Tibial plateau support and knee joint prosthesis using the same

Abstract

The present invention relates to the technical field of medical prostheses, and discloses a tibial plateau support and a knee joint prosthesis using the same. The tibial plateau support comprises: a platform support support portion, the platform support support portion comprises a top surface for connecting to a pad of a knee joint prosthesis and a bottom surface opposite to the top surface and for fitting with an osteotomy plane of a human tibia; and a platform support connection portion, one end of the platform support connection portion is fixedly connected to the bottom surface, and the other end is used to be implanted into the medullary cavity of a human tibia to be connected to the human tibia. The cross-sectional structure of the bottom surface is the same as the osteotomy plane of a human tibia. The tibial plateau support according to the present invention is more stable after implantation.

Description

Technical Field

[0001] The invention belongs to the technical field of medical prostheses, and in particular relates to a tibial plateau support and a knee joint prosthesis using the same. Background Art

[0002] A knee prosthesis is a surgical implant used to replace the knee joint. It is used in surface knee replacement surgery to treat the damaged knee joint and replace it with a knee prosthesis. Existing knee prostheses mainly include: a femoral prosthesis connected to the femur of the human body, a tibial plateau tray connected to the tibia of the human body, and a pad located between the femoral prosthesis and the tibial plateau tray.

[0003] At present, knee prostheses are widely used in joint replacement surgeries. However, in order to meet the needs of most patients for knee replacement surgeries, the existing knee prostheses often design the tibial plateau support as a symmetrical structure. The tibial plateau support of this symmetrical structure cannot completely match the natural contour of the patient's tibia, resulting in the tibial plateau support being unable to completely cover the osteotomy plane of the tibia to achieve an ideal bone coverage area. This not only reduces the stability of the tibial plateau support after implantation, thereby increasing the risk of long-term loosening of the knee prosthesis, but also stimulates the soft tissue around the connection between the tibial plateau support and the osteotomy plane during long-term use, causing pain, thereby increasing the risk of intra-articular bleeding.

[0004] In view of the shortcomings of the existing technology, technicians in this field are in urgent need of seeking a tibial plateau tray that is more stable after implantation to make up for the shortcomings of the existing technology. Summary of the invention

[0005] The invention provides a tibial plateau tray, which is more stable after implantation.

[0006] The tibial plateau support according to the present invention comprises: a plateau support support portion, the plateau support support portion comprising a top surface for connecting with a pad of a knee joint prosthesis and a bottom surface opposite to the top surface and for fitting with an osteotomy plane of a human tibia; and a plateau support connection portion, one end of the plateau support connection portion being fixedly connected with the bottom surface and the other end being implanted into the medullary cavity of a human tibia to be connected with the human tibia. The fitting surface of the bottom surface is constructed to be the same as the osteotomy plane of the human tibia.

[0007] Furthermore, the bottom surface includes an inner portion close to the inner side of the human body and an outer portion connected to the inner portion and close to the outer side of the human body, and the fitting surface area of ​​the inner portion is larger than the fitting surface area of ​​the outer portion.

[0008] Furthermore, the platform support portion further includes at least one protrusion formed on the bottom surface.

[0009] Furthermore, the protrusion includes two plate-like protrusions that are vertically connected to the bottom surface and are spaced apart from each other, and the planes where the two plate-like protrusions are located form an angle.

[0010] Furthermore, the platform support connection portion includes a columnar handle fixedly connected vertically to the bottom surface, two plate-like protrusions are respectively located on both sides of the columnar handle, and rib structures are respectively formed on the opposite sides of the outer wall of the columnar handle, and the rib structures extend from the outer wall of the columnar handle to connect with the bottom surface.

[0011] Furthermore, the angle between the plane where any plate-like protrusion is located and the plane where the rib structure close to it is located ranges from 30° to 90°.

[0012] Furthermore, a first hole is formed in the columnar shank and is coaxially arranged along the axis of the columnar shank and is connected to the top of the columnar shank, a threaded hole is connected to the first hole, and a second hole is connected to the threaded hole and the bottom of the columnar shank at the same time. A through hole is formed on the platform support portion and passes through the platform support portion and is coaxially connected to the first hole.

[0013] Furthermore, the tibial plateau tray also includes a medullary pin prosthesis detachably connected to the second hole through the threaded hole.

[0014] Furthermore, the tibial plateau support also includes an anti-rotation block detachably connected to the first hole, the anti-rotation block includes a first connecting column coaxially arranged inside the first hole, a second connecting column connected to the first connecting column and located outside the first hole, and a first mounting hole extending from the end of the first connecting column to the end of the second connecting column and coaxially connected to the threaded hole, wherein the fitting surface of the second connecting column is constructed as a polygon.

[0015] The present invention also provides a knee joint prosthesis, comprising the above-mentioned tibial plateau support and a liner fixedly connected to the tibial plateau support, wherein a second mounting hole is formed on the liner.

[0016] Compared with the prior art, the tibial plateau support of the present invention has the following advantages:

[0017] 1) The tibial plateau tray of the present invention can make the soft tissue around the tibia better fit the side contour surface of the tibial plateau tray, thereby effectively avoiding the problem of the tibial plateau tray stimulating the surrounding soft tissue at the connection between the tibial plateau tray and the osteotomy plane after implantation and causing pain, thereby effectively avoiding the risk of increasing intra-articular bleeding;

[0018] 2) The tibial plateau tray of the present invention completely covers the osteotomy plane, which can facilitate better fusion of bone tissue with the tibial plateau tray, thereby effectively improving the stability of the tibial plateau tray after implantation, thereby reducing the risk of long-term loosening of the tibial plateau tray;

[0019] 3) The tibial plateau tray of the present invention completely covers the osteotomy plane and can also enable the patient to better adapt to the implanted tibial plateau tray to enhance the kinematic characteristics of the knee joint;

[0020] 4) The tibial plateau support of the present invention can also effectively limit the rotation direction of the pad that cooperates with it by providing an anti-rotation block, so that it can effectively reduce the incidence of micro-motion of the pad and reduce the wear between the pad and the tibial plateau support. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0022] Figure 1 A front view showing the structure of the tibial plateau tray of the present invention;

[0023] Figure 2 for Figure 1 A cross-sectional view of the tibial plateau tray along the AA direction;

[0024] Figure 3 for Figure 1 A top view of the tibial plateau tray is shown;

[0025] Figure 4 for Figure 1 A bottom view of the tibial plateau tray is shown;

[0026] Figure 5 is a front view of the structure of a knee joint prosthesis according to the present invention, wherein Figure 1 The schematic diagram of the assembly of the tibial plateau support and the liner shown;

[0027] Figure 6 for Figure 5 A cross-sectional view of the knee joint prosthesis shown along the BB direction;

[0028] Figure 7 for Figure 5 Schematic diagram of the assembly of the knee joint prosthesis and the medullary pin prosthesis shown. DETAILED DESCRIPTION

[0029] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0030] Figures 1 to 4The structure of the tibial plateau support 100 according to the present invention is shown. Figures 1 to 4 As shown, the tibial plateau support 100 comprises: a plateau support support portion 1, the plateau support support portion 1 comprises a top surface 11 for connecting with the pad of the knee joint prosthesis and a bottom surface 12 opposite to the top surface 11 and for fitting with the osteotomy plane of the human tibia; and a plateau support connection portion 2, one end of the plateau support connection portion 2 is fixedly connected with the bottom surface 12, and the other end is used to be implanted in the medullary cavity of the human tibia to connect with the human tibia. The fitting surface of the bottom surface 12 is constructed to be the same as the osteotomy plane of the human tibia.

[0031] When the tibial plateau support 100 of the present invention is used, the support connecting portion 2 is implanted into the medullary cavity of the human tibia so that the tibial plateau support 100 is connected to the human tibia, and at the same time, the bottom surface 12 of the support supporting portion 1 is fitted with the osteotomy plane of the human tibia so that the bottom surface 12 covers the osteotomy plane. The tibial plateau support 100 of the present invention constructs the fitting surface of the bottom surface 12 to be the same as the osteotomy plane so that the bottom surface 12 can completely cover the osteotomy plane. Through this arrangement, on the one hand, the soft tissue around the tibia can better fit the side contour surface 13 (such as the connecting top surface 11 and the bottom surface 12) of the tibial plateau support 100. Figure 1 or Figure 3 As shown), in this way, the influence of the tibial plateau support 100 on the surrounding soft tissues and other tissues can be effectively reduced, thereby effectively avoiding the problem that the tibial plateau support 100 stimulates the surrounding soft tissues at the connection between it and the osteotomy plane after implantation and causes pain, thereby effectively avoiding the risk of increasing intra-articular bleeding; on the other hand, completely covering the osteotomy plane increases the coverage rate of the bottom surface 12 and the osteotomy plane, which can be beneficial to better fusion of bone tissue with the tibial plateau support 100, thereby effectively improving the stability of the tibial plateau support 100 after implantation, thereby reducing the risk of loosening of the tibial plateau support 100 in the long term; in addition, the tibial plateau support 100 that completely covers the osteotomy plane can also enable the patient to better adapt to the implanted tibial plateau support 100 to enhance the kinematic characteristics of the knee joint.

[0032] It should be noted that the osteotomy covering surface of the tibial plateau support 100 of the present invention can be the fitting surface of the bottom surface 12 mentioned above, or can be the osteotomy covering surface surrounded by the side contour surface 13 of the tibial plateau support 100 (such as Figure 1 or Figure 3 When the osteotomy coverage surface is defined as the osteotomy coverage surface surrounded by the side contour surface 13, the side contour surface 13 may be the same as the outer contour surface of the tibia, that is, the side contour surface 13 may replace the outer contour surface of the osteotomy site of the tibia. Preferably, the side contour surface 13 may be formed by a smooth transition connection of arc-shaped surfaces of different curvatures.

[0033] In such Figure 4In the preferred embodiment shown, the bottom surface 12 may include an inner portion 122 close to the inner side of the human body and an outer portion 121 connected to the inner portion 122 and close to the outer side of the human body, and the fitting surface area of ​​the inner portion 122 is greater than the fitting surface area of ​​the outer portion 121. It should be noted that the inner portion 122 close to the inner side of the human body and the outer portion 121 close to the outer side of the human body can be understood as: Figure 4 The left and right sides of the center line C shown are the lateral part 121 for covering the lateral condyle of the osteotomy plane of the tibia and the medial part 122 for covering the medial condyle of the osteotomy plane of the tibia. The bottom surface 12 formed by the medial part 122 and the lateral part 121 is formed into an asymmetric fitting surface. The center line C here can be defined as: when the tibial plateau support 100 is connected to the osteotomy plane of the tibia, when observed along the anatomical plane perpendicular to the tibia (i.e., the top view direction of the tibia), the line connecting the center point of the osteotomy plane of the tibia and parallel to the anterior-posterior direction of the human body; or defined as the line of the osteotomy plane of the tibia, which is used to separate the medial condyle and the lateral condyle of the osteotomy plane of the tibia and is parallel to the anterior-posterior direction of the human body.

[0034] Through the above-mentioned arrangement, on the one hand, the bottom surface 12 is formed as an asymmetric fitting surface which can conform to the physiological shape of the osteotomy plane of the tibia, so that it can more widely adapt to the osteotomy plane of the tibia of most patients, thereby further improving the coverage area of ​​the tibial plateau support 100 for the tibial osteotomy plane of most patients; on the other hand, the asymmetric bottom surface 12 can also play a role in spatial orientation, that is, when the tibial plateau support 100 is implanted, the position of the tibial plateau support 100 relative to the osteotomy plane can be quickly adjusted through the asymmetric bottom surface 12, so that it can completely cover the osteotomy plane of the tibia, so as to improve its fixation stability, while also improving the efficiency of the operation.

[0035] In such Figure 4 In the preferred embodiment shown, the platform support portion 1 may further include at least one protrusion 14 formed on the bottom surface 12. Through this arrangement, on the one hand, the outer surface of the protrusion 14 can further increase the area of ​​the bottom surface 12 to further improve the fit between the bottom surface 12 and the osteotomy plane, so that the platform support prosthesis 100 can have a better coverage effect with the osteotomy plane; on the other hand, the area of ​​the bottom surface 12 increased by the outer surface of the protrusion 14 can not only ensure better fusion of the bone and the bottom surface 12, but also improve the strength of the platform support portion 1, so as to effectively improve the stability of the platform support prosthesis 100 after implantation into the tibia.

[0036] Preferably, if Figure 4As shown, the protrusion 14 may include two spaced plate-like protrusions 141 vertically connected to the bottom surface 12, and the planes where the two plate-like protrusions 141 are located are at an angle. Through this arrangement, after the platform support prosthesis 100 is connected to the tibia, the two plate-like protrusions 141 arranged at an angle can cause the platform support support portion 1 to be subjected to shear stress in multiple directions, so that the forces in various directions of the platform support support portion 1 are more balanced, thereby effectively reducing the risk of micro-movement of the platform support prosthesis 100 relative to the tibia. Preferably, the angle range of the plane where the two plate-like protrusions 141 are located can be 90° to 170°. Also preferably, the protrusion 14 may include a plurality of plate-like protrusions 141 connected to the bottom surface 12, and the plane where each plate-like protrusion 141 is located can be arranged at an angle to the bottom surface 12.

[0037] In such Figures 1 to 4 In the preferred embodiment shown, the platform support connection part 2 may include a columnar handle 21 vertically fixedly connected to the bottom surface 12, two plate-like protrusions 141 may be respectively located on both sides of the columnar handle 21, and rib structures 22 are respectively formed on opposite sides of the outer wall of the columnar handle 21, and the rib structures 22 extend from the outer wall of the columnar handle 21 to connect with the bottom surface 12. Through this arrangement, on the one hand, the rib structure 22 formed on the columnar handle 21 can effectively improve the strength of the columnar handle 21, so as to further improve the stability of the tibial plateau support 100 after being connected to the tibia; on the other hand, the columnar handle 21 is vertically connected to the bottom surface 12, so that when the length of the columnar handle 21 is too long, the columnar handle 21 can effectively avoid the phenomenon of contacting the inner wall of the tibial medullary cavity and causing damage to the tibia. That is to say, through this arrangement, the length of the columnar handle 21 can also be extended, so as to further improve the stability of the connection between the tibial plateau support 100 and the tibia by increasing the contact area between the columnar handle 21 and the tibial medullary cavity.

[0038] Preferably, if Figure 1 As shown, the rib structure 22 may be constructed as a plate-like structure that gradually decreases from the bottom surface 12 along the length direction of the rib structure 22. Preferably, the angle between the planes where adjacent rib structures 22 are located may range from 90° to 170°, so as to further balance the shear stresses in multiple directions to which the platform support prosthesis 100 is subjected.

[0039] In a preferred embodiment, the angle between the plane where any plate-like protrusion 141 is located and the plane where the rib structure 22 near it is located can range from 30° to 90°. In combination with the above, it can be known that by setting the two plate-like protrusions 141 and the adjacent rib structure 22 at an angle, the shear stresses in multiple directions on the platform support prosthesis 100 can be balanced. By setting the plate-like protrusion 141 and the rib structure 22 at an angle, the shear stresses in multiple directions on the platform support prosthesis 100 can also be further balanced, so that the platform support prosthesis 100 can more effectively avoid the problem of micro-motion after being connected to the tibia of the human body, and thus can maximize its stability after connection.

[0040] Preferably, if Figure 2 As shown, the columnar shank 21 may be formed with a first hole 211 coaxially arranged along the axis of the columnar shank 21 and connected to the top of the columnar shank 21, a threaded hole 212 connected to the first hole 211, and a second hole 213 connected to the threaded hole 212 and the bottom of the columnar shank 21 at the same time, and the platform support 1 is formed with a through hole 111 that penetrates the platform support 1 and is coaxially connected to the first hole 211. The apertures of the first hole 211 and the second hole 213 are both larger than the aperture of the threaded hole 212, so that the threaded hole 212 can be used to fix the external component. Preferably, the inner wall of the second hole 213 may also be formed with a draft angle, that is, the aperture gradually increases from the end of the second hole 213 close to the threaded hole 212 to the end of the second hole 213 away from the threaded hole 212.

[0041] Preferably, the tibial plateau tray 100 may further include a medullary pin prosthesis 3 (combined with a screw threaded hole 212) detachably connected to the second hole 213. Figure 7 In addition, the present invention is also conducive to extending the length of the medullary needle prosthesis 3 by vertically connecting the columnar handle 21 with the bottom surface 12, which can not only effectively avoid the medullary needle prosthesis 3 from contacting the inner wall of the tibial medullary cavity to cause damage to the tibia, but also the extended medullary needle prosthesis 3 can more effectively improve the stability of the connection of the tibial plateau support 100.

[0042] In a preferred embodiment, the tibial plateau support 100 may also include an anti-rotation block (not shown in the figure) detachably connected to the first hole 211, and the anti-rotation block may include a first connecting column coaxially arranged inside the first hole 211 and a second connecting column connected to the first connecting column and located outside the first hole 211, and a first mounting hole that runs from the end of the first connecting column to the end of the second connecting column and is coaxially connected to the threaded hole 212. The fitting surface of the second connecting column is configured as a polygon. By providing an anti-rotation block and configuring the fitting surface of the second connecting column as a polygon, the rotation direction of the pad matched therewith can be effectively limited, so that it can effectively reduce the incidence of micro-motion of the pad, thereby reducing the wear between the pad and the tibial plateau support 100.

[0043] Preferably, the material of the tibial plateau support 100 may be a cobalt-chromium-molybdenum alloy. Also preferably, the top surface 11 may be formed as a smooth surface, and the bottom surface 12 and / or the surface of the platform support connection part 2 may be formed as a rough surface. Through this arrangement, on the one hand, the wear between the tibial plateau support 100 and the liner can be reduced by the smooth top surface 11; on the other hand, the fusion between the tibial plateau support 100 and the bone of the tibial medullary cavity can be enhanced by the rough bottom surface 12 and / or the platform support connection part 2, thereby effectively improving the stability of the tibial plateau support 100 after being connected to the tibia.

[0044] Figures 5 to 7 2 shows the structure of a knee joint prosthesis 200 according to the present invention. Figures 5 to 7 As shown, the knee joint prosthesis 200 includes the above-mentioned tibial plateau support 100 and a liner 4 fixedly connected to the tibial plateau support 100. The liner 4 is formed with a second mounting hole 41 (such as Figure 6 As shown). Preferably, the second mounting hole 41 may include a fixing hole 411 coaxial and connected to the first hole 211 of the tibial plateau support 100 and / or an anti-rotation groove (not shown in the figure) that is cooperatively connected to the second connecting column of the anti-rotation block of the tibial plateau support 100. Among them, the pad 4 can be fixedly connected to the threaded hole 212 by using screws to pass through the fixing hole 411 and the first hole 211 in sequence to connect the pad 4 to the tibial plateau support 100. It can be seen from the above that the knee joint prosthesis 200 using the above-mentioned tibial plateau support 100 can completely cover the osteotomy plane of the tibia to achieve an ideal bone coverage area, thereby effectively improving the stability of the knee joint prosthesis 200 after implantation, thereby reducing the risk of loosening of the knee joint prosthesis 200 in the long term. In long-term use, it can also avoid the phenomenon that the tibial plateau support 100 stimulates the soft tissue around the connection between it and the osteotomy plane to cause pain, thereby reducing the risk of intra-articular bleeding.

[0045] Preferably, the shape of the fitting surface of the anti-rotation groove can be configured as a polygon matching the shape of the fitting surface of the second connecting column.

[0046] In a preferred embodiment, the top surface of the tibial plateau support 100 may also be formed with a limiting groove 15 (combined with the tibial plateau support 100) that cooperates with the liner 4. Figure 2 As shown), transverse notches 151 may be formed on opposite sides of the limiting groove 15 (combined with Figure 3 As shown), the surface of the liner 4 that matches the tibial plateau support 100 may be formed with a first protrusion 42 (combined with the first protrusion 42) that matches the limiting groove 15. Figure 7 151), and a second convex portion (not shown) that cooperates with the notch 151. Through this arrangement, the incidence of micro-motion between the tibial plateau support 100 and the liner 4 can be further reduced, thereby effectively reducing the wear between the two.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A tibial plateau support, characterized in that: include: A platform support portion, the platform support portion comprising a top surface for connecting to a pad of a knee joint prosthesis and a bottom surface opposite to the top surface and for fitting to an osteotomy plane of a human tibia; and, A platform support connecting part, one end of which is fixedly connected to the bottom surface, and the other end of which is used to be implanted into the medullary cavity of a human tibia to be connected to the human tibia; Wherein, the bottom surface includes an inner portion close to the inner side of the human body and an outer portion connected to the inner portion and close to the outer side of the human body, the fitting surface area of ​​the inner portion is larger than the fitting surface area of ​​the outer portion, so that the bottom surface is formed as an asymmetric fitting surface; the platform support portion also includes at least one protrusion formed on the bottom surface, the protrusion includes two spaced apart plate-like protrusions vertically connected to the bottom surface, the planes where the two plate-like protrusions are located form an angle, the platform support connection portion includes a columnar handle portion vertically fixedly connected to the bottom surface, the two plate-like protrusions are respectively located on both sides of the columnar handle portion, and rib structures are respectively formed on the opposite sides of the outer side wall of the columnar handle portion, the rib structure extends from the outer side wall of the columnar handle portion to be connected to the bottom surface, and the columnar handle portion is provided with a plurality of protrusions. A first hole is formed inside the tibial support, which is coaxially arranged along the axis of the columnar support and connected to the top of the columnar support, a threaded hole is connected to the first hole, and a second hole is connected to both the threaded hole and the bottom of the columnar support. A through hole is formed on the platform support portion, which passes through the platform support portion and is coaxially connected to the first hole. The tibial platform support also includes an anti-rotation block detachably connected to the first hole, and the anti-rotation block includes a first connecting column coaxially arranged inside the first hole and a second connecting column connected to the first connecting column and located outside the first hole, and a first mounting hole passes through the end of the first connecting column to the end of the second connecting column and is coaxially connected to the threaded hole, wherein the fitting surface of the second connecting column is constructed as a polygon.

2. The tibial plateau tray according to claim 1, characterized in that: The angle between the plane where any of the plate-like protrusions is located and the plane where the rib structure close to it is located is in the range of 30° to 90°.

3. The tibial plateau tray according to claim 2, characterized in that: The tibial plateau tray also includes a medullary pin prosthesis detachably connected to the second hole through the threaded hole.

4. A knee joint prosthesis, characterized in that: It comprises a tibial plateau support according to any one of claims 1 to 3 and a pad fixedly connected to the tibial plateau support, wherein a second mounting hole is formed on the pad.

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