Hip joint prosthesis

Abstract

The invention discloses a hip joint prosthesis. The hip joint prosthesis comprises an acetabular outer cup, an acetabular lining and a ball head, wherein a thickening sleeve is arranged on the outer side of the acetabular outer cup; the acetabular lining is located in the acetabular outer cup; the ball head is located in the acetabular lining; a plurality of hemispherical grooves are formed in thelower end, in contact with the acetabular lining, of the ball head; balls are arranged in the hemispherical grooves; the balls are in contact with the inner wall of the acetabular lining; a pluralityof petal bulges are arranged on the periphery of the upper end of the outer wall of the acetabular lining; strip-shaped bulges are arranged at the lower ends of the petal bulges; special-shaped square holes are formed in the positions, corresponding to the strip-shaped bulges, of the side wall of the acetabular outer cup; square holes are formed in the positions, corresponding to the special-shaped square holes, of the side wall of the thickening sleeve; and special-shaped movable blocks are arranged in the special-shaped square holes and the square holes. According to the hip joint prosthesis, friction between the acetabular lining and the ball head is reduced, the acetabular outer cup can be pre-fixed when the acetabular outer cup is installed, and the risk of an installation failure isreduced.

Description

technical field [0001] The invention relates to the field of hip joint replacement, in particular to a hip joint prosthesis. Background technique [0002] The human hip joint is composed of the femoral head and the acetabular socket. It is a typical acetabular joint and is located at the root of the human thigh. Walking, can only rest in bed, at this time you need to do hip replacement surgery, that is, use hip prosthesis to replace the human hip joint, instead of hip joint movement, the existing hip joint replacement surgery has been developed for more than 100 years. Quite mature, benefiting many patients with femoral head necrosis. However, there are also some defects in the existing hip replacement surgery. First, one of the most concerned issues in the industry is the problem of particles produced by the wear of the acetabular lining. Most of the existing acetabular linings are made of ultra-high molecular weight polyethylene materials. Manufacture, after installing t...

AI Technical Summary

Problems solved by technology

However, there are also some defects in the existing hip replacement surgery. First, one of the most concerned issues in the industry is the problem of particles produced by the wear of the acetabular lining. Most of the existing acetabular linings are made of ultra-high molecular weight polyethylene materials. Manufacture, after installing the prosthesis, most of the movement friction occurs between the ball head and the acetabular lining. The wear rate of the metal ball head is extremely low, about 0.00400 / year, while the wear rate of polyethylene is 0.1mm / year , the particles produced by polyethylene wear can lead to a series of case reactions such as synovitis, joint instability, osteolysis and prosthesis loosening; In the human acetabular fossa, the acetabular outer cup is fixed on the human acetabular fossa with screws. During this process, the acetabular outer cup is prone to deflection, causing the acetabular outer cup to not be accurately installed. If the installation is misplaced, it needs to be re-drilled. Hole installation will increase the risk of surgery and increase the pain of the patient; 3. During the operation, in order to match the acetabular socket and the acetabular cup, it is necessary to use a file to grind the acetabular socket to fit the acetabular cup However, the natural shape of the human acetabular fossa is that the side wall is thicker and the bottom is thinner. The force of press-fitting between the acetabular fossa and the acetabular outer cup should gradually decrease from the side wall to the bottom. In the prior art The press-fitting force of the acetabular fossa and the acetabular cup will lead to excessive bone compression at the bottom of the acetabular fossa and too little compression of the side wall

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