intramedullary implant system

Abstract

The invention discloses an intramedullary implantation system, comprising a main nail, a lag screw, an anti-rotation nail and a pressure locking nail; the proximal end of the main nail is provided with a gourd-shaped anti-rotation hole; the lag screw is penetrated in the first through hole , the front end is connected to the femoral head, the rear end is threadedly connected to the pressure lock nail, and the side wall is provided with a notch extending axially and communicating with the inner cavity of the lag screw; Contact, the rear end is provided with a step that restricts the forward movement of the anti-rotation nail, and the contact surface is provided with a boss. Continued rotation of the Compression Nail under the confinement of the boss forces the Lag Screw back and puts pressure on the fracture line. The intramedullary implant system provided by the invention can stably resist torsional stress and axial load, effectively prevent the rotation of the femoral head, pressurize the fracture site, and dynamically promote the healing of hip fractures.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to an intramedullary implantation system. Background technique [0002] The hip (groin area) is the part where the torso and the legs connect, allowing the body and legs to move forward, backward, and sideways voluntarily. Because the hip is the center of a range of body movements, it is prone to potential strain and fractures. Intramedullary nails are orthopaedic internal fixation devices in medical devices. Intramedullary nails are the preferred internal fixation devices for hip fractures (such as femoral head and neck fractures), which can control the axial line of force at the fracture site. Fracture rotation deformity, thereby reducing the risk of implant fracture, and because the intramedullary nail uses a closed and minimally invasive technique, it can reduce the infection rate of the operation. However, in the vast majority of the existing intramedullary nails, due...

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

Images