Picosecond laser micromachining of nitinol and platinum-iridium alloy for coronary stent applications

被引：69

作者：

Muhammad, N. ^{[1
]}

Whitehead, D. ^{[1
]}

Boor, A. ^{[2
]}

Oppenlander, W. ^{[2
]}

Liu, Z. ^{[3
]}

Li, L. ^{[1
]}

机构：

[1] Univ Manchester, Laser Proc Res Ctr, Sch Mech Aerosp & Civil Engn, Manchester M13 9PL, Lancs, England

[2] Swiss Tec AG, FL-9494 Schaan, Liechtenstein

[3] Univ Manchester, Ctr Corros & Protect, Sch Mat, Manchester M13 9PL, Lancs, England

来源：

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 2012年 / 106卷 / 03期

关键词：

SHAPE-MEMORY ALLOY; METALLIC STENT; ABLATION; PULSES; UV;

D O I：

10.1007/s00339-011-6609-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The demand for micromachining of coronary stents by means of industrial lasers rises quickly for treating coronary artery diseases, which cause more than one million deaths each year. The most widely used types of laser for stent manufacturing are Nd:YAG laser systems with a wavelength of 1064 nm with pulse lengths of 10(-3)-10(-2) seconds. Considerable post-processing is required to remove heat-affected zones (HAZ), and to improve surface finishes and geometry. Using a third harmonic laser radiation of picosecond laser (6x10(-12) s pulse duration) in UV range, the capability of the picosecond laser micromachining of nitinol and platinum-iridium alloy for coronary stent applications are presented. In this study dross-free cut of nitinol and platinum-iridium alloy tubes are demonstrated and topography analysis of the cut surface is carried out. The HAZ characteristics have been investigated by means of microscopic examinations and measurement of micro-hardness distribution near the cut zones.

引用

页码：607 / 617

页数：11

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