Internal-fixing hollow screw for intercondylar eminence and capable of being demounted and taken out

Abstract

The invention relates to an internal-fixing hollow screw for intercondylar eminence and capable of being demounted and taken out and belongs to the technical field of medical instruments for the orthopedics department. According to the technical scheme, the internal-fixing hollow screw used for fixing the femoral neck intercondylar fracture is characterized in that the self-tapping screw head of the internal-fixing hollow screw is provided with a prismatic connecting hole along an axis direction, the front end of the inner hole of the rod of the hollow screw is a prismatic hole, two ends of a connecting rod are respectively connected with the connecting hole of the self-tapping screw head and the prismatic hole in the front end of the inner hole of the rod of the hollow screw in a matched manner, long inlet holes along the length direction of the rod of the hollow screw are arranged in the middle of the rod of the hollow screw, the long inlet holes are arranged around the rod of the hollow screw in an equal-distance manner, the long edges on two sides of each long inlet hole are sharp chamfers, and the bottom plane of each chamfer intersects with the inner hole wall of the rod of the hollow screw. The internal-fixing hollow screw has the advantages that bone trabecula can grow in the hollow screw at the same time during the growth of the connecting bone of a fracture part, a bionic effect is achieved, patients can start functional exercising earlier, and recovery time is shortened.

Description

technical field [0001] The invention relates to an internal fixation screw for fixing femoral intercondylar ridge fractures, belonging to the technical field of orthopedic medical devices. Background technique [0002] Internal fixation is an irreplaceable and important method in the treatment of intercondylar fractures of the femur. Hollow screw fixation of intercondylar fractures is easy to operate, with less local anatomical separation and shorter operation time. , so intraoperative bleeding is less, and the number of postoperative blood transfusion cases and blood transfusion volume are less. Because there are important bone trabecular structures in cancellous bones such as the ends of the long bones of the limbs, vertebrae, and calcaneus in the human body, they play a key role in maintaining the normal shape and mechanical conduction of bones. However, the implantation of internal fixation after fracture will further damage the trabecular bone structure. The existence ...

AI Technical Summary

Problems solved by technology

However, the implantation of internal fixation after fracture will further damage the trabecular bone structure. The existence of internal fixation will hinder the reconstruction of trabecular bone during the fracture healing process, and cannot effectively restore the local normal structure and mechanical conductivity of the bone, which may lead to local stress concentration. , leading to complications such as internal fixation loosening, withdrawal, fracture, fracture nonunion, and fracture around the internal fixation

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