Metal 3D printing customized sleeve assembled femoral intramedullary needle prosthesis

Abstract

The invention relates to a metal 3D printing customized sleeve assembled femoral intramedullary needle prosthesis. The prosthesis comprises a sleeve and an intramedullary needle type femoral stem, wherein the sleeve is prepared from a metal material through 3D printing customization, the outer surface of the sleeve is of a microporous structure and is matched with the shape of a medullary cavity at the near end of a femur, a notch is formed in the sleeve, the inner surface of the sleeve has taper, and a locking screw hole used for being fixedly connected with other fixing devices is formed in the shoulder part of the sleeve; the intramedullary needle type femoral stem comprises a femoral connecting body, a neck body and a stem body which are connected in sequence, the outer surface of the neck body has taper matched with the sleeve, the stem body is provided with a front arch, and a locking screw hole used for being fixed to the far end of the femur is formed in the far end of the stem body; and the intramedullary needle type femoral stem is inserted into the sleeve, the femoral connecting body is matched with the notch in a nested mode, and the sleeve and the neck body are fixed in a taper press fit mode at the assembly fixing position. According to the prosthesis, near-end biological fixation can be realized, and the far end can prevent rotation and prevent early subsidence of the prosthesis through the locking screw hole and the screw of the stem body.

Description

technical field [0001] The invention relates to the technical field of artificial prosthesis, in particular to a metal 3D printed customized sleeve assembled femoral intramedullary needle prosthesis. Background technique [0002] For elderly patients with comminuted femoral intertrochanteric fractures and inclusive bone defects in the proximal femur after hip arthroplasty that require revision, the current treatment measures are mainly to use bio-type extended handles, which are tightly press-fitted and fixed through the isthmus of the distal femur. Such as figure 1 and figure 2 As shown; for patients with poor bone quality and bone mass, bone cement extension handles can also be used. However, through long-term follow-up, it was found that most of these distally fixed prostheses do not have an anatomical anterior arch design, which may easily cause the tip of the distal femoral prosthesis to protrude, and the anti-rotation effect is poor. The prosthesis sinks and fails,...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems existing in the artificial prosthesis used for the treatment of femoral intertrochanteric fractures and hip joint replacement in the prior art, the present invention provides a metal 3D printing customized sleeve assembled femoral intramedullary nail prosthesis

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