0
research-article

Finite Element Stent Modeling for the Post-Operative Analysis of Transcatheter Aortic Valve Implantation

[+] Author and Article Information
Raoul Hopf

Institute of Mechanical Systems Department of Mechanical Engineering ETH Zurich Zurich, 8012 Switzerland
rhopf@ethz.ch

Michael Gessat

Hybrid Laboratory for Cardiovascular Technologies Division of Cardiocascular Surgery UniversityHospital Zurich Zurich, 8091 SwitzerlandComputer Vision Laboratory ETH Zurich Zurich, 8092 Switzerland
michael.gessat@gmail.com

Christoph Russ

Computer Vision Laboratory ETH Zurich Zurich, 8092 Switzerland
russc@vision.ee.ethz.ch

Simon H. Sündermann

Klinik für Herz-Thorax-Gefässchirurgie Deutsches Herzzentrum Berlin Berlin, 13353 Germany
suendermann@dhzb.de

Volkmar Falk

Klinik für Herz-Thorax-Gefässchirurgie Deutsches Herzzentrum Berlin Berlin, 13353 Germany
falk@dhzb.de

Edoardo Mazza

Institute of Mechanical Systems Department of Mechanical Engineering ETH Zurich Zurich, 8012 SwitzerlandSwiss Federal Laboratories for Materials Testing and Research EMPA Däbendorf Switzerland
mazza@imes.mavt.ethz.ch

1Corresponding author.

ASME doi:10.1115/1.4036334 History: Received June 23, 2016; Revised February 22, 2017

Abstract

In order to evaluate the performance of stents used in transcatheter aortic valve implantation (TAVI), finite element simulations are set up to reconstruct patient specific contact forces between implant and its surrounding tissue. Previous work used structural beam elements to set-up a numerical model of the CoreValve stent used in TAVI and developed a procedure for implementing kinematic boundary conditions from noisy CT scanning data. This study evaluates element size selection and quantitatively investigates the choice of a linear elastic constitutive model for the Nitinol stent under physiological loading conditions. It is shown that this simplification leads to reliable results and enables a huge reduction in computation time. Further, the procedure used to compensate for noisy postoperative CT data is tested by adding artificial noise. It is concluded, that for physiologically relevant loading ranges, the procedure yields convergent results and successfully eliminates the influence of the noise.

Copyright (c) 2017 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In