A kind of surface treatment method of medical degradable metal interventional stent

Abstract

The invention provides a surface treatment method for a degradable metal intervention stent, comprising the following steps: 1. performing sandblasting on the degradable metal intervention stent; 1. Ultrasonic cleaning treatment, and then vacuum drying; 3. Electrolytic polishing; 4. Submerging in deionized water and absolute ethanol for the second ultrasonic cleaning treatment, and then vacuum drying; 5. Passivation. The degradable metal interventional stent treated by the invention has good surface quality and high smoothness, can be placed in the atmosphere for a long time, and the corrosion resistance is significantly improved.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of medical metal materials, and in particular relates to a surface treatment method of a medical degradable metal interventional bracket. Background technique [0002] For a long time, cardiovascular and cerebrovascular diseases have been the number one killer threatening human health. With the development of endovascular treatment technology, endovascular stent implantation has become one of the most effective methods for the treatment of cardiovascular diseases. Stent materials commonly used in early clinical applications include stainless steel, titanium and titanium alloys, and Co-Cr alloys. Although these materials can exist in the human body for a long time as foreign bodies, they will cause excessive proliferation of the vascular intima and cause restenosis of the vascular wall, eventually leading to implant failure. [0003] In recent years, degradable metal scaffold materials ...

AI Technical Summary

Problems solved by technology

For hollow stents with complex patterns, mechanical polishing in the traditional sense is difficult to operate and has low efficiency. Currently, vascular stents in clinical use are all electropolished.

But there is less electrolytic polishing for degradable metals, especially in the medical field

A small number of studies use perchloric acid-absolute ethanol solution as the electrolytic polishing solution, which is prone to explosion

However, the phosphoric acid and polyol system is complicated, which makes the preparation of the electrolyte difficult, and the repeatability and stability are poor.