Combined type femoral stem

Abstract

The invention discloses a combined type femoral stem. The combined type femoral stem is used for fixing hip joint prostheses and comprises proximal femurs (1) and distal femurs (2). The bottom surfaces of the proximal femurs (1) are sunken to form limiting holes (11) in the shapes of inverted cones, the tops of the distal femurs (2) upwardly extend to form conical limiting columns (21), the conical limiting columns (21) are inserted into the limiting holes (11) in the shapes of the inverted cones, and the proximal femurs (1) with different specifications are connected with the distal femurs (2) with different specifications, so that the combined type femoral stem is adaptive to patients with different anatomic morphologies of pulp chambers. The combined type femoral stem has the advantages that the proximal femurs and the distal femurs are of adjustable structures, and accordingly the combined type femoral stem is wide in applicable patient range and is practical; the prostheses can be stably implanted into the patients, and surgery can be facilitated; stem-shaped structures are favorable for blood supply for the femoral hip chambers of the patients; the combined type femoral stem is excellent in rotation resistance and bone ingrowth, and accordingly the service lives of the prostheses can be prolonged.

Description

technical field [0001] The invention relates to an artificial joint prosthesis, in particular to a combined femoral handle for hip joints. Background technique [0002] The femoral stem prosthesis is a surgical implant used to replace the femoral part of the human hip joint. It is used in combination with the ball head and the full acetabulum for hip replacement surgery. [0003] The existing femoral stem prosthesis is usually a one-piece structure, which has the following disadvantages: [0004] 1) The population covered by patients is small. With the existing one-piece structure and serialized hip joint prosthesis, the shape ratio of the proximal end of the femur to the distal end is a fixed value and cannot be adjusted. However, in fact, the shape of the femoral canal of the patient With the characteristics of diversity, a single hip joint prosthesis can only meet the needs of patients with one type of femoral canal shape, and its application range is very limited; [0...

AI Technical Summary

Problems solved by technology

[0004] 1) The population covered by patients is small. With the existing one-piece structure and serialized hip joint prosthesis, the shape ratio of the proximal end of the femur to the distal end is a fixed value and cannot be adjusted. However, in fact, the shape of the femoral canal of the patient With the characteristics of diversity, a single hip joint prosthesis can only meet the needs of patients with one type of femoral canal shape, and its application range is very limited;

[0005] 2) The fixation effect is not good. Because the distal femur is cylindrical and the surface is polished, the anti-rotation ability of the prosthesis is weak. The surface of the proximal femur is sandblasted, and the surface is not rough enough, which is not conducive to bone ingrowth. The long-term loosening rate of the prosthesis will increase

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