Knee prosthesis

Abstract

The present invention provides a knee joint prosthesis, comprising: a tibial plateau; a mounting platform, the mounting platform being mounted on the tibial plateau; a connecting portion, arranged between the tibial plateau and the mounting platform and fixing the mounting platform on the tibial plateau; wherein the tibial plateau and the mounting platform are arranged at intervals. The technical solution of the present application effectively solves the problem of stability of the tibial plateau in the related art.

Description

Technical Field

[0001] The present invention relates to the field of medical equipment, and in particular to a knee joint prosthesis. Background Art

[0002] Artificial knee prostheses are used to compensate for the patient's damaged or diseased physiological knee joint, with the aim of eliminating the patient's pain, correcting joint deformities, and restoring the patient's mobility.

[0003] At present, knee tibial plateau prostheses are divided into two types: cement fixation and biological fixation. Cement fixation is more widely used, but after cement fixation, the prosthesis is not in contact with the patient's physiological bone, and "bone ingrowth" cannot be achieved; the biological fixation method is usually a prosthesis made of a porous structure. After the prosthesis is implanted, the human bone structure can grow into the porous structure. The above-mentioned biological fixation method will result in poor fixation effect due to the limited length of human bone structure ingrowth. In summary, the long-term service stability of the knee tibial plateau prosthesis in the relevant technology is not ideal. Summary of the invention

[0004] The main purpose of the present invention is to provide a knee joint prosthesis to solve the problem of poor fixation effect of the tibial plateau in the related art.

[0005] In order to achieve the above objectives, the present invention provides a knee joint prosthesis, comprising: a tibial plateau; a mounting platform, the mounting platform being mounted on the tibial plateau; a connecting portion, arranged between the tibial plateau and the mounting platform and fixing the mounting platform on the tibial plateau; wherein the tibial plateau and the mounting platform are spaced apart.

[0006] Furthermore, the knee joint prosthesis further comprises convex ribs arranged on the tibial plateau and / or the mounting platform.

[0007] Furthermore, the convex ribs include a plurality of convex ribs arranged at intervals, and the plurality of convex ribs are arranged in parallel.

[0008] Furthermore, the cross section of the convex rib is semicircular or polygonal.

[0009] Furthermore, the convex rib is arranged on the upper surface of the tibial plateau, and the height a of the convex rib protruding from the upper surface of the tibial plateau ranges from 1 mm to 1.5 mm.

[0010] Furthermore, the connecting part includes a connecting column arranged on the tibial platform, a threaded hole is arranged on the connecting column, a connecting hole corresponding to the threaded hole is arranged on the mounting platform, and the connecting part also includes a fastener passing through the connecting hole and the threaded hole.

[0011] Furthermore, the mounting platform includes a platform body and a surrounding edge arranged on the lower surface of the platform body, a first gap H is defined between the surrounding edge and the upper surface of the tibial platform, and a second gap is defined between the lower surface of the platform body and the upper surface of the tibial platform.

[0012] Furthermore, the first gap H is between 2 mm and 8 mm.

[0013] Furthermore, the knee joint prosthesis also includes a gasket component, a locking portion is arranged on the upper surface of the mounting platform, and the gasket component is arranged in the locking portion.

[0014] Furthermore, the tibial plateau and the mounting platform are porous coating structures or trabecular bone structures.

[0015] By applying the technical solution of the present invention, the mounting platform is mounted on the tibial platform and fixedly arranged, and the connecting part is arranged between the tibial platform and the mounting platform. Under the action of the connecting part, the tibial platform and the mounting platform are fixed. There is a gap between the tibial platform and the mounting platform. When the doctor performs a knee prosthesis replacement operation, the above-mentioned gap can be filled with the patient's healthy autologous bone, allogeneic bone or other bone induction factors. After filling, the knee prosthesis is installed in the patient's body. As the patient heals after surgery, the patient's own bone structure can contact the bone structure filled in the gap and grow together with the filled bone structure, thereby effectively improving the fixation effect, making the patient's postoperative effect better, and enabling the knee prosthesis to be used for a long time. Through the setting of the above-mentioned gap, the knee prosthesis can grow together with the patient's own bone structure, and the growing bone structure can have a downward pulling effect on the knee prosthesis, which can prevent the knee prosthesis from loosening, thereby making the effect of the biological fixation of the knee prosthesis better. Therefore, the technical solution of the present application effectively solves the problem of poor stability of the tibial plateau in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of a knee joint prosthesis according to the present invention is shown;

[0018] Figure 2 Shows Figure 1 Schematic diagram of the three-dimensional structure of the tibial plateau of the knee joint prosthesis;

[0019] Figure 3 Shows Figure 1 AA section diagram of a knee joint prosthesis;

[0020] Figure 4 Shows Figure 1 A schematic diagram of the three-dimensional structure of a mounting platform of a knee joint prosthesis; and

[0021] Figure 5 Shows Figure 4 Schematic diagram of top view of the installation platform.

[0022] The above drawings include the following reference numerals:

[0023] 10. Tibial plateau; 20. Mounting platform; 21. Connecting hole; 22. Platform body; 23. Surrounding edge; 24. Locking part; 30. Connecting part; 31. Connecting column; 40. Raised rib; 50. Fastener. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0027] In order to improve the fixation effect of the knee prosthesis, so that the patient can heal faster after the knee prosthesis is implanted in the patient's body. Figures 1 to 3 As shown, in this embodiment, the knee joint prosthesis includes: a tibial plateau 10; a mounting platform 20, and a connecting portion 30, wherein the mounting platform 20 is mounted on the tibial plateau 10. The connecting portion 30 is arranged between the tibial plateau 10 and the mounting platform 20 and fixes the mounting platform 20 on the tibial plateau 10. The tibial plateau 10 and the mounting platform 20 are arranged at intervals.

[0028] By applying the technical solution of this embodiment, the mounting platform 20 is mounted on the tibial plateau 10 and fixedly arranged, and the connecting portion 30 is arranged between the tibial plateau 10 and the mounting platform 20. Under the action of the connecting portion 30, the tibial plateau 10 and the mounting platform 20 are fixed. There is a gap between the tibial plateau 10 and the mounting platform 20. When the doctor performs a knee prosthesis replacement operation, the above-mentioned gap can be filled with the patient's healthy autologous bone, allogeneic bone or other bone induction factors. After filling, the knee prosthesis is installed in the patient's body. As the patient heals after surgery, the patient's own bone structure can contact the bone structure filled in the gap and grow together with the filled bone structure, thereby effectively improving the fixation effect, making the patient's postoperative effect better, and enabling the knee prosthesis to be used for a long time. Through the setting of the above-mentioned gap, the knee prosthesis can grow together with the patient's own bone structure, and the growing bone structure can have a downward pulling effect on the knee prosthesis, which can prevent the knee prosthesis from loosening, thereby making the effect of the biological fixation of the knee prosthesis better. Therefore, the technical solution of this embodiment effectively solves the problem of poor stability of the tibial plateau in the related art.

[0029] The outer contour of the tibial plateau 10 is an anatomical design that matches the physiological tibial plateau of the human body, thereby improving the prosthesis coverage. The upper surface of the mounting platform 20 is designed with a locking portion 24 that can cooperate with the gasket prosthesis. The outer contour of the mounting platform 20 can be anatomical, and of course can also be symmetrical.

[0030] The tibial plateau 10 and the mounting platform 20 are spaced apart to form a cavity, and the cavity is filled with fillers such as the patient's healthy autologous bone, allogeneic bone or other bone induction factors.

[0031] In order to allow the filler to stay in the gap between the tibial plateau and the mounting platform, Figures 1 to 3As shown, in this embodiment, the knee joint prosthesis also includes a convex rib 40 disposed on the tibial plateau 10. The convex rib can play a blocking role. When performing a knee joint prosthesis replacement operation, the gap between the mounting platform 20 and the tibial plateau 10 is filled with the patient's healthy autologous bone, allogeneic bone or other bone induction factors. The above-mentioned filler can effectively stay in the gap under the action of the convex rib 40, which can improve the fixation effect of the knee joint prosthesis and improve the postoperative healing effect of the patient. In addition, the convex rib 40 can increase the structural strength of the tibial plateau 10.

[0032] In an embodiment not shown in the figures, a convex rib is provided on the side of the mounting platform facing the tibial plateau.

[0033] like Figure 2 As shown, in this embodiment, the convex ribs 40 include a plurality of convex ribs 40 arranged at intervals, and the plurality of convex ribs 40 are arranged in parallel. The convex ribs 40 arranged at intervals can improve the blocking effect on the one hand, and can ensure that the gap between the tibial plateau 10 and the mounting platform 20 is larger on the other hand, so that more healthy autologous bone, allogeneic bone or other bone induction factors of the patient can be filled, thereby improving the healing effect of the patient and preventing the knee joint prosthesis from loosening. In this embodiment, there are 7 convex ribs 40, and there are gaps between the convex ribs 40, and the connecting portion 30 is arranged in the gaps.

[0034] Considering the complexity of the overall structure of the tibial plateau and the blocking effect, such as Figure 2 As shown, in this embodiment, the cross section of the convex rib 40 is semicircular. The convex rib 40 with a semicircular cross section has a simple structure, is easy to set, and can effectively block the filler. At the same time, the semicircular structure has a smooth surface, which is conducive to the growth of bone structure.

[0035] Of course, in an embodiment not shown in the figure, the cross-section of the convex rib is polygonal, and the above-mentioned polygonal convex rib can take into account both the blocking effect and the bone ingrowth effect.

[0036] like Figure 2 and Figure 3 As shown, in this embodiment, the convex rib 40 is disposed on the upper surface of the tibial plateau 10, and the height a of the convex rib 40 protruding from the upper surface of the tibial plateau 10 is 3 mm. The height of the convex rib 40 can effectively block the filler, and at the same time, the height of the convex rib 40 can take into account the size of the gap between the tibial plateau 10 and the mounting platform 20 and the blocking effect. In this embodiment, the height a is 3 mm, and the first gap H is 6 mm. The distance between two adjacent convex ribs 40 is greater than the size of the two convex ribs 40.

[0037] Of course, the height a of the rib can achieve the above effect as long as it is in the range of 1 mm to 5 mm. The value of the height a is smaller than the value of the first gap H to avoid interference between the rib 40 and the surrounding edge 23 .

[0038] In order to allow clearance between the tibial plateau and the mounting platform. Figures 1 to 3 As shown, in this embodiment, the connection part 30 includes a connection column 31 arranged on the tibial plateau 10, a threaded hole is arranged on the connection column 31, and a connection hole 21 corresponding to the threaded hole is arranged on the mounting platform 20, and the connection part 30 also includes a fastener 50 inserted into the connection hole 21 and the threaded hole. The structure of the connection column 31 is simple, and the connection column 31 can play the role of supporting the mounting platform 20 and fixing the mounting platform 20. After the fastener 50 fixes the mounting platform 20 and the tibial plateau 10, the upper surface of the fastener 50 is lower than the upper surface of the mounting platform 20, which can effectively ensure the sliding of the gasket component on the mounting platform 20, avoid interference between the fastener 50 and the gasket component, and affect the movement of the gasket component.

[0039] To further ensure that the filler can stay in the gap between the tibial plateau and the mounting platform, Figures 3 to 5 As shown, in this embodiment, the mounting platform 20 includes a platform body 22 and a surrounding edge 23 arranged on the lower surface of the platform body 22, a first gap H is formed between the surrounding edge 23 and the upper surface of the tibial plateau 10, and a second gap is formed between the lower surface of the platform body 22 and the upper surface of the tibial plateau 10. The setting of the surrounding edge 23 further prevents the filler from falling off from the second gap. At the same time, the surrounding edge 23 can improve the structural strength of the mounting platform 20, so that the mounting platform 20 is not easily deformed. The value of the first gap H is less than or equal to the value of the second gap.

[0040] In an embodiment not shown in the figure, the mounting platform only comprises the platform body. The arrangement blocks the filler only by the ribs.

[0041] like Figures 3 to 5 As shown, in this embodiment, the first gap H is 6 mm. A height of 6 mm can accommodate more fillers, which can improve the effect of biological fixation.

[0042] Of course, the first gap H can be set between 2 mm and 8 mm according to actual needs.

[0043] like Figure 1 As shown, in this embodiment, the knee joint prosthesis further includes a gasket component, and a locking portion 24 is provided on the upper surface of the mounting platform 20, and the gasket component is arranged in the locking portion 24. The arrangement of the locking portion 24 can play a role in fixing the gasket component, making the overall structure of the knee joint prosthesis more compact. Figure 1As shown, a groove is provided on the gasket component, and the groove faces the center position of the mounting platform 20. The groove cooperates with the gasket component to effectively achieve a fixing effect. The locking portion 24 includes a first part and a second part. The first part includes a protruding portion and an arc-shaped portion. The gap between the protruding portion and the second part is smaller than the gap between the arc-shaped portion and the second part. The first part and the second part enclose an installation space, and the gasket component is arranged in the installation space. The groove is arranged on the first part and the second part.

[0044] like Figures 1 to 5 As shown, in this embodiment, the tibial plateau 10 and the mounting platform 20 are porous coating structures, which are convenient for contacting with the bone structure and can grow together with the bone structure. Of course, the material of the tibial plateau and the mounting platform can also be a small bone-like structure. The above-mentioned porous coating structure includes a porous structure and a bioactive substance, and the porous structure is covered with the bioactive substance.

[0045] like Figure 1 As shown, in this embodiment, the tibial platform 10 includes a support platform, a column and an anti-rotation wing, wherein the anti-rotation wing is arranged on the side of the column and connected to the bottom surface of the support platform. The anti-rotation wing can make the knee joint prosthesis more stable after implantation, and at the same time, the anti-rotation wing can support the support part and improve the structural strength of the support part.

[0046] The knee joint prosthesis in the technical solution of this embodiment consists of a tibial plateau 10, a mounting platform 20, a connecting part 30, an anti-rotation wing and a column inserted into the patient's tibial medullary cavity, in contact with the patient's bone, to achieve biological fixation; the mounting platform 20 is connected to the tibial plateau 10 by a fastener 50, and a locking part 24 is designed on the upper surface of the mounting platform 20, which can cooperate with the gasket component to achieve the integrated stability of the knee joint prosthesis. After implantation, the knee joint prosthesis can be in direct contact with the patient's bone, and after the bone interface is treated with a special process, it can achieve "bone ingrowth" with the patient's physiological bone, achieving long-term stability and increasing the service life of the prosthesis.

[0047] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0048] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0049] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A knee joint prosthesis, characterized in that: include: Tibial plateau (10); A mounting platform (20), the mounting platform (20) being mounted on the tibial platform (10); A connecting portion (30) is disposed between the tibial platform (10) and the mounting platform (20) and fixes the mounting platform (20) on the tibial platform (10); Wherein, the tibial platform (10) and the mounting platform (20) are arranged at intervals; The knee joint prosthesis further comprises a convex rib (40) arranged on the tibial platform (10) and / or the mounting platform (20); The cross section of the convex rib (40) is semicircular or polygonal; The convex rib (40) is arranged on the upper surface of the tibial platform (10).

2. The knee joint prosthesis according to claim 1, characterized in that: The convex ribs (40) include a plurality of convex ribs (40) arranged at intervals, and the plurality of convex ribs (40) are arranged in parallel.

3. The knee joint prosthesis according to claim 1, characterized in that: The height a of the convex rib (40) protruding from the upper surface of the tibial plateau (10) ranges from 1 mm to 5 mm.

4. The knee joint prosthesis according to claim 1, characterized in that: The connecting portion (30) comprises a connecting column (31) arranged on the tibial platform (10), the connecting column (31) being provided with a threaded hole, the mounting platform (20) being provided with a connecting hole (21) corresponding to the threaded hole, and the connecting portion (30) further comprises a fastener (50) penetrating the connecting hole (21) and the threaded hole.

5. The knee joint prosthesis according to claim 1, characterized in that: The mounting platform (20) comprises a platform body (22) and a surrounding edge (23) arranged on the lower surface of the platform body (22), a first gap H is provided between the surrounding edge (23) and the upper surface of the tibial platform (10), and a second gap is provided between the lower surface of the platform body (22) and the upper surface of the tibial platform (10).

6. The knee joint prosthesis according to claim 5, characterized in that: The first gap H is between 2 mm and 8 mm.

7. The knee joint prosthesis according to claim 1, characterized in that: The knee joint prosthesis also includes a gasket component, a locking portion (24) is provided on the upper surface of the mounting platform (20), and the gasket component is arranged in the locking portion (24).

8. The knee joint prosthesis according to claim 1, characterized in that: The tibial platform (10) and the mounting platform (20) are porous coating structures or trabecular bone structures.

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