Intramedullary implantation system

Abstract

The invention discloses an intramedullary implantation system, which comprises a main nail, a lag screw, an anti-rotation nail and a pressurizing lock nail, wherein a calabash-shaped anti-rotation hole is formed in the near end of the main nail, the lag screw penetrates through a first through hole, the front end is connected with femoral head, the rear end is in threaded connection with the pressurizing lock nail, the side wall is provided with a notch which extends axially and is communicated with the inner cavity of the lag screw, the anti-rotation nail penetrates through a second through hole and makes contact with the notch face, the rear end of the anti-rotation nail is provided with a step for limiting the forward movement freedom degree of the anti-rotation nail, the contact face is provided with a boss, when the step makes contact with the side wall of the main nail, the boss limits the forward movement freedom degree of the pressurizing lock nail, and the pressurizing lock nail continues to rotate under the limitation of the boss, forces the lag screw to move backwards. and applies pressure to the fracture line. The intramedullary implantation system provided by the invention can stably resist torsional stress and axial load, effectively prevent femoral head rotation, and pressurize and power a fracture part to promote hip fracture healing.

Description

technical field [0001] The invention relates to the technical field of medical instruments, in particular to an intramedullary implantation system. Background technique [0002] The hip (groin area) is the part where the torso and legs are connected, allowing the body's torso and legs to move forward, backward and sideways autonomously. Because the hip is the center of a series of body movements, it is prone to potential strain and fracture. Intramedullary nail is an orthopedic internal fixation device in medical devices. Intramedullary nail is the preferred internal fixation device for hip fractures (such as femoral head and neck fractures). It can control the axial force line of the fracture site. Locking intramedullary nails can also prevent Fracture rotation deformity, thereby reducing the risk of implant fracture, because the intramedullary nail adopts closed and minimally invasive techniques, it can reduce the infection rate of surgery. However, most of the currently...

AI Technical Summary

Problems solved by technology

However, most of the currently existing intramedullary nails, due to design defects, often lead to rotation, separation and displacement of the fracture end during and after the operation, unstable broken ends, and lag screws cut out of the femoral head. Reoperation is often required to solve the above problems, which increases the suffering of patients and wastes medical resources

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