飞秒激光无碎屑加工不锈钢血管支架  

Debris-free Femtosecond Laser Micromachining of Stainless Steel Vascular Stent

作　　者：谢小柱[1,2] 朱裔良 黄亚军 申超 彭清发 王鹏超 龙江游 XIE Xiaozhu;ZHU Yiliang;HUANG Yajun;SHEN Chao;PENG Qingfa;WANG Pengchao;LONG Jiangyou(School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006;State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment,Guangdong University of Technology,Guangzhou 510006)

机构地区：[1]广东工业大学机电工程学院,广州510006 [2]广东工业大学省部共建精密电子制造技术与装备国家重点实验室,广州510006

出　　处：《机械工程学报》2021年第5期251-261,共11页Journal of Mechanical Engineering

基　　金：国家重点研发计划(2018YFB1107700);国家自然科学基金(52075103,51805093);广东省基础与应用基础研究基金区域联合基金重点(20201910250000069)资助项目。

摘　　要：经皮冠状动脉植入血管支架是解决心血管堵塞的主要手段。管状心血管支架主要采用纳秒激光加工,但存在热效应大、熔渣碎屑残留、以及复杂后处理等问题。因此,利用高重复频率红外飞秒激光对不锈钢血管支架进行加工,研究飞秒激光烧蚀作用机理,分析材料的去除过程,研究激光能量密度、平台进给速度、激光脉冲重复频率等加工工艺参数对加工表面的影响规律,研究结果表明:高重复频率低能量密度下飞秒激光加工具有良好的表面质量和加工效率;在激光能量密度、脉冲重复频率、进给速度、气体压力分别为1.99 J/cm^(2)、100 kHz、24.6 mm/min、0.1 MPa时,实现了热影响区小、无碎屑残留且没有重凝层的高质量血管支架切割,并且在其表面加工了直径为30μm的储药孔。Percutaneous coronary intervention(PCI)implantation of the stent is the main method to resolve the cardiovascular blockage.Nanosecond laser-based micromachining of the stent mesh on the microtube exists some problems such as large thermal effect,slag residue and complex post-treatment.An infrared femtosecond laser with high pulse repetition rate is proposed to machine the stainless-steel scaffolds.The femtosecond laser ablation mechanism,the removal process of materials,and the influence rule of laser fluence,feed speed,pulse repetition rate on the processed surface quality are studied respectively.The results present that femtosecond laser machining with high pulse repetition rate and low laser fluence has good surface quality and processing efficiency.Under the laser parameter combinations of laser fluence of,pulse repetition rate of 100 kHz,feeding speed of 24.6 mm/min and 1.99 J/cm2,air gas pressure of 0.1MPa,high-quality vascular scaffolds without re-solidified layer,residual debris and small heat affected zone are obtained.In addition,drug storage holes with a diameter of 30μm were successfully fabricated on the surface of vascular stent.

关 键 词：飞秒激光 血管支架 机理 工艺参数 影响规律 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]