GB2612444A

GB2612444A - Two-segment bionic cervical intervertebral disc system for connecting to a vertebral body

Info

Publication number: GB2612444A
Application number: GB2214300.2A
Authority: GB
Inventors: Hao Dingjun; Zhang Haiping; Liu Lin
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-07-12
Filing date: 2022-09-29
Publication date: 2023-05-03
Anticipated expiration: 2042-09-29
Also published as: CN115192271A; GB202214300D0; GB2612444B

Abstract

The present invention discloses a two-segment bionic cervical intervertebral disc system, for connecting to a vertebral body, comprising; an upper end plate 11, a cup-shaped artificial intervertebral disc 12, and a lower end 14 plate which are sequentially connected. The upper end plate 11 has a first curved surface structure matched with an upper vertebral body, the lower end plate 14 has a second curved surface structure matched with a lower vertebral body, and the first curved surface structure and the second curved surface structure are both porous layers. The upper and lower end plates 11, 14 and the artificial intervertebral disc 12 are connected by respective first and second movable bionic parts. Bolts 13 used for fixation with the vertebral bodies on two sides are arranged on the artificial intervertebral disc 12. The cup-shaped structure 12 has porous surfaces on two sides and polished surfaces on the front and rear sides. The system can reduce the fusion of two segments, preserve the movement function of cervical vertebrae, and effectively treat cervical vertebra diseases.

Description

TWO-SEGMENT BIONIC CERVICAL INTERVERTEBRAL DISC SYSTEM FOR CONNECTING TO A VERTEBRAL BODY

FIELD OF THE PRESENT DISCLOSURE

[0001] The present invention relates to the technical field of orthopaedic surgeries, in particular to a two-segment bionic cervical intervertebral disc system for connecting to a vertebral body

BACKGROUND OF THE PRESENT DISCLOSURE

[0002] In recent years, with the rapid development of science, technology and economy, most of the elderly and young people are in a state where they cannot leave their mobile phones, and even primary and secondary school students carry on online learning. Longterm use of computers and mobile phones has accelerated the development of cervical vertebra degenerative diseases, and the number of cervical vertebra surgeries has increased. Anterior cervical corpectomy and fusion (ACCF) is a main treatment method for treating cervical vertebra diseases and improving clinical symptoms in the past in the clinic, and fusion has been regarded as the "gold standard" for many years. With the extension of follow-up time, the occurrence of ASD becomes more and more prominent, which requires reoperation and results in fewer and fewer movable segments of the cervical vertebra; and the stiffness of a neck will accompany the patient's life, and seriously affects the quality of life of patients for the rest of their lives. How to reduce the fusion of two segments and preserve the movement function of cervical vertebra has far-reaching influence and significance for the treatment of cervical vertebra diseases. [0003] Previous scholars have also made preliminary attempts. Chinese patent CN201110179966.2 discloses an adjustable artificial cervical vertebra and intervertebral connection assembly which comprises a vertebral body part and two end plate parts connected to an upper end and a lower end of the vertebral body part through ball joint structures respectively. The vertebral body part comprises an upper vertebral body part and a lower vertebral body part, and the upper vertebral body part and the lower vertebral body part are axially connected by threads; a plurality of screw holes are correspondingly formed in the side wall of the upper vertebral body and the lower vertebral body in a radial direction, and a length fixing screw is also arranged between the screw holes of the upper vertebral body part and the lower vertebral body part; and end plate part fixing screws are respectively arranged on the two end plate parts. The connecting assembly has both the supporting function of the artificial vertebral body and the movement performance of the artificial intervertebral disc, is adjustable in length, can realize the immediate stability after anterior cervical surgery, play a supporting role, and also realize the immediate movement function reconstruction after anterior cervical surgery, so that the movement performance of the connecting assembly is highly bionic with that of the normal cervical vertebrae. The disadvantage of this design is that the stability of the reconstructed vertebral body after subtotal resection is relatively poor, relying only on the upper screw and the lower screw for fixation easily leads to the failure of the operation. Moreover, the implantation of the screws will affect the movement function of anteflexion, and the assembly is easy to sink when placed.

SUMMARY OF THE PRESENT DISCLOSURE

[0004] In order to solve the problems of the prior art, the present invention provides a two-segment bionic cervical intervertebral disc system for connecting to a vertebral body. The system can reduce the fusion of two segments, preserve the movement function of cervical vertebrae, and effectively treat cervical vertebra diseases.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solution: [0006] the two-segment bionic cervical intervertebral disc system for connecting to a vertebral body comprises an upper end plate, an artificial intervertebral disc and a lower end plate which are sequentially connected; [0007] the upper end plate has a first curved surface structure matched with an upper vertebral body, the lower end plate has a second curved surface structure matched with a lower vertebral body, and the first curved surface structure and the second curved surface structure are both porous layers; [0008] the upper end plate and the artificial intervertebral disc are connected by a first movable bionic part; the artificial intervertebral disc and the lower end plate are connected by a second movable bionic part; and [0009] the artificial intervertebral disc is of a cup-shaped structure, bolts used for fixation with the vertebral bodies on two sides are arranged on the artificial intervertebral disc, and the cup-shaped structure has porous surfaces on two sides and polished surfaces on the front and rear sides.

[0010] According to one or more embodiments of the present invention, the first movable bionic part comprises an upper gasket and an upper connecting block; [0011] a first hemisphere is arranged on the upper gasket, the lower surface of the upper end plate has a first recessed part, and the first hemisphere is in contact with the first recessed part to form a ball-and-socket structure; and [0012] the upper gasket and the upper connecting block are fixed, and the upper connecting block is fixedly connected to the upper end of the artificial intervertebral disc.

[0013] According to one or more embodiments of the present invention, the upper gasket comprises an upper gasket body, and the first hemisphere is arranged near a front side of the upper gasket body; clamping slots used for connection with the upper connecting block are formed on two sides of the upper gasket body; the upper connecting block comprises an upper connecting block body, clamping blocks used for connection with the upper gasket body are arranged on the upper surface of the upper connecting block body, and an inverted T-shaped block connected to the upper end of the artificial intervertebral disc is arranged on the lower surface of the upper connecting block body. [0014] According to one or more embodiments of the present invention, a first mounting groove and a second mounting groove are formed on the upper end of the artificial intervertebral disc; [0015] a plurality of bolt holes are formed on a front side of the artificial intervertebral disc and penetrate from the front side to two sides, and two adjacent bolt holes have different penetrating directions.

[0016] According to one or more embodiments of the present invention, the artificial intervertebral disc further comprises anti-withdrawing nuts which are arranged at outer sides of the bolt holes and are used for limiting the bolts.

[0017] According to one or more embodiments of the present invention, both the first mounting groove and the second mounting groove are provided with anti-withdrawing fasteners; and each of the anti-withdrawing fasteners comprises an anti-withdrawing fastener body, a protrusion is arranged at one side of the anti-withdrawing fastener body, and a blocking bar is arranged on the other side.

[0018] According to one or more embodiments of the present invention, the second movable bionic part comprises a lower gasket and a lower connecting block; [0019] a second hemisphere is arranged under the lower gasket, the lower surface of 10 the lower connecting block has a second recessed part, and the second hemisphere is in contact with the second recessed part to form a ball-and-socket structure; [0020] the lower connecting block is fixedly connected to the lower end of the artificial intervertebral disc, and the lower gasket and the lower end plate are fixed.

[0021] According to one or more embodiments of the present invention, the lower 15 gasket comprises a lower gasket body, and the second hemisphere is arranged near a front side of the lower gasket body; clamping slots for connection with the lower connecting block are formed on two sides of the lower gasket body; [0022] the lower connecting block comprises a lower connecting block body, a groove is formed on the lower surface of the lower connecting block body, and a T-shaped block connected to the lower end of the artificial intervertebral disc is arranged on the upper surface of the lower connecting block body.

[0023] According to one or more embodiments of the present invention, the area of each of the upper end and lower end of the artificial intervertebral disc is larger than the cross-sectional area of a middle part, the porous surface is a curved surface, and outer edges of two sides form a hyperbolic shape.

[0024] According to one or more embodiments of the present invention, inverted teeth are also provided on the first curved surface structure and the second curved surface structure and are inclined to the front side; and [0025] the bolt comprises a blind nut and a threaded rod, one end of the threaded rod close to the blind nut is a cylindrical rod with equal pitch, and the other end of the threaded rod away from the blind nut is a pointed rod with variable pitch, and the pitch on the pointed rod gradually increases toward a pointed end.

[0026] Compared with the prior art, the present invention has the following beneficial effects.

[0027] The upper end plate and the lower end plate of the present invention can provide immediate stability by means of the inverted tooth structure of a prosthesis. The longterm stability depends on the fusion of the porous structure printed on the surface of the prosthesis and the bony end plates of the vertebral body. The upper part of the artificial vertebral body is designed as a cup-shaped structure to reduce the subsidence and displacement of the vertebral body, and each of the sides of the artificial vertebral body is designed as a printed porous surface, which is conducive to the ingrowth of bone trabeculae in the later period, achieving permanent stability and reconstruction of the vertebral bodies. Side screws are used to stabilize the artificial vertebral body in the center and reduce the backward displacement of the artificial vertebral body to prevent the spinal cord from being squeezed. The artificial intervertebral disc provided by the embodiment of the present invention is combined with the artificial vertebral body, so as to completely replace the traditional ACCF and change it into ACCNF, which not only can completely decompress and relieve the compression of the spinal cord, but also can restore the movement function of two segments in a bionic manner, and has an irreplaceable role in preventing the up-and-down degeneration of adjacent segments of the cervical vertebrae. The device has a good application prospect. The system can reduce the fusion of two segments, preserve the movement function of cervical vertebrae, and effectively treat cervical vertebra diseases.

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described here are for explanatory purposes only, and are not intended to limit the scope of the present invention in any way In addition, the shapes and scale dimensions of each component in the drawings are only schematic, which is used to help the understanding of the present invention, but not to specifically limit the shapes and scale dimensions of each component of the present invention. In the drawings: [0029] FIG. 1 is a perspective view of a two-segment bionic cervical intervertebral disc system for connecting to a vertebral body; [0030] FIG. 2 is front view of a two-segment bionic cervical intervertebral disc system for connecting to a vertebral body; [0031] FIG. 3 is a side view of a two-segment bionic cervical intervertebral disc system for connecting to a vertebral body; [0032] FIG. 4 is a schematic diagram of an upper end plate in an optional embodiment of the present invention; [0033] FIG. 5 is a schematic diagram of an upper gasket in an optional embodiment of the present invention; [0034] FIG. 6 is a schematic diagram of an upper connecting block in an optional embodiment of the present invention; [0035] FIG. 7 is a schematic diagram of an artificial intervertebral disc in an optional embodiment of the present invention; [0036] FIG. 8 is a schematic diagram of a bolt in an optional embodiment of the present invention; [0037] FIG. 9 is a schematic diagram of an anti-withdrawing nut in an optional embodiment of the present invention; [0038] FIG. 10 is a schematic diagram of an anti-withdrawing fastener in an optional embodiment of the present invention; [0039] FIG. 11 is a schematic diagram of a lower connecting block in an optional embodiment of the present invention; [0040] FIG. 12 is a schematic diagram of a lower end plate in an optional embodiment of the present invention; [0041] FIG. 13 is a front view of a lower end plate in an optional embodiment of the present invention; and [0042] FIG. 14 is a schematic diagram of a usage status of the two-segment bionic cervical intervertebral disc system for connecting to a vertebral body of the present invention.

DESCRIPTION OF THE EMBODIMENTS

[0043] In order to make those skilled in the art better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely in the following with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are merely a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without involving any inventive effort all fall within the scope of the present invention.

[0044] It should be noted that when a component is referred to as being "arranged on" another component, the component may be directly on another component or there may also be an intermediate component. When a component is considered to be "connected" to another component, the component may be directly connected to another component or there may be an intermediate component at the same time. The terms used herein such as "vertical", "horizontal", "left", "right" and similar expressions are only for the purpose of illustration, and do not represent the only embodiment.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments, but are not intended to limit the disclosure. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

[0046] As shown in FIG. 1 to FIG. 13, the present invention provides a two-segment bionic cervical intervertebral disc system for connecting to a vertebral body which comprises an upper end plate 11, an artificial intervertebral disc 12 and a lower end plate 14 which are sequentially connected.

[0047] The upper end plate 11 has a first curved surface structure 111 matched with an upper vertebral body, the lower end plate 14 has a second curved surface structure 144 matched with a lower vertebral body, and the first curved surface structure 111 and the second curved surface structure 144 are both porous layers.

[0048] The upper end plate 11 and the artificial intervertebral disc 12 are connected by a first movable bionic part; and the artificial intervertebral disc 12 and the lower end plate 14 are connected by a second movable bionic part.

[0049] The artificial intervertebral disc 12 is of a cup-shaped structure. Bolts 13 used for fixation with the vertebral bodies on two sides are arranged on the artificial intervertebral disc 12. The cup-shaped structure has porous surfaces 123 on two sides and polished surfaces 122 on the front side and rear sides.

[0050] The upper end plate 11 and the lower end plate 14 of the present invention can provide immediate stability by means of the inverted tooth structure 112, 143 of a prosthesis. The long-term stability depends on the fusion of the porous structure printed on the surface of the prosthesis and the bony end plates of the vertebral body. The upper part of the artificial vertebral body is designed as a cup-shaped structure to reduce the subsidence and displacement of the vertebral body. The sides of the artificial vertebral body is designed as a printed porous surface 123, which is conducive to the ingrowth of bone trabeculae in the later period, achieving permanent stability and reconstruction of the vertebral bodies. Moreover, side screws 13 are used to stabilize the artificial vertebral body in the center and reduce the backward displacement of the artificial vertebral body to prevent the spinal cord from being squeezed.

[0051] As shown in FIG. 4, FIG. 12 and FIG. 13, inverted teeth are also arranged on the first curved surface structure 111 and the second curved surface structure 144 and are inclined to the front side.

[0052] For example, the inverted teeth 112 are arranged on the first curved surface structure 111, and the inverted teeth 143 are arranged on the second curved surface structure 144. The porous layer is integrally formed by 3D (three-dimensional) printing.

The first curved surface structure 111 and the second curved surface structure 144 are structurally matched with the upper vertebral body and the lower vertebral body so as to ensure that they are closely matched with each other during mounting to realize the effective substitution effect of artificial prostheses. The porous layer can also form mutual fusion with bones subsequently in the human body to achieve consolidation.

[0053] As an optional embodiment, as shown in FIG. 5 and FIG. 3, the first movable bionic part comprises an upper gasket 18 and an upper connecting block 15. A first hemisphere 181 is provided on the upper gasket 18. The lower surface of the upper end plate 11 has a first recessed part, and the first hemisphere 181 is in contact with the first recessed part to form a ball-and-socket structure. The upper gasket 18 is fixed to the upper connecting block 15 which is fixedly connected to the upper end of the artificial intervertebral disc 12. The ball-and-socket structure can simulate the joint structure of a human body and realize the swing and rotation of joints.

[0054] Specifically, as shown in FIG. 5, the upper gasket 18 comprises an upper gasket body 182, and the first hemisphere 181 is arranged near a front side of the upper gasket body 182. Clamping slots for connection with the upper connecting block 15 are formed on two sides of the upper gasket body 182 and specifically are rectangular notches. [0055] As shown in FIG. 6, the upper connecting block 15 comprises an upper connecting block body 151. Clamping blocks 152 used for connection with the upper gasket body 182 are arranged on the upper surface of the upper connecting block body 151. An inverted T-shaped block 153 connected to the upper end of the artificial intervertebral disc 12 is arranged on the lower surface of the upper connecting block body 151. The clamping block 152 is a right-angled triangle. The right-angled sides of the two clamping blocks 152 are arranged oppositely, and are used for clamping the rectangular notches to realize clamping and fixation.

[0056] A first mounting groove 121 matched with the inverted T-shaped block 153 is formed in the upper end of the artificial intervertebral disc 12. The inverted T-shaped block 153 can be inserted into the first mounting groove 121 to realize quick mounting. [0057] As shown in FIG. 7, a plurality of bolt holes 16 are formed on a front side of the artificial intervertebral disc 12 and penetrate from the front side to two sides, and two adjacent bolt holes 16 have different penetrating directions. The present embodiment provides four bolt holes 16, two of which are inclined to the left and the other two of which are inclined to the right. The four bolt holes 16 are used for fixing the vertebral bodies on the left side and the right side. The staggered arrangement ensures more stable fixation. [0058] As shown in figures, the area of each of the upper end and the lower end of the artificial intervertebral disc 12 is larger than the cross-sectional area of a middle part.

The porous surface 123 is a curved surface, and outer edges of two sides form a hyperbolic shape. Under the condition of ensuring sufficient supporting force, the two sides of the artificial intervertebral disc 12 can achieve fusion.

[0059] As shown in FIG. 8, the bolt 13 comprises a blind nut 131 and a threaded rod 132. One end of the threaded rod 132 close to the blind nut 131 is a cylindrical rod with equal pitch to ensure that the bolt is not loosened after being tightened. The other end of the threaded rod 132 away from the blind nut 131 is a pointed rod with variable pitch, and the pitch on the pointed rod gradually increases toward a pointed end, which can facilitate the rapid screwing of the bolt in surgery. The end of the blind nut 131 is provided with an inner hexagon, which is used for screwing the bolt in cooperation with a tool.

[0060] As shown in FIG. 9, the artificial intervertebral disc 12 further comprises anti-withdrawing nuts 20 which are arranged at outer sides of the bolt holes 16 and are used for limiting the positions of the bolts 13. The anti-withdrawing nut 20 is of a cylindrical structure with a left-hand thread on the outside. An operation opening, such as an inner hexagonal structure, is formed in one end [0061] As shown in FIG. 10, in order to prevent the upper connecting block 15 or the lower connecting block 17 from slipping out, the artificial intervertebral disc 12 also comprises anti-withdrawing fasteners 21 for limiting the sliding out of the upper connecting block 15 or the lower connecting block 17. The anti-withdrawing fasteners 21 are arranged on two sides of an end of the first mounting groove 121 or/and the second mounting groove 124. The anti-withdrawing fastener 21 comprises an anti-withdrawing fastener body 211. A protrusion 212 is arranged at one side of the anti-withdrawing fastener body 211, and a blocking bar 213 is arranged on the other side. The protrusion 212 is arranged in a sliding chute, and the anti-withdrawing fastener body 211 is used for limiting the position.

[0062] As shown in FIG. 11 and FIG. 3, the second movable bionic part comprises a lower gasket 19 and a lower connecting block 17.

[0063] A second hemisphere is arranged on the second gasket 19. The lower surface of the lower connecting block 17 has a second recessed part. The second hemisphere is in contact with the second recessed part to form a ball-and-socket structure. The specific structure of the second movable bionic part is the same as that of the first movable bionic part.

[0064] The lower connecting block 17 is fixedly connected to the lower end of the artificial intervertebral disc 12, and the lower gasket 19 and the upper surface of the lower end plate 141 are fixed.

[0065] The lower gasket 19 comprises a lower gasket body, and the second hemisphere is arranged near a front side of the lower gasket body. Clamping slots for connection with the lower clamping blocks 142 are formed on two sides of the lower gasket body. The structural schematic diagram of the lower gasket 19 is not given in the present embodiment, and the structure of which may be referred to FIG. 5.

[0066] As shown in FIG. 11, the lower connecting block 17 comprises a lower connecting block body 171. A groove is formed on the lower surface of the lower connecting block body 171. A T-shaped block 172 connected to the lower end of the artificial intervertebral disc 12 is arranged on the upper surface of the lower connecting block body 171. The second mounting groove 124 matched with the inverted T-shaped block 173 is arranged at the lower end of the artificial intervertebral disc 12.

[0067] As shown in FIG. 14, the surgery process of the two-segment bionic cervical intervertebral disc system for connecting to a vertebral body provided by the present invention is as follows: [0068] performing conventional cervical anterior approach, partially resecting compressed and hyperplastic vertebral bodies, slotting, treating cartilage end plates in upper and lower intervertebral spaces after subtotal resection, placing artificial prosthesis components with an appropriate size, fixing the artificial prosthesis with 3.5 mm or 4.0 mm bolts to remaining subtotal resected vertebral bodies on two sides through the bolt holes of the artificial vertebral body, and rebuilding the integrity and stability of subtotal resected vertebral bodies 2; [0069] then measuring the height, width and depth of the upper and lower intervertebral spaces, selecting a 3D printed artificial intervertebral disc 12 with an appropriate size, and connecting it to the artificial vertebral body through clamping slots, wherein the upper end plate 11 and the lower end plate 14 can provide immediate stability by means of the inverted tooth structure 111, 143 of the prosthesis, the long-term stability depends on the fusion of the porous structure printed on the surface of the prosthesis and the bony end plates of the vertebral bodies, wherein the upper part of the artificial vertebral body is designed as a cup-shaped structure to reduce the subsidence and displacement of the vertebral body 2, and the sides is designed as a printed porous surface 123, which is conducive to the ingrowth of bone trabeculae in the later period, achieving permanent stability and reconstruction of the vertebral bodies 2; and [0070] finally, clamping toward the center through locking plates of the clamping slots to prevent prosthesis parts of the lower end plate 14 and the upper end plate 11 from slipping (wherein the tail ends of the bolt holes 16 of the artificial vertebral body is designed as a left-hand thread device to tighten the nuts to prevent the bolt from backing out), rinsing the incision, placing a drainage tube, stopping bleeding carefully, sewing layer by layer, and finishing the operation.

[0071] In conclusion, the two-segment bionic cervical intervertebral disc system for connecting to a vertebral body provided by the present invention restores the integrity and stability of the subtotal resected vertebral body 2 in a bionic manner and replaces a titanium mesh component of ACCF with the three-dimensional printed vertebral body 1. The 3D printed vertebral body uses the cup-shaped design at the top to reduce the subsidence of the artificial vertebral body after operation. Surface treatment is performed on a cup-shaped prosthesis surface contacting the vertebral body to facilitate bone ingrowth and achieve permanent stability. The side bolts 13 are used to stabilize the artificial vertebral body in the center and reduce the backward displacement of the artificial vertebral body to prevent the spinal cord from being squeezed.

[0072] In particular, the 3D printed artificial intervertebral disc 12 is implanted into the upper and lower intervertebral space. After the 3D printed artificial intervertebral disc 12 is connected to the artificial vertebral body through the clamping slots, the 3D printed artificial intervertebral disc 12 is locked by locking plate devices designed in front so as to reduce the forward sliding of the 3D printed artificial intervertebral disc when the artificial intervertebral disc is extended backward. A blocking structure is designed behind the clamping slot to prevent the prosthesis from moving backward when the cervical vertebra bends forward.

[0073] As an alternative, the 3D printed vertebral body is designed to have polished surfaces at front and rear sides, so that hyperostosis at the back of the vertebral body after operation is reduced to prevent osteophyte from forming to compress the spinal cord again, and hyperplasia is reduced in front to prevent heterotopic ossification from forming to cause the reduction of intervertebral disc activity and even replacement failure. The two sides of the vertebral body are designed with a 3D printed porous surface, which is conducive to the ingrowth of bone trabeculae after operation to achieve bone fusion and achieve permanent stability, and the 3D printed vertebral body truly becomes a bionic substitute for the original vertebral body. The upper and lower artificial intervertebral discs also retain the bony end plate structure to the greatest extent.

[0074] The artificial intervertebral disc 12 provided by the embodiment of the present invention is combined with the artificial vertebral body, so as to completely replace the traditional ACCF and change it into ACCNF, which not only can relieve the compression to the spinal cord, but also can restore the movement function of two segments in a bionic manner, and has an irreplaceable role in preventing the up-and-down degeneration of adjacent segments of the cervical vertebrae. The device has a good application prospect.

[0075] It should be noted that in the description of the present invention, the terms "first" and "second" are only used for describing purposes and distinguishing similar objects.

There is no sequence between them, and they cannot be understood as indicating or implying relative importance. Moreover, in the descriptions of the present invention, unless otherwise noted, the meaning of "multiple" is two or more.

[0076] It should be understood that the above description is for purposes of graphic illustration and not for limitation. By reading the above description, many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art. Therefore, the scope of the present invention should not be determined with reference to the above description, but should be determined with reference to the foregoing claims and the full range of equivalents to which the claims are entitled. The disclosures of all articles and references, including patent applications and publications are incorporated herein by reference for the purpose of comprehensiveness. The omission of any aspect of the subject matter disclosed herein in the forgoing claims is not intended to disclaim such subject matter, nor should it be considered that the applicant does not consider the subject as a part of the disclosed invention subject.

Claims

WHAT IS CLAIMED IS: 1. A two-segment bionic cervical intervertebral disc system for connecting to a vertebral body, comprising an upper end plate (11), an artificial intervertebral disc (12) and a lower end plate (14) which are sequentially connected, wherein the upper end plate (11) has a first curved surface structure (111) matched with an upper vertebral body, the lower end plate (14) has a second curved surface structure (144) matched with a lower vertebral body, and the first curved surface structure (111) and the second curved surface structure (144) are both porous layers; wherein the upper end plate (11) and the artificial intervertebral disc (12) are connected by a first movable bionic part; the artificial intervertebral disc (12) and the lower end plate (14) are connected by a second movable bionic part; and wherein the artificial intervertebral disc (12) is of a cup-shaped structure, bolts (13) used for fixation with the vertebral bodies on two sides are arranged on the artificial intervertebral disc (12), and the cup-shaped structure has porous surfaces (123) on two sides and polished surfaces (122) on the front and rear sides.
2. The two-segment bionic cervical intervertebral disc system for connecting to a vertebral body of claim 1, wherein the first movable bionic part comprises an upper gasket (18) and an upper connecting block (15), wherein a first hemisphere (181) is arranged on the upper gasket (18), a lower surface of the upper end plate (11) has a first recessed part, and the first hemisphere (181) is in contact with the first recessed part to form a ball-and-socket structure; and the upper gasket (18) and the upper connecting block (15) are fixed, and the upper connecting block (15) is fixedly connected to an upper end of the artificial intervertebral disc (12).
3. The two-segment bionic cervical intervertebral disc system for connecting to a vertebral body of claim 2, wherein the upper gasket (18) comprises an upper gasket body (182), and the first hemisphere (181) is arranged near a front side of the upper gasket body (182); clamping slots for connection with the upper connecting block (15) are formed on two sides of the upper gasket body (182); the upper connecting block (15) comprises an upper connecting block body (151), clamping blocks (152) used for connection with the upper gasket body (182) are arranged on an upper surface of the upper connecting block body (151), and an inverted T-shaped block (153) connected to the upper end of the artificial intervertebral disc (12) is arranged on a lower surface of the upper connecting block body (151).
4. The two-segment bionic cervical intervertebral disc system for connecting to a vertebral body of any preceding claim, wherein; a first mounting groove (121) and a second mounting groove (124) are formed in the upper end of the artificial intervertebral disc (12); and a plurality of bolt holes (16) are formed on a front side of the artificial intervertebral disc (12) and penetrate from the front side to two sides, and two adjacent bolt holes (16) have different penetrating directions.
5. The two-segment bionic cervical intervertebral disc system for connecting to a vertebral body of claim 4, wherein the artificial intervertebral disc (12) further comprises anti-withdrawing nuts (20) which are arranged at outer sides of the bolt holes and are used for limiting the bolts (13).
6. The two-segment bionic cervical intervertebral disc system for connecting to a vertebral body of claims 4 or 5, wherein both the first mounting groove (121) and the second mounting groove (124) are provided with anti-withdrawing fasteners (21), wherein each of the anti-withdrawing fasteners (21) comprises an anti-withdrawing fastener body (211), a protrusion (212) is arranged at one side of the anti-withdrawing fastener body (211), and a blocking bar (213) is arranged on the other side.
7. The two-segment bionic cervical intervertebral disc system for connecting to a vertebral body of any preceding claim, wherein the second movable bionic part comprises a lower gasket (19) and a lower connecting block (17), wherein a second hemisphere is arranged under the second gasket (19), a lower surface of the lower connecting block (17) has a second recessed part, and the second hemisphere is in contact with the second recessed part to form a ball-and-socket structure; and the lower connecting block (17) is fixedly connected to a lower end of the artificial intervertebral disc (12), and the lower gasket (19) and the lower end plate (14) are fixed.
8. The two-segment bionic cervical intervertebral disc system for connecting to a vertebral body of any preceding claim, wherein the lower gasket (19) comprises a lower gasket body, and the second hemisphere is arranged near a front side of the lower gasket body; clamping slots for connection with the lower clamping blocks (142) are formed on two sides of the lower gasket body; the lower connecting block (17) comprises a lower connecting block body (171), a groove is formed on the lower surface of the lower connecting block body (171), and a T-shaped block (172) connected to the lower end of the artificial intervertebral disc (12) is arranged on an upper surface of the lower connecting block body (171).
9. The two-segment bionic cervical intervertebral disc system for connecting to a vertebral body of any preceding claim, wherein the area of each of the upper end and lower end of the artificial intervertebral disc (12) is larger than the cross-sectional area of a middle part, the porous surface (123) is a curved surface, and outer edges of two sides form a hyperbolic shape.
10. The two-segment bionic cervical intervertebral disc system for connecting to a vertebral body of any preceding claim, wherein inverted teeth (112,143) are also arranged on the first curved surface structure (111) and the second curved surface structure (144) and are inclined to the front side; and the bolt (13) comprises a blind nut (131) and a threaded rod (132), one end of the threaded rod (132) close to the blind nut (131) is a cylindrical rod with equal pitch, and the other end of the threaded rod (132) away from the blind nut (131) is a pointed rod with variable pitch, and the pitch on the pointed rod gradually increases toward a pointed end.