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Proceedings Paper

Machining of superelastic instruments for minimal invasive surgery with ultrashort laser pulses
Author(s): Heinz Haferkamp; Alexander von Busse; Jens Bunte; M. Fargas; M. Hustedt; Stefan Paschko
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Paper Abstract

In the course of increasing miniaturization of components in minimal access surgery the superelastic properties of nickel titanium shape memory alloys (NiTi-SMA) find more and more attention. However, only a few processes are available for machining of miniaturized NiTi-components. Changes of the mechanical properties due to heat input or mechanical tensions have to be avoided. Especially for complex geometries with dimensions in the submillimeter-range, these requirements are hardly to meet. Finding new methods for manufacturing micro-instruments of NiTi wires with high geometrical resolution and superelastic mechanical properties for applications in endoscopic surgery are the main goals of the investigations presented here. Because of the precise focussing properties and the possibility of an excellent non-tactile energy coupling, material processing by lasers is a suitable alternative to conventional machining-processes. Comparing investigations with laser systems with different wavelengths and pulse duration show the suitability of ultra-short pulse Ti:Sapphire lasers for this machining process. Only by the use of ultra-short laser pulses it is possible to structure micro-components of NiTi almost without thermal influence. Results of mechanical and metallographic examinations show that the special properties of miniaturized SMA-components can be maintained. Experimental results as well as example geometries produced with ultra-short pulse lasers are presented in the paper.

Paper Details

Date Published: 1 June 2004
PDF: 7 pages
Proc. SPIE 5340, Commercial and Biomedical Applications of Ultrafast Lasers IV, (1 June 2004); doi: 10.1117/12.530211
Show Author Affiliations
Heinz Haferkamp, Laser Zentrum Hannover e.V. (Germany)
Alexander von Busse, Laser Zentrum Hannover e.V. (Germany)
Jens Bunte, Laser Zentrum Hannover e.V. (Germany)
M. Fargas, Laser Zentrum Hannover e.V. (Germany)
M. Hustedt, Laser Zentrum Hannover e.V. (Germany)
Stefan Paschko, Laser Zentrum Hannover e.V. (Germany)

Published in SPIE Proceedings Vol. 5340:
Commercial and Biomedical Applications of Ultrafast Lasers IV
Joseph Neev; Christopher B. Schaffer; Andreas Ostendorf, Editor(s)

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