Surface treatment method of medical titanium alloy screw

Abstract

The invention provides a surface treatment method of a medical titanium alloy screw, which includes steps of performing oil stain removal treatment on a titanium alloy screw; keeping the titanium alloy screw under a rotating state, and texturing the surface of the titanium alloy screw by a laser, etching or educing micron order or nanoscale surface structure formed by stacking many rings. The invention has the beneficial effects that 1, the titanium alloy screw has unidirectional friction reduction and reverse friction increase effects; 2, the biological compatibility of the screw surface canbe improved; 3, the ring middle part can be used for filling active substance / controlled-release drug through structuring a specific scale of micropore, the textured ring can play a good bearing protection effect and reach a special medical effect; 4, through texturing the surface of the titanium alloy screw by screw, the titanium alloy screw is directly processed in an air environment; the treatment method is directly processed in air environment, free from pollution, quick in speed, free from noise, uniform and tidy in pattern.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a surface treatment method for a special medical titanium alloy screw with one-way friction reduction and reverse friction increase. Background technique [0002] With the development of population aging, the degeneration of human tissue and organ functions, especially the decrease of bone density and bone quality leads to osteoporosis. Various biological implants have been developed to treat these diseases. As a commonly used medical fixation aid, titanium alloy screws often play an extremely important role. The mechanical properties and biocompatibility of the screw determine whether the internal fixation system can work normally. With the rapid development of medical care and the improvement of people's living standards, the requirements for implanted devices are becoming more and more stringent. The structural optimization and performance improvement of titanium al...

AI Technical Summary

Problems solved by technology

[0005] However, the effect that can be improved by changing the structure (length, thread depth, diameter, etc.) of titanium alloy screws is limited, and the biocompatibility and wear resistance of the screw during long-term use cannot be improved.

Through surface treatment, the introduction of active coating on the surface of titanium alloy can effectively improve the bonding force between the screw and the bone and the biocompatibility of the titanium alloy surface. The bonding force between the coatings is poor, and the coatings have substances that fall off. Long-term use will cause difficult problems such as bone resorption.

The process of coating preparation is complicated, and the precise and controllable coating increases the processing cost

Some other heat treatments have changed the structure of the substrate and the coating to a certain extent, making the mechanical properties of the titanium alloy substrate significantly worse.

Images