CN216168111U

CN216168111U - Tibial plateau, tibial component and knee joint prosthesis

Info

Publication number: CN216168111U
Application number: CN202122476315.1U
Authority: CN
Inventors: 张峡; 胡森元; 马国强; 孟天宇; 董骧
Original assignee: Beijing Naton Medical Technology Holdings Co Ltd
Current assignee: Beijing Naton Medical Technology Holdings Co Ltd
Priority date: 2021-10-14
Filing date: 2021-10-14
Publication date: 2022-04-05
Anticipated expiration: 2031-10-14

Abstract

The utility model discloses a tibial plateau, a tibial component and a knee joint prosthesis, which belong to the technical field of orthopedic implants, wherein the inner side and/or the outer side of the tibial plateau are/is respectively provided with a porous structure for attaching an inner collateral ligament and an outer collateral ligament of a knee joint, and the pore diameter of the porous structure is 200-800 mu m. The porous structure is arranged on the inner side and/or the outer side of the tibial platform, so that the ligament can be attached to a bone below the tibial platform and can also be attached to the tibial platform, the attachment area of the ligament is increased, the ligament wrapping the femoral condyle is enhanced to a certain extent, the moment arm and moment of the ligament are reduced when the ligament is attached to the tibial platform from the femur, and the right-left shaking between the femoral condyle and the tibia is reduced under the same external force condition, so that the knee joint has good stability.

Description

Tibial plateau, tibial component and knee joint prosthesis

Technical Field

The utility model relates to the technical field of orthopedic implants, in particular to a tibial platform, a tibial component and a knee joint prosthesis.

Background

With the progress of social aging, the number of middle-aged and elderly people suffering from degenerative diseases of knee joints increases year by year, and severe arthralgia, deformity and motor dysfunction appear in the later period. Knee replacement is a main means for treating middle and late stage severe osteoarthropathy, can effectively relieve pain and rebuild joint function and mobility, and is widely applied clinically.

Knee prostheses typically include a femoral component and a tibial component, which typically includes a tibial plateau and a pad mounted on the tibial plateau. The inventor discovers at the research in-process, and the edge of the tibial plateau of traditional tibial component is mostly smooth solid, and the attached relatively poor of inboard collateral ligament and the outside collateral ligament of postoperative knee joint both sides, and inboard collateral ligament and outside collateral ligament can only be connected with the inferior bone of tibial plateau, consequently lack the effectual parcel of knee joint for the stability of knee joint is relatively poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a tibial platform, a tibial component and a knee joint prosthesis, wherein medial and lateral collateral ligaments on two sides of a knee joint are well attached after operation.

In order to solve the technical problems, the utility model provides the following technical scheme:

in one aspect, a tibial plateau is provided, wherein the medial and/or lateral side of the tibial plateau is provided with a porous structure for attaching the medial and lateral collateral ligaments of the knee joint, respectively, and the pore size of the porous structure is 200-.

Furthermore, the upper surface of the tibial plateau is provided with a clamping groove for accommodating a gasket, so that the edges of the inner side and the outer side of the tibial plateau form an arc-shaped vertical side wall, and the porous structure is positioned on the arc-shaped vertical side wall.

Further, the pore diameter of the porous structure is 600-700 μm, and/or the porosity of the porous structure is 70-90%.

Further, the pores of the porous structure are in a horizontal direction, and/or the inside of the porous structure is in a net structure.

Further, the height of the arc-shaped vertical side wall is 6-15 mm;

and/or the arc length of the arc-shaped vertical side wall is 30-50 mm;

and/or the thickness of the arc-shaped vertical side wall is 1-4 mm.

Furthermore, a U-shaped fixing part for fixing the medial collateral ligament or the lateral collateral ligament of the knee joint is arranged on the tibial platform corresponding to the porous structure.

Furthermore, inserting holes are formed in the front end and the rear end of the porous structure on the tibial platform, and the tail end of the U-shaped fixing piece is used as a plug pin to be inserted into the inserting holes;

or, the lower surface of the tibial platform is provided with inserting holes corresponding to the front end and the rear end of the porous structure, the tail end of the U-shaped fixing piece is provided with a pin bent upwards, and the pin is inserted in the inserting holes.

Furthermore, the middle of the pin is provided with a slot extending along the length direction of the pin so that the pin is divided into two sections, the outer surface of each section is provided with a barb, and a step surface matched with the barb and used for preventing the pin from withdrawing is arranged in the insertion hole.

In another aspect, a tibial component is provided, which includes a tibial platform and a pad mounted on the tibial platform, wherein the tibial platform is the tibial platform described above.

In another aspect, a knee joint prosthesis is provided, which includes a femoral component and a tibial component, wherein the tibial component is the tibial component described above.

The utility model has the following beneficial effects:

according to the tibial platform, the inner side and/or the outer side of the tibial platform are/is provided with the porous structures used for attaching the medial collateral ligament and the lateral collateral ligament of the knee joint, compared with the traditional tibial platform, the tibial platform is provided with the porous structures at the inner side and/or the outer side, so that the attachment of the ligaments is facilitated, the ligaments can be attached to bone below the tibial platform and can also be attached to the tibial platform, the attachment area of the ligaments is increased, the ligament wrapping femoral condyle is enhanced to a certain extent, the moment arm and moment of the ligaments are reduced when the ligaments are attached to the tibial platform from the thighbone than when the ligaments are attached to the tibia from the thighbone, and under the same external force condition, the left-right shaking between the femoral condyle and the tibia is reduced, so that the stability of the knee joint is better; the pore diameter of the porous structure is 200-800 μm, which is convenient for promoting the attachment of soft tissues such as ligaments and the like.

Drawings

FIG. 1 is a perspective view of a tibial plateau of the present invention;

FIG. 2 is a side view of the tibial plateau of the present invention;

fig. 3 is a front cross-sectional view of an improved embodiment of the tibial plateau of the present invention;

fig. 4 is a front cross-sectional view of another modified embodiment of the tibial plateau of the present invention;

FIG. 5 is a schematic top view of the embodiment of FIGS. 3 and 4;

fig. 6 is an enlarged partial view of the prongs of the U-shaped fastener and the insertion holes in the tibial plateau of the embodiment of fig. 3 and 4.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

In one aspect, the present invention provides a tibial platform 1, as shown in fig. 1-6, wherein the medial and/or lateral sides of the tibial platform 1 are provided with a porous structure 11 for attachment of the medial and lateral collateral ligaments of the knee joint, respectively, and the pore size of the porous structure 11 is 200 μm and 800 μm.

The terms "inner", "outer", "anterior", "posterior", "superior" and "inferior" in the present invention refer to the tibial plateau as a reference of the position of the human body after the tibial plateau is implanted into the human body.

According to the tibial platform, the inner side and/or the outer side of the tibial platform are/is provided with the porous structures used for attaching the medial collateral ligament and the lateral collateral ligament of the knee joint, compared with the traditional tibial platform, the tibial platform is provided with the porous structures at the inner side and/or the outer side, so that the attachment of the ligaments is facilitated, the ligaments can be attached to bone below the tibial platform and can also be attached to the tibial platform, the attachment area of the ligaments is increased, the ligament wrapping femoral condyle is enhanced to a certain extent, the moment arm and moment of the ligaments are reduced when the ligaments are attached to the tibial platform from the thighbone than when the ligaments are attached to the tibia from the thighbone, and under the same external force condition, the left-right shaking between the femoral condyle and the tibia is reduced, so that the stability of the knee joint is better; the pore diameter of the porous structure is 200-800 μm, which is convenient for promoting the attachment of soft tissues such as ligaments and the like. The utility model is mainly suitable for knee joint operation.

In the embodiment shown in fig. 1, the medial and lateral sides of the tibial plateau 1 are both provided with porous structures 11 for attaching the medial and lateral collateral ligaments of the knee joint, so that the medial and lateral collateral ligaments can be attached to the medial and lateral sides of the tibial plateau 1 at the same time, the femoral condyle can be wrapped better, and the left and right shake between the femoral condyle and the tibia can be reduced better under the same external force condition, so that the knee joint is more stable.

Research shows that, for the porous structure, no matter the material and the manufacturing method, as long as the pore diameter is larger than 200um, soft tissues can grow in. The pore size of the porous structure 11 may be 600-700 μm, preferably 700 μm, where the maximum revascularization inside the prosthesis is most beneficial for soft tissue ingrowth. The porosity of the porous structure 11 may be 70-90%, for example 80%, which is preferred. The porosity of the porous structure 11 is preferably horizontal, which is more conducive to soft tissue ingrowth. The interior of the porous structure 11 may be a mesh structure, which may improve the stability of the ligament after implantation.

As shown in fig. 1, in order to accommodate the pad conveniently, the upper surface of the tibial plateau 1 may be provided with a slot 12 for accommodating the pad, so that an arc-shaped vertical sidewall 13 is formed at the inner and outer side edges of the tibial plateau 1, and the porous structure 11 is located on the arc-shaped vertical sidewall 13. The height H of the curved vertical side wall 13 (i.e., the distance between the upper edge of the curved vertical side wall 13 to the lower surface of the tibial plateau 1) is preferably 6-15 mm. The arc length of the curved vertical side wall 13 is preferably 30-50 mm. The thickness of the curved vertical side wall 13 is preferably 1-4mm, for example 2mm, 3mm, etc.

It is contemplated that the tibial platform 1 may not be provided with the slot 12 for receiving the pad, but the pad may be directly fixed to the upper surface of the tibial platform 1 by a fastener, in which case the porous structure 11 may be directly located on the lateral surface of the tibial platform 1, and the thickness of the tibial platform 1 may be 6-15 mm.

In order to enhance the fixation firmness of the medial or lateral collateral ligament of the knee joint and to enable the medial or lateral collateral ligament to be better attached to the porous structure 11, the porous structure 11 may be provided with U-shaped fixation members 14, 14' for fixing the medial or lateral collateral ligament of the knee joint.

Depending on the design of the U-shaped fastening elements 14, 14', the utility model can be embodied in the following manner:

example 1

As shown in fig. 3 and 5-6, the porous structure 11 has insertion holes 15 at both front and rear ends, and the ends of the U-shaped fixing members 14 are inserted into the insertion holes 15 as pins 141. When the fixing device is used, the medial collateral ligament or the lateral collateral ligament is firstly attached to the porous structure 11, the U-shaped fixing piece 14 is sleeved on the medial collateral ligament or the lateral collateral ligament, and finally the tail end of the U-shaped fixing piece 14 is inserted into the insertion hole 15 to complete the fixation of the ligament.

Example 2

As shown in fig. 4 and 5-6, insertion holes 15 are formed in the lower surface of the tibial platform 1 corresponding to the front and rear ends of the porous structure 11, and the U-shaped fixing member 14 ' has a pin 141 ' bent upward at the end thereof, and the pin 141 ' is inserted into the insertion hole 15. When the fixing device is used, the medial collateral ligament or the lateral collateral ligament is firstly attached to the porous structure 11, and the pin 141 'at the tail end of the U-shaped fixing piece 14' is inserted into the insertion hole 15 to complete the fixation of the ligament.

In the above embodiment, as shown in fig. 6, in order to prevent the U-shaped fixing elements 14 and 14 'from falling off, the middle of the pins 141 and 141' may be provided with slots 1411 and 1411 'extending along the length direction of the pins 141 and 141' to divide the pins 141 and 141 'into left and right halves (where the left and right halves have certain elasticity), the outer surface of each of the left and right halves is provided with barbs 1412 and 1412', and the insertion hole 15 is provided with a stepped surface 151 which cooperates with the barbs 1412 and 1412 'to prevent the pins 141 and 141' from falling off. When the plug-in type U-shaped fixing piece is used, the pins 141 and 141 'are inserted into the plug-in hole 15, and after the pins 141 and 141' are inserted to a certain depth, the barbs 1412 and 1412 'on the outer surfaces of the pins 141 and 141' are matched with the stepped surfaces 151 in the plug-in hole 15 to prevent the pins 141 and 141 'from being withdrawn, so that the U-shaped fixing pieces 14 and 14' are prevented from falling off.

In another aspect, a tibial component is provided comprising a tibial platform 1 and a liner (not shown) mounted on the tibial platform 1, the tibial platform 1 being a tibial platform as described above. Since the structure of the tibial plateau is the same as above, it is not described in detail here.

The inner side and/or the outer side of the tibial platform of the tibial component are/is respectively provided with the porous structures for attaching the medial collateral ligament and the lateral collateral ligament of the knee joint, compared with the traditional tibial platform, the tibial platform is provided with the porous structures at the inner side and/or the outer side, so that the attachment of the ligaments is convenient, the ligaments can be attached to bone below the tibial platform and also can be attached to the tibial platform, the attachment area of the ligaments is increased, the ligament wrapping femoral condyle is enhanced to a certain degree, the moment arm and moment of the ligaments are reduced when the femur is attached to the tibial platform and are attached to the tibia, and the left-right shaking between the femoral condyle and the tibia is reduced under the same external force condition, so that the knee joint has better stability; the pore diameter of the porous structure is 200-800 μm, which is convenient for promoting the attachment of soft tissues such as ligaments and the like.

In another aspect, a knee joint prosthesis is provided, which includes a femoral component and a tibial component, wherein the tibial component is the tibial component. Since the structure of the tibial component is the same as above, it is not described in detail here.

According to the knee joint prosthesis, the inner side and/or the outer side of the tibial platform of the tibial component are/is respectively provided with the porous structures for attaching the medial collateral ligament and the lateral collateral ligament of the knee joint, compared with the traditional tibial platform, the tibial platform is provided with the porous structures at the inner side and/or the outer side, so that the attachment of the ligaments is facilitated, the ligaments can be attached to bone below the tibial platform and also can be attached to the tibial platform, the attachment area of the ligaments is increased, the ligament wrapping femoral condyle is enhanced to a certain extent, the moment arm and moment of the ligaments are reduced when the femur is attached to the tibial platform and compared with the ligaments attached to the tibia, and under the same external force condition, the left-right shaking between the femoral condyle and the tibia is reduced, so that the stability of the knee joint is better; the pore diameter of the porous structure is 200-800 μm, which is convenient for promoting the attachment of soft tissues such as ligaments and the like.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims

1. Tibial plateau, characterized in that the medial and/or lateral side of the tibial plateau is provided with a porous structure for attachment of the medial and lateral collateral ligaments of the knee joint, respectively, the pore size of the porous structure being 200-800 μm.

2. The tibial plateau of claim 1 wherein the upper surface of the tibial plateau is provided with a slot for receiving a liner, thereby forming arcuate vertical side walls at the medial and lateral edges of the tibial plateau, the porous structure being located on the arcuate vertical side walls.

3. The tibial plateau of claim 1 wherein the pore size of said porous structure is 600-700 μm and/or the porosity of said porous structure is 70-90%.

4. The tibial plateau of claim 1, wherein the pores of the porous structure are horizontally oriented and/or the interior of the porous structure is a reticulated structure.

5. The tibial plateau of claim 2, wherein the height of the curved vertical sidewall is 6-15 mm;

and/or the arc length of the arc-shaped vertical side wall is 30-50 mm;

and/or the thickness of the arc-shaped vertical side wall is 1-4 mm.

6. A tibial plateau according to any one of claims 1 to 5, wherein a U-shaped fixing element is provided on the tibial plateau, corresponding to the porous structure, for fixing the medial or lateral collateral ligament of the knee joint.

7. The tibial plateau of claim 6, wherein insertion holes are formed in the tibial plateau at both the front and rear ends of the porous structure, and the ends of the U-shaped fixing member are inserted into the insertion holes as pins;

8. The tibial plateau of claim 7 wherein said pin has a slot extending along the length of said pin to divide said pin into two halves, each having a barb on the outer surface, said socket having a stepped surface therein for engaging said barb to prevent withdrawal of said pin.

9. A tibial component comprising a tibial platform and a liner mounted on the tibial platform, wherein the tibial platform is as claimed in any of claims 1 to 8.

10. A knee prosthesis comprising a femoral component and a tibial component, wherein the tibial component is the tibial component of claim 9.