A biomimetic surface hip prosthesis for easy replacement

Abstract

The invention relates to the technical field of medical device design, in particular to a bionic surface hip joint prosthesis that is convenient for replacement, which comprises an acetabular cup prosthesis, a femoral head prosthesis, a pressure main nail and a tension auxiliary nail, and an acetabular cup prosthesis. The inner surface of the femoral head prosthesis is a hemispherical sliding friction fit with the outer surface of the femoral head prosthesis. The contact surface between the acetabular cup prosthesis and the femoral head prosthesis and the bone is a 3D printed bone trabecular structure. A head groove and a tail groove are formed in the femoral head prosthesis, and a spherical cover is installed at the head groove. The rear ends of the pressure main nail and the tension auxiliary nail are respectively provided with external threads, and the front ends of the pressure main nail and the tension auxiliary nail are respectively connected to the partitions respectively. The device provided by the invention has simple structure, convenient replacement, low cost, low friction coefficient and metal ion precipitation, good long-term bone ingrowth performance and can reconstruct the physiological fulcrum of the hip joint.

Description

technical field [0001] The invention relates to the technical field of medical device design, in particular to a bionic surface hip joint prosthesis that is convenient for replacement. Background technique [0002] Surface hip prostheses are orthopaedic implants used to replace part of the human hip joint. For superficial hip replacement surgery. The surface hip joint prosthesis mainly includes an acetabular outer cup prosthesis and a femoral head prosthesis which is sheathed in the acetabular outer cup prosthesis and inserted into the human femoral head. The superficial hip can theoretically preserve femoral bone, slow disease progression, and improve the patient's hip function in relation to future revision surgery. [0003] However, with the widespread development of superficial hip arthroplasty, the procedure also has some drawbacks. The main causes of prosthesis failure include: femoral neck fracture, femoral head collapse and prosthesis loosening. The friction inte...

AI Technical Summary

Problems solved by technology

The friction interface between the acetabular cup and the femoral head prosthesis of the existing surface hip joint prosthesis is the "gold-to-gold" interface of cobalt-chromium-molybdenum metal, although the friction coefficient of the "gold-to-gold" interface is relatively lower than other friction interfaces. Low, but the "gold-to-gold" interface will lead to the precipitation of cobalt and chromium metal ions, which will produce adverse biological reactions, including toxic effects on soft tissues near joints, delayed hypersensitivity reactions, osteolysis, and certain carcinogenicity , eventually leading to prosthetic loosening and failure

The osseointegration interface of the acetabular cup of the existing surface hip prosthesis is sprayed with hydroxyapatite coating, which may cause the risk of coating falling off or being absorbed within a certain period of time, resulting in loss of corresponding osseointegration effect

The existing superficial hip joint prosthesis is prone to femoral neck fracture and femoral head collapse. The main reason is that the design of the fixed shaft of the femoral head prosthesis cannot reconstruct the physiological fulcrum and cannot restore the normal human hip joint force form, resulting in fixation. failure and complications

Moreover, the existing femoral head replacement prosthesis has an integrated structure. After the top of the spherical surface is worn out, the femoral head prosthesis needs to be replaced as a whole. The cost is relatively high, and the operation is more troublesome. replacement

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