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Computational Modeling and Experimental Characterization of Hyperelastic Thin Film NiTi for Neurovascular Microstent Applications

[+] Author Affiliations
Youngjae Chun, Hsin-yun Chang, Po-Yu Lin, K. P. Mohanchandra, Michael C. Emmons, Myunghoon Seong, Daniel S. Levi, Allan W. Tulloch, Colin Kealey, David A. Rigberg, Peter F. Lawrence, Gregory P. Carman

University of California, Los Angeles, Los Angeles, CA

Paper No. SMASIS2010-3890, pp. 869-873; 5 pages
doi:10.1115/SMASIS2010-3890
From:
  • ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
  • ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, Volume 1
  • Philadelphia, Pennsylvania, USA, September 28–October 1, 2010
  • Conference Sponsors: Aerospace Division
  • ISBN: 978-0-7918-4415-1 | eISBN: 978-0-7918-3886-0
  • Copyright © 2010 by ASME

abstract

A novel hyperelastic thin film NiTi covered neurovascular microstent was developed for treating wide-neck and fusiform neurovascular aneurysms. This device requires 300–500% recoverable elongation for both collapsing and deployment. Nonlinear buckling and static analysis of Finite Element Modeling (FEM: ANSYS software used) was applied for obtaining critical buckling stress and critical strain values depending on thickness, strut width and pore height. A maximum theoretical critical strain for one geometry as high as 316% while a different experimentally tested film was found to strain 600% elastically without any signs of permanent deformation.

Copyright © 2010 by ASME

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