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Proceedings Paper

Fiber laser micromachining of magnesium alloy tubes for biocompatible and biodegradable cardiovascular stents
Author(s): Ali Gökhan Demir; Barbara Previtali; Daniele Colombo; Qiang Ge; Maurizio Vedani; Lorenza Petrini; Wei Wu; Carlo Alberto Biffi
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Paper Abstract

Magnesium alloys constitute an attractive solution for cardiovascular stent applications due to their intrinsic properties of biocompatibility and relatively low corrosion resistance in human-body fluids, which results in as a less intrusive treatment. Laser micromachining is the conventional process used to cut the stent mesh, which plays the key role for the accurate reproduction of the mesh design and the surface quality of the produced stent that are important factors in ensuring the mechanical and corrosion resistance properties of such a kind of devices. Traditionally continuous or pulsed laser systems working in microsecond pulse regime are employed for stent manufacturing. Pulsed fiber lasers on the other hand, are a relatively new solution which could balance productivity and quality aspects with shorter ns pulse durations and pulse energies in the order of mJ. This work reports the study of laser micromachining and of AZ31 magnesium alloy for the manufacturing of cardiovascular stents with a novel mesh design. A pulsed active fiber laser system operating in nanosecond pulse regime was employed for the micromachining. Laser parameters were studied for tubular cutting on a common stent material, AISI 316L tubes with 2 mm in diameter and 0.2 mm in thickness and on AZ31 tubes with 2.5 mm in diameter and 0.2 in thickness. In both cases process parameters conditions were examined for reactive and inert gas cutting solutions and the final stent quality is compared.

Paper Details

Date Published: 15 February 2012
PDF: 9 pages
Proc. SPIE 8237, Fiber Lasers IX: Technology, Systems, and Applications, 823730 (15 February 2012); doi: 10.1117/12.910131
Show Author Affiliations
Ali Gökhan Demir, Politecnico di Milano (Italy)
Barbara Previtali, Politecnico di Milano (Italy)
Daniele Colombo, Politecnico di Milano (Italy)
Qiang Ge, Politecnico di Milano (Italy)
Maurizio Vedani, Politecnico di Milano (Italy)
Lorenza Petrini, Politecnico di Milano (Italy)
Wei Wu, Politecnico di Milano (Italy)
Carlo Alberto Biffi, CNR-IENI (Italy)

Published in SPIE Proceedings Vol. 8237:
Fiber Lasers IX: Technology, Systems, and Applications
Eric C. Honea; Sami T. Hendow, Editor(s)

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