Near-end side-by-side dual-screw type proximal femoral nail

Abstract

The invention relates to a near-end side-by-side dual-screw type proximal femoral nail. The near-end side-by-side dual-screw type proximal femoral nail comprises a femoral nail main nail, two near-endhead and neck screws and a far-end lock nail, wherein the femoral nail main nail comprises a near-end part, a transition part and a far-end part; a near-end screw passage allowing the two near-end head and neck screws to be mounted side by side is formed on the near-end part, and a far-end screw passage cooperating with the far-end lock nail is arranged on the far-end part; an inner lock nail forfixing the near-end head and neck screws is also in screw connection to the end of the near-end part; and an internal thread hole cooperating with the inner lock nail is formed in the near-end part and is sealed through a tail cap. Through the two near-end head and neck screws arranged side by side on the near-end part, the femoral nail has good screwing resistance, can effectively antagonize inversion trend of femoral head and neck fracture fragments, and can reduce stress of the head and neck screws.

Description

technical field [0001] The invention relates to articles for human life, in particular to a medical device, in particular to a proximal femoral intramedullary nail with double-screws arranged side by side. Background technique [0002] With the gradual aging of my country's population and the improvement of life expectancy, the annual incidence of intertrochanteric fractures in the elderly is increasing rapidly. At present, the treatment concept of intertrochanteric fractures is to advocate surgical treatment for patients who can tolerate surgery. Fixation instruments fix the fracture. The internal fixation devices for intertrochanteric fractures have undergone several decades of upgrading since their invention. The proximal femoral intramedullary nail has become the most commonly used internal fixation device for the treatment of intertrochanteric fractures due to its wide indications and definite fixation effect. Fixed equipment. [0003] The proximal femoral nail is an i...

AI Technical Summary

Problems solved by technology

[0004] Since intertrochanteric fractures mostly occur in the elderly, and most of the elderly have osteoporosis, these elderly patients with osteoporotic intertrochanteric fractures usually undergo clinical fixation with existing intramedullary nails. It is impossible to go to the ground early, because once the weight is put on the ground before the fracture heals, fracture displacement, proximal head and neck screw cut-out or penetration, and internal fixation breakage are prone to occur, which will eventually lead to internal fixation failure, which not only increases medical costs, but also seriously affects The patient's ground time and quality of life, increase the risk of complications related to long-term bed rest, and eventually lead to patient death

[0005] In the prior art, the head and neck screw of the proximal femoral intramedullary nail is mostly a single piece, which is weak against the rotation and varus of the femoral head and neck fracture fragment, and the single screw bears a large stress, which easily causes the patient to walk on the ground. , after applying force to the femoral head and neck fracture fragments, varus displacement, rotational displacement and head and neck screw fatigue of the head and neck fragments are prone to occur, which eventually lead to fracture displacement, internal fixation cut-out or penetration, and internal fixation fracture

In order to solve these problems, someone once designed a double-headed cervical screw-type intramedullary nail distributed longitudinally and parallelly at the proximal end. However, in clinical practice, a "Z" effect appeared, and the effect was not ideal, so it was gradually eliminated.

[0006] Although the currently clinically used head and neck screws are double proximal femoral intramedullary nails, the two head and neck screws are designed to be longitudinally distributed in parallel and the threads interlock to avoid the "Z" effect; however, this will The two head and neck screws are designed as proximal femoral intramedullary nails distributed longitudinally and parallelly. Although the anti-rotation ability is improved, the anti-inversion effect of the two screws is not significantly improved due to the longitudinal distribution of the two screws.

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