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Laser microfabrication of L605 cobalt-chromium cardiovascular stent implants with modulated pulsed Nd:YAG laser

[+] Author Affiliations
S. K. Sudheer

Vellore Institute of Technology University, School of Electrical Sciences, Photonics and Microwave Division, Vellore-632014, India

Devesh Kothwala

Sahajanand Medical Technologies, Research and Development Division, Parsi Street, Saiyedpura, Surat-395003, Gujarat, India

S. Prathibha

Vellore Institute of Technology University, School of Science and Humanities, Organic and Inorganic Chemistry Division, Vellore-632014, Tamilnadu, India

Chhaya Engineer

Sahajanand Medical Technologies, Research and Development Division, Parsi Street, Saiyedpura, Surat-395003, Gujarat, India

Ankur Raval

Sahajanand Medical Technologies, Research and Development Division, Parsi Street, Saiyedpura, Surat-395003, Gujarat, India

Haresh Kotadia

Sahajanand Medical Technologies, Research and Development Division, Parsi Street, Saiyedpura, Surat-395003, Gujarat, India

J. Micro/Nanolith. MEMS MOEMS. 7(3), 033012 (August 05, 2008). doi:10.1117/1.2965539
History: Received September 16, 2007; Revised May 18, 2008; Accepted May 29, 2008; Published August 05, 2008
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Photonics modulation techniques can be effectively used for the laser microfabrication of biomedical implants to achieve better flexibility and control of the available optical power. These enable the processing and manufacturing of biomedical implants like cardiovascular stents and micro-metallic components with reduced heat affected zone (HAZ) and extremely precise edge cutting. Our investigation deals with the study of acousto-optic modulation of a pulsed Nd:YAG laser beam and further profile cutting of thin cobalt-chromium tubes for cardiovascular stent manufacturing. The acousto-optic modulator used in the investigations is a Bragg diffraction device. During one piercing process, the focused laser power is gradually varied from a low value and reaches the maximum as the beam goes deeper into the material. The optimum value for dwell time during which the laser piercing is occurring is found as 58ms. A 14-step staircase modulating voltage with a maximum AC component of 900mV was used, and the laser power was 4.4W in TEM00 operation. Pulsed Nd:YAG laser modulated using an acousto-optic device in the Bragg regime is capable of cutting extremely complex geometries of stents on L605 tubing. Laser cutting resulted in a kerf width of 22.5±0.5μm. Precise strut dimensions of 112±15μm for the subsidiary strut, 140±15μm for the main strut, and 140±15μm for the link were also obtained. Scanning electron microscopy (SEM) images of L605 stents illustrate the higher strength Co-Cr alloy L605 with the same ductility, its ability to be translated into thinner struts, and improved deliverability. L605 also exhibits enhanced radio visibility thanks to its tungsten content and exceptional work hardening rate for a uniform expansion with minimal recoil.

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© 2008 Society of Photo-Optical Instrumentation Engineers

Citation

S. K. Sudheer ; Devesh Kothwala ; S. Prathibha ; Chhaya Engineer ; Ankur Raval, et al.
"Laser microfabrication of L605 cobalt-chromium cardiovascular stent implants with modulated pulsed Nd:YAG laser", J. Micro/Nanolith. MEMS MOEMS. 7(3), 033012 (August 05, 2008). ; http://dx.doi.org/10.1117/1.2965539


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