Knee prosthesis

Abstract

The present invention provides a knee joint prosthesis, comprising: a tibial plateau and a tibial pad, wherein the tibial pad is arranged on the tibial plateau; and a locking assembly, wherein the locking assembly is arranged on the tibial plateau and / or the tibial pad to lock the tibial pad on the tibial plateau. The knee joint prosthesis of the present invention solves the problem of unreliable connection between the tibial plateau and the tibial pad in the prior art.

Description

Technical Field

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

[0002] The knee joint prosthesis includes a femoral component and a tibial component, wherein the tibial component includes a tibial plateau and a tibial gasket. In the prior art, when the knee joint prosthesis is implanted into the tibia, the tibial plateau and the tibial gasket are generally snap-fitted. The snap-fitting structure is difficult to install and connect, and is prone to damage to the prosthesis. The tibial plateau and the tibial gasket are prone to loosening after being snap-fitted, and are also unreliable when connected to the tibia. Summary of the invention

[0003] The main purpose of the present invention is to provide a knee joint prosthesis to solve the problem of unreliable connection between the tibial plateau and the tibial pad in the prior art.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a knee joint prosthesis is provided, comprising: a tibial plateau and a tibial gasket, wherein the tibial gasket is arranged on the tibial plateau; and a locking assembly, wherein the locking assembly is arranged on the tibial plateau and / or the tibial gasket to lock the tibial gasket on the tibial plateau.

[0005] Furthermore, the locking assembly has a locking position and an avoidance position. The locking assembly is movably disposed on the tibial platform so as to lock the tibial gasket on the tibial platform when the locking assembly moves to the locking position, and to separate the locking assembly from the tibial gasket so as to allow the tibial gasket to move relative to the tibial platform when the locking assembly moves to the avoidance position.

[0006] Furthermore, the locking assembly includes a first locking portion and a second locking portion, the first locking portion and the second locking portion are relatively movably arranged, and a positioning space is provided between the first locking portion and the second locking portion; wherein, when the tibial pad moves into the positioning space, the first locking portion and the second locking portion move relatively close to each other to lock the tibial pad in the positioning space.

[0007] Furthermore, the knee joint prosthesis also includes: a connecting rod assembly, which is arranged on the tibial platform to drive the locking assembly to move.

[0008] Furthermore, the connecting rod assembly includes: a first connecting rod group, the first connecting rod group is connected to the first locking part; and a second connecting rod group, the second connecting rod group is connected to the second locking part; wherein the first connecting rod group and the second connecting rod group simultaneously drive the first locking part and the second locking part to move relatively closer or farther.

[0009] Furthermore, a driving part is provided on the tibial pad, so that when the tibial pad is connected to the tibial plateau, the driving part drives the connecting rod assembly to move so as to drive the locking assembly to move toward the locking position.

[0010] Furthermore, the driving part includes a driving column, an insertion hole is provided on the tibial platform, and the tibial pad is inserted in the insertion hole through the driving column to be connected to the tibial platform; wherein, the connecting rod assembly is at least partially arranged in the insertion hole, so that when the driving column is inserted in the insertion hole, the driving column contacts the connecting rod assembly and drives the connecting rod assembly to move.

[0011] Furthermore, a positioning protrusion is provided on the driving column, and a positioning groove is also provided on the tibial platform, and the positioning groove is arranged in the insertion hole; wherein, the driving column is inserted in the insertion hole, and the positioning protrusion is clamped in the positioning groove to lock the driving column in the insertion hole.

[0012] Furthermore, an insertion hole is provided on the tibial platform, and the knee joint prosthesis also includes: a positioning rod, which is at least partially inserted in the insertion hole to connect with the tibial platform; wherein one end of the positioning rod away from the tibial platform is inserted in the medullary cavity of the tibia to position the tibial platform on the tibia.

[0013] Furthermore, the knee joint prosthesis also includes a compression spring assembly, which is drivingly connected to the locking assembly to drive the locking assembly to move toward the avoidance position.

[0014] The knee prosthesis using the technical solution of the present invention is mainly used for prosthesis replacement of the knee joint. The knee prosthesis includes a tibial plateau and a tibial gasket. The tibial plateau and the tibial gasket in the prior art are mainly connected by a slot, and the tibial plateau clamps the tibial gasket, but the tibial gasket may still shake, and when the tibial gasket is connected by the slot, the tibial gasket needs to be squeezed onto the tibial plateau, which is difficult to install and easily causes wear. It is unstable after connection and inconvenient for secondary disassembly. In the present application, a locking assembly is provided on the tibial plateau to lock the tibial gasket on the tibial plateau. The locking assembly can be locked when locking is required without shaking, and can be loosened when disassembling, which is very convenient and solves the problem of unreliable connection between the tibial plateau and the tibial gasket in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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:

[0016] Figure 1 A structural cross-sectional view showing an embodiment of a knee joint prosthesis according to the present invention;

[0017] Figure 2 A cross-sectional schematic diagram showing an embodiment of the connection between the tibial plateau of the knee joint prosthesis of the present invention and the locking assembly and the connecting rod assembly;

[0018] Figure 3A schematic diagram of the installation structure of the tibial plateau and the locking assembly of the knee joint prosthesis of the present invention is shown;

[0019] Figure 4 A schematic diagram showing an embodiment of a tibial spacer of a knee prosthesis of the present invention;

[0020] Figure 5 A schematic diagram showing an embodiment of a positioning rod of a knee joint prosthesis of the present invention.

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

[0022] 10. Tibial plateau; 11. Insertion hole; 20. Tibial gasket; 21. Driving part; 211. Positioning protrusion; 30. Locking assembly; 31. First locking part; 32. Second locking part; 40. Connecting rod assembly; 41. First connecting rod group; 42. Second connecting rod group; 50. Positioning rod; 60. Compression spring assembly. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] The present invention provides a knee joint prosthesis, please refer to Figures 1 to 5 , including: a tibial plateau 10 and a tibial gasket 20, the tibial gasket 20 is arranged on the tibial plateau 10; a locking component 30, the locking component 30 is arranged on the tibial plateau 10 and / or the tibial gasket 20, so as to lock the tibial gasket 20 on the tibial plateau 10.

[0025] The knee prosthesis of the present invention is mainly used for prosthesis replacement of the knee joint. The knee prosthesis includes a tibial plateau and a tibial gasket 20. The tibial plateau and the tibial gasket in the prior art are mainly connected by a slot, and the tibial plateau clamps the tibial gasket, but the tibial gasket may still shake, and when the tibial gasket is clamped, the tibial gasket needs to be squeezed onto the tibial plateau, which is difficult to install and easily causes wear. It is unstable after connection and inconvenient for secondary disassembly. In the present application, a locking assembly 30 is provided on the tibial plateau to lock the tibial gasket 20 on the tibial plateau 10. The locking assembly can be locked when locking is required without shaking, and can be loosened when disassembling, which is very convenient and solves the problem of unreliable connection between the tibial plateau and the tibial gasket in the prior art.

[0026] The locking assembly 30 has a locking position and an escape position. The locking assembly 30 is movably disposed on the tibial plateau 10 so as to lock the tibial pad 20 on the tibial plateau 10 when the locking assembly 30 moves to the locking position, and when the locking assembly 30 moves to the escape position, the locking assembly 30 is separated from the tibial pad 20 so that the tibial pad 20 moves relative to the tibial plateau 10.

[0027] Preferably, a sliding track or a guide groove is further provided on the tibial platform, and the locking assembly is movably arranged in the sliding track or the guide groove to move between a locking position and an avoidance position.

[0028] The locking assembly 30 includes a first locking portion 31 and a second locking portion 32, which are relatively movably arranged, and there is a positioning space between the first locking portion 31 and the second locking portion 32; wherein, when the tibial pad 20 moves into the positioning space, the first locking portion 31 and the second locking portion 32 move relatively close to each other to lock the tibial pad 20 in the positioning space.

[0029] In this embodiment, the first locking portion 31 and the second locking portion 32 are both arc-shaped buckles. When locking is required, the first locking portion 31 and the second locking portion 32 move closer to each other, thereby fixing the tibial pad in the positioning space.

[0030] The knee joint prosthesis further includes: a connecting rod assembly 40, which is disposed on the tibial plateau 10 to drive the locking assembly 30 to move. The connecting rod assembly 40 includes: a first connecting rod group 41, which is connected to the first locking portion 31; and a second connecting rod group 42, which is connected to the second locking portion 32; wherein the first connecting rod group 41 and the second connecting rod group 42 simultaneously drive the first locking portion 31 and the second locking portion 32 to move relatively closer or farther.

[0031] The knee joint prosthesis in this embodiment also includes a connecting rod assembly 40, which is hinged to the locking assembly. Preferably, the connecting rod assembly includes two relative connecting rod groups, and the first connecting rod group and the second connecting rod group are respectively connected to the first locking part and the second locking part, and the first locking part and the second locking part are driven to move simultaneously by simultaneously driving the first connecting rod group and the second connecting rod group to move.

[0032] The tibial pad 20 is provided with a driving part 21, so that when the tibial pad 20 is connected to the tibial plateau 10, the driving part 21 drives the connecting rod assembly 40 to move so as to drive the locking assembly 30 to move toward the locking position. The driving part 21 includes a driving column, and the tibial plateau 10 is provided with an insertion hole 11, and the tibial pad 20 is inserted into the insertion hole 11 through the driving column to be connected to the tibial plateau 10; wherein the connecting rod assembly 40 is at least partially arranged in the insertion hole 11, so that when the driving column is inserted in the insertion hole 11, the driving column contacts the connecting rod assembly 40 and drives the connecting rod assembly 40 to move.

[0033] In this embodiment, an insertion hole 11 is provided on the tibial platform, one end of the first connecting rod group is located in the insertion hole 11 and the other end is hinged to the first locking portion, one end of the second connecting rod group is located in the insertion hole and the other end is hinged to the second locking portion, and during the process of the driving column on the tibial gasket moving into the insertion hole, the driving column contacts the first connecting rod group and the second connecting rod group and pushes the first connecting rod group and the second connecting rod group to move, so that the locking assembly moves toward the driving column to clamp the driving column, thereby connecting the tibial gasket to the tibial platform.

[0034] The drive column is provided with a positioning protrusion 211, and the tibial platform 10 is also provided with a positioning groove, which is arranged in the insertion hole 11; wherein, the drive column is inserted in the insertion hole 11, and the positioning protrusion 211 is clamped in the positioning groove to lock the drive column in the insertion hole 11.

[0035] In this embodiment, a circle of positioning protrusions 211 are further provided at the end of the driving column, and a positioning groove is provided at the position where the tibial platform cooperates with the positioning protrusion. When the positioning protrusion 211 is locked in the positioning groove, the tibial gasket and the tibial platform cooperate tightly, and the positioning protrusion can prevent the positioning gasket from detaching from the positioning platform.

[0036] An insertion hole 11 is provided on the tibial plateau 10, and the knee joint prosthesis also includes: a positioning rod 50, which is at least partially inserted into the insertion hole 11 to be connected to the tibial plateau 10; wherein, one end of the positioning rod 50 away from the tibial plateau 10 is inserted into the medullary cavity of the tibia to position the tibial plateau 10 on the tibia.

[0037] Preferably, an internal thread is provided at the lower part of the insertion hole, and an external thread is provided at one end of the positioning rod connected to the insertion hole so that the positioning rod is threadedly connected to the tibial plateau, and the lower end of the positioning rod is inserted into the medullary cavity of the tibia to fix the positioning platform and the tibia together, so that the tibial gasket, tibial plateau and tibia are reliably connected.

[0038] The knee joint prosthesis further comprises a compression spring assembly 60, which is drivingly connected to the locking assembly 30 to drive the locking assembly 30 to move toward the avoidance position.

[0039] Preferably, the compression spring assembly is disposed on the tibial platform, and the compression spring assembly 60 includes two compression springs, which are respectively connected to the first connecting rod assembly and the second connecting rod assembly to provide the locking assembly with a force to move toward the avoidance position through the connecting rod assembly.

[0040] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0041] The knee joint prosthesis in the present application is provided with a connecting rod assembly and a locking assembly. The locking assembly is preferably a locking claw. When the tibial gasket is installed, the lower driving column pushes the connecting rod assembly downward, and the multi-stage connecting rod drives the two upper locking claws to slide inward through the guide groove track to fasten the tibial gasket, thereby forming a lock.

[0042] The knee joint prosthesis in the present application can be connected to a positioning rod through threads at the bottom.

[0043] The lower driving column of the tibial pad of the knee joint prosthesis in the present application has a matching design with the inner structure of the positioning rod head, and can be directly pressed into a locking fit.

[0044] During prosthetic surgery, after the osteotomy is completed, the tibial plateau and the positioning rod are first connected by threads and inserted into the medullary cavity of the tibia for fixation.

[0045] The tibial pad is then vertically pressed into the tibial platform and locked in cooperation with the positioning rod hole groove. At the same time, the platform locking assembly locks the tibial pad to complete the installation, thereby enhancing the installation stability of the tibial pad.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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: A tibial plateau (10) and a tibial gasket (20), wherein the tibial gasket (20) is arranged on the tibial plateau (10); A locking assembly (30), wherein the locking assembly (30) is arranged on the tibial platform (10) to lock the tibial pad (20) on the tibial platform (10), the locking assembly (30) having a locking position and an escape position, the locking assembly (30) being movably arranged on the tibial platform (10) to lock the tibial pad (20) on the tibial platform (10) when the locking assembly (30) moves to the locking position, and When the locking assembly (30) moves to the avoidance position, the locking assembly (30) is separated from the tibial pad (20) so that the tibial pad (20) moves relative to the tibial platform (10), the locking assembly (30) comprising a first locking portion (31) and a second locking portion (32), the first locking portion (31) and the second locking portion (32) being relatively movably arranged, and a positioning space being provided between the first locking portion (31) and the second locking portion (32); Wherein, when the tibial pad (20) moves into the positioning space, the first locking portion (31) and the second locking portion (32) move relatively close to each other so as to lock the tibial pad (20) in the positioning space; a compression spring assembly (60), the compression spring assembly (60) being drivingly connected to the locking assembly (30) so as to drive the locking assembly (30) to move toward the avoidance position; A connecting rod assembly (40), the connecting rod assembly (40) being arranged on the tibial platform (10) to drive the locking assembly (30) to move, the connecting rod assembly (40) comprising: A first connecting rod assembly (41), the first connecting rod assembly (41) being connected to the first locking portion (31); A second connecting rod assembly (42), the second connecting rod assembly (42) being connected to the second locking portion (32); The first connecting rod group (41) and the second connecting rod group (42) simultaneously drive the first locking portion (31) and the second locking portion (32) to move relatively closer or farther away.

2. The knee joint prosthesis according to claim 1, characterized in that: The tibial pad (20) is provided with a driving portion (21), so that when the tibial pad (20) is connected to the tibial platform (10), the driving portion (21) drives the connecting rod assembly (40) to move, thereby driving the locking assembly (30) to move toward the locking position.

3. The knee joint prosthesis according to claim 2, characterized in that: The driving part (21) comprises a driving column, an insertion hole (11) is provided on the tibial platform (10), and the tibial gasket (20) is inserted into the insertion hole (11) through the driving column to be connected to the tibial platform (10); The connecting rod assembly (40) is at least partially disposed in the insertion hole (11), so that when the driving column is inserted in the insertion hole (11), the driving column contacts the connecting rod assembly (40) and drives the connecting rod assembly (40) to move.

4. The knee joint prosthesis according to claim 3, characterized in that: A positioning protrusion (211) is provided on the driving column, and a positioning groove is also provided on the tibial platform (10), wherein the positioning groove is arranged in the insertion hole (11); The driving column is inserted into the insertion hole (11), and the positioning protrusion (211) is clamped in the positioning groove to lock the driving column in the insertion hole (11).

5. The knee joint prosthesis according to claim 1, characterized in that: The tibial platform (10) is provided with an insertion hole (11), and the knee joint prosthesis further comprises: a positioning rod (50), the positioning rod (50) being at least partially inserted into the insertion hole (11) to be connected to the tibial platform (10); Wherein, one end of the positioning rod (50) away from the tibial platform (10) is inserted into the medullary cavity of the tibia to position the tibial platform (10) on the tibia.

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