has sufficient bone grafting space and will not reduce the porous layer 20, thereby affecting the fusion speed of the cervical vertebra prosthesis and the human skeleton.

[0045] Specifically, the area of ​​the second bone grafting hole 40 is S2, and the area of ​​the front side plate 11 is S3, wherein the ratio of S2 to S3 is between 0.35 and 0.45. Using the above ratio range, the second bone grafting hole 40 will not affect the structural strength of the front side plate 11, and the second bone grafting hole 40 has sufficient bone grafting space.

[0046] In this embodiment, the diameter of the first bone graft hole 30 is between 2.5 mm and 4.5 mm, and the diameter of the second bone graft hole 40 is between 2 mm and 2.5 mm.

[0047] like Figure 1 As shown, the front plate 11 includes a plate body 112, four connecting sections 113, and two transition sections 114, which are connected in sequence from front to back. The two transition sections 114 are located on the left and right sides of the plate body 112, respectively. The upper and lower ends of the transition sections 114 are connected to the upper and lower ends of the plate body 112 through the two connecting sections 113, respectively. The two transition sections 114 are connected to the left and right sides of the rear plate 12, respectively. The plate body 112, the connecting sections 113, and the transition sections 114 together form a window 13, and the porous layer 20 extends into the window 13. By filling the window 13 with the porous layer 20, the bone grafts in the first bone graft hole 30 and the second bone graft hole 40 can be integrated with the human skeleton through the porous layer 20 in the window 13, thereby accelerating the integration of the cervical vertebrae prosthesis with the human skeleton and achieving long-term fixation of the cervical vertebrae prosthesis. In addition, the porous layer 20 in the window 13 can form blood supply for bone growth, promoting bone growth.

[0048] In this embodiment, the bone grafts in the first bone graft hole 30 and the second bone graft hole 40 can form a penetrating fusion of the bone graft through the porous layer 20 between the first bone graft hole 30 and the second bone graft hole 40, and can also form bony fusion with the human skeleton through the porous layer 20 in the window 13, thereby accelerating the fusion speed of the cervical vertebra prosthesis and the human skeleton, and realizing long-term fixation of the cervical vertebra prosthesis.

[0049] Specifically, the ratio of the area of ​​the window 13 to the area of ​​the front plate 11 is between 0.6 and 0.75. Adopting the above ratio range can substantially accelerate the fusion speed of the cervical vertebra prosthesis and the human skeleton.

[0050] like Figure 3As shown, a plurality of through holes 14 are provided at the connection between the rear side plate 12 and the transition section 114. The plurality of through holes 14 are spaced apart in the vertical direction. The through holes 14 can provide blood supply to the bone grafts in the first bone graft hole 30 and the second bone graft hole 40, thereby accelerating the bone fusion between the bone grafts and between the bone grafts and the human skeleton.

[0051] like Figure 2 As shown, the porous layer 20 comprises a trabecular structure, and both the upper and lower surfaces of the porous layer 20 are of a high-middle, low-side structure. The upper surface of the porous layer 20 protrudes from the upper surface of the solid layer 10, and the lower surface of the porous layer 20 protrudes from the lower surface of the solid layer 10. This structure facilitates a good fit between the cervical prosthesis and the upper and lower vertebral bodies after implantation.

[0052] In this embodiment, the upper end surface of the porous layer 20 protrudes from the upper end surface of the solid layer 10 , and the lower end surface of the porous layer 20 protrudes from the lower end surface of the solid layer 10 . The protruding portion is designed with various angles and diameters for selection.

[0053] like Figure 1 As shown, the upper and lower end surfaces of the porous layer 20 have multiple outwardly protruding protrusions 21. The cervical prosthesis contacts the upper and lower vertebral bodies through the protrusions 21, which facilitates positioning of the cervical prosthesis and achieves fixation of the cervical prosthesis.

[0054] Specifically, the pore diameter of the trabecular structure is between 600 μm and 800 μm. Setting the pore diameter of the trabecular structure within this size range not only enables good blood flow within the trabecular structure, but also promotes bone tissue growth. If the pore diameter of the trabecular structure is less than 600 μm, it is not conducive to good blood flow within the trabecular structure. If the pore diameter of the trabecular structure is greater than 800 μm, it is not conducive to bone tissue growth.

[0055] The pore diameter of the trabecular structure may be 600 μm, 620 μm, 640 μm, 660 μm, 680 μm, 700 μm, 720 μm, 740 μm, 760 μm, 780 μm, 800 μm, or any value between 600 μm and 800 μm.

[0056] like Figure 1 As shown, the cervical vertebra prosthesis has an observation hole 50, which passes through the front plate 11, the porous layer 20 and the back plate 12 from front to back. The observation hole 50 is convenient for observing the growth of bone tissue, and drugs or growth factors can also be implanted in the observation hole 50, which has the advantage of multiple uses.

[0057] In this embodiment, second bone grafting holes 40 are provided on both the left and right sides of the cervical vertebra prosthesis, and the observation hole 50 is located between the two second bone grafting holes 40. By providing second bone grafting holes 40 on both the left and right sides of the cervical vertebra prosthesis, the amount of bone grafting can be further increased, thereby accelerating the bone fusion speed of the cervical vertebra prosthesis and realizing long-term fixation of the cervical vertebra prosthesis.

[0058] Specifically, both the upper and lower ends of the cervical vertebra prosthesis are provided with observation holes 50. The above arrangement facilitates observation of the growth of bone tissue from multiple angles and further understanding of the patient's recovery.

[0059] The outer surface of the posterior plate 12 is polished to prevent soft tissue from adhering to the posterior plate 12 , thereby reducing the risk of secondary spinal cord compression.

[0060] Furthermore, in this embodiment, the rear side plate 12 is an arc-shaped plate, and the radius of the arc-shaped plate is between 30 mm and 50 mm.

[0061] In this embodiment, the cervical vertebra prosthesis is made by 3D printing, which has the advantage of being easy to process. The cervical vertebra prosthesis is made of medical metals, including but not limited to titanium and titanium alloys, cobalt alloys, stainless steel, tantalum metal, and magnesium alloys.

[0062] It should be noted that, in this embodiment, Figure 6 and Figure 7 As shown, the front and back directions correspond to the front and back sides of the human body, and the top and bottom directions correspond to the upper vertebral body 60 and the lower vertebral body 61. After the cervical vertebra prosthesis is installed, the front side of the cervical vertebra prosthesis is shielded by an auxiliary steel plate 62.

[0063] The cervical vertebra prosthesis provided by the present invention has the following beneficial effects:

[0064] 1) Because the cervical vertebrae prosthesis includes a solid structure consisting of the front plate 11 and the back plate 12, the structural strength is enhanced compared to a titanium cage design. In addition, the cervical vertebrae prosthesis is provided with a first bone grafting hole 30 and a second bone grafting hole 40. While enhancing the structural strength of the cervical vertebrae prosthesis, simultaneous bone grafting at different locations using the two bone grafting holes can increase the amount of bone grafted.

[0065] 2) The solid structure composed of the front plate 11 and the rear plate 12 can ensure that after the cervical vertebrae prosthesis is implanted in the human body, sufficient compression stiffness is formed between the upper and lower vertebrae, thereby preventing the cervical vertebrae prosthesis from collapsing and enhancing axial stability;

[0066] 3) The bone grafts in the first bone graft hole 30 and the second bone graft hole 40 can not only form a through-fusion of the bone grafts through the porous layer 20 between the first bone graft hole 30 and the second bone graft hole 40, but can also form bony fusion with the human skeleton through the porous layer 20 in the window 13, thereby accelerating the fusion speed of the cervical vertebrae prosthesis and the human skeleton, and achieving long-term fixation of the cervical vertebrae prosthesis;

[0067] 4) The upper and lower end surfaces of the porous layer 20 are both high in the middle and low on both sides. The upper end surface of the porous layer 20 protrudes from the upper end surface of the solid layer 10, and the lower end surface of the porous layer 20 protrudes from the lower end surface of the solid layer 10. This is conducive to forming a good fit between the cervical prosthesis and the upper and lower vertebral bodies after implantation;

[0068] 5) The cervical vertebra prosthesis contacts the upper and lower vertebral bodies through the protrusions 21, which facilitates positioning of the cervical vertebra prosthesis and achieves fixation of the cervical vertebra prosthesis.

[0069] 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.

[0070] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and 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 accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0071] 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.

[0072] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", 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 include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0073] 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.

[0074] 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 cervical vertebra prosthesis, characterized in that: The cervical vertebra prosthesis comprises: A physical layer (10), the physical layer (10) comprising a front side plate (11) and a rear side plate (12) connected to each other, the front side plate (11) and the rear side plate (12) jointly forming a receiving cavity, the front side plate (11) being an arc-shaped structure (111), and the axis of the front side plate (11) extending in an up-down direction; A porous layer (20), the porous layer (20) filling the accommodating cavity; The cervical vertebra prosthesis has a first bone graft hole (30), which extends in the up-down direction and passes through the upper end surface and the lower end surface of the porous layer (20); the cervical vertebra prosthesis also has a second bone graft hole (40), which passes through the front plate (11) and extends into the porous layer (20); The first bone graft hole (30) is a circular hole, the aperture of the first bone graft hole (30) is D, the area of ​​the end surface of the cervical vertebra prosthesis is S1, wherein the ratio of D to S1 is between 0.2 and 0.4, the area of ​​the second bone graft hole (40) is S2, and the area of ​​the front plate (11) is S3, wherein the ratio of S2 to S3 is between 0.35 and 0.45; The front side plate (11) comprises a plate body (112), four connecting sections (113) and two transition sections (114) connected in sequence from front to back, the two transition sections (114) are respectively located on the left and right sides of the plate body (112), the upper end and the lower end of the transition section (114) are respectively connected to the upper end and the lower end of the plate body (112) through the two connecting sections (113), the two transition sections (114) are respectively connected to the left and right sides of the rear side plate (12), the plate body (112), the connecting sections (113) and the transition sections (114) together form a window (13), the porous layer (20) extends to the window (13), and the area ratio of the window (13) to the area of ​​the front side plate (11) is between 0.6 and 0.75; The second bone grafting hole (40) is provided on both the left and right sides of the cervical vertebra prosthesis.

2. The cervical vertebra prosthesis according to claim 1, characterized in that: The second bone grafting hole (40) is a strip-shaped hole extending in the up-down direction.

3. The cervical vertebra prosthesis according to claim 2, characterized in that: The side wall of the second bone grafting hole (40) is a curved surface (41), and the middle portion of the second bone grafting hole (40) is bent forward.

4. The cervical vertebra prosthesis according to claim 2, characterized in that: The distance between the upper end of the second bone graft hole (40) and the upper end of the front plate (11) and the distance between the lower end of the second bone graft hole (40) and the lower end of the front plate (11) are both A, wherein 2mm≤A≤4mm; and / or, The minimum distance between the first bone grafting hole (30) and the second bone grafting hole (40) is B, wherein 2mm≤B≤4mm.

5. The cervical vertebra prosthesis according to claim 1, characterized in that: A plurality of through holes (14) are provided at the connection between the rear side plate (12) and the transition section (114), and the plurality of through holes (14) are spaced apart in the up-down direction.

6. The cervical vertebra prosthesis according to claim 1, characterized in that: The porous layer (20) includes a trabecular structure, and the upper end surface and the lower end surface of the porous layer (20) are both structures with a high middle and low sides. The upper end surface of the porous layer (20) protrudes from the upper end surface of the solid layer (10), and the lower end surface of the porous layer (20) protrudes from the lower end surface of the solid layer (10).

7. The cervical vertebra prosthesis according to claim 6, characterized in that: The upper end surface and the lower end surface of the porous layer (20) both have a plurality of protrusions (21) protruding outward; and / or, The pore diameter of the trabecular structure is between 600 μm and 800 μm.

8. The cervical vertebra prosthesis according to claim 1, characterized in that: The cervical vertebra prosthesis has an observation hole (50), and the observation hole (50) sequentially passes through the front plate (11), the porous layer (20), and the rear plate (12) from front to back; The observation hole (50) is located between the two second bone graft holes (40); The upper end and the lower end of the cervical vertebra prosthesis are both provided with the observation hole (50).

9. The cervical vertebra prosthesis according to claim 1, characterized in that: The outer surface of the rear side plate (12) is polished; and / or, The cervical vertebra prosthesis is made by 3D printing.

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