血管支架筋宽误差分析及激光加工工艺优化

Width Error Analysis of Stent Strut and Optimization of Laser Cutting Procedure

为解决血管支架激光切割中普遍存在筋宽不均匀的问题,通过激光切割工艺试验及对管材的运动分析,得出影响筋宽的主要因素包括系统误差造成的管材切割点切向速度变化和激光离焦量．根据研究结果,优化了激光切割参数．限制管材回转偏心在0．030 mm以下,并设置激光离焦量为-0．05 mm(设备显示值),筋宽变化幅度控制在0.010 mm以内,满足设计要求．

To solve the problem of uneven strut widths of stents cut by laser, laser cutting procedure test was conducted, and the motion of the tube was analyzed. The results show that the deviation of the strut width is mainly caused by the variation in laser defocus and that in the tangent velocity at the cutting point. The procedure parameters were optimized according to the above analysis. The strut widths of the stent cut with the optimized procedure vary within 0. 010 mm, conforming to the design specifications, when the eccentricity of tube at cutting point is within 0. 030 mm and the defocus is -0.05 mm.