Knee prosthesis

Abstract

The present invention provides a knee joint prosthesis, comprising: a tibial plateau; a femoral condyle component located above the tibial plateau; a gasket component located between the tibial plateau and the femoral condyle component, the gasket component comprising a medial gasket and a lateral gasket; a sliding mechanism located between the tibial plateau and the gasket component, the sliding mechanism comprising an arcuate rib and a plurality of arcuate slots, or comprising a plurality of arcuate ribs and a plurality of arcuate slots, or comprising a plurality of arcuate ribs and a plurality of arcuate slots, one of the arcuate ribs and the arcuate slots being arranged on the tibial plateau, the other being arranged on the lateral gasket, when there are a plurality of arcuate ribs, the plurality of arcuate ribs are arranged concentrically, the arcuate slots can cooperate with different arcuate ribs, when there are a plurality of arcuate slots, the plurality of arcuate slots are arranged concentrically, the arcuate ribs can cooperate with different arcuate slots. The technical solution of the present application effectively solves the problem of poor effect of knee joint prosthesis in the related art.

Description

Technical Field

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

[0002] Artificial knee replacement is to use artificial material interface to replace the worn or diseased knee joint surface, with the purpose of eliminating the patient's pain, correcting joint deformity, and restoring the patient's functional activities. Knee joint movement is a complex movement process. During flexion, the femoral condyle not only slides on the tibial platform, but also rolls and rotates, which is specifically manifested as medial condyle external rotation and lateral condyle backward rolling.

[0003] In the related art, the knee joint prosthesis can achieve the sliding of the femoral condyle on the tibial platform. When the above-mentioned knee joint prosthesis is used for replacement surgery, the patient is prone to motor dysfunction. 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 effect of knee joint prosthesis in the related art.

[0005] 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; a femoral condyle component, located above the tibial plateau; a gasket component, the gasket component is located between the tibial plateau and the femoral condyle component, the gasket component comprising an inner gasket and an outer gasket; a sliding mechanism, the sliding mechanism is located between the tibial plateau and the gasket component, the sliding mechanism comprises an arcuate rib and a plurality of arcuate grooves, or the sliding mechanism comprises a plurality of arcuate ribs and a plurality of arcuate grooves, or the sliding mechanism comprises a plurality of arcuate ribs and a plurality of arcuate grooves, one of the arcuate ribs and the arcuate groove is arranged on the tibial plateau, and the other is arranged on the outer gasket, when there are a plurality of arcuate ribs, the plurality of arcuate ribs are concentrically arranged, and the arcuate grooves can cooperate with different arcuate ribs, when there are a plurality of arcuate grooves, the plurality of arcuate grooves are concentrically arranged, and the arcuate ribs can cooperate with different arcuate grooves.

[0006] Furthermore, the sliding mechanism also includes an avoidance groove, which is located on at least one side of the arc-shaped sliding groove, and the width of the avoidance groove is greater than the width of the arc-shaped sliding groove.

[0007] Furthermore, a first limiting portion is arranged on the arc-shaped slide groove, a second limiting portion cooperating with the first limiting portion is arranged on the arc-shaped rib, and the first limiting portion stops the second limiting portion.

[0008] Furthermore, in a direction from close to the inner gasket to far away from the inner gasket, the arc lengths of the plurality of arc-shaped ribs or the plurality of arc-shaped sliding grooves gradually increase.

[0009] Furthermore, at least one end of the arcuate slide groove is a first opening end, and at least one end of the avoidance groove is a second opening end. When the arcuate slide groove has a first opening end and the avoidance groove has a second opening end, the first opening end and the second opening end are on the same side.

[0010] Furthermore, a blocking portion is provided on the tibial platform, and a part of the structure of the medial gasket is installed inside the blocking portion.

[0011] Furthermore, the side portion of the surrounding portion on the tibial plateau is a plane portion, and the outer gasket is installed on the plane portion.

[0012] Furthermore, the enclosure portion includes a recess, and a partial structure of the outer gasket is located in the recess.

[0013] Furthermore, the planar portion is a polished surface.

[0014] Furthermore, the tibial platform also includes a mounting platform, a positioning column and an anti-rotation wing, and the anti-rotation wing is connected to the mounting platform and the positioning column.

[0015] According to the technical solution of the present invention, a sliding mechanism is provided between the tibial plateau and the lateral gasket, and the sliding mechanism includes an arcuate rib and a plurality of arcuate grooves, or the sliding mechanism includes a plurality of arcuate ribs and a plurality of arcuate grooves, or the sliding mechanism includes a plurality of arcuate ribs and a plurality of arcuate grooves. One of the arcuate ribs and the arcuate groove is provided on the tibial plateau, and the other is provided on the lateral gasket. When there are a plurality of arcuate ribs, the plurality of arcuate ribs are concentrically provided, and the arcuate groove can cooperate with different arcuate ribs. When there are a plurality of arcuate grooves, the plurality of arcuate grooves are concentrically provided, and the arcuate ribs can cooperate with different arcuate grooves. Doctors can select arcuate ribs and arcuate grooves in appropriate positions according to the different bone sizes of patients. Specifically, doctors can adjust the arcuate ribs to match different arcuate grooves or the arcuate grooves to match different arcuate ribs to change the size of the gasket component (i.e., the distance between the outer gasket and the inner gasket) so that the contact area between the femoral condyle component and the gasket component is larger, so that the knee joint prosthesis is more suitable for the patient, and thus the effect of the knee joint prosthesis can be better. Therefore, the technical solution of the present application can effectively solve the problem of poor effect of knee joint prosthesis 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 a knee joint prosthesis according to a first embodiment of the present invention is shown;

[0018] Figure 2 Shows Figure 1 A schematic diagram of the three-dimensional structure of the tibial plateau and the spacer components of the knee joint prosthesis;

[0019] Figure 3 Shows Figure 1 Schematic diagram of the three-dimensional structure of the tibial plateau and medial gasket of the knee joint prosthesis;

[0020] Figure 4 Shows Figure 1 Schematic diagram of the three-dimensional structure of the tibial plateau and the lateral gasket of the knee joint prosthesis;

[0021] Figure 5 Shows Figure 1 A schematic diagram of the three-dimensional structure of the lateral gasket of a knee joint prosthesis;

[0022] Figure 6 Shows Figure 5 A bottom view of the outer gasket;

[0023] Figure 7 A bottom view schematically shows a lateral gasket of a second embodiment of a knee joint prosthesis according to the present invention; and

[0024] Figure 8 A bottom view schematically shows the lateral gasket of the third embodiment of the knee joint prosthesis according to the present invention.

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

[0026] 10. tibial plateau; 11. enclosure; 111. recess; 112. notch; 12. plane portion; 13. mounting platform; 14. positioning column; 15. anti-rotation wing; 20. femoral condyle component; 30. gasket component; 31. medial gasket; 32. lateral gasket; 40. sliding mechanism; 41. arc-shaped ribs; 411. second limiting portion; 42. arc-shaped slide groove; 421. first limiting portion; 422. first opening end; 43. avoidance groove; 431. second opening end. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] 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.

[0030] In order to make the knee prosthesis more adaptable to the patient and achieve better postoperative results, considering the different bone sizes of different patients, such as Figures 1 to 4 As shown, in the first embodiment, the knee joint prosthesis includes: a tibial plateau 10, a femoral condyle component 20, a gasket component 30 and a sliding mechanism 40. The femoral condyle component 20 is located above the tibial plateau 10; the gasket component 30 is located between the tibial plateau 10 and the femoral condyle component 20, and the gasket component 30 includes a medial gasket 31 and a lateral gasket 32; the sliding mechanism 40 is located between the tibial plateau 10 and the gasket component 30, and the sliding mechanism 40 includes an arcuate groove 42 and a plurality of arcuate ribs 41, the arcuate rib 41 is arranged on the tibial plateau 10, the arcuate groove 42 is arranged on the lateral gasket 32, and the plurality of arcuate ribs 41 are arranged concentrically, and the arcuate groove 42 can cooperate with different arcuate ribs 41.

[0031] According to the technical solution of the first embodiment, the femoral condyle component 20 is installed above the tibial plateau 10, and the gasket component 30 includes a medial gasket 31 and a lateral gasket 32. The medial gasket 31 and the lateral gasket 32 ​​are installed between the femoral condyle component 20 and the tibial plateau 10. A sliding mechanism 40 is arranged between the tibial plateau 10 and the lateral gasket 32. The sliding mechanism 40 includes a plurality of arcuate ribs 41 and an arcuate groove 42. The arcuate ribs 41 are arranged on the tibial plateau 10, and the arcuate groove 42 is arranged on the lateral gasket 32. The plurality of arcuate ribs 41 are arranged concentrically, and the arcuate ribs 41 can cooperate with different arcuate grooves 42. The doctor can select the arcuate rib 41 and the arcuate slot 42 in the appropriate position according to the different sizes of the patient's bones. Specifically, the doctor can adjust the arcuate rib 41 and the arcuate slot 42 to change the distance between the outer gasket 32 ​​and the inner gasket 31, so that the contact area between the femoral condyle component 20 and the gasket component 30 is larger, so that the knee joint prosthesis is more suitable for the patient, and the effect of the knee joint prosthesis is better. Therefore, the technical solution of the present application can effectively solve the problem of poor effect of the knee joint prosthesis in the related art.

[0032] In an embodiment not shown in the figure, the sliding mechanism includes an arcuate rib and a plurality of arcuate slots. In this case, one of the arcuate slot and the arcuate rib is arranged on the tibial platform, and the other is arranged on the outer gasket. The plurality of arcuate slots are arranged concentrically, and the arcuate rib can be selectively matched with one of the plurality of arcuate slots, so that the size of the gasket component is adjustable, that is, the distance between the inner gasket and the outer gasket is adjustable. When the doctor performs the operation, the arcuate slot in the appropriate position can be selected according to the patient's bone size, so that the contact area between the femoral condyle component and the gasket component is larger, so as to improve the patient's postoperative effect.

[0033] Of course, the sliding mechanism can also include multiple arc ribs and multiple arc chute, for example, four arc ribs and two arc chute, or other number of arc ribs and arc chute. Multiple arc ribs are concentrically arranged, and multiple arc chute is concentrically arranged. When four arc ribs and two arc chute are provided, the two arc chute can cooperate with two arc ribs at the same time. When the doctor performs the operation, the two outermost arc ribs can be selected to cooperate with the arc chute, the two middle arc ribs can be selected to cooperate with the arc chute, and the two innermost arc ribs can be selected to cooperate with the arc chute. This setting can increase the connection strength between the arc rib and the arc chute, and prevent the arc chute or the arc rib from being damaged and causing the outer gasket to be separated from the tibial platform. Of course, the number of arc ribs and arc chute can also be equal. In the above structure, the outer side refers to the direction away from the inner gasket, and the inner side refers to the direction close to the inner gasket.

[0034] To avoid interference between the arc ribs and the outer gasket, Figures 4 to 6 As shown, in the first embodiment, the sliding mechanism 40 further includes an avoidance groove 43, which is located on one side of the arc-shaped slide groove 42, and the width of the avoidance groove 43 is greater than the width of the arc-shaped slide groove 42. The arc-shaped rib 41 not installed in the arc-shaped slide groove 42 can be installed in the avoidance groove 43, and because the width of the avoidance groove 43 is large, the arc-shaped rib 41 not installed in the arc-shaped slide groove 42 can be prevented from interfering with or colliding with the outer gasket 32.

[0035] like Figure 2 As shown, in the first embodiment, the avoidance groove 43 is located on the right side of the arcuate groove 42, and the arcuate groove 42 can only cooperate with the arcuate rib 41 on the leftmost side of the tibial plateau 10. The above arrangement can achieve the avoidance function while making the structural strength of the arcuate groove 42 better, and can prevent the arcuate groove 42 from being broken and damaged, which affects the use of the knee joint prosthesis.

[0036] like Figures 3 to 5 As shown, in the first embodiment, the arc-shaped slide groove 42 is provided with a first limiting portion 421, and the arc-shaped rib 41 is provided with a second limiting portion 411 cooperating with the first limiting portion 421, and the first limiting portion 421 stops the second limiting portion 411. The first limiting portion 421 and the second limiting portion 411 have simple structures and are easy to set up. At the same time, the first limiting portion 421 and the second limiting portion 411 have a good stopping and matching effect, which can prevent the second limiting portion 411 from separating from the first limiting portion 421. In this embodiment, the cross-section of the arc-shaped rib 41 is a trapezoidal structure, and accordingly, the arc-shaped slide groove 42 is a dovetail groove. The first limiting portion 421 is a limiting inclined surface at the notch of the dovetail groove, and the second limiting portion 411 is a limiting inclined surface of a trapezoidal structure.

[0037] In an embodiment not shown in the figure, the cross section of the arcuate rib can also be circular, semicircular, T-shaped or other irregular shapes. The cross section of the arcuate rib only needs to include a portion with a smaller width close to the tibial plateau. The shape of the arcuate chute needs to be compatible with the arcuate rib.

[0038] like Figure 3 As shown, in the first embodiment, the arc lengths of the plurality of arcuate ribs 41 and the plurality of arcuate chute 42 gradually increase from the direction close to the medial gasket 31 to the direction away from the medial gasket 31. There are three arcuate ribs, and the arc length of the arcuate rib 41 close to the tibial plateau 10 is the smallest, and the arc length away from the tibial plateau 10 is the largest. The above structure can better adapt to the movement trajectory of the lateral gasket on the tibial plateau, so that the lateral gasket is not easily separated from the tibial plateau. The arcuate chute can cooperate with the above three arcuate ribs respectively.

[0039] like Figures 4 to 6As shown, in the first embodiment, one end of the arc-shaped slide groove 42 is a first open end 422, and one end of the avoidance groove 43 is a second open end 431, and the first open end 422 and the second open end 431 are located on the same side of the outer gasket. The first open end 422 and the second open end 431 are located on the same side, so that the arc-shaped rib 41 is easy to install in the arc-shaped slide groove 42 and the avoidance groove 43.

[0040] Of course, in an embodiment not shown in the figure, one of the arcuate slide groove and the avoidance groove can be set as a through groove, or both the arcuate slide groove and the avoidance groove can be set as through grooves. In this case, there must be a first opening end and a second opening end on the same side, so that the arcuate ribs can be easily installed in the arcuate slide groove and the avoidance groove.

[0041] like Figure 4 As shown, in the first embodiment, a retaining portion 11 is provided on the tibial plateau 10, and part of the structure of the medial gasket 31 is installed inside the retaining portion 11. The medial gasket 31 includes a base and a protrusion located at the bottom of the base, the protrusion is located inside the retaining portion 11, and the outer wall of the base is flush with the outer wall of the retaining portion 11. The protrusion can limit the medial gasket 31 in the retaining portion 11, and the size of the base is the same as the size of the retaining portion, so that the contact area between the medial gasket 31 and the femoral condyle component 20 can be larger, thereby making the movement of the knee joint prosthesis more stable. At the same time, a convex block is provided on the protrusion, and a notch 112 is provided in the retaining portion 11. The notch 112 is plugged and matched with the protrusion, which further makes the medial gasket 31 more stable. The setting of the retaining portion 11 can effectively limit the movement of the medial gasket 31 and prevent it from detaching from the tibial plateau 10.

[0042] like Figure 4 As shown, in the first embodiment, the side of the retaining portion 11 on the tibial plateau 10 is a plane portion 12, and the lateral gasket 32 ​​is installed on the plane portion 12. There is no retaining structure on the plane portion 12, and the lateral gasket 32 ​​can move on the plane portion 12, so that the femoral condyle component 20 can rotate.

[0043] like Figure 4 As shown, in the first embodiment, the enclosure portion 11 includes a recess 111, and part of the structure of the outer gasket 32 ​​is located in the recess 111. The recess 111 can limit the rotation of the outer gasket 32. When the outer gasket 32 ​​rotates excessively, the protrusions on both sides of the recess 111 can limit the outer gasket 32. At the same time, due to the setting of the recess 111, the outer gasket 32 ​​can only move inside the plane portion 12, which can effectively avoid the outer gasket 32 ​​from interfering with other structures when it is rotated out, and prevent it from causing damage to the bone structure of the human body. In addition, the structure of the recess 111 is simple and easy to set.

[0044] like Figure 3As shown, in the first embodiment, the plane portion 12 is a polished surface. The polished surface can effectively reduce friction and reduce wear between the tibial plateau 10 and the lateral gasket 32.

[0045] like Figures 1 to 6 As shown, in embodiment one, the tibial plateau 10 also includes a mounting platform 13, a positioning column 14 and an anti-rotation wing 15, and the anti-rotation wing 15 is connected to the mounting platform 13 and the positioning column 14. The anti-rotation wing 15 can prevent the tibial plateau 10 from moving or rotating after installation, and the anti-rotation wing 15 can also support the mounting platform 13, thereby achieving a good fixation effect of the tibial plateau 10 and facilitating a good surgical effect for the patient. In this embodiment, there are two anti-rotation wings 15. Of course, in other embodiments, the anti-rotation wings can also be three, four or more. The positioning column 14 is conducive to mechanical conduction.

[0046] like Figures 1 to 6 As shown, during the activity of the knee joint prosthesis from extension to flexion, relative to the tibial plateau 10, the medial condyle joint rotates externally (axial displacement) and the lateral condyle joint rolls backward. The medial gasket 31 is a fixed gasket, and the articular surface of the medial gasket 31 and the articular surface of the medial condyle joint form a "ball-to-socket" kinematic pair, and the medial condyle joint can rotate externally (axial displacement) during flexion; the lateral gasket 32 ​​is a movable gasket, and the arcuate rib 41 cooperates with the arcuate chute 42. During flexion, the articular surface of the lateral gasket 32 ​​cooperates with the articular surface of the lateral condyle joint and rotates around the arcuate rib 41 to achieve backward rolling. One side of the medial gasket 31 is an articular surface that cooperates with the medial condyle joint, and one side is designed with a locking surface that cooperates with the inner side of the tibial plateau 10; one side of the lateral gasket 32 ​​is an articular surface that cooperates with the lateral condyle joint, and one side is designed with an arcuate rib 41 that cooperates with the arcuate chute 42. The interior of the enclosure 11 is a locking groove, the outer side of the enclosure 11 is designed as a polished movable surface, and the back of the polished movable surface is designed with a positioning column 14 and two anti-rotation wings 15. The material of the gasket component 30 of this embodiment is polyethylene.

[0047] Figure 7 The structure of the second embodiment of the knee joint prosthesis according to the present application is shown. The difference between the second embodiment and the first embodiment is that two avoidance grooves 43 are provided in the second embodiment. Figure 7 In the second embodiment, this arrangement can facilitate the matching of the arc-shaped slide groove 42 and the arc-shaped rib 41, and can match with any arc-shaped rib 41 without interfering with unmatched arc-shaped ribs.

[0048] Figure 8 The structure of the third embodiment of the knee joint prosthesis according to the present application is shown. The difference between the third embodiment and the first embodiment is that the position of the avoidance groove is as follows: Figure 8In the third embodiment, the avoidance groove 43 is arranged on the left side of the arc-shaped slide groove 42, and the arc-shaped slide groove 42 can cooperate with the arc-shaped rib 41 on the rightmost side, and its effect is similar to that of the technical solution of the first embodiment.

[0049] It should be noted that, in other embodiments, the knee joint prosthesis may include multiple outer gaskets, preferably, one outer gasket has the same structure as the outer gasket in Example 1, another outer gasket has the same structure as the outer gasket in Example 2, and another outer gasket has the same structure as the outer gasket in Example 3. The above structure increases the flexibility of the use of the outer gasket, thereby making it more convenient during use.

[0050] The knee joint prosthesis of the present application is provided with multiple arc-shaped slide grooves with different centers, which can cooperate with different lateral gaskets to achieve different movement centers of the femoral condyle component. The knee joint prosthesis of the present application conforms to the physiological kinematic characteristics of the human body, can improve the patient's postoperative satisfaction, and prolong the service life of the knee joint prosthesis.

[0051] In the related art, a retaining portion is provided on the tibial platform, and both the medial gasket and the lateral gasket are provided in the retaining portion. This setting is to prevent the lateral gasket from slipping out of the tibial platform socket and dislocating when the knee joint prosthesis is flexed. However, this design easily causes the lateral gasket to deform, and the matching degree with the femoral condyle component is reduced. At the same time, an active interface between the gasket side and the retaining portion is added, which increases the wear of the gasket. The technical solution of the present application cancels the retaining portion of the lateral gasket, which can effectively avoid the above-mentioned shortcomings. At the same time, in the related art, a longitudinal ridge is provided at the upper end of the tibial platform to separate the medial and lateral platforms of the tibial platform. However, when the setting is extremely active, the femoral condyle component and the tibial platform collide, forming metal-to-metal contact, generating more metal ions, and thus affecting the surgical effect of the patient. The technical solution of the present application cancels the separating longitudinal ridge, and the supporting capacity of the gasket component can be improved by this setting, and the contact between the femoral condyle component and the tibial platform can be avoided at the same time.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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 femoral condyle component (20) located above the tibial platform (10); A gasket component (30), the gasket component (30) being located between the tibial plateau (10) and the femoral condyle component (20), the gasket component (30) comprising a medial gasket (31) and a lateral gasket (32); A sliding mechanism (40), the sliding mechanism (40) being located between the tibial platform (10) and the gasket component (30), the sliding mechanism (40) comprising an arcuate rib (41) and a plurality of arcuate grooves (42), or the sliding mechanism (40) comprising a plurality of arcuate ribs (41) and an arcuate groove (42), or the sliding mechanism (40) comprising a plurality of arcuate ribs (41) and a plurality of arcuate grooves (42), One of the arcuate rib (41) and the arcuate groove (42) is arranged on the tibial platform (10), and the other is arranged on the outer gasket (32); when there are multiple arcuate ribs (41), the multiple arcuate ribs (41) are concentrically arranged, and the arcuate groove (42) can cooperate with different arcuate ribs (41); when there are multiple arcuate grooves (42), the multiple arcuate grooves (42) are concentrically arranged, and the arcuate rib (41) can cooperate with different arcuate grooves (42); The sliding mechanism (40) further comprises an avoidance groove (43), wherein the avoidance groove (43) is located on at least one side of the arc-shaped sliding groove (42), and the width of the avoidance groove (43) is greater than the width of the arc-shaped sliding groove (42); The tibial platform (10) is provided with a retaining portion (11), and a part of the structure of the inner gasket (31) is installed inside the retaining portion (11); The side portion of the enclosure portion (11) on the tibial platform (10) is a plane portion (12), the outer gasket (32) is mounted on the plane portion (12), and the plane portion (12) has no enclosure structure; The enclosure portion (11) comprises a recessed portion (111), and a partial structure of the outer gasket (32) is located in the recessed portion (111).

2. The knee joint prosthesis according to claim 1, characterized in that: The arc-shaped sliding groove (42) is provided with a first limiting portion (421), the arc-shaped rib (41) is provided with a second limiting portion (411) cooperating with the first limiting portion (421), and the first limiting portion (421) blocks the second limiting portion (411).

3. The knee joint prosthesis according to claim 1, characterized in that: In a direction from close to the inner gasket (31) to away from the inner gasket (31), the arc lengths of the plurality of arc-shaped ribs (41) or the plurality of arc-shaped sliding grooves (42) gradually increase.

4. The knee joint prosthesis according to claim 1, characterized in that: At least one end of the arc-shaped slide groove (42) is a first opening end (422), and at least one end of the avoidance groove (43) is a second opening end (431). When the arc-shaped slide groove (42) has a first opening end (422) and the avoidance groove (43) has a second opening end (431), the first opening end (422) and the second opening end (431) are located on the same side.

5. The knee joint prosthesis according to claim 1, characterized in that: The plane portion (12) is a polished surface.

6. The knee joint prosthesis according to claim 1, characterized in that: The tibial platform (10) further comprises a mounting platform (13), a positioning column (14) and an anti-rotation wing (15), wherein the anti-rotation wing (15) is connected to the mounting platform (13) and the positioning column (14).

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