Distributed acetabular prosthesis

Abstract

The invention relates to the field of biomedical engineering, in particular to a distributed acetabular prosthesis. The distributed acetabular prosthesis comprises a backing, a connecting body and ceramic wafers, wherein the backing is a spherical cap-shaped metal; first micropores are evenly distributed in the outer surface of the backing; second micropores are evenly distributed in the inner surface of the backing; the side surface of each ceramic wafer is a columnar body with a taper, or a step or a groove; and both the big end face and the side surface of the ceramic wafer are connected to the backing in an adhering manner through the connecting body; the connecting body is a high polymer, and is squeezed into the second micropores in the inner surface of the backing in an injection molding manner; and the big end face and the small end face of the ceramic wafer are processed to be spherical cap-shaped. The distributed acetabular prosthesis provided by the invention can reduce integral wall thickness of an artificial acetabulum, and enlarges the diameter of a ceramic sphere in an artificial hip joint system, so that the movement range of an artificial hip joint is increased; the problem of fragmentation caused by that the backing is an integral ceramic is solved; the mass of the hip joint is lightened, so that the movement of a patient can be more light and handy; and the distributed acetabular prosthesis has effects of impact resistance and noise reduction to some degree, and is suitable for a ceramic-to-ceramic artificial hip joint system.

Description

technical field [0001] The invention relates to an orthopedic implant prosthesis in the field of biomedical engineering, in particular to a distributed acetabular prosthesis. Background technique [0002] Artificial hip replacement is an effective clinical treatment for hip injuries caused by trauma or disease. The artificial hip joint system consists of an acetabulum, a joint handle, and a ball head. The common acetabulum consists of a metal backing and an inner lining. The backing material is metal, the inner lining material is metal, ceramics and polymer materials, and the ball head material is metal and ceramics. The contact between the ball head and the lining constitutes a pair of friction pairs. At present, there are several types of artificial hip joints clinically used: 1. Metal ball head and metal lining pair, the friction pair formed by this pair will have toxic metal ion precipitation during the long-term friction and wear process. Accumulation to a certain co...

AI Technical Summary

Problems solved by technology

This is a pure metal acetabular cup with a relatively thin wall, which can effectively increase the range of motion of the artificial hip joint, but there is metal ion precipitation, which causes local tissue lesions, and wear debris induces osteolysis around the prosthesis Defects

Publication number: CN102488573A, name: "A Discrete Ceramic Cylinder Artificial Acetabular" discloses an artificial acetabular, including a porous metal outer shell, a metal mesh inner shell and a ceramic cylinder, the ceramic cylinder and the metal outer shell and the inner shell The connection method is mechanical connection. This structure makes the acetabular wall relatively thin, which can effectively increase the range of motion of the artificial hip joint. However, the discrete circular holes in the inner shell are sparsely distributed, resulting in the total contact between the ceramic column and the ball head. The smaller the area, the greater the contact stress of each ceramic column, which is prone to cracking

At the same time, the mating surface of the ceramic column, the metal shell and the inner lining requires high machining accuracy and surface roughness, which is difficult to manufacture and high in cost.

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