Regensburg 2010 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 32: Topical Session Multifunctional Materials I

MM 32.1: Topical Talk

Wednesday, March 24, 2010, 10:15–10:45, H6

Fabrication of TiNi thin film stents — Rodrigo Lima de Miranda, Christiane Zamponi, and •Eckhard Quandt — Kaiserstrasse 2, 24143 Kiel

The success of stents and other medical implants, which conventionally consist of thin walled, laser structured tubes based on superelastic TiNi on the one hand, and the limitations regarding the miniaturization of these medical devices on the other hand, has motivated the application of thin film technology as an attractive alternative approach for some applications, e.g. devices for small vessels.

This work introduce the fabrication and characterization of structured cylindrical TiNi thin films by magnetron sputtering, lithography and wet etching based on previous developments of shape memory alloy films. The TiNi thin films devices fabricated in this work have high potential for application as vascular implants, e.g. stents.

The deposition of TiNi thin films on a cylindrical substrate employs a specific device which allows an in situ rotation of the substrate during the sputtering process. The mechanical properties of the deposited cylindrical TiNi films were tested by tensile testing. Axial and radial directions of the film were tested and both film directions showed comparable mechanical properties with TiNi planar films. Superelastic plateau, closed loop hysteresis and a strain up to 6 % were observed.