Double-lower-limb equal-length precise comparison device in hip replacement

Abstract

The invention discloses a double-lower-limb equal-length precise comparison device in hip replacement. The double-lower-limb equal-length precise comparison device comprises a prosthesis; the outer side face of the prosthesis is movably connected with a greater trochanter; the right side of the top of the prosthesis is fixedly connected with a femoral head located on the inner side of the greatertrochanter; the interior of the prosthesis is movably connected with a connecting rod; the top end of the connecting rod penetrates through the outer part of the prosthesis; a first graduated scale isarranged on the front surface of the connecting rod; a second graduated scale is arranged on the front surface of the first graduated scale; teeth are fixedly connected to the surfaces of the first graduated scale and the second graduated scale; and clamping holes are formed in the first graduated scale and the second graduated scale. By arranging the prosthesis, the connecting rod, the first graduated scale, the second graduated scale, the teeth, the clamping holes, a guide mechanism and a fixing mechanism, the longitudinal axis of a femoral medullary cavity can be drawn, and meanwhile, a vertical line of the longitudinal axis is made through the greater trochanter, and the vertical distance between the femoral head rotating center and the vertical line and the vertical distance betweenthe femoral head rotating center and the longitudinal axis are measured; and therefore, the measurement accuracy is improved, and the use of people is facilitated.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a precision comparison device for equal lengths of lower limbs in hip joint replacement. Background technique [0002] For femoral head necrosis, femoral neck fracture, hip osteoarthritis and other diseases, if conservative treatment fails, hip replacement is a good choice. After operation, patients can return to normal life quickly, so do hip replacement There are many reference indexes for hip arthroplasty, among which equal length of lower limbs and appropriate femoral eccentricity are crucial reference indexes for hip arthroplasty. If the length difference of lower limbs exceeds 5mm, the patient may feel discomfort; If the eccentricity of the femur is too small, it will cause muscle weakness when the hip joint moves; if the eccentricity is too large, the patient will have obvious tension in the hip, which will affect the hip joint. Range of motion. Therefore, in hip ...

AI Technical Summary

Problems solved by technology

[0002] For femoral head necrosis, femoral neck fracture, hip osteoarthritis and other diseases, if conservative treatment fails, hip replacement is a good choice. After operation, patients can return to normal life quickly, so do hip replacement There are many reference indexes for hip arthroplasty, among which equal length of lower limbs and appropriate femoral eccentricity are crucial reference indexes for hip arthroplasty. If the length difference of lower limbs exceeds 5mm, the patient may feel discomfort; If the eccentricity of the femur is too small, it will cause muscle weakness when the hip joint moves; if the eccentricity is too large, the patient will have obvious tension in the hip, which will affect the hip joint. Range of motion. Therefore, in hip replacement surgery, it is important to achieve the same length of both lower limbs and appropriate femoral eccentricity.

[0003] Usually we refer to the normal side hip joint as a reference, draw the longitudinal axis of the femoral medullary cavity, and at the same time draw the vertical line of the longitudinal axis at the apex of the greater trochanter, draw the center of rotation of the femoral head, measure the vertical distance between the center of rotation of the femoral head and the vertical line, and measure at the same time The vertical distance from the center of the femoral head to the longitudinal axis. In hip replacement surgery, after the prosthesis is implanted, the doctor will use a ruler to compare it with the preoperative measurement data on the normal side, and draw the femoral medullary cavity The longitudinal axis, the oversized trochanter is used as the vertical line of the longitudinal axis, and the vertical distance between the center of rotation of the femoral head and the vertical line, and the vertical distance between the center of the femoral head and the longitudinal axis are measured, usually based on the experience of the surgeon and compared with the naked eye, and there are individual differences Therefore, those skilled in the art provide a device for the isometric precision comparison of double lower limbs in hip arthroplasty to solve the problems raised in the above-mentioned background technology

Images