CN216535675U - Biological knee joint prosthesis - Google Patents

Abstract

The present invention relates to a biotype knee joint prosthesis, comprising: the femoral condyle prosthesis is used for being connected with the femur of a human body; the tibia platform support is used for being connected with the tibia of a human body; and a liner positioned between the femoral condyle prosthesis and the tibial plateau support; the femoral condyle prosthesis includes an inner surface for attachment to a femur of a human body and an outer surface opposite the inner surface for attachment to a liner, wherein the inner surface of the femoral condyle and the bottom surface of the tibial plateau support are provided with a porous structural layer and the outer surface is provided with a friction reducing layer configured to reduce a coefficient of friction of the outer surface. The biological knee joint prosthesis can improve the stability of prosthesis fixation, reduce the abrasion of the femoral condyle and the platform pad, and prolong the whole service life of the implant.

Description

Biological knee joint prosthesis

Technical Field

The utility model belongs to the field of medical prosthesis design, and particularly relates to a biological knee joint prosthesis.

Background

Knee prostheses are surgical implants used to replace the knee, which are used in resurfacing surgery of the knee, treating a damaged knee and replacing it with a knee prosthesis. Currently, knee prostheses are widely used in joint replacement surgery. However, for knee replacement surgery, whether the knee prosthesis can be stably and firmly matched in the body of a patient is crucial to the success of the surgery, and can also reduce the pain of the patient after the surgery and reduce the possibility of revision after the surgery. The existing knee joint prosthesis mainly comprises: the tibial platform comprises a femoral condyle prosthesis used for being connected with the femur of a human body, a tibial platform support used for being connected with the tibia of the human body, and a gasket positioned between the femoral condyle prosthesis and the tibial platform support. However, the fixation between the femoral condyle prosthesis and the femur of the human body and the fixation between the tibial plateau tray and the tibia of the human body in the knee joint prosthesis are not ideal, and the fixation between the knee joint prosthesis and the bone tissue of the human body is easily loosened.

SUMMERY OF THE UTILITY MODEL

In order to solve all or part of the above problems, the present invention is directed to a bio-type knee joint prosthesis to improve stability of prosthesis fixation.

The present application provides a biotype knee prosthesis comprising: the femoral condyle prosthesis is used for being connected with the femur of a human body; the tibia platform support is used for being connected with a tibia of a human body; and a liner positioned between the femoral condyle prosthesis and the tibial plateau support; the femoral condyle prosthesis includes an inner surface for attachment to a femur of a human body and an outer surface opposite the inner surface for attachment to a liner, wherein the inner surface of the femoral condyle and the bottom surface of the tibial plateau support are provided with a porous structural layer and the outer surface is provided with a friction reducing layer configured to reduce a coefficient of friction of the outer surface.

Further, the friction reducing layer is configured as an amorphous carbon thin film layer.

Further, the inner surface includes an anterior condyle connecting surface and a posterior condyle connecting surface, wherein a thickness of the porous structural layer on a surface of the anterior condyle connecting surface and the posterior condyle connecting surface is greater than a thickness of the porous structural layer of the other portion of the inner surface in a range of 0.2mm to 0.5 mm.

Further, the tibial plateau tray comprises a platform part and a connecting part, and the platform part is used for being connected with the gasket; the connecting part is vertically connected with the platform part and is used for being connected with the tibia, the connecting part comprises a connecting column, the connecting column is used for being inserted into a bone cavity of the tibia of a human body to be connected, and a porous structure layer is arranged on the outer surface of the connecting column.

Further, the connecting columns are configured as solid columns of hexagonal cross-section.

Further, the diameter size of the circumscribed circle of the hexagonal cross-section ranges from 5mm to 10 mm.

Further, the connecting part also comprises two connecting wings positioned on the two tables of the connecting column.

Furthermore, the materials of the femoral condyle prosthesis, the tibial plateau support and the porous structure layer are titanium alloy, and the material of the liner is ultrahigh molecular weight polyethylene.

Compared with the prior art, the biological knee joint prosthesis has the following advantages:

on the one hand, the pores formed by the mutual staggered connection of the silk diameters are communicated with each other, the diameter size structures of the pores are inconsistent, the diameters of the pores of the porous structure layer and the range of the porosity are specifically set, so that the structure of the porous structure layer is closer to the bone trabecula structure of a human body, the porous structure layer with higher porosity and connectivity can well induce bone ingrowth, and the bone of the human body can quickly and naturally grow into the pores of the porous structure layer, thereby improving the adhesion, proliferation and differentiation capabilities of osteoblasts, effectively promoting the ingrowth and crawling of ilium bone, further being beneficial to the rapid fusion and fixation of the biological knee joint prosthesis and the bone of the knee joint of the human body after operation, and effectively improving the postoperative recovery effect of a patient.

In a second aspect, the outer surface is provided with a friction reducing layer, which may be configured as an amorphous carbon thin film layer. Through this setting, the surface of thighbone condyle prosthesis in this application can have higher wearability and corrosivity through setting up amorphous carbon film layer, and the coefficient of friction that reduces simultaneously can also reduce because of long-time use and the wearing and tearing that cause the lining pad to can improve the whole life of biotype knee joint prosthesis in the postoperative effectively.

Drawings

FIG. 1 is a schematic view of the attachment of a biotype knee prosthesis according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of the femoral condyle prosthesis shown in FIG. 1;

fig. 3 is a schematic structural view of the tibial plateau tray shown in fig. 1;

fig. 4 is another view of the tibial plateau tray of fig. 1 in a schematic configuration.

Detailed Description

For better understanding of the objects, structure and function of the present invention, a biotype knee prosthesis according to the present invention will be described in further detail with reference to the accompanying drawings.

FIG. 1 is a schematic view of the attachment of a biotype knee prosthesis according to an embodiment of the present invention; FIG. 2 is a schematic structural view of the femoral condyle prosthesis shown in FIG. 1; fig. 3 is a schematic structural view of the tibial plateau tray shown in fig. 1; fig. 4 is another schematic view of the tibial plateau tray of fig. 1. Referring to fig. 1 to 4, the present application provides a biotype knee prosthesis 100 including: a femoral condyle prosthesis 1 for connecting with a femur of a human body; the tibia platform support 2 is used for being connected with the tibia of a human body; and a pad 3 located between the femoral condyle prosthesis 1 and the tibial plateau support 2; the femoral condylar prosthesis 1 comprises an inner surface 11 for attachment to a femur of a human body and an outer surface 12 opposite the inner surface 11, the outer surface 12 being for attachment to the insert 3, wherein the inner surface 11 and/or a surface of the tibial plateau tray 2 is provided with the porous structural layer 4, the outer surface 12 is provided with a friction reducing layer 5 (shown in phantom in fig. 2), the friction reducing layer 5 being configured to reduce the coefficient of friction of the outer surface 12.

When the biological knee joint prosthesis 100 of the embodiment of the utility model is used, the femoral condyle prosthesis 1 is connected with the femur of a human body, the porous structure layer 4 arranged on the inner surface 11 of the femoral condyle prosthesis 1 is jointed and connected with the surface of the femur of the human body, the tibial plateau support 2 is connected with the tibia of the human body, and the porous structure layer 4 arranged on the surface of the tibial plateau support 2 is jointed with the surface of the tibia of the human body. The pad 3 is located between the femoral condyle prosthesis 1 and the tibial plateau tray 2.

In a first aspect of the present application, the inner surface 11 and/or the surface of the tibial plateau tray 2 is provided with a porous structural layer 4, wherein the porous structural layer 4 may include a plurality of filament diameters and a plurality of pores formed by the plurality of filament diameters being connected to each other in an alternating manner, the pores may be connected to each other, wherein the diameter of each pore may preferably range from 10 μm to 800 μm, and the porosity of the porous structural layer 4 may preferably range from 30% to 80%. Through this setting, in this application, through communicating each other by each hole that the mutual staggered connection of silk footpath formed, and construct the diameter size inconsistent with each hole, and carry out specific setting to the diameter in porous structure layer 4's hole and the scope of porosity, make porous structure layer 4's structure and human bone trabecula structure more be close, the induced bone that porous structure layer 4 that has higher porosity and connectivity can be fine grows into, human sclerotin can grow into in porous structure layer 4's hole fast nature like this, thereby improved osteoblast's adhesion, appreciation, the ability of differentiation, the growth of iliac sclerotin has been promoted effectively and has been crawled, and then be favorable to biological type knee joint prosthesis 100 to fuse and fix with the sclerotin speed of human knee joint at the postoperative, consequently, the recovery effect of patient's postoperative has been improved effectively.

In a second aspect of the present application, the outer surface 12 is provided with a friction reducing layer 5, preferably the friction reducing layer 5 may be configured as an amorphous carbon thin film layer. Through this setting, the surface of thighbone condyle prosthesis 1 in this application can have higher wearability and corrosivity through setting up amorphous carbon film layer, and the coefficient of friction that reduces simultaneously can also reduce because of long-time use and the wearing and tearing that cause pad 3 to can improve the whole life of biotype knee joint prosthesis 100 in the postoperative effectively.

It should be noted that the cross section of each pore formed by the wire diameter is not a regular circle, but the cross sectional shape thereof may be various shapes, and in view of this, reference herein to the "diameter" of each pore should be understood to mean the diameter of a circle when the cross section of each pore is equivalent to a circle. Since the diameter of the cross section equivalent to a circle is calculated from the actual area of the cross section, the value of the diameter obtained is an accurate value. Preferably, the porous structure layer 4 may be formed by 3D printing using metal powder, which may be titanium alloy, pure titanium, tantalum metal, or the like. Preferably, the porous structure layer 4 is made of a titanium alloy material, preferably Ti6Al 4V. Through the arrangement, the strength and the elastic modulus of the porous titanium/titanium alloy can be adjusted by changing the porosity, and the mechanical property matched with the repaired bone tissue is achieved, so that the stress shielding effect is reduced or eliminated, and the service life of the implant is prolonged.

In the preferred embodiment shown in FIG. 2, the interior surface 11 may include an anterior condyle connecting surface 111 and a posterior condyle connecting surface 112. Wherein the thickness of the porous structural layer 4 on the surfaces of the anterior condyle connecting surface 111 and the posterior condyle connecting surface 112 is greater than the thickness of the porous structural layer 4 on the other portions of the inner surface 11 in a range of 0.2mm to 0.5 mm. Preferably 0.3 mm. Through this setting, the thickness of porous structure layer 4 on the surface of anterior condyle connecting surface 111 and posterior condyle connecting surface 112 is thicker, can make anterior condyle connecting surface 111 and posterior condyle connecting surface 112 have better osteofusion's effect to can play with the better connection effect of thighbone, further improve the stability of being connected of thighbone condyle prosthesis 1 and human thighbone.

In a preferred embodiment shown in fig. 3 and 4, the tibial plateau tray 2 may include a platform portion 21 and a connecting portion 22, the platform portion 21 being for connection to the liner 3; the connecting part 22 is vertically connected with the platform part 21 and is used for being connected with the tibia, wherein the connecting part 22 comprises a connecting column 221, the connecting column 221 is used for being inserted into a bone cavity of the human tibia to be connected, and a porous structure layer 4 is arranged on the outer surface of the connecting column 221. Through the arrangement, the porous structural layer 4 can improve the fusion of the connecting column 221 and sclerotin, so that the connection stability of the connecting column 221 implanted into the tibia can be effectively improved.

Preferably, as shown in connection with fig. 3, the connection column 221 may be configured as a solid column of hexagonal cross-section. Through the arrangement, on one hand, the solid body can improve the structural strength of the connecting column 221; on the other hand, the hexagonal cross section can effectively slow down the problem that the tibial plateau support 2 rotates after being implanted after being connected with the tibia of a human body through the connecting column 221, and the stability of the tibial plateau support 2 after being connected is improved.

In a preferred embodiment, the diameter dimension of the circumscribed circle of the hexagonal cross-section may range from 5mm to 10 mm. Preferably 7 mm. Through this setting, can improve the bearing capacity of tibial plateau support 2.

In the preferred embodiment shown in fig. 3, the connecting portion 22 may further include two connecting wings 222 at both tables of the connecting column 221. Through this setting, two connection wings 222 can increase the bone tissue area of contact of tibial plateau support 2 with the shin bone, not only can slow down the not hard up of tibial plateau support 2 after the implantation like this, can also promote the bone to grow into for the stability after tibial plateau support 2 connects is better. In addition, the rotation of the tibial plateau tray 2 after implantation can be further slowed.

In a preferred embodiment, the material of the femoral condyle prosthesis 1, the tibial plateau support 2 and the porous structural layer 4 is titanium alloy, and the material of the liner 3 is ultra-high molecular weight polyethylene.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the utility model pertains.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the utility model not be limited to the particular embodiments disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.

Claims (8)

1. A biotype knee prosthesis, comprising:

the femoral condyle prosthesis is used for being connected with the femur of a human body;

the tibia platform support is used for being connected with the tibia of a human body; and

a liner located between the femoral condyle prosthesis and the tibial plateau tray;

the femoral condyle prosthesis comprises an inner surface used for being connected with a femur of a human body and an outer surface opposite to the inner surface, wherein the outer surface is used for being connected with the liner, the inner surface and/or the surface of the tibial plateau support are/is provided with a porous structural layer, the outer surface is provided with a friction reduction layer, and the friction reduction layer is configured to reduce the friction coefficient of the outer surface.

2. The biotype knee prosthesis of claim 1, wherein the friction reducing layer is configured as an amorphous carbon film layer.

3. The biologic knee prosthesis of claim 2 wherein said interior surface includes an anterior condyle connection surface and a posterior condyle connection surface, wherein a thickness of the porous structural layer on the surfaces of said anterior condyle connection surface and said posterior condyle connection surface is greater than a thickness of the porous structural layer of the remainder of said interior surface in a range of 0.2mm to 0.5 mm.

4. The biotype knee prosthesis of any one of claims 1-3, wherein the tibial plateau tray comprises a platform portion and a connecting portion, the platform portion being configured to connect to the pad; the connecting part with platform portion is connected perpendicularly for link to each other with the shin bone, wherein, connecting part include the spliced pole, the spliced pole is used for inserting to the bone intracavity of human shin bone in order to connect, be equipped with porous structure layer on the surface of spliced pole.

5. The biotype knee prosthesis of claim 4 wherein the attachment posts are configured as solid posts of hexagonal cross-section.

6. The biotype knee prosthesis of claim 5 wherein the diameter dimension of the circumscribed circle of the hexagonal cross-section ranges from 5mm to 10 mm.

7. The biotype knee prosthesis of claim 4 wherein the connection portion further comprises two connection wings on both surfaces of the connection column.

8. The biometric knee joint prosthesis of any one of claims 1-3, wherein the material of the femoral condyle prosthesis, the tibial plateau tray, and the porous structural layer is a titanium alloy, and the material of the liner is ultra-high molecular weight polyethylene.

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