Intervertebral prosthesis and intervertebral prosthesis components

Abstract

This invention provides an intervertebral disc prosthesis and an intervertebral disc prosthesis assembly. The intervertebral disc prosthesis includes: a superior endplate; a inferior endplate, with a first end of the superior endplate hinged to a first end of the inferior endplate, and the superior and inferior endplates are capable of relative oscillation; and a floating support member disposed between the superior and inferior endplates. The floating support member includes a first support plate, a second support plate, and an elastic member. The first end of the first support plate is hinged to a first end of the second support plate, and the first and second support plates are capable of relative oscillation. The first ends of the first and second support plates are located between the first ends of the superior and inferior endplates. The elastic member is disposed between the first and second support plates and applies elastic force to cause the first support plate to abut against the superior endplate, and the second support plate to abut against the inferior endplate. The technical solution of this application effectively solves the problem of poor post-implantation stability caused by the fixed angle between the superior and inferior endplates of intervertebral disc prostheses in related technologies.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more specifically, to an intervertebral disc prosthesis and an intervertebral disc prosthesis assembly. Background Technology

[0002] In the field of spinal surgery, intervertebral fusion is a common surgical procedure used to treat intervertebral disc degeneration or damage caused by spinal diseases. The aim is to restore normal spinal structure, reduce pain, and improve the patient's quality of life. One commonly used implant in intervertebral fusion is the intervertebral prosthesis, which is designed to be placed between two adjacent vertebrae to replace the damaged or removed intervertebral disc, thereby promoting bone fusion between the vertebrae.

[0003] The intervertebral disc prosthesis in the related technology is designed to mimic the function of a natural intervertebral disc. The intervertebral disc prosthesis in the related technology includes a superior endplate and a inferior endplate, which are placed between two adjacent vertebral bodies to support the intervertebral space.

[0004] However, the design of intervertebral prostheses in these technologies has certain limitations. Specifically, the angle between the superior and inferior endplates of intervertebral prostheses in these technologies is often fixed, which limits the adaptability of the prosthesis. In practical applications, due to the varying shapes and sizes of intervertebral spaces among patients, coupled with potential minor deviations during surgical procedures, a fixed angle between the superior and inferior endplates is difficult to match with individualized intervertebral space conditions. When the angle between the superior and inferior endplates does not match the intervertebral space conditions, the intervertebral prosthesis is prone to displacement or tilting when bearing spinal loads, affecting its stability. Summary of the Invention

[0005] The main objective of this invention is to provide an intervertebral prosthesis and an intervertebral prosthesis assembly to solve the problem of poor post-implantation stability caused by the fixed angle between the superior and inferior endplates of the intervertebral prosthesis in related technologies.

[0006] To achieve the above objectives, according to one aspect of the present invention, an intervertebral prosthesis is provided, comprising: a superior endplate; a inferior endplate, wherein a first end of the superior endplate is hinged to a first end of the inferior endplate, and the superior endplate and the inferior endplate are capable of relative oscillation; and a floating support member disposed between the superior endplate and the inferior endplate, the floating support member comprising a first support plate, a second support plate, and an elastic member, wherein a first end of the first support plate is hinged to a first end of the second support plate, and the first support plate and the second support plate are capable of relative oscillation; the first end of the first support plate and the first end of the second support plate are located between the first end of the superior endplate and the first end of the inferior endplate, and the elastic member is disposed between the first support plate and the second support plate and applies elastic force to cause the first support plate to abut against the superior endplate and the second support plate to abut against the inferior endplate.

[0007] Furthermore, the upper end plate includes a first frame and a first connecting plate disposed within the first frame. The surface of the first connecting plate protrudes outward from the surface of the first frame, and the first support plate abuts against the first connecting plate.

[0008] Furthermore, the first frame is provided with an installation groove, and the intervertebral prosthesis also includes a rotating ball rotatably disposed in the installation groove, the surface of the rotating ball protruding outward from the surface of the first frame.

[0009] Furthermore, the surface of the first connecting plate is flush with the surface of the rotating ball, or the surface of the first connecting plate protrudes outward from the surface of the rotating ball.

[0010] Furthermore, the rotating sphere is provided with a bone inlet groove, which is arranged around the outer surface of the rotating sphere; and / or, the rotating sphere is provided with a bone inlet hole, which penetrates the oppositely arranged surfaces of the rotating sphere.

[0011] Furthermore, the first frame forms a through hole, and the first connecting plate includes a connecting body and a stop ring. The stop ring is connected to the outer periphery of the connecting body and extends outward. The connecting body passes through the through hole, and the stop ring cooperates with the stop of the first frame.

[0012] Furthermore, the outer surface of the connecting body is provided with a plurality of first embedding protrusions and a plurality of second embedding protrusions protruding away from the floating support. Each first embedding protrusion is disposed between two adjacent second embedding protrusions. The first embedding protrusion is a single-angle protrusion, and the second embedding protrusion is a double-angle protrusion. The single-angle protrusion includes a first embedding surface and a second embedding surface connected together, and a first acute angle is formed between the first embedding surface and the second embedding surface. The double-angle protrusion includes a third embedding surface, a fourth embedding surface, and a fifth embedding surface connected in sequence. The third embedding surface is disposed opposite to the second embedding surface, and a second acute angle or a right angle is formed between the third embedding surface and the fourth embedding surface. An obtuse angle is formed between the fourth embedding surface and the fifth embedding surface. And / or, the connecting body is provided with a bone graft groove, and the intervertebral prosthesis also includes a bone growth block disposed in the bone graft groove, and the bone growth block is provided with a porous structure.

[0013] Furthermore, the intervertebral prosthesis also includes fixation pins, with pin holes provided on the first connecting plate and fixation pins passing through the pin holes; and / or, a guide limiting structure is provided between the first connecting plate and the first support plate, the guide limiting structure including a slide groove and a slider that guides and limits the slide groove, the slide groove being provided on one of the first connecting plate and the first support plate, and the slider being provided on the other of the first connecting plate and the first support plate.

[0014] Furthermore, the lower end plate includes a second frame and a second connecting plate disposed within the second frame. The surface of the second connecting plate protrudes outward from the surface of the second frame, and the second support plate abuts against the second connecting plate.

[0015] According to another aspect of the present invention, an intervertebral prosthesis assembly is provided, including an intervertebral prosthesis and an assembly tool, wherein the intervertebral prosthesis is the aforementioned intervertebral prosthesis.

[0016] Furthermore, a first socket is provided on the first frame, a second socket is provided on the second frame, and the assembly tool includes a handle and a first connecting rod and a second connecting rod spaced apart on the handle. The first connecting rod can be inserted into the first socket, and the second connecting rod can be inserted into the second socket. And / or, a third socket is provided on the first support plate, a fourth socket is provided on the second support plate, and the assembly tool includes a handle and a third connecting rod and a fourth connecting rod spaced apart on the handle. The third connecting rod can be inserted into the third socket, and the fourth connecting rod can be inserted into the fourth socket.

[0017] Furthermore, when the first support plate is provided with a third insertion hole and the second support plate is provided with a fourth insertion hole, and the assembly tool includes a handle and a third connecting rod and a fourth connecting rod spaced apart on the handle, the intervertebral prosthesis assembly also includes a fixator. The fixator is provided with a receiving cavity. When the floating support is placed in the receiving cavity, both the first support plate and the second support plate abut against the side wall of the receiving cavity, so that the third connecting rod can be inserted into the third insertion hole and the fourth connecting rod can be inserted into the fourth insertion hole.

[0018] According to the technical solution of this invention, the intervertebral prosthesis includes: a superior endplate, a inferior endplate, and a floating support. A first end of the superior endplate is hinged to a first end of the inferior endplate, and the superior and inferior endplates are capable of relative oscillation. The floating support is disposed between the superior and inferior endplates, and includes a first support plate, a second support plate, and an elastic member. A first end of the first support plate is hinged to a first end of the second support plate, and the first and second support plates are capable of relative oscillation. The first ends of the first and second support plates are located between the first ends of the superior and inferior endplates. The elastic member is disposed between the first and second support plates and applies elastic force, causing the first support plate to abut against the superior endplate and the second support plate to abut against the inferior endplate. Thus, through the hinged design between the superior and inferior endplates, the outer contour of the intervertebral prosthesis can be adjusted at an angle, thereby achieving individualized and precise matching of the intervertebral prosthesis. By incorporating floating supports, the floating supports can apply a force to the upper endplate in a direction opposite to that of the lower endplate, and a force to the lower endplate in a direction opposite to that of the upper endplate. This allows the floating supports to support both the upper and lower endplates, which in turn support the adjacent vertebrae. Furthermore, the hinged connection between the first and second support plates allows for an adjustable angle between them. This ensures a better match between the angles of the first and second support plates and the angles of the upper and lower endplates, resulting in a more even distribution of load between them. This leads to a more uniform stress distribution, reduces additional pressure on adjacent vertebrae, lowers the risk of intervertebral prosthesis loosening, and improves post-implantation stability. Therefore, the technical solution of this application effectively solves the problem of poor post-implantation stability caused by the fixed angle between the upper and lower endplates in related technologies. Attached Figure Description

[0019] 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:

[0020] Figure 1 A three-dimensional structural schematic diagram of an embodiment of an intervertebral prosthesis according to the present invention is shown;

[0021] Figure 2 It shows Figure 1 A three-dimensional structural diagram of the first and second frames of an intervertebral prosthesis;

[0022] Figure 3 It shows Figure 1 A three-dimensional structural diagram of the first and second connecting plates of the intervertebral prosthesis;

[0023] Figure 4 It shows Figure 1 A three-dimensional structural diagram of the first connecting plate of the intervertebral prosthesis;

[0024] Figure 5 It shows Figure 1 A three-dimensional structural diagram of the floating support component of an intervertebral prosthesis;

[0025] Figure 6 It shows Figure 1 A three-dimensional structural diagram of the rotating sphere of an intervertebral prosthesis;

[0026] Figure 7 It shows Figure 1 A side view of the connection body of the intervertebral prosthesis;

[0027] Figure 8 A three-dimensional structural diagram is shown of an embodiment of the intervertebral prosthesis assembly according to the present invention, showing the first connecting rod being inserted into the first socket and the second connecting rod being inserted into the second socket.

[0028] Figure 9 A three-dimensional structural schematic diagram of a floating support member of an embodiment of the intervertebral prosthesis assembly according to the present invention is shown when the floating support member is disposed within the receiving cavity.

[0029] The above figures include the following reference numerals:

[0030] 10. Upper endplate; 11. First frame; 111. Mounting groove; 112. Through hole; 113. First insertion hole; 12. First connecting plate; 121. Connecting body; 1211. Bone graft groove; 122. Stop ring; 123. First embedding protrusion; 1231. First embedding surface; 1232. Second embedding surface; 124. Second embedding protrusion; 1241. Third embedding surface; 1242. Fourth embedding surface; 1243. Fifth embedding surface; 125. Bone growth block; 126. Screw hole; 127. Slide groove;

[0031] 20. Lower end plate; 21. Second frame; 211. Second insertion hole; 22. Second connecting plate;

[0032] 30. Floating support; 31. First support plate; 311. Slider; 312. Third insertion hole; 32. Second support plate; 321. Fourth insertion hole; 33. Elastic element;

[0033] 40. Rotating ball; 41. Bone elongation groove; 42. Bone elongation through-hole;

[0034] 51. Handle; 52. First connecting rod; 53. Second connecting rod; 54. Third connecting rod; 55. Fourth connecting rod;

[0035] 60. Fixture; 61. Receiving cavity;

[0036] 71. Fixing nail. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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.

[0040] In this embodiment, as Figures 1 to 5As shown, the intervertebral prosthesis includes: a superior endplate 10, a inferior endplate 20, and a floating support 30. The first end of the superior endplate 10 is hinged to the first end of the inferior endplate 20, and the superior endplate 10 and inferior endplate 20 are capable of relative oscillation. The floating support 30 is disposed between the superior endplate 10 and the inferior endplate 20, and includes a first support plate 31, a second support plate 32, and an elastic member 33. The first end of the first support plate 31 is hinged to the first end of the second support plate 32, and the first support plate 31 and second support plate 32 are capable of relative oscillation. The first end of the first support plate 31 and the first end of the second support plate 32 are located between the first end of the superior endplate 10 and the first end of the inferior endplate 20. The elastic member 33 is disposed between the first support plate 31 and the second support plate 32 and applies elastic force, so that the first support plate 31 abuts against the superior endplate 10, and the second support plate 32 abuts against the inferior endplate 20.

[0041] Thus, the hinged design between the upper endplate 10 and the lower endplate 20 allows for angle adjustment of the outer contour of the intervertebral prosthesis, thereby achieving individualized and precise matching. The floating support 30 applies a force to the upper endplate 10 in a direction opposite to that of the lower endplate 20, and also applies a force to the lower endplate 20 in a direction opposite to that of the upper endplate 10, thus supporting both the upper and lower endplates 10 and supporting adjacent vertebrae. Furthermore, the hinged connection between the first support plate 31 and the second support plate 32 allows for an adjustable angle between them. This enables the angle between the first support plate 31 and the second support plate 32 to better match the angle between the upper endplate 10 and the lower endplate 20. Consequently, the first support plate 31 and the second support plate 32 can more evenly distribute the load between the upper endplate 10 and the lower endplate 20, resulting in a more uniform stress distribution. This reduces additional pressure on adjacent vertebral bodies, lowers the risk of intervertebral prosthesis loosening, and improves post-implantation stability. Therefore, the technical solution of this embodiment effectively solves the problem of poor post-implantation stability caused by the fixed angle between the upper and lower endplates of the intervertebral prosthesis in related technologies.

[0042] In this embodiment, the elastic element 33 applies a force to the first support plate 31 in a direction opposite to that of the second support plate 32, and the elastic element 33 also applies a force to the second support plate 32 in a direction opposite to that of the first support plate 31. The elastic element 33 is a spring. The first support plate 31, the second support plate 32, and the elastic element 33 are made of materials such as titanium alloy and have undergone anodizing treatment.

[0043] In other embodiments, the elastic element 33 is an elastic polymer material, such as rubber.

[0044] like Figures 1 to 4As shown, the upper endplate 10 includes a first frame 11 and a first connecting plate 12 disposed within the first frame 11. The surface of the first connecting plate 12 protrudes outward from the surface of the first frame 11, and the first support plate 31 abuts against the first connecting plate 12. Thus, when implanting an intervertebral prosthesis between two adjacent vertebrae, the first frame 11 and the second frame 21 can be implanted first, followed by the placement of the first connecting plate 12 within the first frame 11. This arrangement reduces the thickness of the first frame 11 and the second frame 21 during implantation, thereby reducing damage to the vertebrae and making implantation smoother. Furthermore, the outward protrusion of the first connecting plate 12 from the surface of the first frame 11 increases the overall thickness of the intervertebral prosthesis, reducing the possibility of loosening after implantation, facilitating the maintenance of intervertebral disc height, and preventing damage to the vertebrae during implantation. It also makes the connection between the intervertebral prosthesis and the two adjacent vertebrae more reliable, with a larger contact area, resulting in more reliable support from the intervertebral prosthesis for the two adjacent vertebrae.

[0045] The inventors discovered that in related technologies, the height of the intervertebral prosthesis is approximately equal to the height of the intervertebral space. During implantation, external force is usually required to insert the prosthesis into the corresponding spinal segment, which can easily damage the vertebral body. However, by using the above-described embodiment, the first frame 11 and the first connecting plate 12 reduce damage to the vertebral body.

[0046] like Figure 1 , Figure 2 as well as Figure 6 As shown, the first frame 11 is provided with an installation groove 111, and the intervertebral prosthesis also includes a rotating ball 40 rotatably disposed within the installation groove 111. The surface of the rotating ball 40 protrudes outward from the surface of the first frame 11. The rotating ball 40 further reduces the damage caused when the first frame 11 and the second frame 21 are implanted between two adjacent vertebrae. Specifically, because the surface of the rotating ball 40 protrudes outward from the surface of the first frame 11, when the first frame 11 and the second frame 21 are implanted between two adjacent vertebrae, the vertebrae can contact the surface of the rotating ball 40, reducing the contact area and thus reducing damage to the vertebrae. Furthermore, since the rotating ball 40 is rotatably disposed within the installation groove 111, it can rotate when in contact with the vertebrae. The rolling of the rotating ball 40 reduces relative friction, further reducing the possibility of damage to the vertebrae.

[0047] In this embodiment, the rotating ball 40 is a sphere, and the cross-sectional shape of the mounting groove 111 is larger than half the size of the sphere. The first frame 11 is formed by layering and welding to facilitate the placement of the rotating ball 40 within the mounting groove 111.

[0048] like Figure 1 and Figure 2As shown, the surface of the first connecting plate 12 protrudes outward from the surface of the rotating ball 40. In this way, when the first connecting plate 12 is implanted between two adjacent vertebrae, the surface of the first connecting plate 12 can make closer contact with the vertebrae, which facilitates the support of the first connecting plate 12 for the vertebrae, so that the connection between the intervertebral prosthesis and the two adjacent vertebrae is more stable and reliable.

[0049] In other embodiments, the surface of the first connecting plate 12 is flush with the surface of the rotating ball 40.

[0050] like Figure 6 As shown, the rotating sphere 40 is provided with a bone ingrowth groove 41, which surrounds the outer surface of the rotating sphere 40. The rotating sphere 40 is also provided with a bone ingrowth hole 42, which penetrates the oppositely positioned surfaces of the rotating sphere 40. The design of the bone ingrowth groove 41 and the bone ingrowth hole 42 on the surface of the rotating sphere 40 increases the total surface area of ​​the rotating sphere 40, promotes the bone ingrowth process, improves the biomechanical performance of the intervertebral prosthesis after implantation, and enhances the long-term stability and load-bearing capacity of the intervertebral prosthesis. The bone ingrowth groove 41 helps to increase the surface roughness of the rotating sphere 40, improves hydrophilicity, and facilitates the growth and adhesion of bone cells on its surface. The bone ingrowth hole 42 increases the surface area of ​​the rotating sphere 40, which is conducive to promoting the inward ingrowth of bone tissue.

[0051] In other embodiments, the rotating sphere 40 is provided with a bone insertion groove 41, which surrounds the outer surface of the rotating sphere 40. Alternatively, the rotating sphere 40 is provided with a bone insertion hole 42, which penetrates the opposite surfaces of the rotating sphere 40.

[0052] like Figures 1 to 4 As shown, the first frame 11 forms a through hole 112. The first connecting plate 12 includes a connecting body 121 and a stop ring 122. The stop ring 122 is connected to the outer periphery of the connecting body 121 and extends outward. The connecting body 121 passes through the through hole 112, and the stop ring 122 engages with the first frame 11. The engagement between the through hole 112 formed by the first frame 11 and the stop ring 122 of the first connecting plate 12 not only strengthens the structure of the upper end plate 10, but also increases the positioning accuracy and connection reliability of the first frame 11 and the first connecting plate 12 through the embedded design, allowing the first connecting plate 12 to be more reliably installed within the first frame 11. The above-mentioned structure is simple and compact, easy to manufacture, and has good structural strength.

[0053] like Figure 7As shown, the outer surface of the connecting body 121 is provided with a plurality of first embedding protrusions 123 and a plurality of second embedding protrusions 124 protruding away from the floating support 30. Each first embedding protrusion 123 is disposed between two adjacent second embedding protrusions 124. The first embedding protrusion 123 is a single-angle protrusion, and the second embedding protrusion 124 is a double-angle protrusion. The single-angle protrusion includes a first embedding surface 1231 and a second embedding surface 1232 connected together, forming a first acute angle between the first embedding surface 1231 and the second embedding surface 1232. The double-angle protrusion includes a third embedding surface 1241, a fourth embedding surface 1242 and a fifth embedding surface 1243 connected in sequence. The third embedding surface 1241 is disposed opposite to the second embedding surface 1232, forming a second acute angle or a right angle between the third embedding surface 1241 and the fourth embedding surface 1242, and forming an obtuse angle between the fourth embedding surface 1242 and the fifth embedding surface 1243. The design of multiple first embedding protrusions 123 and multiple second embedding protrusions 124 on the first connecting plate 12, through the combination of single-angle and double-angle protrusions, provides an alternating contact surface, enabling better embedding into the vertebral body and ensuring that the load transmitted in any direction is evenly distributed, reducing the risk of local overload. Furthermore, the aforementioned first acute angle, second acute angle, right angle, and obtuse angle settings allow the first embedding protrusions 123 and second embedding protrusions 124 to act as stoppers in multiple directions after embedding into the vertebral body, reducing the possibility of the connecting body 121 moving in multiple directions, thereby making the connection between the connecting body 121 and the vertebral body more reliable and stable. The connecting body 121 is provided with a bone graft groove 1211, and the intervertebral prosthesis also includes a bone growth block 125 disposed within the bone graft groove 1211, the bone growth block 125 having a porous structure. The bone graft groove 1211 can be filled with autologous bone, allogeneic bone, and other bone filling materials. Furthermore, by placing the porous bone growth block 125 within the bone graft groove 1211, bone ingrowth along the inner and outer directions of the bone growth block 125 is achieved, further enhancing biocompatibility and promoting bone tissue growth, thereby further improving the stability of the intervertebral prosthesis after implantation. In this embodiment, autologous bone, allogeneic bone, other bone filling materials, and the bone growth block 125 are all located within the bone graft groove 1211, with the autologous bone, allogeneic bone, and other bone filling materials located on the side of the bone growth block 125 facing the floating support 30.

[0054] In this embodiment, the surface of the bone growth block 125 away from the floating support 30 is also provided with a plurality of primary embedding protrusions and a plurality of secondary embedding protrusions 124. The bone growth block 125 has a porous structure resembling bone trabeculae and is manufactured by 3D printing from biodegradable materials such as magnesium alloy. The use of biodegradable materials is beneficial for promoting osteogenesis. The plurality of primary embedding protrusions and the plurality of secondary embedding protrusions 124 are all treated with HA spraying, and the plurality of primary embedding protrusions and the plurality of secondary embedding protrusions 124 have a porous structure to facilitate bone ingrowth. The connecting body 121 is provided with a porous structure resembling bone trabeculae. The connecting body 121 and the stop protrusion 122 are manufactured by 3D printing from materials such as titanium alloy and tantalum metal and are treated with anodizing.

[0055] In other embodiments, the outer surface of the connecting body 121 is provided with a plurality of first embedding protrusions 123 and a plurality of second embedding protrusions 124 protruding away from the floating support 30. Each first embedding protrusion 123 is disposed between two adjacent second embedding protrusions 124. The first embedding protrusion 123 is a single-angle protrusion, and the second embedding protrusion 124 is a double-angle protrusion. The single-angle protrusion includes a first embedding surface 1231 and a second embedding surface 1232 connected together, forming a first acute angle between the first embedding surface 1231 and the second embedding surface 1232. The double-angle protrusion includes a third embedding surface 1241, a fourth embedding surface 1242 and a fifth embedding surface 1243 connected in sequence. The third embedding surface 1241 is disposed opposite to the second embedding surface 1232, forming a second acute angle or a right angle between the third embedding surface 1241 and the fourth embedding surface 1242, and forming an obtuse angle between the fourth embedding surface 1242 and the fifth embedding surface 1243. Alternatively, the connecting body 121 may be provided with a bone graft groove 1211, and the intervertebral prosthesis may also include a bone growth block 125 disposed in the bone graft groove 1211, the bone growth block 125 having a porous structure.

[0056] like Figure 3 and Figure 4As shown, the intervertebral prosthesis also includes fixation screws 71. The first connecting plate 12 has screw holes 126, and the fixation screws 71 pass through these holes. The engagement of the fixation screws 71 with the screw holes 126 on the first connecting plate 12 achieves a secure connection between the first connecting plate 12 and the vertebral body, allowing the first frame 11 to also connect to the vertebral body, thus ensuring the overall fixation of the upper endplate 10 to the vertebral body. Furthermore, during the screwing of the fixation screws 71 into the vertebral body, the fixation screws 71 can cause the upper endplate 10 to swing relative to the lower endplate 20, thereby adjusting the angle of the intervertebral prosthesis and enabling it to match the human vertebral endplate, reducing the number of prostheses required during surgery. The use of fixation screws 71 and screw holes 126 eliminates the need for other instruments such as pins and fixation plates, reducing damage to the human vertebral body. A guide and limiting structure is provided between the first connecting plate 12 and the first support plate 31. The guide and limiting structure includes a slide groove 127 and a slider 311 that guides and limits the movement of the slide groove 127. The slide groove 127 is disposed on the first connecting plate 12, and the slider 311 is disposed on the first support plate 31. Furthermore, the guide and limiting structure allows for alignment between the first connecting plate 12 and the first support plate 31, preventing misalignment after insertion. Additionally, the guide and limiting structure also guides the insertion of the first support plate 31 between the first connecting plate 12 and the second connecting plate 22, making the assembly process smoother.

[0057] In this embodiment, the fixing nail 71 is made of materials such as titanium alloy and undergoes anodizing treatment.

[0058] In other embodiments, the intervertebral prosthesis further includes a fixation nail 71, with a nail hole 126 provided on the first connecting plate 12, and the fixation nail 71 passing through the nail hole 126. Alternatively, a guide and limiting structure is provided between the first connecting plate 12 and the first support plate 31. The guide and limiting structure includes a groove 127 and a slider 311 that guides and limits the movement of the groove 127. The groove 127 is provided on one of the first connecting plate 12 and the first support plate 31, and the slider 311 is provided on the other of the first connecting plate 12 and the first support plate 31.

[0059] In other embodiments, the slide 127 is disposed on the first support plate 31, and the slider 311 is disposed on the first connecting plate 12.

[0060] like Figures 1 to 3As shown, the lower endplate 20 includes a second frame 21 and a second connecting plate 22 disposed within the second frame 21. The surface of the second connecting plate 22 protrudes outward from the surface of the second frame 21, and the second support plate 32 abuts against the second connecting plate 22. Thus, when implanting the intervertebral prosthesis between two adjacent vertebrae, the first frame 11 and the second frame 21 can be implanted first, and then the second connecting plate 22 can be placed inside the second frame 21. This arrangement reduces the thickness of the first frame 11 and the second frame 21 during implantation, thereby reducing damage to the vertebrae and making implantation smoother. Furthermore, the outward protrusion of the second connecting plate 22 from the surface of the second frame 21 increases the overall thickness of the intervertebral prosthesis, preventing damage to the vertebrae during implantation. It also makes the connection between the intervertebral prosthesis and the two adjacent vertebrae more reliable, with a larger contact area, resulting in more reliable support from the intervertebral prosthesis for the two adjacent vertebrae.

[0061] In this embodiment, the structure of the lower end plate 20 is configured accordingly based on the structure of the upper end plate 10.

[0062] The inventors discovered that in related technologies, the endplate of the intervertebral prosthesis contacts the cortical bone region of the vertebral endplate. Because cortical bone is a mineralized structure and lacks osteocytes that promote bone growth, it affects the bone ingrowth of the prosthesis. This can lead to loosening of the intervertebral prosthesis after implantation, affecting fusion. The intervertebral prostheses in these technologies are made of titanium alloy and PEEK. Since these materials are bioinert, they cannot promote bone tissue growth or form good biocompatible bone integration with human bone tissue. The release of metal ions can also pose a threat to the safety and effectiveness of the prosthesis, easily causing bacterial infection and affecting clinical application outcomes.

[0063] In this embodiment, the first frame 11 and the second frame 21 are manufactured from medical materials such as titanium alloy and tantalum metal through traditional casting, machining, or 3D printing, and then anodized. The rotating ball 40 is made of biodegradable materials such as magnesium alloy. Both the first connecting plate 12 and the second connecting plate 22 are anodized, which improves corrosion resistance. Anodizing also introduces elements with bioactivity and antibacterial functions, such as Ca, P, Zn, Mn, Ag, and Sr, thereby improving bone ingrowth and antibacterial capabilities. The intervertebral prosthesis in this embodiment has good bioactivity. The surfaces of the upper endplate 10 and the lower endplate 20 are designed with structures made of biodegradable materials to promote bone fusion. The intervertebral prosthesis also undergoes surface modification treatment to improve its corrosion resistance and enhance safety.

[0064] like Figure 8 and Figure 9As shown, this application also provides an intervertebral prosthesis assembly, which includes an intervertebral prosthesis and an assembly tool, wherein the intervertebral prosthesis is the aforementioned intervertebral prosthesis. Because the aforementioned intervertebral prosthesis can solve the problem of poor post-implantation stability caused by the fixed angle between the superior and inferior endplates of the intervertebral prosthesis in related technologies, the intervertebral prosthesis assembly with this prosthesis can solve the same technical problem.

[0065] like Figures 1 to 9 As shown, the first frame 11 is provided with a first insertion hole 113, and the second frame 21 is provided with a second insertion hole 211. The assembly tool includes a handle 51 and a first connecting rod 52 and a second connecting rod 53 spaced apart on the handle 51. The first connecting rod 52 can be inserted into the first insertion hole 113, and the second connecting rod 53 can be inserted into the second insertion hole 211. Through the cooperation of the first connecting rod 52 and the second connecting rod 53 on the assembly tool with the first insertion hole 113 and the second insertion hole 211, the assembly tool can fix the first frame 11 and the second frame 21, thereby facilitating the implantation operation of the first frame 11 and the second frame 21 and improving the implantation accuracy. The first support plate 31 has a third insertion hole 312, and the second support plate 32 has a fourth insertion hole 321. The assembly tool includes a handle 51 and a third connecting rod 54 and a fourth connecting rod 55 spaced apart on the handle 51. The third connecting rod 54 can be inserted into the third insertion hole 312, and the fourth connecting rod 55 can be inserted into the fourth insertion hole 321. Through the engagement of the third connecting rod 54 and the fourth connecting rod 55 with the third insertion hole 312 and the fourth insertion hole 321, the assembly tool can fix the first support plate 31 and the second support plate 32, facilitating the implantation of the support plates and improving implantation accuracy. Furthermore, the above arrangement also facilitates the docking operation of the guide and limiting structure's slide groove 127 and the slider 311.

[0066] In other embodiments, a first socket 113 is provided on the first frame 11, and a second socket 211 is provided on the second frame 21. The assembly tool includes a handle 51 and a first connecting rod 52 and a second connecting rod 53 spaced apart on the handle 51. The first connecting rod 52 can be inserted into the first socket 113, and the second connecting rod 53 can be inserted into the second socket 211. Alternatively, a third socket 312 is provided on the first support plate 31, and a fourth socket 321 is provided on the second support plate 32. The assembly tool includes a handle 51 and a third connecting rod 54 and a fourth connecting rod 55 spaced apart on the handle 51. The third connecting rod 54 can be inserted into the third socket 312, and the fourth connecting rod 55 can be inserted into the fourth socket 321.

[0067] like Figures 1 to 9As shown, when the first support plate 31 is provided with a third insertion hole 312, the second support plate 32 is provided with a fourth insertion hole 321, and the assembly tool includes a handle 51 and a third connecting rod 54 and a fourth connecting rod 55 spaced apart on the handle 51, the intervertebral prosthesis assembly also includes a fixator 60. The fixator 60 has a receiving cavity 61. When the floating support 30 is placed in the receiving cavity 61, both the first support plate 31 and the second support plate 32 abut against the side wall of the receiving cavity 61, so that the third connecting rod 54 can be inserted into the third insertion hole 312 and the fourth connecting rod 55 can be inserted into the fourth insertion hole 321. The use of the fixator 60 provides positioning and support for the floating support 30 during the pre-assembly stage. The receiving cavity 61 within the fixator 60 not only protects the integrity of the floating support 30 during transplantation but also, through the contact between its sidewalls and the first and second support plates 31 and 32, pre-compresses the elastic element 33 of the floating support 30. This ensures that the first and second support plates 31 and 32 are in preset positions, facilitating the insertion and engagement of the third connecting rod 54 with the third insertion hole 312 and the fourth connecting rod 55 with the fourth insertion hole 321. This optimized assembly strategy of pre-compression and pre-positioning reduces uncertainties during implantation, shortens assembly time, and improves the initial stability of the intervertebral prosthesis after implantation.

[0068] In this embodiment, the first connecting rod 52, the second connecting rod 53, the third connecting rod 54, and the fourth connecting rod 55 are all detachably mounted on the handle 51.

[0069] 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.

[0070] 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 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0071] 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.

[0072] 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 prosthesis, characterized in that, include: Top end plate (10); The lower end plate (20) is hinged to the first end of the upper end plate (10), and the upper end plate (10) and the lower end plate (20) are able to swing relative to each other. A floating support (30) is disposed between the upper end plate (10) and the lower end plate (20). The floating support (30) includes a first support plate (31), a second support plate (32), and an elastic member (33). The first end of the first support plate (31) is hinged to the first end of the second support plate (32), and the first support plate (31) and the second support plate (32) can swing relative to each other. The first end of the first support plate (31) and the first end of the second support plate (32) are located between the first end of the upper end plate (10) and the first end of the lower end plate (20). The elastic member (33) is disposed between the first support plate (31) and the second support plate (32) and applies elastic force so that the first support plate (31) abuts against the upper end plate (10), and the second support plate (32) abuts against the lower end plate (20). The upper endplate (10) includes a first frame (11) and a first connecting plate (12) disposed within the first frame (11). The surface of the first connecting plate (12) protrudes outward from the surface of the first frame (11), and the first support plate (31) abuts against the first connecting plate (12). The first frame (11) is provided with an installation groove (111), and the intervertebral prosthesis also includes a rotating ball (40) rotatably disposed within the installation groove (111). The surface of the rotating ball (40) protrudes outward from the surface of the first frame (11).

2. The intervertebral prosthesis according to claim 1, characterized in that, The surface of the first connecting plate (12) is flush with the surface of the rotating ball (40), or the surface of the first connecting plate (12) protrudes outward from the surface of the rotating ball (40).

3. The intervertebral prosthesis according to claim 1, characterized in that, The rotating ball (40) is provided with a bone inlet groove (41), which surrounds the outer surface of the rotating ball (40); and / or, the rotating ball (40) is provided with a bone inlet hole (42), which penetrates the opposite surfaces of the rotating ball (40).

4. The intervertebral prosthesis according to claim 1, characterized in that, The first frame (11) forms a through hole (112). The first connecting plate (12) includes a connecting body (121) and a stop ring (122). The stop ring (122) is connected to the outer periphery of the connecting body (121) and extends outward. The connecting body (121) passes through the through hole (112). The stop ring (122) is in stop cooperation with the first frame (11).

5. The intervertebral prosthesis according to claim 4, characterized in that, The outer surface of the connecting body (121) is provided with a plurality of first embedding protrusions (123) and a plurality of second embedding protrusions (124) protruding away from the floating support (30). Each first embedding protrusion (123) is disposed between two adjacent second embedding protrusions (124). The first embedding protrusion (123) is a single-angle protrusion, and the second embedding protrusion (124) is a double-angle protrusion. The single-angle protrusion includes a first embedding surface (1231) and a second embedding surface (1232) connected to each other. 31) and the second embedding surface (1232) form a first acute angle, the double-angle protrusion includes a third embedding surface (1241), a fourth embedding surface (1242) and a fifth embedding surface (1243) connected in sequence, the third embedding surface (1241) is disposed opposite to the second embedding surface (1232), the third embedding surface (1241) and the fourth embedding surface (1242) form a second acute angle or a right angle, the fourth embedding surface (1242) and the fifth embedding surface (1243) form an obtuse angle; and / or, The connecting body (121) is provided with a bone graft groove (1211), and the intervertebral prosthesis also includes a bone growth block (125) disposed in the bone graft groove (1211), and the bone growth block (125) is provided with a porous structure.

6. The intervertebral prosthesis according to claim 1, characterized in that, The intervertebral prosthesis also includes fixation screws (71), and the first connecting plate (12) is provided with screw holes (126), and the fixation screws (71) pass through the screw holes (126); and / or, A guide limiting structure is provided between the first connecting plate (12) and the first support plate (31). The guide limiting structure includes a slide groove (127) and a slider (311) that guides and limits the slide groove (127). The slide groove (127) is provided on one of the first connecting plate (12) and the first support plate (31), and the slider (311) is provided on the other of the first connecting plate (12) and the first support plate (31).

7. The intervertebral prosthesis according to claim 1, characterized in that, The lower end plate (20) includes a second frame (21) and a second connecting plate (22) disposed in the second frame (21). The surface of the second connecting plate (22) protrudes outward from the surface of the second frame (21), and the second support plate (32) abuts against the second connecting plate (22).

8. A lumbar intervertebral prosthesis assembly, comprising an intervertebral prosthesis and an assembly tool, characterized in that, The intervertebral prosthesis is the intervertebral prosthesis as described in claim 7.

9. The intervertebral prosthesis assembly according to claim 8, characterized in that, The first frame (11) is provided with a first insertion hole (113), and the second frame (21) is provided with a second insertion hole (211). The assembly tool includes a handle (51) and a first connecting rod (52) and a second connecting rod (53) spaced apart on the handle (51). The first connecting rod (52) can be inserted into the first insertion hole (113), and the second connecting rod (53) can be inserted into the second insertion hole (211); and / or, The first support plate (31) is provided with a third insertion hole (312), and the second support plate (32) is provided with a fourth insertion hole (321). The assembly tool includes a handle (51) and a third connecting rod (54) and a fourth connecting rod (55) spaced apart on the handle (51). The third connecting rod (54) can be inserted into the third insertion hole (312), and the fourth connecting rod (55) can be inserted into the fourth insertion hole (321).

10. The intervertebral prosthesis assembly according to claim 9, characterized in that, When the first support plate (31) is provided with a third insertion hole (312) and the second support plate (32) is provided with a fourth insertion hole (321), and the assembly tool includes a handle (51) and a third connecting rod (54) and a fourth connecting rod (55) spaced apart on the handle (51), the intervertebral prosthesis assembly also includes a fixator (60), the fixator (60) is provided with a receiving cavity (61), and the floating support (30) is provided in the receiving cavity (61). When the first support plate (31) and the second support plate (32) are both in contact with the side wall of the receiving cavity (61), so that the third connecting rod (54) can be inserted into the third insertion hole (312) and the fourth connecting rod (55) can be inserted into the fourth insertion hole (321).

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