Acetabulum file concentricity maintaining device

Abstract

The invention relates to an acetabulum file concentricity maintaining device. The device comprises a fixed cylinder body, a nut disc matched with the fixed cylinder body, and a supporting sleeve coaxially fixed on the nut disc, wherein the fixed cylinder body is a thin-wall cylinder with openings at two ends, external threads are arranged on the outer circumferential surface of the upper end of the fixed cylinder body, four needle sleeves are arranged on the outer circumferential surface of the lower end of the fixed cylinder body, the four needle sleeves are uniformly distributed along the outer circumferential surface of the fixed cylinder body, the needle sleeves are thin-wall cylinder-shaped, and the axes of the needle sleeves are along a bus direction of the fixed cylinder body; wherein a screw cap disc is cylindrical; the lower end of the screw cap disc is open, internal threads starting from the lower end face are arranged on the inner circumferential face of the screw cap disc,the internal threads are matched with the external threads, the screw cap disc is coaxially screwed on the external threads at the upper end of the fixed cylinder body through the internal threads, and the lower end of the supporting sleeve is coaxially fixed to the upper end face of the screw cap disc. According to the invention, after a filing head is replaced, the filing head can perform filing again at a last filing position.

Description

technical field [0001] The invention relates to the technical field of medical instruments, in particular to an acetabular file concentricity maintaining device. Background technique [0002] Artificial total hip replacement is a prosthesis similar to human bone joints made of metal materials with good biocompatibility and mechanical properties. The joint prosthesis is implanted into the joint damaged by disease or injury by surgical methods. Its purpose is to relieve pain and restore joint activity and original function. Artificial hip replacement can enable patients to get off the ground and perform functional exercises early, and restore the normal physiological function of the hip joint. [0003] In total hip replacement surgery, the diseased femoral head is removed from the patient's body, and the corresponding joint prosthesis is installed. Among them, the acetabular fossa of the human body must be rasped to meet the external dimensions of the joint prosthesis. Usuall...

AI Technical Summary

Problems solved by technology

[0003] In total hip replacement surgery, the diseased femoral head is removed from the patient's body, and the corresponding joint prosthesis is installed. Among them, the acetabular fossa of the human body must be rasped to meet the external dimensions of the joint prosthesis. Usually, acetabular reamers are used to file the acetabular fossa to match the acetabular fossa with the joint prosthesis. It is difficult to accurately find the position of the previous file when the file is replaced with different sizes of files, and the file is re-filed after each replacement, which will cause the acetabular fossa to be filed into an ellipsoid, thus Lead to poor installation of joint prosthesis, increase the loosening rate and dislocation rate of joint prosthesis, lead to differences in limb length, prosthesis impact, interface wear, and even require revision surgery, reduce the service life of joint prosthesis, and increase the economic burden of patients. Therefore, There is an urgent need for a positioning device during the use of acetabular reamers

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