Surface hip endoprosthesis

Abstract

The invention relates to the field of medical apparatuses, and discloses a surface hip endoprosthesis. The surface hip endoprosthesis comprises a caput femoris prosthesis, wherein the caput femoris prosthesis comprises a caput femoris part sleeving the external surface of the caput femoris of a human body and a fixing part connected with the caput femoris part and transplanted into the caput femoris of the human body; a first rotating preventing groove is formed in an inner surface in cooperating with the outer surface of the caput femoris of the human body, of the caput femoris part, and / or asecond rotating preventing groove is formed in the outer surface of the fixing part. The surface hip endoprosthesis can guarantee the self joint function and stability under the condition of long-term use.

Description

technical field [0001] The invention relates to the field of medical instruments, in particular to a surface hip joint prosthesis. Background technique [0002] A surface hip prosthesis is a surgical implant used to replace part of the human hip joint. For hip resurfacing surgery. The surface hip joint prosthesis mainly includes an acetabular outer cup prosthesis and a femoral head prosthesis that is sheathed in the acetabular outer cup prosthesis and is used to connect with the femoral head of a human body. Superficial hip replacement can effectively reduce the repair rate and failure rate after hip replacement, and prolong the service life of the prosthesis. [0003] There are still many disadvantages in the existing surface hip prosthesis. For example, the contact surfaces of the acetabular cup prosthesis and the femoral head prosthesis of the existing surface hip joint prosthesis are all metal surfaces, and the friction force of the two metal surfaces is much greater ...

AI Technical Summary

Problems solved by technology

For example, the contact surfaces of the acetabular cup prosthesis and the femoral head prosthesis of the existing surface hip joint prosthesis are all metal surfaces, and the friction force of the two metal surfaces is much greater than that of the normal articular surface of the human body, and the two metal surfaces Friction will produce fine metal particles, which will exist between the two metal surfaces, affect the relative movement of the acetabular cup prosthesis and the femoral head prosthesis, and cause the articular surface of the prosthesis to lock, thus making the acetabular cup The movement failure of the prosthesis due to the loss of rotation function between the prosthesis and the femoral head prosthesis

In addition, the spherical inner surface of the existing femoral head prosthesis (for socketing the outer surface of the femoral head of the human body) and the outer surface of the fixed shaft (for fixing the femoral head of the human body) are both smooth surfaces. After the bone prosthesis is implanted, relative rotation may occur between the spherical inner surface of the femoral head prosthesis and the human femur, and between the outer surface of the fixed shaft and the interior of the femoral head of the human body, resulting in loosening of the femoral head prosthesis or dislocation

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