SYMPOSIA PAPER Published: 01 January 2007
STP45243S

Experimental Studies of NiTi Self-Expanding Stent Designs

Source

Preliminary investigations to apply thermoelastic stress analysis (TSA) to Nitinol selfexpanding stents are described. Tests conducted at high resolution indicated that a viable thermoelastic signal can be obtained from the fine stent structure. It is shown that it is possible to digitally compensate for errors arising from motion at this high resolution. High variability in Nitinol's material properties with stress and temperature result in a complex thermoelastic response. Correction strategies are proposed to account for variation in material properties and to minimize errors due to thermal variations in order to derive calibration factors for the austenite and martensite material phases. The greatest challenge is identified as calibrating the thermoelastic response from the radially loaded stent structure where it is likely the material is highly inhomogeneous.

Author Information

Eaton-Evans, J.
Department of Mechanical and Aeronautical Engineering, University of Limerick, Ireland
Dulieu-Barton, J.
School of Engineering Sciences, University of Southampton, UK
Little, E.
Department of Mechanical and Aeronautical Engineering, University of Limerick, Ireland
Brown, I.
Department of Mechanical and Aeronautical Engineering, University of Limerick, Ireland
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Details
Developed by Committee: F04
Pages: 98–109
DOI: 10.1520/STP45243S
ISBN-EB: 978-0-8031-6237-2
ISBN-13: 978-0-8031-4511-5