The stent was immerged the mixed solutions of the acetic acid and nitric acid with the proportion of 3:7,5:5,7:3 for 3,5,7 min, respectively. The roughness was checked by surface figure machine(SuFcom750A).

• 首先,我们采用化学腐蚀使支架表面更粗糙,腐蚀剂分别采用冰乙酸和硝酸3:7、5:5、7:3 的比例混合,然后将支架浸入溶液中3、5、7 分钟后取出,采用表面轮廓仪检测支架的表面粗糙度。