A kind of composite spherical head artificial hip joint

Abstract

The invention provides an artificial hip joint with a composite ball head, which is composed of an artificial acetabulum and a composite ball head; the inner surface of the artificial acetabulum matches the outer surface of the composite ball head, and the composite ball head can Internal rotation; there is no liner in the artificial acetabulum, and the inner surface of the artificial acetabulum is in direct contact with the composite ball head. The composite ball head includes a metal ball head made of metal material and a metal ball head wrapped on the outer surface Non-metallic casing. The invention adopts a composite ball head and wraps the metal ball head with a wear-resistant non-metal shell, which has a large supporting force and a strong bearing capacity, effectively reduces the maximum contact stress of the non-metal shell, is stable, reliable, and not easily damaged. The present invention does not use a liner in the acetabulum, so that the size of the composite ball head can be increased, thereby increasing the range of motion of the joint, reducing the collision between the femoral stem neck and the boundary of the acetabular cup, and reducing the risk of dislocation between the acetabulum and the composite ball head , so as to effectively prolong the service life of the artificial joint and enhance the use function of the artificial joint.

Description

technical field [0001] The invention relates to the field of medical equipment, in particular to a composite ball head artificial hip joint. Background technique [0002] The human hip joint is composed of the acetabulum and the ball head of the femur. The ball head rotates in the acetabulum to realize the normal movement of the human hip joint. The diameter of the human femoral ball is approximately 40 to 45 mm. When hip joint disease occurs, such as cartilage disease or femoral neck fracture, resulting in hip joint failure to function normally, hip replacement is required, that is, an artificial hip joint is placed through orthopedic surgery ( figure 1 ), which is currently the most commonly used surgical treatment. [0003] The existing artificial hip joint usually consists of a metal ball head and a metal artificial acetabular plus a non-metallic (usually high molecular polyethylene material) acetabular cup liner ( figure 2 ). Due to the limited strength of polyethy...

AI Technical Summary

Problems solved by technology

But the non-metallic femoral head prosthesis of this patent document is difficult to realize in practice, because the intensity of such non-metallic femoral head prosthesis is not enough, easily produces stress concentration at the place that connects with femoral stem, is difficult to bear the weight of human body mechanically, once in Used in artificial hip joints, easily damaged

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