Locking screw provided with porous surface and used for bone connection and fixation

Abstract

The invention relates to a locking screw provided with a porous surface and used for bone connection and fixation, and aims to solve the technical problem of bone absorption between the locking screw and residual bone in a long-term use process of the locking screw, so that the locking screw and the bone are tightly combined and are not loosened. The locking screw is characterized by comprising a screw head part, a screw neck part and a shaft bar which are sequentially connected into a whole from top to bottom, wherein the screw head part adopts an inverted circular truncated cone shape which is big end up, the screw neck part is cylindrical, the lower bottom surface of the circular truncated cone has the equivalent area with the cylinder, threads are formed on the side surfaces of the screw head part and the screw neck part respectively, and a porous layer with the aperture of 50-800 mu m is arranged on the side surface of the shaft bar. Besides, the locking screw is made of a titanium alloy, or pure titanium and the like. The locking screw provided with the porous surface and used for bone connection and fixation has the benefits as follows: pitches of the threads at the screw head part and the screw neck part of the locking screw are different, the locking effect is achieved accordingly, the porous part on the side surface of the shaft bar and the host bone have osseointegration in a shorter time, so that the screw and the host bone are tightly combined, and long-term stability is achieved.

Description

technical field [0001] The invention relates to a locking screw with a porous surface for connecting and fixing bones, in particular to a locking screw used for connecting and fixing an implanted artificial prosthesis and residual bone in bone defect medical surgery, and belongs to the technical field of orthopedic surgical instruments. Background technique [0002] Human bones are caused by bone defects due to tumors, trauma, etc., and screws are usually used to fix the artificial prosthesis on the residual bone. Some of these screws are used for temporary fixation, and some will be used for long-term fixation and become permanent implants. Compared with conventional screws, the locking screws are not easy to loosen, and the fixing effect is good. However, the biocompatibility between the locking screw and the bone is still poor, and it cannot be combined precisely, and the screw channel is easy to loosen during long-term use. In addition, due to excessive stress, bone res...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a locking screw with a porous surface for bone connection and fixation, which solves the technical problem of bone resorption between the locking screw and the remaining bone during long-term use, so that the tight connection between the locking screw and the bone is not loose

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