Unicompartmental knee prosthesis

Abstract

The present invention provides a unicompartmental knee prosthesis. The unicompartmental knee prosthesis comprises: a tibial plateau prosthesis assembly, comprising a tibial connection portion and a support portion arranged on the tibial connection portion; a femoral condyle prosthesis, arranged on the support portion, the surface of the support portion facing the femoral condyle prosthesis having an arc-shaped slide groove cooperating with the femoral condyle prosthesis; a limiting assembly, arranged on the tibial connection portion, the limiting assembly comprising a plurality of limiting structures, at least two of which are respectively located at the front and rear sides of the support portion to limit and stop the support portion; wherein at least one of the at least two limiting structures is detachably connected to the tibial connection portion. The present invention effectively solves the problem in the prior art that the support portion of the unicompartmental knee prosthesis is easy to come out.

Description

Technical Field

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

[0002] At present, there is a 4.6% revision probability after a unicompartmental knee replacement surgery, of which 33% is due to dislocation of the support part (polyethylene liner), that is, the support part (polyethylene liner) in the unicompartmental knee prosthesis in the prior art is prone to dislocation, which affects the stability of the unicompartmental knee prosthesis and reduces the reliability of the unicompartmental knee prosthesis. Summary of the invention

[0003] The main purpose of the present invention is to provide a unicompartmental knee joint prosthesis to solve the problem that the supporting part of the unicompartmental knee joint prosthesis in the prior art is easy to come out.

[0004] In order to achieve the above-mentioned objectives, the present invention provides a unicompartmental knee prosthesis, comprising: a tibial plateau prosthesis assembly, comprising a tibial connecting portion and a supporting portion arranged on the tibial connecting portion; a femoral condyle prosthesis, which is arranged on the supporting portion, and the surface of the supporting portion facing the femoral condyle prosthesis has an arc-shaped groove that cooperates with the femoral condyle prosthesis; a limiting assembly, which is arranged on the tibial connecting portion, and the limiting assembly includes a plurality of limiting structures, at least two of which are respectively located on the front and rear sides of the supporting portion to limit and stop the supporting portion; wherein at least one of the at least two limiting structures is detachably connected to the tibial connecting portion.

[0005] Furthermore, the at least two limiting structures include a first limiting structure and a second limiting structure, the first limiting structure is detachably connected to the tibial connection part, and the unicompartmental knee prosthesis also includes: a fastener, and the first limiting structure is connected to the tibial connection part and / or the tibia through the fastener.

[0006] Furthermore, the first limiting structure includes a first protrusion, and the support portion has a first recess, and the first protrusion extends into the first recess to cooperate with the first recess, so that the first limiting structure limits the support portion.

[0007] Furthermore, the tibial connecting part has a through hole, and the first limiting structure also includes: a first body, the first protrusion is connected to the first body and is located at one end of the first body, the first body is inserted into the through hole so that the first protrusion is located on the side of the tibial connecting part facing the supporting part, and the other end of the first body has a through hole for a fastener to pass through, and the fastener is connected to the tibia after passing through the through hole.

[0008] Furthermore, the first body has a limiting step surface, and the limiting step surface and the surface of the tibia connecting part facing the supporting part are limited and stopped, so that the first protrusion and the first recess are arranged correspondingly.

[0009] Furthermore, the second limiting structure includes a second protrusion, the support portion has a second recess, and the second protrusion extends into the second recess to cooperate with the second recess, so that the second limiting structure limits the support portion.

[0010] Furthermore, the second limiting structure also includes a second body connected to the second protrusion, and the second protrusion is connected to the tibial connecting part through the second body; wherein the second limiting structure and the tibial connecting part are manufactured by an integrated molding process.

[0011] Further, the first recess is a first groove-shaped structure, and / or the second recess is a second groove-shaped structure.

[0012] Furthermore, the first protrusion has a first arc-shaped surface on one side facing the support portion, and the first groove-shaped structure is a first arc-shaped groove matched with the first arc-shaped surface.

[0013] Furthermore, the second protrusion has a second arc-shaped surface on one side facing the support portion, and the second groove-shaped structure is a second arc-shaped groove matched with the second arc-shaped surface.

[0014] Furthermore, the limiting assembly also includes a third limiting structure, the third limiting structure is located on one side of the supporting portion, and the first limiting structure and the second limiting structure are located on a side of the third limiting structure facing the supporting portion.

[0015] By applying the technical solution of the present invention, during the movement of the tibia relative to the femur, the femoral condyle prosthesis slides along the surface of the support portion to meet the normal function of the knee joint. In the above process, at least two limiting structures are respectively located on both sides of the support portion to limit and stop the support portion, thereby preventing the support portion from escaping from the tibial connection portion and affecting the reliability of use of the unicompartmental knee prosthesis, thereby solving the problem of the support portion of the unicompartmental knee prosthesis in the prior art being easily escaping, and improving the reliability of use of the unicompartmental knee prosthesis. Among them, at least one of the at least two limiting structures is detachably connected to the tibial connection portion, and after the installation of the femoral condyle prosthesis is completed, at least one limiting structure detachably connected to the tibial connection portion is installed on the tibial connection portion to limit and stop the support portion. 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 three-dimensional structural schematic diagram of an embodiment of a unicompartmental knee joint prosthesis according to the present invention is shown;

[0018] Figure 2 Shows Figure 1Front view of the tibial connection of the unicondylar knee prosthesis;

[0019] Figure 3 Shows Figure 2 A top view of the tibial attachment in FIG.

[0020] Figure 4 Shows Figure 1 A front view of the support portion of a unicompartmental knee prosthesis;

[0021] Figure 5 Shows Figure 4 A top view of the support portion in FIG.

[0022] Figure 6 Shows Figure 2 A front view of the tibia connecting part and the first limiting structure after being assembled;

[0023] Figure 7 Shows Figure 1 A schematic diagram of the three-dimensional structure of the first limiting structure of the unicompartmental knee prosthesis; and

[0024] Figure 8 Shows Figure 7 A schematic diagram of the three-dimensional structure of the first limiting structure from another angle.

[0025] The above drawings include the following reference numerals:

[0026] 10. Tibial plateau prosthesis assembly; 11. Tibial connecting portion; 111. Through hole; 12. Support portion; 121. First recess; 122. Second recess; 123. Arc-shaped slide groove; 20. Femoral condyle prosthesis; 30. Limiting assembly; 31. First limiting structure; 311. First protrusion; 312. First body; 312a. Limiting step surface; 32. Second limiting structure; 321. Second protrusion; 322. Second body; 33. Third limiting structure; 40. Fastener. DETAILED DESCRIPTION

[0027] 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.

[0028] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0029] In the present invention, unless otherwise specified, the directional words used, such as "up" and "down", usually refer to the directions shown in the drawings, or to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0030] In order to solve the problem that the supporting part of the unicompartmental knee joint prosthesis in the prior art is easy to fall out, the present application provides a unicompartmental knee joint prosthesis.

[0031] like Figure 1 and Figure 5 As shown, the unicompartmental knee prosthesis includes a tibial plateau prosthesis component 10, a femoral condyle prosthesis 20 and a limiting component 30. The tibial plateau prosthesis component 10 includes a tibial connection portion 11 and a support portion 12 disposed on the tibial connection portion 11. The femoral condyle prosthesis 20 is disposed on the support portion 12, and the surface of the support portion 12 facing the femoral condyle prosthesis 20 has an arc-shaped slide groove 123 that cooperates with the femoral condyle prosthesis 20. The limiting component 30 is disposed on the tibial connection portion 11, and the limiting component 30 includes three limiting structures, two of which are respectively located at the front and rear sides of the support portion 12 to limit and stop the support portion 12; wherein one of the two limiting structures is detachably connected to the tibial connection portion 11.

[0032] By applying the technical solution of this embodiment, during the movement of the tibia relative to the femur, the femoral condyle prosthesis 20 slides along the surface of the support portion 12 to meet the normal function of the knee joint. In the above process, the two limiting structures are respectively located on both sides of the support portion 12 to limit and stop the support portion 12, thereby preventing the support portion 12 from coming off the tibial connection portion 11 and affecting the reliability of the use of the unicompartmental knee prosthesis, thereby solving the problem of the support portion of the unicompartmental knee prosthesis in the prior art being easily dislodged, and improving the reliability of the use of the unicompartmental knee prosthesis. Among them, one of the two limiting structures is detachably connected to the tibial connection portion 11. After the installation of the femoral condyle prosthesis 20 is completed, a limiting structure detachably connected to the tibial connection portion 11 is installed on the tibial connection portion 11 to limit and stop the support portion 12.

[0033] It should be noted that the number of the limiting structures is not limited thereto. Optionally, the limiting assembly 30 includes four, five, or six limiting structures. In this way, the above arrangement enables the limiting assembly 30 to better limit the support portion 12, further preventing the support portion 12 from coming off the tibial connection portion 11 and affecting the reliability of the unicompartmental knee prosthesis, thereby reducing the probability of revision of the unicompartmental knee prosthesis.

[0034] In this embodiment, the front and rear sides of the support portion 12 refer to: along the sliding direction of the support portion 12 , the two limiting structures are respectively located at the front and rear sides of the support portion 12 .

[0035] like Figures 1 to 3 and Figure 6 As shown, the two limiting structures include a first limiting structure 31 and a second limiting structure 32, the first limiting structure 31 is detachably connected to the tibial connection part 11, and the unicompartmental knee prosthesis further includes a fastener 40. The first limiting structure 31 is connected to the tibia through the fastener 40. In this way, when the support part 12 and the femoral condyle prosthesis 20 are installed, the first limiting structure 31 and the tibial connection part 11 are in a separated state, and when the support part 12 is located on the support part 12, the first limiting structure 31 and the tibial connection part 11 are assembled together through the fastener 40 to prevent the first limiting structure 31 from coming off the tibial connection part 11 and affecting the reliability of the unicompartmental knee prosthesis.

[0036] In this embodiment, the first limiting structure 31 is located at the front side of the supporting portion 12 .

[0037] Optionally, the fastener 40 is a titanium nail.

[0038] It should be noted that the connection method of the fastener 40 is not limited to this. Optionally, the fastener 40 is connected to the tibial connection part 11, so that the first limiting structure 31 is firmly installed on the tibial connection part 11 through the fastener 40 to prevent the two from being separated and affecting the limiting stop effect of the first limiting structure 31 on the support part 12.

[0039] Optionally, the fastener 40 is connected to both the tibial connection portion 11 and the tibia. In this way, the above arrangement can further improve the connection stability between the first limiting structure 31 and the tibial connection portion 11, so as to enhance the reliability of the unicompartmental knee prosthesis.

[0040] like Figure 1 , Figure 4 and Figure 5 As shown, the first limiting structure 31 includes a first protrusion 311, and the support portion 12 has a first recess 121. The first protrusion 311 extends into the first recess 121 to cooperate with the first recess 121, so that the first limiting structure 31 limits the support portion 12. In this way, the first protrusion 311 cooperates with the first recess 121 to achieve the limiting stop of the support portion 12 by the first limiting structure 31, so as to prevent the support portion 12 from tilting on the side with the first recess 121 and causing the support portion 12 to fall off from the tibial connecting portion 11. At the same time, the above structure is simple in structure and easy to process and realize.

[0041] Specifically, this embodiment is based on the basic requirements that can be realized clinically, and designs the first limiting structure 31 in a detachable manner. The first limiting structure 31 not only realizes the simple translational limiting of the supporting portion 12, but also, when the supporting portion 12 is tilted forward or backward, because the limiting height is sufficient and there is a corresponding first recess 121, the limiting function can be more fully and effectively exerted.

[0042] In other embodiments not shown in the drawings, the first limiting structure includes a third recess, the support portion has a third protrusion, the third protrusion extends into the third recess to cooperate with the third recess, so that the first limiting structure limits the support portion. In this way, the third protrusion cooperates with the third recess to achieve the first limiting structure to limit the support portion, so as to prevent the support portion from tilting on the side with the third protrusion and causing the support portion to fall off the tibial connection portion. At the same time, the above structure is simple in structure and easy to process and realize.

[0043] like Figure 3 As shown, the tibial connection part 11 has a through hole 111, and the first limiting structure 31 also includes a first body 312. The first protrusion 311 is connected to the first body 312 and is located at one end of the first body 312. The first body 312 is inserted into the through hole 111 so that the first protrusion 311 is located on the side of the tibial connection part 11 facing the support part 12. The other end of the first body 312 has a through hole for the fastener 40 to pass through. The fastener 40 passes through the through hole and is connected to the tibia. The above structure is simple in structure and easy to process and realize.

[0044] Specifically, after the support portion 12 is placed on the support portion 12, the first body 312 is passed through the through hole 111 so that the first protrusion 311 is arranged toward the support portion 12. Afterwards, the fastener 40 is passed through the through hole on the first body 312 and tightened on the tibia to install the first limiting structure 31 on the tibial connection portion 11.

[0045] like Figure 7 As shown, the first body 312 has a limiting step surface 312a, and the limiting step surface 312a and the surface of the tibial connection part 11 facing the support part 12 are limited and stopped, so that the first protrusion 311 and the first recess 121 are arranged correspondingly. In this way, when the first body 312 passes through the through hole 111, the limiting step surface 312a arranged on the first body 312 abuts against the tibial connection part 11 to achieve the positioning of the first protrusion 311, thereby ensuring that the first protrusion 311 can be limited and matched with the first recess 121, thereby ensuring the limiting reliability of the first limiting structure 31.

[0046] like Figures 1 to 4As shown, the second limiting structure 32 includes a second protrusion 321, and the support portion 12 has a second recess 122. The second protrusion 321 extends into the second recess 122 to cooperate with the second recess 122, so that the second limiting structure 32 limits the support portion 12. In this way, the second protrusion 321 cooperates with the second recess 122 to achieve the limit stop of the support portion 12 by the second limiting structure 32, so as to prevent the support portion 12 from tilting on the side with the second recess 122 and causing the support portion 12 to fall off from the tibial connecting portion 11. At the same time, the above structure is simple in structure and easy to process and realize.

[0047] In other embodiments not shown in the drawings, the second limiting structure includes a fourth recess, the support portion has a fourth protrusion, the fourth protrusion extends into the fourth recess to cooperate with the fourth recess, so that the second limiting structure limits the support portion. In this way, the fourth protrusion cooperates with the fourth recess to achieve the second limiting structure to limit the support portion, so as to prevent the support portion from tilting on the side with the fourth protrusion and causing the support portion to fall off the tibial connection portion. At the same time, the above structure is simple in structure and easy to process and realize.

[0048] like Figure 2 As shown, the second limiting structure 32 also includes a second body 322 connected to the second protrusion 321, and the second protrusion 321 is connected to the tibial connection part 11 through the second body 322. The second limiting structure 32 and the tibial connection part 11 are made by an integrated molding process. In this way, the above arrangement ensures that the second protrusion 321 can be arranged with the second recess 122, and further ensures that when the second protrusion 321 and the second recess 122 are limited and stopped, the support part 12 can be prevented from tilting and causing the support part 12 to fall off from the tibial connection part 11. In addition, the above structure is simple in structure and easy to process and realize.

[0049] In this embodiment, the first recess 121 is a first groove-shaped structure, and the second recess 122 is a second groove-shaped structure. The above structure is simple in structure, easy to process and realize, and reduces the processing cost of the support part 12.

[0050] In this embodiment, the first groove-shaped structure extends to the side of the support portion 12, and the second groove-shaped structure extends to the side of the support portion 12. In this way, the above arrangement makes the processing of the support portion 12 easier and simpler, and reduces the processing difficulty; on the other hand, it ensures that the first protrusion can extend into the first groove-shaped structure and the second protrusion can extend into the second groove-shaped structure, thereby improving the reliability of the limiting assembly 30 on the support portion 12.

[0051] like Figure 7 and Figure 8As shown, the first protrusion 311 has a first arc-shaped surface on the side facing the support portion 12, and the first groove-shaped structure is a first arc-shaped groove adapted to the first arc-shaped surface. In this way, after the first protrusion 311 extends into the first groove-shaped structure, the first protrusion 311 and the inner surface of the first groove-shaped structure can be engaged with each other to prevent the side of the support portion 12 having the first groove-shaped structure from tilting up and coming off the tibial connecting portion 11.

[0052] like Figure 1 and Figure 2 As shown, the second protrusion 321 has a second arc surface on the side facing the support portion 12, and the second groove-like structure is a second arc groove matched with the second arc surface. In this way, after the second protrusion 321 extends into the second groove-like structure, the second protrusion 321 and the inner surface of the second groove-like structure can be engaged with each other to prevent the side of the support portion 12 having the second groove-like structure from tilting up and coming off the tibial connecting portion 11.

[0053] like Figures 1 to 3 As shown, the limiting assembly 30 further includes a third limiting structure 33, which is located at one side of the support portion 12, and the first limiting structure 31 and the second limiting structure 32 are located at the side of the third limiting structure 33 facing the support portion 12. In this way, the third limiting structure 33 is located at one side of the support portion 12 to limit and stop the side of the support portion 12 to ensure that the support portion 12 moves in the tibial connecting portion 11.

[0054] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0055] During the movement of the tibia relative to the femur, the femoral condyle prosthesis slides along the surface of the support portion to meet the normal function of the knee joint. In the above process, at least two limiting structures are respectively located on both sides of the support portion to limit and stop the support portion, thereby preventing the support portion from coming off the tibial connection portion and affecting the reliability of the use of the unicompartmental knee prosthesis, thereby solving the problem of the support portion of the unicompartmental knee prosthesis in the prior art being easily dislodged, and improving the reliability of the use of the unicompartmental knee prosthesis. Among them, at least one of the at least two limiting structures is detachably connected to the tibial connection portion, and after the installation of the femoral condyle prosthesis is completed, at least one limiting structure detachably connected to the tibial connection portion is installed on the tibial connection portion to limit and stop the support portion.

[0056] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0057] 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.

[0058] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0059] 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 unicompartmental knee prosthesis, characterized in that: include: A tibial plateau prosthesis component (10) comprises a tibial connection portion (11) and a support portion (12) arranged on the tibial connection portion (11); A femoral condyle prosthesis (20) is arranged on the support portion (12), and a surface of the support portion (12) facing the femoral condyle prosthesis (20) has an arc-shaped sliding groove (123) that cooperates with the femoral condyle prosthesis (20); A limiting assembly (30) is arranged on the tibial connecting portion (11), the limiting assembly (30) comprising a plurality of limiting structures, at least two of the limiting structures being respectively located at the front and rear sides of the supporting portion (12) to limit and stop the supporting portion (12); The at least two limiting structures include a first limiting structure (31) and a second limiting structure (32), wherein the first limiting structure (31) is detachably connected to the tibial connecting portion (11); The limiting assembly (30) further comprises a third limiting structure (33), wherein the third limiting structure (33) is located on one side of the support portion (12), and the first limiting structure (31) and the second limiting structure (32) are located on a side of the third limiting structure (33) facing the support portion (12); The first limiting structure (31) comprises a first protrusion (311), the support portion (12) has a first recess (121), the first protrusion (311) extends into the first recess (121) to cooperate with the first recess (121), so that the first limiting structure (31) limits and stops the support portion (12); The second limiting structure (32) comprises a second protrusion (321), the support portion (12) has a second recess (122), and the second protrusion (321) extends into the second recess (122) to cooperate with the second recess (122), so that the second limiting structure (32) limits and stops the support portion (12).

2. The unicompartmental knee prosthesis according to claim 1, characterized in that: The unicompartmental knee prosthesis further comprises: A fastener (40), wherein the first limiting structure (31) is connected to the tibial connecting portion (11) and / or the tibia via the fastener (40).

3. The unicompartmental knee prosthesis according to claim 2, characterized in that: The tibial connecting portion (11) has a through hole (111), and the first limiting structure (31) further comprises: A first body (312), the first protrusion (311) is connected to the first body (312) and is located at one end of the first body (312), the first body (312) is inserted into the through hole (111) so that the first protrusion (311) is located on the side of the tibia connecting portion (11) facing the supporting portion (12), and the other end of the first body (312) has a through hole for the fastener (40) to pass through, and the fastener (40) is connected to the tibia after passing through the through hole.

4. The unicompartmental knee prosthesis according to claim 3, characterized in that: The first body (312) has a limiting step surface (312a), and the limiting step surface (312a) and the surface of the tibia connecting part (11) facing the supporting part (12) are limited and stopped, so that the first protrusion (311) and the first recess (121) are arranged correspondingly.

5. The unicompartmental knee prosthesis according to claim 1, characterized in that: The second limiting structure (32) further comprises a second body (322) connected to the second protrusion (321), and the second protrusion (321) is connected to the tibial connecting portion (11) via the second body (322); wherein the second limiting structure (32) and the tibial connecting portion (11) are manufactured using an integral molding process.

6. The unicompartmental knee prosthesis according to claim 1, characterized in that: The first recess (121) is a first groove-shaped structure, and / or the second recess (122) is a second groove-shaped structure.

7. The unicompartmental knee prosthesis according to claim 6, characterized in that: The first protrusion (311) has a first arc-shaped surface on one side facing the support portion (12), and the first groove-shaped structure is a first arc-shaped groove adapted to the first arc-shaped surface.

8. The unicompartmental knee prosthesis according to claim 6, characterized in that: The second protrusion (321) has a second arc-shaped surface on one side facing the support portion (12), and the second groove-shaped structure is a second arc-shaped groove adapted to the second arc-shaped surface.

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