Artificial intervertebral disc prosthesis

Abstract

The invention belongs to the technical field of medical instruments, and particularly discloses an artificial intervertebral disc prosthesis which comprises an upper end plate, a nucleus pulposus and a lower end plate which are sequentially arranged, and a spherical groove is formed in the upper end plate. The end, facing the upper end plate, of the nucleus pulposus is provided with a ball head matched with the spherical groove, the ball head is located in the spherical groove so that the nucleus pulposus and the upper end plate can rotate relatively, and the end, away from the ball head, of the nucleus pulposus is provided with at least two elastic supporting parts. The ends, away from the ball head, of the at least two elastic supporting parts are located in the groove. The device can be used for buffering and damping, and can meet the normal spine movement requirement of a human body.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to an artificial intervertebral disc prosthesis. Background Art

[0002] As an orthopedic implantable medical device, the artificial cervical intervertebral disc is used to replace the diseased intervertebral disc, thereby relieving compression on the spinal cord or nerves, while retaining the height and mobility of the intervertebral disc in the replaced segment, maintaining normal movement of adjacent segments, and slowing down degeneration of adjacent segments.

[0003] The cervical intervertebral disc prosthesis in the related art mainly includes an upper end plate, a nucleus pulposus and a lower end plate, but the movement between the nucleus pulposus and the upper end plate and the lower end plate is restricted, resulting in limited movement between adjacent cones, making it difficult to meet the movement requirements of a normal intervertebral disc in the human body. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, an embodiment of the present invention provides an artificial intervertebral disc prosthesis that can buffer and reduce shock and meet the normal spinal movement requirements of the human body.

[0005] The artificial intervertebral disc prosthesis of an embodiment of the present invention comprises an upper end plate, a nucleus pulposus and a lower end plate which are arranged in sequence, the upper end plate being provided with a spherical groove; a ball head matching the spherical groove is provided at one end of the nucleus pulposus facing the upper end plate, the ball head is located in the spherical groove so that the nucleus pulposus and the upper end plate can rotate relative to each other, at least two elastic support parts are provided at one end of the nucleus pulposus away from the ball head; a groove is provided on the end face of the lower end plate facing the nucleus pulposus, and at least two ends of the elastic support parts away from the ball head are both located in the groove.

[0006] In this embodiment, a spherical groove is provided on the upper end plate, and the nucleus pulposus includes a ball head that matches the spherical groove, so that the upper end plate and the nucleus pulposus can achieve universal rotation through the cooperation of the spherical groove and the ball head. At the same time, the nucleus pulposus includes at least two elastic support parts, and the end of the elastic support part away from the ball head is arranged in the groove of the lower end plate. Since the elastic support part is elastic, the distance between the upper end plate and the lower end plate can vary to a certain extent. Therefore, the nucleus pulposus has a shock-absorbing effect, so that the adjacent vertebrae can perform flexion, extension, lateral bending and rotation through the cooperation between the upper end plate, the nucleus pulposus and the lower end plate. At the same time, since the elastic support part is elastic, the pressure can be dispersed by the elastic support part to achieve the effect of buffering and shock absorption.

[0007] In this embodiment, a gap is formed between the outer periphery of at least two of the elastic support parts and the inner wall of the groove.

[0008] In this embodiment, a protrusion is provided on one end of the side wall of the groove close to the ball head so as to limit the elastic support portion through the protrusion to prevent it from falling out of the groove.

[0009] In this embodiment, the elastic support portion includes a bracket and a support seat, one end of the bracket is connected to the ball head, the support seat is arranged at an end of the bracket away from the ball head, and the support seat is located in the groove.

[0010] In this embodiment, the support is arranged to protrude in an arc shape toward the outside of the nucleus pulposus.

[0011] In this embodiment, the elastic support portion further includes a seat cushion, and the seat cushion is arranged at an end of the support seat away from the bracket.

[0012] In this embodiment, a first inclined surface is provided on the inner side of the seat cushion, and the first inclined surface is inclined toward the outer side of the seat cushion from one end of the seat cushion adjacent to the bracket to the end away from the bracket; and / or a second inclined surface is provided on the outer side of the seat cushion, and the second inclined surface is inclined toward the inner side of the seat cushion from one end of the seat cushion adjacent to the bracket to the end away from the bracket.

[0013] In this embodiment, the elastic support portion is a biocompatible metal elastic support portion; and / or the ball head is a polymer material ball head; and / or the seat cushion is a polymer material seat cushion.

[0014] In this embodiment, the inner wall of the spherical groove is provided with a wear-resistant coating; and / or, the inner wall of the groove is provided with a wear-resistant coating. And / or, the surface of the upper end plate in contact with the cone is provided with a 3D printed lattice structure; and / or, the surface of the lower end plate in contact with the cone is provided with a 3D printed lattice structure.

[0015] In this embodiment, a third inclined surface is provided on the outer peripheral edge of one end of the upper end plate facing the nucleus pulposus, and the third inclined surface is inclined upward from the middle of the upper end plate to the outer side of the upper end plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is an exploded view of an artificial intervertebral disc prosthesis according to an embodiment of the present invention.

[0017] Figure 2 is a three-dimensional view of an upper end plate according to an embodiment of the present invention.

[0018] Figure 3 is a cross-sectional view of an artificial intervertebral disc prosthesis according to an embodiment of the present invention.

[0019] Figure 4 It is a cross-sectional view of the artificial intervertebral disc prosthesis according to an embodiment of the present invention under load.

[0020] Figure 5 is a three-dimensional view of a lower end plate according to an embodiment of the present invention.

[0021] Reference numerals: 1. Upper end plate; 11. Spherical groove; 12. Third inclined plane; 13. First cone; 131. First guide channel; 14. First matching part; 15. First bone groove; 2. Nucleus pulposus; 21. Ball head; 22. Elastic support part; 221. Bracket; 222. Support seat; 223. Seat cushion; 2231. First inclined plane; 2232. Second inclined plane; 224. Support plate; 3. Lower end plate; 31. Groove; 32. Raised part; 33. Second cone; 331. Second guide channel; 34. Second matching part; 35. Second bone groove. DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0023] In this embodiment, if Figure 1 and Figure 2 As shown, the artificial intervertebral disc prosthesis includes an upper end plate 1, a nucleus pulposus 2 and a lower end plate 3 which are arranged in sequence, and a spherical groove 11 is arranged on the upper end plate 1. A ball head 21 matching the spherical groove 11 is arranged at one end of the nucleus pulposus 2 facing the upper end plate 1, and the ball head 21 is located in the spherical groove 11 so that the nucleus pulposus 2 and the upper end plate 1 can rotate relative to each other, and at least two elastic support parts 22 are arranged at one end of the nucleus pulposus 2 away from the ball head 21. A groove 31 is arranged on the end surface of the lower end plate 3 facing the nucleus pulposus 2, and at least two elastic support parts 22 are located in the groove 31 at one end away from the ball head 21.

[0024] Specifically, the radius R1 of the spherical groove 11 is 4 mm to 10 mm, for example, the radius R1 of the spherical groove 11 can be 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm, etc. Correspondingly, since the ball head 21 matches the spherical groove 11, the radius R2 of the ball head 21 can be 4 mm to 10 mm, and the radius R1 of the spherical groove 11 and the radius R2 of the ball head 21 can be adjusted according to actual needs, and are not limited here.

[0025] In this embodiment, at least two elastic support parts 22 are evenly spaced along the circumference of the ball head 21, which is conducive to the stable movement of the nucleus pulposus 2 relative to the lower end plate 3. Specifically, the number of the elastic support parts 22 can be 2, 3, 4, 5, 6, 7, 8 or more, and no matter how many the elastic support parts 22 are, these elastic support parts 22 are evenly spaced along the circumference of the ball head 21, which can provide more stable support for the ball head 21, and when the ball head 21 is subjected to pressure in different directions of the upper end plate 1, the deformation of the nucleus pulposus 2 in different directions can be kept as consistent as possible, thereby improving the comfort of the patient.

[0026] The curvature of the outer surface of the upper end plate 1 and the lower end plate 3 in contact with the cone can be printed out after processing and converting the patient's CT data using a 3D printing device, so that the curvature of the prosthesis and the cone is highly matched to eliminate the phenomenon of uneven stress distribution and stress concentration.

[0027] In this embodiment, a spherical groove 11 is provided on the upper end plate 1, and the nucleus pulposus 2 includes a ball head 21 matching the spherical groove 11, so that the upper end plate 1 and the nucleus pulposus 2 can achieve universal rotation through the cooperation of the spherical groove 11 and the ball head 21. At the same time, the nucleus pulposus 2 includes at least two elastic support parts 22, and the end of the elastic support part 22 away from the ball head 21 is arranged in the groove 31 of the lower end plate 3. Since the elastic support part 22 is elastic, the distance between the upper end plate 1 and the lower end plate 3 can vary to a certain extent. Therefore, the nucleus pulposus 2 has a shock-absorbing effect, so that the adjacent vertebral bodies can perform flexion, extension, lateral bending and rotation through the cooperation between the upper end plate 1, the nucleus pulposus 2 and the lower end plate 3. At the same time, since the elastic support part 22 is elastic, the pressure can be dispersed by the elastic support part 22 to achieve the effect of buffering and shock absorption.

[0028] In this embodiment, a gap is formed between the outer periphery of at least two elastic support parts 22 and the inner wall of the groove 31, so that relative translation can be achieved between the nucleus pulposus 2 and the lower end plate 3. The intervertebral disc prosthesis realizes non-restrictive motion and has a translatable rotation center, allowing adjacent vertebrae to perform flexion, extension, scoliosis, rotation and translation movements. At the same time, the elasticity of the elastic support parts 22 produces a shock-absorbing effect, thereby retaining the original motion function of the spine, which is beneficial to improving the effects of complications such as increased load on adjacent vertebrae and accelerated degeneration caused by fusion fixation, and maintaining the stability of the cervical vertebrae sequence.

[0029] Specifically, the gap L formed between the outer periphery of the elastic support portion 22 and the side wall of the groove 31 at the corresponding position can be 0mm~2mm. For example, L can be 0mm, 0.5mm, 1mm, 1.5mm or 2mm, etc. The value of L can be set according to actual needs, and it is sufficient to achieve a certain range of relative translation between the nucleus pulposus 2 and the lower end plate 3, and is not limited here. In addition, in this embodiment, the elastic support portion 22 and the groove 31 can achieve radial relative translation between the two within a circumferential range of 360°, which can increase the flexibility of the prosthesis. Of course, in other embodiments, the elastic support portion 22 and the groove 31 can also achieve radial relative translation within a range of less than 360° in the circumferential direction, or the elastic support portion 22 and the groove 31 can achieve reciprocating relative translation in a certain direction.

[0030] In this embodiment, if Figure 1 and Figure 3 As shown, a protrusion 32 is provided on one end of the side wall of the groove 31 close to the ball head 21 so as to limit the elastic support part 22 from falling out of the groove 31 through the protrusion 32 .

[0031] For example, the groove 31 may be a stepped groove 31 , and the outer diameter of the end of the side wall of the groove 31 adjacent to the nucleus pulposus 2 is smaller than the outer diameter of the end away from the nucleus pulposus 2 , so that an annular protrusion 32 may be formed at the end adjacent to the nucleus pulposus 2 .

[0032] By providing the raised portion 32 to limit the elastic support portion 22, the elastic support portion 22 can be prevented from escaping from the groove 31, which is beneficial for reliable connection between the nucleus pulposus 2 and the lower end plate 3, thereby enabling reliable connection between adjacent vertebral bodies.

[0033] In this embodiment, if Figure 1 and Figure 3 As shown, the elastic support portion 22 includes a bracket 221 and a support seat 222 . One end of the bracket 221 is connected to the ball head 21 . The support seat 222 is disposed at an end of the bracket 221 away from the ball head 21 , and the support seat 222 is located in the groove 31 .

[0034] Specifically, the thickness A of the bracket 221 is 0.3 mm to 3 mm, for example, A can be 0.3 mm, 0.6 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm. If the thickness A of the bracket 221 is too small, it is not conducive to ensuring the strength of the elastic support part 22. If the thickness A of the bracket 221 is too large, it will reduce the toughness of the elastic support part 22, which is not conducive to buffering and shock absorption through the elastic support part 22. The width B of the bracket 221 can be set to 0.5 mm to 3 mm, for example, B can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm. Similarly, if the width B of the bracket 221 is too small, it is not conducive to ensuring the strength of the elastic support part 22. If the width B of the bracket 221 is too large, it will reduce the toughness of the elastic support part 22, which is not conducive to buffering and shock absorption through the elastic support part 22. In detail, the thickness A of the bracket 221 refers to the dimension of the bracket 221 in the radial direction of the plurality of elastic support parts 22 , and the width B of the bracket 221 refers to the dimension of the bracket 221 in the circumferential direction of the plurality of elastic support parts 22 .

[0035] It should be noted that the support seat 222 is located in the groove 31, and the elastic support portion 22 can prevent the elastic support portion 22 from slipping out of the groove 31 through the cooperation between the support seat 222 and the protrusion 32. The cross-sectional dimension of the support seat 222 is larger than the cross-sectional dimension of the bracket 221, and the support seat 222 can form a stable support for the nucleus pulposus 2, while the bracket 221 can make the elastic support portion 22 have a certain flexibility.

[0036] In this embodiment, if Figure 3 As shown, the support 221 is convexly arranged in an arc shape toward the outside of the nucleus pulposus 2. It is understandable that by arranging the support 221 to be convexly arranged in an arc shape toward the outside of the nucleus pulposus 2, the support 221 can have elastic force in the distribution direction of the nucleus pulposus 2 and the lower end plate 3, thereby achieving vertebral body buffering.

[0037] Specifically, the radius R3 corresponding to the arc formed by the bracket 221 is 1-5.0 mm, for example, R3 can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm or 5 mm, etc. The value of R3 can be selected as needed and is not limited here.

[0038] In this embodiment, if Figure 3 As shown, the elastic support portion 22 further includes a seat cushion 223 , and the seat cushion 223 is disposed at one end of the support seat 222 away from the bracket 221 .

[0039] Specifically, the shape and size of the contact surface between the seat cushion 223 and the support seat 222 match the shape and size of the contact surface between the support seat 222 and the seat cushion 223 .

[0040] It can be understood that the seat cushion 223 is provided to support the support seat 222 and improve the wear resistance.

[0041] In this embodiment, if Figure 3 and Figure 4 As shown, a first inclined surface 2231 is disposed on the back of the seat cushion 223 , and the first inclined surface 2231 is inclined toward the outer side of the seat cushion 223 from one end of the seat cushion 223 adjacent to the bracket 221 to the other end away from the bracket 221 .

[0042] It should be noted that when the human head is subjected to extreme loads, Figure 4 As shown, the elastic support portion 22 is compressed so that the first inclined surface 2231 can contact the bottom of the groove 31. The surface-to-surface contact between the nucleus pulposus 2 and the lower end plate 3 can reduce the pressure on the contact surface, thereby facilitating the enhancement of the stability and wear resistance between the nucleus pulposus 2 and the lower end plate 3.

[0043] In this embodiment, if Figure 3 and Figure 4 As shown, a second inclined surface 2232 is disposed on the outer side of the seat cushion 223 , and the second inclined surface 2232 is inclined toward the inner side of the seat cushion 223 from one end of the seat cushion 223 adjacent to the bracket 221 to the end away from the bracket 221 .

[0044] It can be understood that when the human head is subjected to an extreme load, the elastic support portion 22 is under pressure, and while the first inclined surface 2231 contacts the bottom of the groove 31, the second inclined surface 2232 can contact the side wall of the groove 31. Through the surface-to-surface contact, the deformation of the elastic support portion 22 is limited, and the deformation degree of the nucleus pulposus 2 can be controlled to ensure that the relative movement degree of adjacent vertebrae is consistent with the range of human activities.

[0045] In this embodiment, the elastic support part 22 is a biocompatible metal elastic support part, and / or the ball head 21 is a polymer material ball head, and / or the seat cushion 223 is a polymer material seat cushion.

[0046] Among them, the elastic support part 22 is a biocompatible metal elastic support part. For example, the bracket 221 is a nickel-titanium alloy bracket 221. The support seat 222 is a nickel-titanium alloy support seat 222. The support plate 224 is a nickel-titanium alloy support plate. The support plate 224, the bracket 221 and the support seat 222 can all be made of nickel-titanium alloy. The nickel-titanium alloy is light in weight and high in strength. It can reduce the pressure on the vertebral body and withstand a large load. The nickel-titanium alloy also has a shape memory effect and good biocompatibility. It is non-toxic and non-irritating to human tissue, does not cause immune rejection, and can also promote the adhesion and proliferation of bone cells, which is conducive to the combination with surrounding bone tissue and improves the fixation effect. Of course, the support plate 224, the bracket 221 and the support seat 222 can also be made of other materials, which are not limited here. The seat cushion 223 can be a polyethylene seat cushion. Specifically, the seat cushion 223 is made of high cross-linked-ultra-high molecular weight polyethylene as a raw material. Polyethylene has excellent wear resistance, biocompatibility and elasticity, can increase service life, is conducive to combining with surrounding bone tissue, improves fixation effect, and absorbs and disperses impact force. The ball head 21 is a polymer material ball head. For example, the ball head 21 is made of highly cross-linked ultra-high molecular weight polyethylene as a raw material. The ball head 21 and the elastic support part 22 can be injection molded, which is conducive to improving the overall strength of the nucleus pulposus 2, simplifying the structure of the nucleus pulposus 2, and improving the reliability of the connection between the ball head 21 and the elastic support part 22. Since the ball head 21 and the elastic support part 22 can be made of different materials, the overall performance of the nucleus pulposus 2 is improved by combining the advantages of different materials.

[0047] Specifically, in this embodiment, Figure 3 and Figure 4 As shown, a support plate 224 is connected between the bracket 221 and the ball head 21. The support plate 224 and the bracket 221 are integrally formed. The support plate 224 and the ball head 21 can be connected by injection molding or a connector, or by other connection methods.

[0048] The seat cushion 223 and the support seat 222 may be connected via a connector or other processes such as injection molding, which is not limited here.

[0049] In this embodiment, the inner wall of the spherical groove 11 is provided with a wear-resistant coating. And / or, the inner wall of the groove 31 is provided with a wear-resistant coating.

[0050] Specifically, the thickness T of the wear-resistant coating is 2μm~4μm, for example, T can be 2μm, 2.5μm, 3μm, 3.5μm or 4μm, and the coating hardness HV 0.02 of the wear-resistant coating is 1800~2800 (that is, using the Vickers hardness test method, the coating hardness range measured under the condition of a test force of 0.02 kgf is 1800 to 2800 HV).

[0051] The inner wall of the spherical groove 11 is provided with a wear-resistant coating, which can improve the wear resistance of the upper end plate 1, thereby facilitating the service life of the upper end plate 1. The inner wall of the groove 31 is provided with a wear-resistant coating, which can improve the wear resistance of the lower end plate 3, thereby facilitating the service life of the lower end plate 3.

[0052] In this embodiment, if Figure 1 and Figure 3 As shown, a plurality of first cones 13 are arranged at intervals on the surface of the upper end plate 1 away from the nucleus pulposus 2. And / or, a plurality of second cones 33 are arranged at intervals on the surface of the lower end plate 3 away from the nucleus pulposus 2.

[0053] Among them, the first cone 13 is arranged on the surface of the upper end plate 1 away from the nucleus pulposus 2, so that the first cone 13 can be inserted into the vertebral body in the body and better combined with the body tissue, which is conducive to improving the reliability of the connection between the upper end plate 1 and the vertebral body. Similarly, the second cone 33 is arranged on the surface of the lower end plate 3 away from the nucleus pulposus 2, so that the second cone 33 can be inserted into the vertebral body in the body and better combined with the body tissue, which is conducive to improving the reliability of the connection between the lower end plate 3 and the vertebral body.

[0054] In this embodiment, if Figure 1 , Figure 3 and Figure 5 As shown, the upper end plate 1 is provided with a first bone outlet groove 15. The lower end plate 3 is provided with a second bone outlet groove 35. The first bone outlet groove 15 is located on one side of the first cone 13, and is recessed into the upper surface of the upper end plate 1. A first guide channel 131 is provided on the first cone 13. The first guide channel 131 is arranged on the side of the first cone 13 in the vertical direction, and is connected to the first bone outlet groove 15. When the upper end plate 1 is implanted into the vertebral body, the bone chips generated when the first cone 13 penetrates the corresponding vertebral body are introduced into the first bone outlet groove 15, which can facilitate the insertion of the first cone 13, promote the growth of bone tissue into the first cone 13, increase the effect of bone integration, and help improve the long-term stability and service life of the prosthesis.

[0055] The second bone outlet groove 35 is located on one side of the second cone 33 and is recessed into the lower surface of the lower end plate 3. A second guide channel 331 is provided on the second cone 33. The second guide channel 331 is arranged on the side of the second cone 33 along the vertical direction and is connected to the second bone outlet groove 35. When the lower end plate 3 is implanted into the vertebral body, the second cone 33 guides the bone chips generated when the corresponding vertebral body is pierced into the second bone outlet groove 35, which can facilitate the insertion of the second cone 33 and promote the growth of bone tissue into the second cone 33, thereby increasing the effect of bone integration and helping to improve the long-term stability and service life of the prosthesis.

[0056] In this embodiment, the surface of the upper end plate 1 away from the nucleus pulposus 2 is provided with a first connection portion (not shown in the figure) for in-vivo tissue growth. And / or, the surface of the lower end plate 3 away from the nucleus pulposus 2 is provided with a second connection portion (not shown in the figure) for in-vivo tissue growth.

[0057] For example, both the first connection portion and the second connection portion may be trabecular structures.

[0058] It can be understood that by providing the first connection portion on the surface of the upper end plate 1, when the upper end plate 1 is implanted in the body, it is convenient for the body tissue to grow into the first connection portion, which is conducive to promoting the combination of the body tissue and the upper end plate 1, and improving the connection strength between the upper end plate 1 and the vertebral body. Similarly, by providing the second connection portion on the surface of the lower end plate 3, when the lower end plate 3 is implanted in the body, it is convenient for the body tissue to grow into the second connection portion, which is conducive to promoting the combination of the body tissue and the lower end plate 3, and improving the connection strength between the lower end plate 3 and the vertebral body.

[0059] In this embodiment, the upper end plate 1 is a titanium alloy upper end plate 1 and / or the lower end plate 3 is a titanium alloy lower end plate 3.

[0060] It is understandable that the upper end plate 1 is made of titanium alloy, which has good biocompatibility and can make the upper end plate 1 coexist well with human tissue without inducing immune rejection or toxic reactions. Titanium alloy has excellent mechanical properties, including high strength and good toughness, which can make the upper end plate 1 maintain structural stability while bearing spinal loads. Titanium alloy is corrosion-resistant, which can improve the service life and stability of the upper end plate 1. Similarly, the lower end plate 3 is made of titanium alloy, which has good biocompatibility and can make the lower end plate 3 coexist well with human tissue without inducing immune rejection or toxic reactions. Titanium alloy has excellent mechanical properties, including high strength and good toughness, which can make the lower end plate 3 maintain structural stability while bearing spinal loads. Titanium alloy is corrosion-resistant, which can improve the service life and stability of the lower end plate 3.

[0061] Specifically, in this embodiment, the first connection portion of the surface of the upper end plate 1 in contact with the vertebral body is a 3D printed lattice structure. And / or, the second connection portion of the surface of the lower end plate 3 in contact with the vertebral body is a 3D printed lattice structure.

[0062] For example, the lattice structure may be a rhombic dodecahedron lattice structure.

[0063] It is understandable that the 3D printed lattice structure is provided on the surface of the upper end plate 1 in contact with the vertebral body, which can provide a larger surface area and three-dimensional gaps for the upper end plate 1, which is conducive to promoting the growth of bone tissue to the upper end plate 1, thereby improving the bonding strength. Similarly, the 3D printed lattice structure is provided on the surface of the lower end plate 3 in contact with the vertebral body, which can provide a larger surface area and three-dimensional gaps for the lower end plate 3, which is conducive to promoting the growth of bone tissue to the lower end plate 3, thereby improving the bonding strength.

[0064] In this embodiment, if Figure 1 and Figure 3 As shown, a third inclined surface 12 is provided on the outer peripheral edge of one end of the upper end plate 1 facing the nucleus pulposus 2 , and the third inclined surface 12 is inclined upward from the middle of the upper end plate 1 to the outer side of the upper end plate 1 .

[0065] Specifically, the inclination angle of the third inclined surface 12 is 5° to 10°. For example, the inclination angle of the third inclined surface 12 may be 5°, 6°, 7°, 8°, 9° or 10°.

[0066] It can be understood that by setting the third inclined surface 12 on the edge axis of the upper end plate 1, when the spine bends, the third inclined surface 12 on the upper end plate 1 can fit with the surface of the lower end plate 3 facing the upper end plate 1, thereby limiting the bending angle and avoiding excessive bending, which is beneficial to increasing the service life of the prosthesis.

[0067] In this embodiment, if Figure 1 As shown, a first matching portion 14 is provided on the upper end plate 1 , and a second matching portion 34 is provided on the lower end plate 3 corresponding to the first matching portion 14 , so as to match with the implant instrument through the first matching portion 14 and the second matching portion 34 .

[0068] For example, the first matching portion 14 is a slot arranged on one side of the upper end plate 1, and the corresponding second matching portion 34 is a slot arranged on one side of the lower end plate 3. The two clamping portions of the implant device can be correspondingly connected in the two slots to form a clamping state for the upper end plate 1 and the lower end plate 3.

[0069] It is understandable that the first matching portion 14 is provided on the upper end plate 1 and the second matching portion 34 is provided on the lower end plate 3. The first matching portion 14 and the second matching portion 34 are connected with the implant instrument to facilitate the connection between the implant instrument and the prosthesis.

[0070] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0071] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0072] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0073] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0074] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0075] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An artificial intervertebral disc prosthesis, characterized in that: It comprises an upper end plate, a nucleus pulposus and a lower end plate which are arranged in sequence, wherein the upper end plate is provided with a spherical groove; The end of the nucleus pulposus facing the upper end plate is provided with a ball head matching the spherical groove, the ball head is located in the spherical groove so that the nucleus pulposus and the upper end plate can rotate relative to each other, and the end of the nucleus pulposus facing away from the ball head is provided with at least two elastic support parts; The end surface of the lower end plate facing the nucleus pulposus is provided with a groove, and ends of at least two elastic support parts facing away from the ball head are both located in the groove.

2. The artificial intervertebral disc prosthesis according to claim 1, characterized in that: A gap is formed between the outer periphery of at least two of the elastic supporting parts and the inner wall of the groove.

3. The artificial intervertebral disc prosthesis according to claim 1, characterized in that: A convex portion is provided on one end of the side wall of the groove close to the ball head so as to limit the elastic supporting portion through the convex portion to prevent it from escaping from the groove.

4. The artificial intervertebral disc prosthesis according to claim 1, characterized in that: The elastic support portion includes a bracket and a support seat, one end of the bracket is connected to the ball head, the support seat is arranged at an end of the bracket away from the ball head, and the support seat is located in the groove.

5. The artificial intervertebral disc prosthesis according to claim 4, characterized in that: The support is arranged to protrude in an arc shape toward the outside of the nucleus pulposus.

6. The artificial intervertebral disc prosthesis according to claim 4, characterized in that: The elastic support portion further comprises a seat cushion, and the seat cushion is arranged at one end of the support seat away from the bracket.

7. The artificial intervertebral disc prosthesis according to claim 6, characterized in that: A first inclined surface is arranged on the inner side of the seat cushion, and the first inclined surface is arranged to be inclined toward the outer side of the seat cushion from one end of the seat cushion adjacent to the bracket to one end of the seat cushion away from the bracket; And / or, a second inclined surface is arranged on the outer side of the seat cushion, and the second inclined surface is arranged to be inclined toward the inner side of the seat cushion from one end of the seat cushion adjacent to the bracket to one end of the seat cushion away from the bracket.

8. The artificial intervertebral disc prosthesis according to claim 6, characterized in that: The elastic support part is a biocompatible metal elastic support part; And / or, the ball head is a ball head made of polymer material; And / or, the seat cushion is a polymer material seat cushion.

9. The artificial intervertebral disc prosthesis according to claim 1, characterized in that: The inner wall of the spherical groove is provided with a wear-resistant coating; And / or, the inner wall of the groove is provided with a wear-resistant coating; and / or, the surface of the upper end plate in contact with the cone is provided with a 3D printed lattice structure; And / or, the surface of the lower end plate in contact with the cone is provided with a 3D printed lattice structure.

10. The artificial intervertebral disc prosthesis according to claim 1, characterized in that: A third inclined surface is provided on the outer peripheral edge of one end of the upper end plate facing the nucleus pulposus, and the third inclined surface is inclined upward from the middle part of the upper end plate to the outer side of the upper end plate.

Images