Internal fixation device for fracture around proximal femoral prosthesis

Abstract

The invention relates to an internal fixation device for fracture around a proximal femoral prosthesis, which belongs to the field of medical appliances and consists of a steel plate, an embracing fixator and the like. The internal fixation device is characterized in that the steel plate is provided with 1-2 common screw holes and 2-8 locking screw holes which are used for fixing a distal fracture end; the embracing fixator comprises a main body and 3-6 pairs of embracing ring arms, the diameters of the embracing ring arms match with the size of the circumference of a proximal femur section, the embracing fixator is used for fixing a fracture block of the proximal femur section, and saw-tooth-shaped objects are arranged on the embracing ring arms at the distal end and a proximal end, are protruded to a concave side and can reinforce fixation; and the steel plate is connected with the main body of the embracing fixator, the thicknesses of the steel plate and the embracing fixator are about 5mm, and the widths of the steel plate and the embracing fixator are about 2cm. The internal fixation device is made of titanium and nickel memory alloy with a temperature memory function, has good histocompatibility, and is applicable to a patient suffering from fracture around the proximal femoral prosthesis after total hip arthroplasty or artificial femoral head replacement.

Description

technical field [0001] The invention relates to a medical device, which is a fracture fixer around the prosthesis of the proximal femur. technical background [0002] After artificial total hip replacement or artificial femoral head replacement, periprosthetic femoral fractures occur again due to trauma, and because the femoral stem prosthesis occupies space in the femoral medullary cavity, intramedullary nailing cannot be performed. For fixation, the proximal femoral screw cannot reach the contralateral cortex, and only single cortex fixation can be performed, which is not firm. Patients after joint replacement often have osteoporosis, and if single cortex fixation is performed, the fixation is even less firm. In recent years, embracing devices have been selected to fix periprosthetic fractures of the proximal femur. The fixation is effective and it is a relatively good fixation method. However, the use of embracing devices requires extensive stripping of the muscles and pe...

AI Technical Summary

Problems solved by technology

[0002] After artificial total hip replacement or artificial femoral head replacement, periprosthetic femoral fracture occurs due to trauma, and because the femoral stem prosthesis occupies space in the femoral medullary cavity, intramedullary nailing cannot be performed. Fixation, the proximal femoral screw cannot reach the contralateral cortex, only single cortex fixation can be performed, and the fixation is not firm. Patients after joint replacement often have osteoporosis, and if single cortex fixation is performed, the fixation is even less firm

In recent years, embracing devices have been selected to fix periprosthetic fractures of the proximal femur. The fixation is effective and it is a relatively good fixation method. However, the use of embracing devices requires extensive stripping of the muscles and periosteum around the fracture fragments at both ends of the fracture. Due to the extensive stripping, the blood supply of the bone block is greatly damaged, which is not conducive to fracture healing

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