第22卷第1期 2014年1月
文章编号1004-924X(2014)01-0063-06
光学精密工程
Optics and Precision Engineering
可降解心脏支架的飞秒激光精密加工
程萍*，位·迪，吴本科，高峰，陈向东
（合肥工业大学电子科学与应用物理学院，安徽合肥230009）
Vol.22No.1
Jan.2014
摘要：以激光精密加工金属血管心胜支架生产工艺为基础，探索了可降解心脏支架的飞秒激光精密加工方式。利用飞秒激光的超短脉冲和超高峰值功率的特性，实现了以聚乳酸（PLA）为材料的可降解心脏支架的激光精密加工。设计了椅形衬套，稳定了激光焦斑位置，分析得出了最佳衬套离焦距用于配合飞秒激光精密加工。通过调试工艺参量，解决了由于材料本身特性引起的切缝边缘易炭化和加工过程中由于离焦量和焦斑位置准确度不稳定导致不能精密加工的问间题，实现了对非金属可降解心胜支架的无热精密加工。说明了飞秒激光配合椅形村套加工非金属血管支架的可行性，确定
了最佳加工参量，加工出了无热损伤切边光滑筋宽一致性为土6um的可降解心胜支架样品。关键
词：飞秒激光精密加工；可降解心胜支架；静形补套；聚乳酸(PIL.A)
中图分类号：TG665;R318.11
文献标识码：A
doi;10. 3788/OPE.20142201.0063
Femtosecond laser precision machining of biodegradable heart stent
CHENG Ping',WEIDi，WUBen-ke,GAOFeng,CHEN Xiang-dong
(School of Electromic Science and Applied Physics, Hefei University of Technology , Hefei 230009, China)
*Corresponding author,E-mail:ychengping@126.com
Abstract: On the basis of the traditional laser precision machining technologies for metal heart stents, a femtoseconds(fs) laser precision machining technology for a degradable heart stent was explored. By using the ultra-short pulse and ultra high peak power of the fs laser, the laser precision machining was implemented for the degradable heart stent made from the polylactic acid (PLA). A chair shaped bushing was designed to stabilize the laser focal spot position and the best bushing from focal precision machining was obtained to match with fs laser machining. By adjusting technological parameters, the shortcomings of the cutting edge carbonization caused by the characteristics of the material itself and the lower machining precision due to the unstable defocusing and focal spot position were overcome and a nonmetal degradable heart stent method in a no heat precision machining was proposed. Finally, the feasibility of fs laser with chair-shaped bushing to machine a nonmetallic stent was described, the best machining parameters were determined, and a biodegradable stent sample without heat injury trimming and with a smooth band width consistency of ± 6 μ m was machined successfully.
Key words: femtosecond laser; precision machining;biodegradable heart stent; chair shaped bushing
polylactic acid
收稿日期：2013-09-13；修订日期：2013-10-11
基金项目：国家自然科学基金资助项目（No.61154004)