Composite bulb artificial hip joint

Abstract

The invention provides a composite bulb artificial hip joint, and the artificial hip joint is formed by the combination of an artificial acetabulum and a composite bulb. The internal surface of the artificial acetabulum cooperates with the external surface of the composite bulb, and the composite bulb can rotate in the artificial acetabulum. The interior of the artificial acetabulum is not provided with a liner, and the internal surface of the artificial acetabulum makes direct contact with the composite bulb. The composite bulb comprises a metal bulb made of a metal material, and a nonmetal housing wrapping the external surface of the metal bulb. The artificial hip joint employs the composite bulb, and the wear-resistant nonmetal housing wraps the metal bulb. The artificial hip joint is large in supporting strength, is high in bearing force, effectively reduces the maximum contact stress of the nonmetal housing, is stable and reliable, and is not liable to be damaged. Because the interior of the artificial acetabulum is not provided with the liner, the size of the composite bulb can be increased, thereby improving the motion range of the joint, reducing the collision between a thigh stem trunk and the boundary of an acetabulum cup, reducing the dislocation risks of the acetabulum and the composite bulb, prolonging the service life of the artificial hip joint, and improving the use function of the artificial hip 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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