Hip joint bipolar head

Abstract

The invention discloses a hip joint bipolar head. The hip joint bipolar head comprises a bipolar head cup, a lining and a pressing ring, wherein an accommodating cavity for accommodating a ball head is formed in the lining; the ball head is arranged in the accommodating cavity by using the pressing ring, so that the ball head is not separated from the lining; the bipolar head cup is fixedly arranged on the outer spherical surface of the lining; and the outer spherical surface of the bipolar head cup is arranged in an acetabulum. The bipolar head is formed by the bipolar head cup, the lining and the pressing ring, the bipolar head cup and the lining are fixedly mounted through a buckle structure in cooperation with an inner concave lug groove and a convex lug, and the hip joint bipolar headis convenient to assemble and high in reliability. The bipolar head cup is made of a PEEK material, is low in elastic modulus and is matched with a natural bone, so that the problem of stress shielding is solved, bone absorption is avoided, and a long-term good thigh retention effect is achieved; and meanwhile, surface contact pressure is reduced, so that abrasion to articular cartilage is reduced.

Description

technical field [0001] The invention relates to a hip joint bipolar head. Background technique [0002] A bipolar prosthesis is a surgical implant used to replace the femoral head of the hip. It is used in combination with a femoral stem for hip hemiarthroplasty. The service life of the bipolar head is generally 3-10 years, and the operation needs to be re-operated after the service life is over. The service life of the bipolar head is mainly affected by the convergent wear of the spherical surface of the artificial joint during activities, which will cause the spherical surface to deform and lose its function; secondly, the wear of the spherical surface of the artificial joint will lead to osteolysis, which will induce artificial hip joints The prosthesis loosens and dislocates after being implanted in the human bone. Contents of the invention [0003] Aiming at the defects of the above prior art, the main purpose of the present invention is to overcome the deficiencie...

AI Technical Summary

Problems solved by technology

The service life of the bipolar head is mainly affected by the convergent wear of the spherical surface of the artificial joint during activities, which will cause the spherical surface to deform and lose its function; secondly, the wear of the spherical surface of the artificial joint will lead to osteolysis, which will induce artificial hip joints Prosthesis loosens and dislocates after being implanted in human bone

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