Full acetabulum prosthesis

Abstract

The invention discloses a full acetabulum prosthesis, comprising a metal outer cup (1), a ceramic liner (2) and a ceramic ball head (3), wherein the metal outer cup (1) is arranged outside the ceramic liner (2) in a sleeving manner; the ceramic liner (2) is arranged outside the ceramic ball head (3) in a sleeving manner; the outside surface of the ceramic liner (2) is formed by the connection of multiple planes; an angle is formed between adjacent planes; the inner surface of the metal outer cup (1) is matched with the outer surface of the ceramic liner (2); the metal outer cup (1) can be connected with the ceramic liner (2); the inner surface of the ceramic liner (2) is of a ball shape; the outer surface of the ceramic ball head (3) is matched with the ball shape of the inner surface of the ceramic liner (2); the ceramic ball head and the ceramic liner are enabled to mutually rotate through a ceramic articular surface formed by the outer surface of the ceramic ball head and the inner surface of the ceramic liner. The full acetabulum prosthesis disclosed by the invention overcomes the existing defect of abrasion between an ultra high molecular weight polyethylene liner and the ball head, dislocation is not easy to occur, and prosthesis implantation is stable.

Description

technical field [0001] The invention relates to a medical prosthesis, in particular to a total acetabular prosthesis replacing a patient's hip joint. Background technique [0002] The total hip joint prosthesis is a surgical implant used to replace the hip joint. It consists of a full acetabulum, a ball head, and a femoral stem. The inner lining of the acetabulum is in contact with the ball head to form various forms of articular surfaces. At present, the articular surface forms on the market include the combination of ultra-high molecular weight polyethylene lining and CoCrMo metal ball head, and the combination of ultra-high molecular weight polyethylene lining and ceramic ball head can form the above two articular surfaces. [0003] Although the above-mentioned various articular surface prosthesis can replace part of the articular surface of the hip joint and femur, it is indeed progressive, but in actual use, it is found that there are still some shortcomings in its stru...

AI Technical Summary

Problems solved by technology

[0003] Although the above-mentioned various articular surface prosthesis can replace part of the articular surface of the hip joint and femur, it is indeed progressive, but in actual use, it is found that there are still some shortcomings in its structure, resulting in the prosthesis in practical application. The best use effect has not been achieved, and its shortcomings can be summarized as follows:

[0004] The combination of ultra-high molecular weight polyethylene liner and CoCrMo metal ball head and the combination of ultra-high molecular weight polyethylene liner and ceramic ball head are a combination of soft and hard articular surfaces. The above two articular surfaces have unsolvable problems. Severe wear problem, due to the processing characteristics of polyethylene, the roundness of the joint surface of the i...

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