Artificial intervertebral disc prosthesis

Abstract

The present invention belongs to the field of medical device technology and specifically discloses an artificial intervertebral disc prosthesis. The artificial intervertebral disc prosthesis includes an upper endplate, a nucleus pulposus, and a lower endplate arranged in sequence, with the upper endplate 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 endplate. The ball head is located within the spherical groove so that the nucleus pulposus and the upper endplate can rotate relative to each other. At least two elastic support portions are provided at one end of the nucleus pulposus facing away from the ball head. A groove is provided on the end surface of the lower endplate facing the nucleus pulposus, with the ends of the at least two elastic support portions facing away from the ball head located within the groove. The present invention can provide cushioning and shock absorption, and can meet the normal spinal movement requirements of the human body.

Description

Technical Field

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

[0002] An artificial cervical intervertebral disc is an orthopedic implantable medical device that 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 related technologies mainly includes an upper end plate, a nucleus pulposus and a lower end plate. However, the movement between the nucleus pulposus and the upper and lower end plates is restricted, resulting in limited movement between adjacent cones, making it difficult to meet the movement requirements of normal intervertebral discs in the human body. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, an embodiment of the present invention provides an artificial intervertebral disc prosthesis that can cushion 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 includes an upper end plate, a nucleus pulposus and a lower end plate arranged in sequence, wherein the upper end plate is 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, and the ball head is located in the spherical groove to enable relative rotation between the nucleus pulposus and the upper end plate, and 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 surface 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, so 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 buffering and shock-absorbing effects.

[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 from falling out of the groove through the protrusion.

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

[0017] Figure 2 4 is a perspective 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 4 is a perspective view of a lower end plate according to an embodiment of the present invention.

[0021] Reference numerals:

[0022] 1. Upper end plate; 11. Spherical groove; 12. Third inclined surface; 13. First cone; 131. First guide channel; 14. First matching portion; 15. First bone groove; 2. Nucleus pulposus; 21. Ball head; 22. Elastic support portion; 221. Bracket; 222. Support seat; 223. Seat cushion; 2231. First inclined surface; 2232. Second inclined surface; 224. Support plate; 3. Lower end plate; 31. Groove; 32. Raised portion; 33. Second cone; 331. Second guide channel; 34. Second matching portion; 35. Second bone groove. DETAILED DESCRIPTION

[0023] The 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.

[0024] In this embodiment, if Figure 1 and Figure 2 As shown, the artificial intervertebral disc prosthesis includes an upper endplate 1, a nucleus pulposus 2, and a lower endplate 3, which are arranged in sequence. The upper endplate 1 is provided with a spherical groove 11. The end of the nucleus pulposus 2 facing the upper endplate 1 is provided with a ball head 21 that matches the spherical groove 11. The ball head 21 is located in the spherical groove 11 to allow relative rotation between the nucleus pulposus 2 and the upper endplate 1. The end of the nucleus pulposus 2 facing away from the ball head 21 is provided with at least two elastic support portions 22. The end surface of the lower endplate 3 facing the nucleus pulposus 2 is provided with a groove 31, and the ends of the at least two elastic support portions 22 facing away from the ball head 21 are both located in the groove 31.

[0025] 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. 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. 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.

[0026] In this embodiment, at least two elastic support portions 22 are evenly spaced along the circumference of the ball head 21, which facilitates stable movement of the nucleus pulposus 2 relative to the lower endplate 3. Specifically, the number of elastic support portions 22 can be 2, 3, 4, 5, 6, 7, 8, or more. Regardless of the number of elastic support portions 22, these elastic support portions 22 are evenly spaced along the circumference of the ball head 21, which can provide more stable support for the ball head 21. Moreover, when the ball head 21 is subjected to pressure from different directions on the upper endplate 1, the deformation of the nucleus pulposus 2 in different directions can be kept as consistent as possible, thereby improving patient comfort.

[0027] 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.

[0028] 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 that matches 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, so that the nucleus pulposus 2 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 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 through the elastic support part 22 to achieve the effects of buffering and shock absorption.

[0029] 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-restricted motion and has a translatable rotation center, allowing adjacent vertebrae to perform flexion, extension, lateral bending, 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.

[0030] 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, as long as a certain range of relative translation between the nucleus pulposus 2 and the lower end plate 3 can be achieved, and is not limited here. In addition, in this embodiment, the elastic support portion 22 and the groove 31 can achieve radial relative translation 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 circumferential range of less than 360°, or the elastic support portion 22 and the groove 31 can achieve reciprocating relative translation in a certain direction.

[0031] 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 portion 22 from falling out of the groove 31 through the protrusion 32 .

[0032] 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 , thereby forming an annular protrusion 32 at the end adjacent to the nucleus pulposus 2 .

[0033] By providing the protrusion 32 to limit the elastic support portion 22, the elastic support portion 22 can be prevented from escaping from the groove 31, which is conducive to the reliable connection between the nucleus pulposus 2 and the lower end plate 3, thereby ensuring reliable connection between adjacent vertebral bodies.

[0034] 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 arranged at the end of the bracket 221 away from the ball head 21 , and the support seat 222 is located in the groove 31 .

[0035] 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 the buffering and shock absorption by 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 the buffering and shock absorption by the elastic support part 22. Specifically, 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 .

[0036] 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 falling 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, so that the support seat 222 can provide stable support for the nucleus pulposus 2, while the bracket 221 can also provide a certain degree of flexibility to the elastic support portion 22.

[0037] In this embodiment, if Figure 3 As shown, the bracket 221 is arranged in an arc shape convexly toward the outside of the nucleus pulposus 2. It is understandable that by arranging the bracket 221 in an arc shape convexly toward the outside of the nucleus pulposus 2, the bracket 221 can have elastic force in the distribution direction of the nucleus pulposus 2 and the lower end plate 3, thereby achieving vertebral body cushioning.

[0038] Specifically, the radius R3 of 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.

[0039] In this embodiment, if Figure 3 As shown, the elastic support portion 22 further includes a seat cushion 223 , which is disposed at one end of the support seat 222 away from the bracket 221 .

[0040] 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 .

[0041] It can be understood that the seat cushion 223 is provided to support the support seat 222 and improve the wear resistance.

[0042] In this embodiment, if Figure 3 and Figure 4 As shown, a first inclined surface 2231 is provided on the back of the seat cushion 223 , and the first inclined surface 2231 is inclined toward the outside 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 .

[0043] It should be noted that when the human head is subjected to extreme loads, such as 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 enhancement of the stability and wear resistance between the nucleus pulposus 2 and the lower end plate 3.

[0044] In this embodiment, if Figure 3 and Figure 4 As shown, a second inclined surface 2232 is provided 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 .

[0045] It can be understood that when the human head is subjected to an extreme load, the elastic support part 22 is under pressure, and the first inclined surface 2231 contacts the bottom of the groove 31 while 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 part 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.

[0046] In this embodiment, the elastic support portion 22 is a biocompatible metal elastic support portion, and / or the ball head 21 is a polymer material ball head, and / or the seat cushion 223 is a polymer material seat cushion.

[0047] 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. 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. Nickel-titanium alloy also has a shape memory effect and good biocompatibility. It is non-toxic and non-irritating to human tissue and will not cause immune rejection. It can also promote the adhesion and proliferation of bone cells, which is beneficial to the combination with surrounding bone tissue and improve 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 highly cross-linked-ultra-high molecular weight polyethylene as raw material. Polyethylene has excellent wear resistance, biocompatibility and elasticity, which can increase service life, facilitate integration with surrounding bone tissue, improve fixation effect, and absorb and disperse 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 raw material. The ball head 21 and the elastic support part 22 can be injection molded, which is beneficial to improve the overall strength of the nucleus pulposus 2, simplify the structure of the nucleus pulposus 2, and improve 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 can be improved by combining the advantages of different materials.

[0048] 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.

[0049] The seat cushion 223 and the support seat 222 may be connected via a connector or other processes such as injection molding, which are not limited here.

[0050] 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.

[0051] Specifically, the thickness T of the wear-resistant coating is 2 μm to 4 μm, for example, T can be 2 μm, 2.5 μm, 3 μm, 3.5 μm or 4 μm, and the coating hardness HV 0.02 of the wear-resistant coating is 1800 to 2800 (that is, using the Vickers hardness test method, the coating hardness measured under the condition of a test force of 0.02 kgf is in the range of 1800 to 2800 HV).

[0052] 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 increase in 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 increase in the service life of the lower end plate 3.

[0053] In this embodiment, if Figure 1 and Figure 3 As shown, a plurality of first cones 13 are provided 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 provided at intervals on the surface of the lower end plate 3 away from the nucleus pulposus 2.

[0054] The first cone 13 is provided on the surface of the upper endplate 1 facing away from the nucleus pulposus 2, allowing the first cone 13 to be inserted into the vertebral body in the body and better integrate with the body tissue, thereby improving the reliability of the connection between the upper endplate 1 and the vertebral body. Similarly, the second cone 33 is provided on the surface of the lower endplate 3 facing away from the nucleus pulposus 2, allowing the second cone 33 to be inserted into the vertebral body in the body and better integrate with the body tissue, thereby improving the reliability of the connection between the lower endplate 3 and the vertebral body.

[0055] 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.

[0056] 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 in the vertical direction on the side of the second cone 33 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.

[0057] In this embodiment, a first connection portion (not shown) is provided on the surface of the upper endplate 1 facing away from the nucleus pulposus 2 for in vivo tissue ingrowth. And / or a second connection portion (not shown) is provided on the surface of the lower endplate 3 facing away from the nucleus pulposus 2 for in vivo tissue ingrowth.

[0058] For example, both the first connecting portion and the second connecting portion may be trabecular structures.

[0059] It can be understood that by providing the first connection portion on the surface of the upper endplate 1, when the upper endplate 1 is implanted in the body, it is possible to facilitate the growth of body tissue into the first connection portion, which is conducive to promoting the bonding of body tissue with the upper endplate 1 and improving the connection strength between the upper endplate 1 and the vertebral body. Similarly, by providing the second connection portion on the surface of the lower endplate 3, when the lower endplate 3 is implanted in the body, it is possible to facilitate the growth of body tissue into the second connection portion, which is conducive to promoting the bonding of body tissue with the lower endplate 3 and improving the connection strength between the lower endplate 3 and the vertebral body.

[0060] 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.

[0061] 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.

[0062] Specifically, in this embodiment, the first connection portion of the surface of the upper endplate 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 endplate 3 in contact with the vertebral body is a 3D printed lattice structure.

[0063] For example, the lattice structure may be a rhombic dodecahedron lattice structure.

[0064] It is understood that providing a 3D printed lattice structure on the surface of the upper endplate 1 that contacts the vertebral body can provide the upper endplate 1 with a larger surface area and three-dimensional voids, which can facilitate the growth of bone tissue toward the upper endplate 1, thereby improving the bonding strength. Similarly, providing a 3D printed lattice structure on the surface of the lower endplate 3 that contacts the vertebral body can provide the lower endplate 3 with a larger surface area and three-dimensional voids, which can facilitate the growth of bone tissue toward the lower endplate 3, thereby improving the bonding strength.

[0065] 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 .

[0066] 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°.

[0067] 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 improving the service life of the prosthesis.

[0068] In this embodiment, if Figure 1 As shown, the upper end plate 1 is provided with a first matching portion 14 , and the lower end plate 3 is provided with a second matching portion 34 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 .

[0069] 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 to the two slots to form a clamping state for the upper end plate 1 and the lower end plate 3.

[0070] 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 device, which can facilitate the connection between the implant device and the prosthesis.

[0071] In the description of the present invention, it should 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" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0072] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0073] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0074] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0075] In the present invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" 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 specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification, as well as features of different embodiments or examples, unless they are mutually inconsistent.

[0076] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify 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 that matches the spherical groove, the ball head is located in the spherical groove to enable the nucleus pulposus and the upper end plate to 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; 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 the end of the bracket away from the ball head, and the support seat is located in the groove; The support is arranged to protrude in an arc shape toward the outside of the nucleus pulposus; The cross-sectional dimension of the support seat is larger than the cross-sectional dimension of the bracket.

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

4. The artificial intervertebral disc prosthesis according to claim 1, characterized in that: The elastic support portion further includes a seat cushion, which is arranged at one end of the support seat away from the bracket.

5. The artificial intervertebral disc prosthesis according to claim 4, characterized in that: 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 an end of the seat cushion adjacent to the bracket to an 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 an end of the seat cushion adjacent to the bracket to an end away from the bracket.

6. The artificial intervertebral disc prosthesis according to claim 5, characterized in that: The elastic support portion is a biocompatible metal elastic support portion; And / or, the ball head is a ball head made of a polymer material; And / or, the seat cushion is made of a polymer material.

7. 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.

8. 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 of the upper end plate to the outer side of the upper end plate.

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