电解抛光提高镍钛合金心血管支架表面性能

Improving Surface Properties of Nitinol Cardiovascular Stent by Electropolishing

植入高性能的心血管支架是治疗心血管疾病的主要手段,而支架的制造工艺决定了其表面性能。采用乙二醇-氯化钠无毒电解液电解抛光工艺来提高镍钛合金心血管支架的表面完整性和生物相容性。试验结果表明,该工艺制造镍钛合金心血管支架的表面完整性和生物相容性明显改善:镍钛合金心血管支架表面光亮平整,没有熔渣和热影响区,表面粗糙度达到Ra 85.5 nm;镍钛合金心血管支架表面化学成分发生改变,表面形成二氧化钛保护膜,阻止了Ni离子析出,且电化学腐蚀性能明显提高,有效改善了支架生物相容性;该工艺采用醇-盐无毒电解液进行抛光,提高了工艺对环境的友好性。此外,该工艺解决了镍钛合金心血管支架制造领域的关键技术难题,制造出了性能优良的镍钛合金心血管支架,为高质量心血管支架制造提供了科学依据。

Implantation of high-performance cardiovascular stents is the main method for the treatment of cardiovascular diseases,and the manufacturing process of stents determines their surface performance.For improving the surface integrity and biocompatibility of cardiovascular stents,glycol-sodium non-toxic electrolyte electrolytic polishing process was used.The results showed that the surface integrity and biocompatibility of the cardiovascular stent manufactured by this process was significantly improved.The surface of the cardiovascular stent is smooth and bright,without dross and heat affected zone and the surface roughness reached Ra 85.5 nm.The surface chemical composition of nitinol cardiovascular stent was changed,titanium dioxide protective film was formed on the surface which prevents the precipitation of Ni ions,and the electrochemical corrosion performance is significantly improved,which effectively improved the biocompatibility of the stent.The process used alcohol-salt non-toxic electrolyte for polishing,which improved the environmental friendliness of the process.In addition,this process solved the key technical problems in the manufacturing of nitinol cardiovascular stent,and produced nitinol cardiovascular stent with excellent performance,which provided scientific basis for the manufacturing of high-quality cardiovascular stent.