A kind of intramedullary nail for tumor type knee joint prosthesis

Abstract

The invention discloses a tumor type knee joint prosthesis intramedullary needle which comprises a thighbone intramedullary pin lower segment, a thighbone intramedullary pin upper segment and a self-adaptive part. The thighbone intramedullary pin lower segment and the thighbone intramedullary pin upper segment are inserted into the thighbone marrow cavity during an operation. The self-adaptive part enables the thighbone intramedullary pin lower segment and the thighbone intramedullary pin upper segment to be connected and enables the intramedullary needle to have a certain rotating freedom degree. The self-adaptive part comprises a self-adaptive bearing column at the end of the thighbone intramedullary pin upper segment, an inner pin hole in the self-adaptive bearing column, an outer pin hole in the side wall of the end of the thighbone intramedullary pin lower segment and a self-adaptive bearing cone hole in the end of the thighbone intramedullary pin lower segment, and the self-adaptive bearing column can be inserted into the self-adaptive bearing cone hole. A pin capable of being inserted into the outer pin hole and the inner pin hole is further included. The intramedullary needle can adapt to the physiological curvature that the thighbone is upward outside, inclined and downward inside, and the technical problem that the thighbone and the prosthesis lateral force line are not matched due to the fact that an existing artificial knee joint prosthesis intramedullary needle is inconsistent with the thighbone anatomic form can be solved better.

Description

technical field [0001] The invention belongs to the field of biomechanics, and in particular relates to an intramedullary needle for a tumor type knee joint prosthesis. Background technique [0002] With the significant increase in the survival rate of malignant bone tumors and the success rate of limb salvage, patients have higher requirements for the function and long-term stability of long-segment prosthesis replacement. Tumor-type knee prosthesis replacement can complete functional reconstruction in a short period of time, but previous clinical studies have shown that the survival time of prostheses varies greatly. Although tumor-type knee prosthesis replacement can achieve functional reconstruction, anatomical reconstruction is difficult. Due to the large volume and long line of force of the tumor-type artificial knee prosthesis, theoretically the matching of the bone and the line of force of the prosthesis will affect its survival time. At the anatomical level, it is...

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Problems solved by technology

[0003] In order to overcome the problems existing in the above-mentioned prior art, the object of the present invention is to provide an intramedullary needle for tumor-type knee joint prosthesis, which can be applied to reconstruction of residual limb function in tumor-type knee joint prosthesis replacement, and can better solve the problem of The problem of the mismatch between the physiological curvature of the lateral femur and the force line of the prosthesis, the intramedullary nail of the tumor-type prosthesis can better solve the problem of loosening and sinking of the prosthesis caused by the poor alignment of the prosthesis and the lateral force line of the femur. The problem of poor alignment of the lateral force line of the femur and the inconformity with the physiological curvature of the lateral femur is better resolved

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