Intervertebral implant prosthesis

Abstract

The application provides an intervertebral implant prosthesis arranged between a first vertebral body and a second vertebral body, the intervertebral implant prosthesis comprising: a prosthesis body configured to be connected to the first vertebral body; a cover plate rotatably arranged on the prosthesis body, the cover plate configured to be connected to the second vertebral body; a support part connected between the prosthesis body and the cover plate, the support part having a length adjustable; a first operation part movably arranged on the prosthesis body; and a first transmission mechanism drivingly connected between the support part and the first operation part, when the first operation part is moved, the first transmission mechanism adjusts the length of the support part, thereby driving the cover plate to rotate. The technical scheme of the application can effectively solve the problem of poor bone fusion effect in the related art.

Description

Technical Field

[0001] This invention relates to the field of implantable prosthesis technology, and more specifically, to an intervertebral disc implant. Background Technology

[0002] In modern society, due to factors such as prolonged desk work, unhealthy lifestyle habits, and aging, cervical spondylosis has become a common ailment affecting many people. Cervical intervertebral fusion is an important and widely used treatment method in cervical spine surgery. The purpose of cervical intervertebral fusion is to relieve pressure on important structures such as the spinal cord and nerve roots by removing diseased intervertebral disc tissue, restoring the stability and normal physiological function of the cervical spine. Simultaneously, suitable fusion material is implanted into the intervertebral space to promote bony fusion between the upper and lower vertebrae, thereby achieving a complete cure for the disease.

[0003] In existing technologies, interbody fusion cages often fail to fully consider the complex anatomy and individual differences of the human cervical spine. The superior and inferior endplates of the cervical vertebrae are not completely flat, but have a certain curvature and concave-convex shape, with subtle differences between individuals. However, it is difficult for the interbody fusion cage to fit tightly against the vertebral endplates. This mismatch leads to a reduced contact area between the interbody fusion cage and the vertebral body, resulting in local stress concentration. This not only increases the risk of interbody fusion cage displacement and subsidence, but also affects the growth and attachment of bone tissue on the surface of the interbody fusion cage, reducing the success rate of bone fusion. Summary of the Invention

[0004] The main objective of this invention is to provide an intervertebral disc implant to address the problem of poor bone fusion in related technologies.

[0005] To achieve the above objectives, according to one aspect of the present invention, an intervertebral disc implant is provided, disposed between a first vertebral body and a second vertebral body. The intervertebral disc implant includes: a prosthesis body for connection to the first vertebral body; a cover plate rotatably attached to the prosthesis body for connection to the second vertebral body; a support portion connected between the prosthesis body and the cover plate, the length of which is adjustable; a first operating portion movably disposed on the prosthesis body; and a first transmission mechanism drivingly connected between the support portion and the first operating portion. When the first operating portion is active, the first transmission mechanism adjusts the length of the support portion, thereby driving the cover plate to rotate.

[0006] Furthermore, the support includes a sleeve and a slide rod body slidably disposed within the sleeve, one of the sleeve and the slide rod body being connected to the cover plate and the first transmission mechanism, and the other of the sleeve and the slide rod body being connected to the prosthesis body.

[0007] Furthermore, the first transmission mechanism includes a curved rod and a swing rod. The two ends of the swing rod are hinged to the main body of the prosthesis and the curved rod, respectively. The curved rod bends toward the direction close to the swing rod. The curved rod is hinged to the support and is driven to the first operating part. When the first operating part moves, the curved rod swings, thereby adjusting the length of the support.

[0008] Furthermore, the curved rod includes a first rod body and a second rod body. The first rod body is hinged to the support part, the second rod body is driven to the first operating part, and the first rod body is hinged to the swing rod.

[0009] Furthermore, there is a first hinge point between the first rod and the support, a second hinge point between the first rod and the swing rod, and a connection point between the first rod and the second rod. The distance between the first hinge point and the second hinge point is greater than the distance between the second hinge point and the connection point.

[0010] Furthermore, the curved rod also includes a threaded cylinder disposed at the end of the second rod away from the first rod, and the first operating part includes a screw that is rotatably and swingably disposed, with the threaded cylinder sleeved on the screw.

[0011] Furthermore, the first operating part also includes a mounting base, the end of the screw is rotatably connected to the mounting base, the mounting base is rotatably connected to the prosthesis body, and the rotation axis of the screw and the rotation axis of the mounting base are set at an angle.

[0012] Furthermore, the intervertebral disc implant also includes a shield and a connector. The main body of the implant has an opening through which the screw protrudes. The shield is used to cover the opening. The main body of the implant has a threaded hole, and the connector passes through the shield and the threaded hole.

[0013] Furthermore, the intervertebral disc implant also includes a fixed vertebra, a second operating part, and a second transmission mechanism. The fixed vertebra is movably mounted on the body of the implant and is used to connect with the human body. The second operating part is movably mounted on the body of the implant and drives the fixed vertebra to move through the second transmission mechanism, so that the fixed vertebra can move to a position protruding from the cover plate.

[0014] Furthermore, the prosthesis body has a receiving groove, which includes a first sidewall and a second sidewall set at an angle. A second operating part is disposed on the first sidewall and includes a threaded moving block and a supporting vertebra disposed at the first end of the threaded moving block. The second end of the threaded moving block is the operating end. A second transmission mechanism includes a transmission block disposed on the second sidewall. The first end of the transmission block has a first mating inclined surface that cooperates with the supporting vertebra. The second end of the transmission block has a transmission inclined surface. A fixed vertebra is disposed on the second sidewall and includes a main body, a connecting vertebra, and a second mating inclined surface. The moving direction of the transmission block and the moving direction of the main body are set at an angle. The second mating inclined surface is disposed at the first end of the main body and cooperates with the transmission inclined surface. The connecting vertebra is disposed at the second end of the main body.

[0015] Applying the technical solution of this invention, the prosthesis body is fixedly connected to the first vertebral body (such as the lower vertebral body) to form the installation reference for the entire prosthesis; the cover plate is rotatably connected to the prosthesis body for connection to the second vertebral body (such as the upper vertebral body); the support portion is connected between the prosthesis body and the cover plate, and its length is adjustable; the first operating portion is movably disposed on the prosthesis body and forms a transmission connection with the support portion through the first transmission mechanism. During the implantation surgery, the surgeon first fixes the prosthesis body to the first vertebral body, at which point the cover plate is in its initial angle position. Subsequently, based on the actual tilt angle and shape of the second vertebral endplate, the surgeon drives the first transmission mechanism by operating the first operating portion. The movement of the first operating portion is converted into a change in the length of the support portion through the first transmission mechanism; when the length of the support portion increases, it pushes the cover plate to rotate away from the prosthesis body; when the length of the support portion decreases, the cover plate rotates towards the prosthesis body. By precisely controlling the amount of movement of the first operating portion, the surgeon can continuously and steplessly adjust the rotation angle of the cover plate relative to the prosthesis body until the cover plate and the second vertebral endplate are in contact. Under the same load, the increased contact area reduces contact stress and results in a more uniform stress distribution, effectively avoiding localized high-stress points and thus reducing the risk of prosthesis displacement, subsidence, or collapse during postoperative weight-bearing. Simultaneously, good interfacial adhesion creates ideal conditions for bone ingrowth. The tight contact between the prosthesis and the endplate eliminates large gaps, providing a stable mechanical environment for new bone formation. Therefore, the technical solution of this application effectively addresses the problem of poor bone fusion in related technologies. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 A three-dimensional structural schematic diagram of an embodiment of an intervertebral disc implant prosthesis according to the present invention is shown;

[0018] Figure 2 It shows Figure 1 A three-dimensional structural diagram of a portion of an intervertebral disc implant.

[0019] Figure 3 It shows Figure 1 A cross-sectional schematic diagram of an intervertebral disc implant;

[0020] Figure 4 It shows Figure 1 A three-dimensional structural diagram of the hidden prosthesis body and cover plate of the intervertebral disc implant.

[0021] The above figures include the following reference numerals:

[0022] 10. Prosthesis body; 11. Opening; 12. Threaded hole;

[0023] 20. Cover plate;

[0024] 30. Support part; 31. Sleeve; 32. Slide rod body;

[0025] 40. First operating part; 41. Screw; 42. Mounting base;

[0026] 50. First transmission mechanism; 51. Crank rod; 511. First rod body; 512. Second rod body; 513. Threaded cylinder; 52. Rocker rod;

[0027] 61. First hinge point; 62. Second hinge point; 63. Connection point; 64. Cover plate; 65. Connecting component;

[0028] 70. Fixed vertebra; 71. Main body; 72. Connecting vertebral body; 73. Second mating inclined plane;

[0029] 80. Second operating part; 81. Threaded moving block; 82. Abutting cone;

[0030] 90. Second transmission mechanism; 91. Transmission block; 92. First mating inclined surface; 93. Transmission inclined surface. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0033] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0034] like Figures 1 to 4 As shown, this application provides an intervertebral disc implant, disposed between a first vertebral body and a second vertebral body. An embodiment of the intervertebral disc implant of this application includes: a prosthesis body 10, a cover plate 20, a support portion 30, a first operating portion 40, and a first transmission mechanism 50. The prosthesis body 10 is used to connect to the first vertebral body; the cover plate 20 is rotatably mounted on the prosthesis body 10 and is used to connect to the second vertebral body; the support portion 30 is connected between the prosthesis body 10 and the cover plate 20, and the length of the support portion 30 is adjustable; the first operating portion 40 is movably disposed on the prosthesis body 10; the first transmission mechanism 50 is drively connected between the support portion 30 and the first operating portion 40. When the first operating portion 40 is active, the first transmission mechanism 50 adjusts the length of the support portion 30, thereby driving the cover plate 20 to rotate.

[0035] Using the technical solution of this embodiment, the prosthesis body 10 is fixedly connected to the first vertebral body (such as the lower vertebral body) to form the installation reference of the entire prosthesis; the cover plate 20 is rotatably connected to the prosthesis body 10 for connection to the second vertebral body (such as the upper vertebral body); the support part 30 is connected between the prosthesis body 10 and the cover plate 20, and its length is adjustable; the first operating part 40 is movably disposed on the prosthesis body 10 and forms a transmission connection with the support part 30 through the first transmission mechanism 50. During the implantation surgery, the doctor first fixes the prosthesis body 10 to the first vertebral body, at which time the cover plate 20 is in the initial angle position. Subsequently, according to the actual tilt angle and shape of the endplate of the second vertebral body, the doctor drives the first transmission mechanism 50 by operating the first operating part 40. The movement of the first operating part 40 is converted into a change in the length of the support part 30 through the first transmission mechanism 50; when the length of the support part 30 increases, it pushes the cover plate 20 to rotate away from the prosthesis body 10; when the length of the support part 30 decreases, the cover plate 20 rotates towards the prosthesis body 10. By precisely controlling the movement of the first operating part 40, the surgeon can continuously and steplessly adjust the rotation angle of the cover plate 20 relative to the prosthesis body 10 until the cover plate 20 and the second vertebral endplate are in contact. Under the same load, the increased contact area reduces contact stress and makes the stress distribution more uniform, effectively avoiding local high stress points, thereby reducing the risk of displacement, subsidence, or collapse of the prosthesis during postoperative weight-bearing. At the same time, good interface fit creates ideal conditions for bone ingrowth. The close contact between the prosthesis and the endplate eliminates large gaps, providing a stable mechanical environment for new bone formation. Therefore, the technical solution of this embodiment can effectively solve the problem of poor bone fusion in related technologies.

[0036] like Figures 1 to 4 As shown, the support part 30 includes a sleeve 31 and a slide rod 32 slidably disposed in the sleeve 31. The sleeve 31 is connected to the cover plate 20 and the first transmission mechanism 50, and the slide rod 32 is connected to the prosthesis body 10.

[0037] The sliding pair formed by the sleeve 31 and the slide rod 32 enables precise adjustment of the length of the support 30. When the first operating part 40 is driven by the first transmission mechanism 50, the first transmission mechanism 50 acts directly on the sleeve 31, causing the sleeve 31 to slide along the axial direction of the slide rod 32. Since the sleeve 31 is fixedly connected to the cover plate 20, the sliding displacement of the sleeve 31 directly drives the cover plate 20 to rotate around its hinge point with the prosthesis body 10, thereby achieving precise adjustment of the angle of the cover plate 20. The sleeve 31 is sleeved on the outside of the slide rod 32, and the two have a large contact area and good guiding fit. This sleeve-type sliding structure can provide excellent bending stiffness and torsional stiffness when subjected to compressive loads and shear forces between the vertebrae, ensuring that the support 30 can stably support the cover plate 20 after adjustment, and will not buckle or unexpectedly expand or contract under long-term physiological loads.

[0038] like Figures 1 to 4 As shown, the first transmission mechanism 50 includes a curved rod 51 and a swing rod 52. The two ends of the swing rod 52 are hinged to the prosthesis body 10 and the curved rod 51, respectively. The curved rod 51 bends toward the direction close to the swing rod 52. The curved rod 51 is hinged to the support part 30 and is transmitted to the first operating part 40. When the first operating part 40 moves, the curved rod 51 swings, thereby adjusting the length of the support part 30.

[0039] The curved rod 51 and the swing rod 52 constitute a linkage transmission mechanism. The curved rod 51 bends towards the swing rod 52, giving it two angled segments. The first operating part 40 pushes one end of the curved rod 51, causing it to swing around its hinge point with the swing rod 52, which in turn drives the other end of the curved rod 51 to extend and retract the support part 30. This bending design, without increasing the overall size of the prosthesis, converts the motion input by the first operating part 40 into the axial extension and retraction of the support part 30, achieving a change in transmission direction and stroke adaptation. This is particularly suitable for clinical needs where the internal space of intervertebral implants is limited and the operating direction is restricted. The swing rod 52 acts as a connecting rod, with one end hinged to the prosthesis body 10 (forming a fixed hinge point) and the other end hinged to the curved rod 51. The swing rod 52 follows the swing of the curved rod 51, constraining and guiding its trajectory, making its swing path more stable and predictable.

[0040] like Figures 1 to 4 As shown, the curved rod 51 includes a first rod body 511 and a second rod body 512. The first rod body 511 is hinged to the support part 30, the second rod body 512 is driven to the first operating part 40, and the first rod body 511 is hinged to the swing rod 52.

[0041] The first rod 511 and the second rod 512 constitute the two functional segments of the curved rod 51, realizing spatial separation and functional division of power input and output. The first rod 511, as the output segment, is hinged at its end to the support 30, directly converting the swing motion into the extension and retraction displacement of the support 30, thus driving the cover plate 20 to rotate. The second rod 512, as the input segment, is connected at its end to the first operating part 40, receiving the driving force from the first operating part 40. This segmented design gives the curved rod 51 a bent shape, enabling a compact arrangement of the transmission path within the limited internal space of the prosthetic body 10. The first rod 511 is hinged to the swing rod 52, allowing the first rod 511 to receive a constraint force from the swing rod 52 at the hinge point. When the second rod 512 is pushed by the first operating part 40, the curved rod 51 swings around the hinge point, and the end of the first rod 511 moves along an arc, thereby driving the extension and retraction of the support 30. The hinge between the swing arm 52 and the first rod 511 also precisely constrains the motion trajectory of the curved rod 51, preventing it from lateral swaying or twisting when under force, thus ensuring the stability and repeatability of the transmission process.

[0042] like Figures 1 to 4 As shown, the first rod 511 has a first hinge point 61 with the support part 30, the first rod 511 has a second hinge point 62 with the swing rod 52, and the first rod 511 and the second rod 512 have a connection point 63. The distance between the first hinge point 61 and the second hinge point 62 is greater than the distance between the second hinge point 62 and the connection point 63.

[0043] This distance relationship constitutes a lever amplification mechanism. The second hinge point 62 serves as the swing fulcrum of the crank member 51, the connection point 63 serves as the power input end (receiving driving force from the first operating part 40), and the first hinge point 61 serves as the power output end (driving the support part 30). Since the distance from the first hinge point 61 to the second hinge point 62 is greater than the distance from the second hinge point 62 to the connection point 63, according to the lever principle, under a constant input force, although the driving force obtained at the first hinge point 61 is less than that at the input end, the swing linear displacement of the first hinge point 61 is greater than that at the input end—that is, displacement amplification is achieved. During the adjustment of the intervertebral prosthesis, this displacement amplification effect allows the doctor to apply a small displacement at the first operating part 40 end to obtain a large extension stroke at the support part 30 end, thereby causing the cover plate 20 to rotate at a larger angle, expanding the coverage range of prosthesis angle adjustment, and being able to adapt to a wider range of vertebral endplate morphological differences. Secondly, the longer lever arm (from the first hinge point 61 to the second hinge point 62) also improves the resolution and sensitivity of the adjustment. Because the distance from the input end to the fulcrum is short, the angular displacement generated at the output end by the same input displacement is amplified more significantly by the lever, which allows the doctor to precisely adjust the angle of the cover plate 20 by finely controlling the movement of the first operating part 40, thereby improving the accuracy and controllability of the surgical operation.

[0044] like Figures 1 to 4 As shown, the curved rod 51 also includes a threaded cylinder 513 disposed at one end of the second rod 512 away from the first rod 511, and the first operating part 40 includes a screw 41 that is rotatably and swingably disposed, with the threaded cylinder 513 sleeved on the screw 41.

[0045] When the screw 41 is rotated, the threaded cylinder 513 moves along the axial direction of the screw 41. Since the threaded cylinder 513 is fixedly connected to the second rod 512, the linear movement of the threaded cylinder 513 directly drives the second rod 512 to move, thereby driving the entire curved rod 51 to swing around the second hinge point 62, ultimately causing the support part 30 to extend and retract. The screw drive has the characteristics of large transmission ratio and smooth movement. During the adjustment process, fine displacement control can be obtained by rotating the screw 41, and the angle of the cover plate 20 can be precisely adjusted to the ideal position. The screw 41 is set to be rotatable and swingable, so that the screw 41 can adaptively adjust its axial direction. Since the threaded cylinder 513 moves with the swing of the curved rod 51, its axial direction will change during the adjustment process. If the screw 41 is a fixed axis, axial misalignment and jamming will occur between the threaded cylinder 513 and the screw 41, resulting in transmission difficulties or increased wear. The oscillating design of the screw 41 allows its axis to deflect synchronously with the oscillation of the threaded cylinder 513, always maintaining coaxiality with the threaded cylinder 513. This ensures that the screw drive can operate smoothly at any angle position, effectively reducing the frictional resistance and wear of the threaded pair, and improving the reliability of the transmission and the smoothness of operation.

[0046] In addition, the first thread structure of the threaded cylinder 513 and the second thread structure of the screw 41 are both self-locking thread structures. The thread helix angle of the first thread structure is less than or equal to the equivalent friction angle of the first thread structure, and the thread helix angle of the second thread structure is less than or equal to the equivalent friction angle of the second thread structure.

[0047] The self-locking thread structure is crucial for ensuring positional stability in helical drives. When the helix angle is less than or equal to the equivalent friction angle, the helical pair will not automatically reverse under axial load, meaning the threaded pair possesses self-locking capability. After the surgeon adjusts the cover plate 20 to a position where it fully conforms to the second vertebral endplate by rotating the screw 41, the prosthesis needs to remain stable in this position for an extended period. Without self-locking, the continuous physiological compression load between the vertebrae postoperatively would act in the opposite direction on the support portion 30, transmitted through the first rod 511 and the second rod 512 to the threaded cylinder 513, generating a torque that causes the threaded cylinder 513 to retract axially along the screw 41. This would gradually shorten the length of the support portion 30, alter the angle of the cover plate 20, change the stress distribution at the bone fusion interface, and ultimately affect the fusion outcome. The self-locking thread structure, through a frictional self-locking mechanism, ensures that the threaded pair will not reverse under axial load, thereby precisely fixing the cover plate 20 in the final position adjusted during surgery, maintaining a tight fit between the prosthesis and the vertebral endplate, and providing a long-term stable mechanical environment for bone ingrowth.

[0048] like Figures 1 to 4 As shown, the first operating part 40 also includes a mounting base 42, the end of the screw 41 is rotatably connected to the mounting base 42, the mounting base 42 is rotatably connected to the prosthesis body 10, and the rotation axis of the screw 41 and the rotation axis of the mounting base 42 are set at an angle.

[0049] Mounting base 42 serves as a support base for screw 41, providing a stable mounting foundation for screw 41. The end of screw 41 is rotatably connected to mounting base 42, allowing screw 41 to rotate freely around its own axis to drive threaded cylinder 513 to move axially. Simultaneously, mounting base 42 is rotatably connected to prosthetic body 10, allowing the entire mounting base 42, along with screw 41, to swing relative to prosthetic body 10.

[0050] like Figures 1 to 4 As shown, the intervertebral disc implant also includes a shield 64 and a connector 65. The main body 10 of the implant has an opening 11 through which the screw 41 is exposed. The shield 64 is used to cover the opening 11. The main body 10 of the implant is provided with a threaded hole 12. The connector 65 passes through the shield 64 and the threaded hole 12.

[0051] The opening 11 allows the screw 41 to be exposed outside the prosthesis body 10 during surgery, facilitating rotational manipulation by the surgeon within the surgical field (using an L-shaped tool that engages with the screw 41 through the opening 11) to adjust the angle of the cover plate 20. The cover plate 64, by covering the opening 11, seals the outer surface of the prosthesis body 10 postoperatively, creating a smooth and complete interface. This prevents metal components from being exposed to the soft tissue environment, effectively reducing the risk of tissue irritation and inflammation, while also preventing fibrous tissue ingrowth into the prosthesis, preserving a clear interface for potential future reoperations.

[0052] like Figures 1 to 4 As shown, the intervertebral disc implant also includes a fixed vertebra 70, a second operating part 80, and a second transmission mechanism 90. The fixed vertebra 70 is movably mounted on the prosthesis body 10 and used to connect with the human body. The second operating part 80 is movably mounted on the prosthesis body 10 and drives the fixed vertebra 70 to move through the second transmission mechanism 90, so that the fixed vertebra 70 can move to a position protruding from the cover plate 20.

[0053] The fixed vertebra 70, acting as an auxiliary fixation element, provides a third fixation point for the prosthesis, in addition to the prosthesis body 10 and the cover plate 20. When the fixed vertebra 70 moves to a position protruding beyond the cover plate 20 under the drive of the second operating part 80 and the second transmission mechanism 90, it can penetrate or embed into the bone of the adjacent vertebral body, forming an additional mechanical anchor. In interbody fusion, the connection between the prosthesis body 10 and the first vertebral body, and the connection between the cover plate 20 and the second vertebral body, is mainly achieved through the friction of the endplate surface and bone ingrowth. However, in the early healing stage before bone fusion is complete, this fixation method carries a certain risk of micromovement. The second operating part 80 is set independently of the first operating part 40, allowing the extension of the fixed vertebra 70 and the angle adjustment of the cover plate 20 to be performed independently. After the surgeon completes the angle adjustment of the cover plate 20, the fixed vertebra 70 is then extended via the second operating part 80. The two operating systems do not interfere with each other, avoiding mutual influence during the adjustment process and making the surgical operation more orderly and precise.

[0054] like ​As shown, the prosthesis body 10 has a receiving groove, which includes a first sidewall and a second sidewall set at an angle. The second operating part 80 is disposed on the first sidewall and includes a threaded moving block 81 and an abutting cone 82 disposed at the first end of the threaded moving block 81. The second end of the threaded moving block 81 is the operating end. The second transmission mechanism 90 includes a transmission block 91 disposed on the second sidewall. The first end of the transmission block 91 has a first mating inclined surface 92 that cooperates with the abutting cone 82. The second end of the transmission block 91 has a transmission inclined surface 93. The fixed cone 70 is disposed on the second sidewall and includes a main body 71, a connecting cone 72, and a second mating inclined surface 73. The moving direction of the transmission block 91 and the moving direction of the main body 71 are set at an angle. The second mating inclined surface 73 is disposed at the first end of the main body 71 and cooperates with the transmission inclined surface 93. The connecting cone 72 is disposed at the second end of the main body 71.

[0055] The first and second sidewalls of the accommodating groove are angled, providing a spatially separated mounting reference for the second operating part 80 and the fixed vertebra 70. The second operating part 80 is disposed on the first sidewall, with the second end of its threaded moving block 81 serving as the operating end. The doctor rotates the operating end to move the threaded moving block 81, causing the abutting vertebra 82 at its first end to move synchronously. The abutting vertebra 82 forms an inclined surface fit with the first mating inclined surface 92 at the first end of the transmission block 91. When the abutting vertebra 82 is advanced, the contact between its conical surface and the first mating inclined surface 92 generates a thrust, pushing the transmission block 91 to slide. The transmission inclined surface 93 at the second end of the transmission block 91 forms another set of inclined surface fits with the second mating inclined surface 73 at the first end of the main body 71 of the fixed vertebra 70. When the transmission block 91 slides, the transmission inclined surface 93 pushes the second mating inclined surface 73 through the inclined surface action, causing the main body 71 of the fixed vertebra 70 to move, i.e., extend towards the cover plate 20. Through the series connection of two-stage inclined plane transmission, the rotational motion of the second operating part 80 is ultimately converted into the linear extension motion of the connecting vertebra 72 of the fixed vertebra 70.

[0056] In addition, the main body 71 is provided with elastic protrusions, and the second side wall has an installation channel for installing the fixing vertebra 70. The inner wall of the installation channel is provided with an anti-dislodgement groove, and the elastic protrusions and the anti-dislodgement groove are inserted and matched to prevent the fixing vertebra 70 from dislodging.

[0057] In the description of this invention, it should be understood that "a plurality of" means two or more. Directional terms such as "front, back, up, down, left, right," "horizontal, vertical, perpendicular, horizontal," and "top, bottom" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the outline of each component itself.

[0058] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated ninety degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0059] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An intervertebral disc implant, disposed between a first vertebral body and a second vertebral body, characterized in that, The intervertebral disc implant includes: The prosthesis body (10) is used to connect with the first vertebral body; A cover plate (20) is rotatably attached to the prosthesis body (10), the cover plate (20) being used to connect to the second vertebral body; A support (30) is connected between the prosthesis body (10) and the cover plate (20), and the length of the support (30) is adjustable; The first operating part (40) is movably disposed on the prosthesis body (10); The first transmission mechanism (50) is connected between the support part (30) and the first operating part (40). When the first operating part (40) moves, the first transmission mechanism (50) adjusts the length of the support part (30), thereby driving the cover plate (20) to rotate.

2. The intervertebral disc implant prosthesis according to claim 1, characterized in that, The support (30) includes a sleeve (31) and a slide rod (32) slidably disposed within the sleeve (31). One of the sleeve (31) and the slide rod (32) is connected to the cover plate (20) and the first transmission mechanism (50), and the other of the sleeve (31) and the slide rod (32) is connected to the prosthesis body (10).

3. The intervertebral disc implant prosthesis according to claim 1, characterized in that, The first transmission mechanism (50) includes a curved rod (51) and a swing rod (52). The two ends of the swing rod (52) are respectively hinged to the prosthetic body (10) and the curved rod (51). The curved rod (51) bends toward the direction close to the swing rod (52). The curved rod (51) is hinged to the support part (30). The curved rod (51) is driven to the first operating part (40). When the first operating part (40) moves, the curved rod (51) swings, thereby adjusting the length of the support part (30).

4. The intervertebral disc implant prosthesis according to claim 3, characterized in that, The curved rod (51) includes a first rod body (511) and a second rod body (512). The first rod body (511) is hinged to the support part (30), and the second rod body (512) is driven to the first operating part (40). The first rod body (511) is hinged to the swing rod (52).

5. The intervertebral disc implant prosthesis according to claim 4, characterized in that, The first rod (511) has a first hinge point (61) between it and the support part (30), the first rod (511) has a second hinge point (62) between it and the swing rod (52), and the first rod (511) and the second rod (512) have a connection point (63). The distance between the first hinge point (61) and the second hinge point (62) is greater than the distance between the second hinge point (62) and the connection point (63).

6. The intervertebral disc implant prosthesis according to claim 4, characterized in that, The crank member (51) further includes a threaded cylinder (513) disposed at one end of the second rod body (512) away from the first rod body (511), and the first operating part (40) includes a rotatable and swingable screw (41), and the threaded cylinder (513) is sleeved on the screw (41).

7. The intervertebral disc implant prosthesis according to claim 6, characterized in that, The first operating part (40) further includes a mounting base (42), the end of the screw (41) is rotatably connected to the mounting base (42), the mounting base (42) is rotatably connected to the prosthetic body (10), and the rotation axis of the screw (41) and the rotation axis of the mounting base (42) are set at an angle.

8. The intervertebral disc implant prosthesis according to claim 7, characterized in that, The intervertebral implant prosthesis also includes a shield (64) and a connector (65). The prosthesis body (10) has an opening (11), through which the screw (41) is exposed. The shield (64) is used to cover the opening (11). The prosthesis body (10) is provided with a threaded hole (12). The connector (65) passes through the shield (64) and the threaded hole (12).

9. The intervertebral disc implant according to any one of claims 1 to 8, characterized in that, The intervertebral implant also includes a fixed vertebra (70), a second operating part (80), and a second transmission mechanism (90). The fixed vertebra (70) is movably disposed on the body of the implant (10) and used to connect with the human body. The second operating part (80) is movably disposed on the body of the implant (10) and drives the fixed vertebra (70) to move through the second transmission mechanism (90) so that the fixed vertebra (70) can move to a position protruding from the cover plate (20).

10. The intervertebral disc implant prosthesis according to claim 9, characterized in that, The prosthesis body (10) has a receiving groove, which includes a first sidewall and a second sidewall arranged at an angle. The second operating part (80) is disposed on the first sidewall and includes a threaded moving block (81) and an abutting cone (82) disposed at the first end of the threaded moving block (81). The second end of the threaded moving block (81) is the operating end. The second transmission mechanism (90) includes a transmission block (91) disposed on the second sidewall. The first end of the transmission block (91) has a first [feature] that cooperates with the abutting cone (82). With the cooperation inclined surface (92), the second end of the transmission block (91) has a transmission inclined surface (93). The fixed vertebra (70) is disposed on the second side wall and includes a main body (71), a connecting vertebra (72), and a second cooperation inclined surface (73). The moving direction of the transmission block (91) and the moving direction of the main body (71) are set at an angle. The second cooperation inclined surface (73) is disposed at the first end of the main body (71) and cooperates with the transmission inclined surface (93). The connecting vertebra (72) is disposed at the second end of the main body (71).

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