引用本文:孙晓宇,魏修亭,李志永,王永琪,刘汉卿,娄徳大.电解抛光提高镍钛合金心血管支架表面性能∗[J].中国表面工程,2021,34(1):70~75
Sun Xiaoyu,Wei Xiuting,Li Zhiyong,Wang Yongqi,Liu Hanqing,Lou Da.Improving Surface Properties of Nitinol Cardiovascular Stent by Electropolishing[J].China Surface Engineering,2021,34(1):70~75
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电解抛光提高镍钛合金心血管支架表面性能∗
孙晓宇1, 魏修亭1, 李志永1, 王永琪1, 刘汉卿1, 娄徳大2
1.山东理工大学机械工程学院 淄博 255049;2.威海维心医疗股份有限公司 威海 264200
摘要:
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。
关键词:  镍钛心血管支架  电解抛光  无毒电解液  表面完整性  生物相容性
DOI：10.11933/j.issn.1007-9289.20201222001
分类号:TG156;TB114
基金项目:国家自然科学基金(51775321)和山东省教育厅的重点研发计划(公益类)(2017GGX30116)资助项目
Improving Surface Properties of Nitinol Cardiovascular Stent by Electropolishing
Sun Xiaoyu1, Wei Xiuting1, Li Zhiyong1, Wang Yongqi1, Liu Hanqing1, Lou Da2
1.School of Mechanical Engineering, Shandong University of Technology, Zibo 255049 , China;2.Weihai Visee Medical Device Co., Ltd., Weihai 264200 , China
Abstract:
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 envi- ronmental friendliness of the process. In addition, this process solved the key technical problems in the manufacturing of nitinol cardio- vascular stent, and produced nitinol cardiovascular stent with excellent performance, which provided scientific basis for the manufactur- ing of high-quality cardiovascular stent.
Key words:  nitinol cardiovascular stent  electrolytic polishing  non-toxic electrolyte  surface integrity  biocompatibility
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