Non-metal ball hip joint prosthesis

Abstract

The invention relates to the field of medical apparatus and instruments, in particular to a non-metal ball hip joint prosthesis.The non-metal ball hip joint prosthesis comprises an acetabulum cup prosthesis body, a non-metal femoral head prosthesis body and a femoral stem prosthesis body.According to the non-metal ball hip joint prosthesis, an original acetabulum cup and liner are changed into a metal cup, and meanwhile a traditional metal or ceramic ball is changed into a high-crosslinking polyethylene ball with a metal core.On the premise that compatibility of the original metal-polyethylene joint surface is maintained, the thickness of the acetabulum cup is greatly decreased, and the large-diameter ball can be used when the small-diameter joint cup is available.Connection among components is reduced, meanwhile, the wear probabilit is greatly lowered, and the defects that a traditional complete hip joint prosthesis is small in movement angle, prone to dislocation and high in acetabulum side bone removal amount are overcome.

Description

Technical field [0001] The present invention relates to the field of medical equipment, in particular to a non-metallic ball-head hip joint prosthesis. Background technique [0002] Such as figure 1 As shown, the structure of the traditional global total hip joint prosthesis consists of a metal acetabular cup, a polyethylene liner, a femoral head and a femoral stem. The metal acetabular cup 1 and the liner 2 are fixed as a whole, and the inner surface of the liner 2 It is an inner spherical surface, and the outer surface of the femoral head 3 is an outer spherical surface that matches the inner spherical surface of the inner lining 2. In this way, the hip joint prosthesis can have a certain degree of mobility through the rotation of the femoral head 3 in the inner lining 2 , And because in order to prevent the displacement of the femoral head, the inner liner is set to protrude from the metal acetabular cup on one side. Due to the strength and wear of the inner lining, the thick...

AI Technical Summary

Problems solved by technology

While reducing the contact area and increasing wear, the small-diameter ball head may be prone to dislocation, and at the same time, it will affect the range of motion of the joint prosthesis, so that the range of motion of the joint prosthesis is not greater than 90°, such as figure 2 and image 3 , which are schematic diagrams of the two limit states of the traditional global total hip prosthesis, but the range of motion of the human physiological hip joint is greater than 120°, which is far from meeting the needs of the human body

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