CN216495886U - Cervical prosthesis - Google Patents

Abstract

The utility model provides a cervical prosthesis, which comprises: the solid layer comprises a front side plate and a rear side plate which are connected with each other, the front side plate and the rear side plate jointly enclose an accommodating cavity, the front side plate is of an arc-shaped structure, and the axis of the front side plate extends along the vertical direction; the porous layer is filled in the accommodating cavity; the cervical vertebra prosthesis is provided with a first bone grafting hole, the first bone grafting hole extends along the up-down direction and penetrates through the upper end face and the lower end face of the porous layer, the cervical vertebra prosthesis is further provided with a second bone grafting hole, and the second bone grafting hole penetrates through the front side plate and extends into the porous layer. Through the technical scheme that this application provided, can solve the problem that the cervical vertebra false body among the correlation technique can't increase the bone grafting bone volume under the prerequisite that satisfies structural strength.

Description

Cervical prosthesis

Technical Field

The utility model relates to the technical field of prostheses, in particular to a cervical vertebra prosthesis.

Background

Cervical spondylosis is one of common diseases of human beings, and the cervical vertebra partial total resection fusion is a common operation method for treating cervical spondylosis by implanting a cervical vertebra prosthesis at a diseased vertebral body part, so as to achieve the purpose of reconstructing a cervical vertebra segment.

In the related art, the cervical prosthesis is composed of a titanium cage and a cervical spine steel plate, and due to the design reasons of the titanium cage and the cervical spine steel plate, the bone grafting amount of the cervical prosthesis cannot be increased on the premise of meeting the structural strength.

SUMMERY OF THE UTILITY MODEL

The utility model provides a cervical vertebra prosthesis, which aims to solve the problem that the bone grafting amount of the cervical vertebra prosthesis in the related technology cannot be increased on the premise of meeting the structural strength.

The present invention provides a cervical prosthesis, which comprises: the solid layer comprises a front side plate and a rear side plate which are connected with each other, the front side plate and the rear side plate jointly enclose an accommodating cavity, the front side plate is of an arc-shaped structure, and the axis of the front side plate extends along the vertical direction; the porous layer is filled in the accommodating cavity; the cervical vertebra prosthesis is provided with a first bone grafting hole, the first bone grafting hole extends along the up-down direction and penetrates through the upper end face and the lower end face of the porous layer, the cervical vertebra prosthesis is further provided with a second bone grafting hole, and the second bone grafting hole penetrates through the front side plate and extends into the porous layer.

Furthermore, the second bone grafting holes are strip-shaped holes extending along the up-down direction.

Furthermore, the side wall of the second bone grafting hole is an arc surface, and the middle part of the second bone grafting hole is bent forwards.

Further, 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, wherein A is more than or equal to 2mm and less than or equal to 4 mm; and/or the minimum distance between the first bone grafting hole and the second bone grafting hole is B, wherein B is more than or equal to 2mm and less than or equal to 4 mm.

Further, preceding curb plate includes by preceding plate body, four linkage segments and two changeover portions that connect gradually after to, and two changeover portions are located the left side and the right side of plate body respectively, and the upper end and the lower extreme of changeover portion are connected with plate body upper end and lower extreme through two linkage segments respectively, and two changeover portions are connected with the left side and the right side of posterior lateral plate respectively, and plate body, linkage segment and changeover portion enclose into the window jointly, and the porous layer extends to the window.

Furthermore, a plurality of through holes are formed in the connecting position of the rear side plate and the transition section, and are arranged at intervals in the vertical direction.

Further, the porous layer comprises a trabecular bone structure, the upper end face and the lower end face of the porous layer are both high in the middle and low in the two sides, the upper end face of the porous layer protrudes out of the upper end face of the solid layer, and the lower end face of the porous layer protrudes out of the lower end face of the solid layer.

Further, both the upper end surface and the lower end surface of the porous layer are provided with a plurality of protrusions protruding outwards; and/or the pore diameter of the bone trabecular structure is between 600 μm and 800 μm.

Furthermore, the cervical vertebra prosthesis is provided with an observation hole, and the observation hole sequentially penetrates through the front side plate, the porous layer and the rear side plate from front to back; the left side and the right side of the cervical vertebra prosthesis are provided with second bone grafting holes, and the observation hole is positioned between the two second bone grafting holes; the upper end and the lower end of the cervical vertebra prosthesis are both provided with observation holes.

Further, the outer surface of the rear side plate is polished; and/or the cervical vertebra prosthesis is made by 3D printing.

By applying the technical scheme of the utility model, the cervical vertebra prosthesis comprises a solid layer and a porous layer, the solid layer comprises an anterior side plate and a posterior side plate which are mutually connected, the anterior side plate and the posterior side plate jointly enclose an accommodating cavity, and the accommodating cavity is filled with the porous layer. The cervical vertebra prosthesis is provided with a first bone grafting hole and a second bone grafting hole, the first bone grafting hole extends along the up-down direction and penetrates through the upper end surface and the lower end surface of the porous layer, and the second bone grafting hole penetrates through the front side plate and extends into the porous layer. Adopt the cervical vertebra false body of above-mentioned structure, because the cervical vertebra false body includes the entity structure that preceding curb plate and posterior lateral plate are constituteed, compare in the design of titanium cage, strengthened structural strength to the cervical vertebra false body is provided with first bone grafting hole and second bone grafting hole, under the prerequisite that has strengthened the structural strength of cervical vertebra false body, utilizes two bone grafting holes to plant the bone simultaneously in different positions and can increase the bone volume of planting the bone.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

fig. 1 illustrates an isometric view of a cervical spine prosthesis provided in accordance with an embodiment of the present invention;

fig. 2 illustrates an anterior view of a cervical prosthesis provided in accordance with an embodiment of the present invention;

fig. 3 illustrates a rear view of a cervical prosthesis provided according to an embodiment of the present invention;

FIG. 4 illustrates a side view of a cervical prosthesis provided in accordance with an embodiment of the present invention;

FIG. 5 illustrates a top view of a cervical prosthesis provided in accordance with an embodiment of the present invention;

FIG. 6 illustrates a side view of a cervical spine prosthesis provided in accordance with an embodiment of the present invention after being implanted in a human body;

fig. 7 illustrates a further side view of the cervical spine prosthesis provided in accordance with an embodiment of the present invention after being implanted in a human body.

Wherein the figures include the following reference numerals:

10. a physical layer; 11. a front side plate; 111. an arc-shaped structure; 112. a plate body; 113. a connecting section; 114. a transition section; 12. a rear side plate; 13. a window; 14. a through hole;

20. a porous layer; 21. a protrusion;

30. a first bone grafting hole;

40. a second bone grafting hole; 41. a cambered surface;

50. an observation hole;

60. a superior vertebral body; 61. the inferior vertebral body; 62. and (3) a steel plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 7, an embodiment of the present invention provides a cervical prosthesis, which includes a solid layer 10 and a porous layer 20, wherein the solid layer 10 includes an anterior lateral plate 11 and a posterior lateral plate 12 connected to each other, the anterior lateral plate 11 and the posterior lateral plate 12 together enclose a receiving cavity, the anterior lateral plate 11 is an arc-shaped structure 111, an axis of the anterior lateral plate 11 extends in an up-down direction, and the receiving cavity is filled with the porous layer 20. Wherein, the cervical vertebra prosthesis has a first bone grafting hole 30, the first bone grafting hole 30 extends along the up and down direction and penetrates the upper end surface and the lower end surface of the porous layer 20, the cervical vertebra prosthesis also has a second bone grafting hole 40, the second bone grafting hole 40 penetrates the anterior lateral plate 11 and extends into the porous layer 20.

By applying the technical scheme of the utility model, the cervical vertebra prosthesis comprises a solid layer 10 and a porous layer 20, wherein the solid layer 10 comprises an anterior side plate 11 and a posterior side plate 12 which are connected with each other, the anterior side plate 11 and the posterior side plate 12 jointly enclose an accommodating cavity, and the accommodating cavity is filled with the porous layer 20. The cervical prosthesis has first bone grafting holes 30 and second bone grafting holes 40, the first bone grafting holes 30 extend in the up-down direction and penetrate the upper end surface and the lower end surface of the porous layer 20, and the second bone grafting holes 40 penetrate the anterior lateral plate 11 and extend into the porous layer 20. Adopt the cervical vertebra false body of above-mentioned structure, because the cervical vertebra false body includes the entity structure that anterior lateral plate 11 and posterior lateral plate 12 are constituteed, compare in the design of titanium cage, strengthened structural strength to the cervical vertebra false body is provided with first bone grafting hole 30 and second bone grafting hole 40, under the prerequisite that has strengthened the structural strength of cervical vertebra false body, utilizes two bone grafting holes to plant the bone simultaneously in different positions and can increase the bone volume of planting the bone. Specifically, the solid structure formed by the front side plate 11 and the rear side plate 12 can ensure that after the cervical vertebra prosthesis is implanted into a human body, sufficient compression rigidity is formed between the upper vertebral body and the lower vertebral body, the cervical vertebra prosthesis is prevented from collapsing, and the axial stability is enhanced.

It should be noted that, the front side plate 11 is an arc-shaped structure 111, that is, the front side plate 11 is an arc-shaped plate, two ends of the arc-shaped plate are bent toward a direction close to the rear side plate 12, a middle of the arc-shaped plate is bent toward a direction far away from the rear side plate 12, and an axis of the arc-shaped plate extends in an up-down direction.

In this embodiment, the posterior lateral plate is a solid structure, which can prevent the bone graft from moving to the posterior side of the human body after the bone graft is implanted into the human body.

As shown in fig. 2 and 4, the second bone graft holes 40 are strip-shaped holes extending in the up-down direction. By adopting the structure, the volume of bone grafting is convenient to increase, and the fusion of the cervical vertebra prosthesis and human skeleton can be accelerated.

Wherein, the bar hole includes that the lateral wall in hole is the bar hole of vertical face, and the bar hole still includes that the lateral wall in hole is the bar hole of curved surface.

As shown in fig. 1, the lateral wall of the second bone grafting hole 40 is a cambered surface 41, and the middle of the second bone grafting hole 40 is bent forward. By adopting the structure, the lateral bone grafting space can be increased while the strength of the cervical vertebra prosthesis is not influenced.

In the present embodiment, the radius of curvature of the arc surface 41 is between 20mm and 50 mm.

Specifically, the distance between the upper end of the second bone grafting hole 40 and the upper end of the front side plate 11 and the distance between the lower end of the second bone grafting hole 40 and the lower end of the front side plate 11 are both a, wherein a is greater than or equal to 2mm and less than or equal to 4mm, and 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 set within the above size range, so that the front side plate 11 has high structural strength, and the bone grafting volume is 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 2mm, the structural strength of the front side plate 11 is affected, and 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 4mm, the volume of the bone graft is reduced, and the fusion speed of the cervical prosthesis and the human bone is affected.

The distance a between the upper end of the second bone grafting hole 40 and the upper end of the anterior plate 11 and the distance a between the lower end of the second bone grafting hole 40 and the lower end of the anterior plate 11 may be any value between 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, and 2mm-4 mm.

And the minimum distance between the first bone grafting hole 30 and the second bone grafting hole 40 is B, wherein B is more than or equal to 2mm and less than or equal to 4 mm. With the above-described sizing, it is possible to cause the bone graft in the first bone graft hole 30 and the second bone graft hole 40 to form the through fusion of the bone graft through the porous layer 20, and to provide the porous layer 20 with high strength. If the minimum distance B between the first bone grafting holes 30 and the second bone grafting holes 40 is less than 2mm, the strength of the porous layer 20 is affected, and if the minimum distance B between the first bone grafting holes 30 and the second bone grafting holes 40 is greater than 4mm, the porous layer 20 affects the speed of the bone grafting formation through fusion in the first bone grafting holes 30 and the second bone grafting holes 40, and thus the speed of the fusion of the cervical spine prosthesis and the human bone.

Wherein the minimum distance B between the first bone grafting hole 30 and the second bone grafting hole 40 may be any value between 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm and 2mm-4 mm.

Specifically, the first bone grafting holes 30 are circular holes, the diameter of each 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, and by adopting the ratio range, the first bone grafting holes 30 have sufficient bone grafting space, and the porous layer 20 cannot be reduced, so that the fusion speed of the cervical vertebra prosthesis and the human skeleton is influenced.

Specifically, the area of the second bone grafting hole 40 is S2, the area of the anterior plate 11 is S3, wherein the ratio of S2 to S3 is 0.35 to 0.45, with the above ratio range, the second bone grafting hole 40 does not affect the structural strength of the anterior plate 11, and the second bone grafting hole 40 has a sufficient bone grafting space.

In the present embodiment, the first bone grafting holes 30 have a hole diameter of 2.5mm to 4.5mm, and the second bone grafting holes 40 have a hole diameter of 2mm to 2.5 mm.

As shown in fig. 1, the front side plate 11 includes a plate body 112, four connecting sections 113 and two transition sections 114 sequentially connected from front to back, the two transition sections 114 are respectively located at the left side and the right side of the plate body 112, the upper end and the lower end of the transition section 114 are respectively connected with 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 with the left side and the right side of the rear side plate 12, the plate body 112, the connecting sections 113 and the transition sections 114 jointly enclose a window 13, and the porous layer 20 extends to the window 13. By filling the porous layer 20 in the window 13, the bone graft in the first bone grafting hole 30 and the second bone grafting hole 40 can be fused with the human skeleton through the porous layer 20 in the window 13, so that the fusion speed of the cervical vertebra prosthesis and the human skeleton is accelerated, and the long-term fixation of the cervical vertebra prosthesis is realized. Also, blood circulation for bone growth can be formed through the porous layer 20 in the window 13, promoting bone growth.

In this embodiment, the bone grafts in the first bone grafting holes 30 and the second bone grafting holes 40 can form penetration fusion of the bone grafts through the porous layer 20 between the first bone grafting holes 30 and the second bone grafting holes 40, and can also form osseous fusion with the human skeleton through the porous layer 20 in the window 13, so as to accelerate the fusion speed of the cervical vertebra prosthesis and the human skeleton, and realize the long-term fixation of the cervical vertebra prosthesis.

Specifically, the ratio of the area of the window 13 to the area of the front side plate 11 is between 0.6 and 0.75. By adopting the proportion range, the fusion speed of the cervical vertebra prosthesis and the human skeleton can be fully accelerated.

As shown in fig. 3, 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 in the vertical direction. The through hole 14 can provide blood for the bone graft in the first bone graft hole 30 and the second bone graft hole 40, and the osseous fusion between the bone graft and the human skeleton is accelerated.

As shown in fig. 2, the porous layer 20 has a trabecular bone structure, and both the upper end surface and the lower end surface of the porous layer 20 have a structure with a high middle and two low sides, the upper end surface of the porous layer 20 protruding beyond the upper end surface of the solid layer 10, and the lower end surface of the porous layer 20 protruding beyond the lower end surface of the solid layer 10. By adopting the structure, the cervical vertebra prosthesis is favorable for forming good adaptability with the upper vertebral body and the lower vertebral body after being implanted into a human body.

In this embodiment, the upper end surface of the porous layer 20 protrudes from the upper end surface of the solid layer 10, the lower end surface of the porous layer 20 protrudes from the lower end surface of the solid layer 10, and the protruding portion is designed with various angles and diameters to provide options.

As shown in fig. 1, the upper end surface and the lower end surface of the porous layer 20 are provided with a plurality of bulges 21 protruding outwards, and the cervical vertebra prosthesis is contacted with the upper vertebral body and the lower vertebral body through the bulges 21, so that the cervical vertebra prosthesis is positioned conveniently and fixed.

In particular, the pore diameter of the trabecular bone structure is between 600 μm and 800 μm. The pore diameter of the bone trabecular structure is set in the size range, so that good blood circulation can be formed in the bone trabecular structure, and the growth of bone tissues is facilitated. If the pore diameter of the trabecular bone structure is less than 600 μm, good blood circulation is not facilitated in the trabecular bone structure, and if the pore diameter of the trabecular bone structure is greater than 800 μm, growth of bone tissue is not facilitated.

Wherein the pore diameter of the trabecular bone structure may be any value between 600 μm, 620 μm, 640 μm, 660 μm, 680 μm, 700 μm, 720 μm, 740 μm, 760 μm, 780 μm, 800 μm and 600 μm to 800 μm.

As shown in fig. 1, the cervical prosthesis has an observation hole 50, the observation hole 50 sequentially penetrates through the anterior plate 11, the porous layer 20 and the posterior plate 12 from front to back, the growth of bone tissue can be observed conveniently through the observation hole 50, and a drug or a growth factor can be implanted into the observation hole 50, so that the cervical prosthesis has the advantage of multiple purposes.

In this embodiment, the left side and the right side of cervical vertebra prosthesis all are provided with the second and plant bone hole 40, and observation hole 50 is located between two second and plants bone hole 40, all sets up second through left side and the right side at cervical vertebra prosthesis and plants bone hole 40, can further increase the bone volume of bone grafting, and then accelerates cervical vertebra prosthesis's bone fusion speed, realizes that cervical vertebra prosthesis's long term is fixed.

Specifically, the upper and lower ends of the cervical prosthesis are provided with viewing holes 50. Adopt above-mentioned setting, the growth condition of the observation bone tissue of the multi-angle of being convenient for further knows patient's recovery condition.

Wherein, the outer surface of posterior lateral plate 12 adopts polishing treatment, prevents soft tissue and posterior lateral plate 12 adhesion, and then reduces the risk that the secondary spinal cord is pressed.

Also, in the present embodiment, the rear side plate 12 is an arc-shaped plate having a radius of 30mm to 50 mm.

In this embodiment, the cervical vertebra prosthesis is made by 3D printing, which has the advantage of easy processing. The cervical prosthesis is made of medical metal, including but not limited to titanium and titanium alloy, cobalt alloy, stainless steel, tantalum metal and magnesium alloy.

In this embodiment, as shown in fig. 6 and 7, the anteroposterior direction corresponds to the anterior and posterior sides of the human body, the superior and inferior directions correspond to the superior vertebral body 60 and the inferior vertebral body 61, and the anterior side of the cervical prosthesis is shielded by the auxiliary steel plate 62 after the cervical prosthesis is installed.

The cervical vertebra prosthesis provided by the utility model has the following beneficial effects:

1) because the cervical vertebra prosthesis comprises a solid structure consisting of the front side plate 11 and the rear side plate 12, compared with the design of a titanium cage, the structural strength is enhanced, and the cervical vertebra 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 vertebra prosthesis, the bone grafting amount of bone grafting can be increased by simultaneously grafting bones at different positions by utilizing the two bone grafting holes;

2) the solid structure formed by the front side plate 11 and the rear side plate 12 can ensure that after the cervical vertebra prosthesis is implanted into a human body, enough compression rigidity is formed between the upper vertebral body and the lower vertebral body, the cervical vertebra prosthesis is prevented from collapsing, and the axial stability is enhanced;

3) the bone grafting in the first bone grafting hole 30 and the second bone grafting hole 40 can form bone grafting penetration fusion through the porous layer 20 between the first bone grafting hole 30 and the second bone grafting hole 40, and can also form bone fusion with the human skeleton through the porous layer 20 in the window 13, so that the fusion speed of the cervical vertebra prosthesis and the human skeleton is accelerated, and the long-term fixation of the cervical vertebra prosthesis is realized;

4) the upper end surface and the lower end surface of the porous layer 20 are both structures with a high middle part and two low sides, the upper end surface of the porous layer 20 protrudes out of the upper end surface of the solid layer 10, and the lower end surface of the porous layer 20 protrudes out of the lower end surface of the solid layer 10, so that good adaptability is formed between the upper vertebral body and the lower vertebral body after the cervical vertebra prosthesis is implanted into a human body;

5) the cervical vertebra prosthesis is contacted with the upper and lower centrum through the bulge 21, which is convenient for positioning the cervical vertebra prosthesis and realizes the fixation of the cervical vertebra prosthesis.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … … surface," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the 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 a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and unless otherwise stated, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A cervical prosthesis, comprising:

the solid layer (10) comprises a front side plate (11) and a rear side plate (12) which are connected with each other, the front side plate (11) and the rear side plate (12) jointly enclose an accommodating cavity, the front side plate (11) is of an arc-shaped structure (111), and the axis of the front side plate (11) extends in the vertical direction;

a porous layer (20), wherein the porous layer (20) is filled in the accommodating cavity;

wherein the cervical vertebra prosthesis is provided with a first bone grafting hole (30), the first bone grafting hole (30) extends along the up-down direction and penetrates through the upper end surface and the lower end surface of the porous layer (20), the cervical vertebra prosthesis is further provided with a second bone grafting hole (40), and the second bone grafting hole (40) penetrates through the front side plate (11) and extends into the porous layer (20).

2. Cervical prosthesis according to claim 1, characterized in that the second bone grafting holes (40) are strip-shaped holes extending in the up-down direction.

3. Cervical prosthesis according to claim 2, characterized in that the lateral walls of the second bone grafting holes (40) are cambered surfaces (41), the middle of the second bone grafting holes (40) being curved forward.

4. The cervical prosthesis of claim 2,

the distance between the upper end of the second bone grafting hole (40) and the upper end of the front side plate (11) and the distance between the lower end of the second bone grafting hole (40) and the lower end of the front side plate (11) are both A, wherein A is more than or equal to 2mm and less than or equal to 4 mm; and/or the presence of a gas in the gas,

the minimum distance between the first bone grafting hole (30) and the second bone grafting hole (40) is B, wherein B is more than or equal to 2mm and less than or equal to 4 mm.

5. The cervical prosthesis according to claim 1, wherein the anterior plate (11) comprises a plate body (112), four connecting sections (113) and two transition sections (114), which are sequentially connected from front to back, the two transition sections (114) are respectively located at the left side and the right side of the plate body (112), the upper end and the lower end of the transition section (114) are respectively connected with 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 with the left side and the right side of the posterior plate (12), the plate body (112), the connecting sections (113) and the transition sections (114) jointly enclose a window (13), and the porous layer (20) extends to the window (13).

6. The cervical prosthesis according to claim 5, wherein a plurality of through holes (14) are formed at the connection of the posterior plate (12) and the transition section (114), and the plurality of through holes (14) are arranged at intervals in the up-down direction.

7. Cervical prosthesis according to claim 1, characterized in that the porous layer (20) comprises a trabecular bone structure, the upper and lower end faces of the porous layer (20) are both of a structure with a high middle and two low sides, the upper end face of the porous layer (20) protrudes the upper end face of the solid layer (10), and the lower end face of the porous layer (20) protrudes the lower end face of the solid layer (10).

8. The cervical prosthesis of claim 7,

the upper end face and the lower end face of the porous layer (20) are provided with a plurality of bulges (21) protruding outwards; and/or the presence of a gas in the gas,

the pore diameter of the bone trabecular structure is between 600 and 800 μm.

9. The cervical prosthesis of claim 1,

the cervical vertebra prosthesis is provided with an observation hole (50), and the observation hole (50) sequentially penetrates through the front side plate (11), the porous layer (20) and the rear side plate (12) from front to back;

the left side and the right side of the cervical vertebra prosthesis are provided with the second bone grafting holes (40), and the observation hole (50) is positioned between the two second bone grafting holes (40);

the upper end and the lower end of the cervical vertebra prosthesis are both provided with the observation holes (50).

10. The cervical prosthesis of claim 1,

the outer surface of the rear side plate (12) is subjected to polishing treatment; and/or the presence of a gas in the gas,

the cervical vertebra prosthesis is made by 3D printing.

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