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Stainless and shape memory alloy coronary stents: a computational study on the interaction with the vascular wall

  • Francesco MigliavaccaEmail author
  • Lorenza Petrini
  • Paolo Massarotti
  • Silvia Schievano
  • Ferdinando Auricchio
  • Gabriele Dubini
Original Paper

Abstract

Balloon-expandable and self-expandable stents are the two types of coronary stents available. Basically, they differ in the modality of expansion.

The present study analyses the stress state induced on the vascular wall, by the expansion of balloon- and self-expandable stents, using the finite element method. Indeed, modified mechanical stress state is in part responsible in the restenosis process. The balloon-expandable stents herein investigated are assumed to be made of stainless steel, while the self-expandable stents are made of a shape memory alloy. The effects of the severity of the coronary stenosis, the atherosclerotic plaque stiffness and the stent design are investigated. Comparing the self-expandable stent with the balloon-expandable one, the former induces fewer stresses and lower damage to the vessel, but, on the other hand, its lower stiffness induces a lower capability to restore vasal lumen and to contrast arterial elastic recoil.

Keywords

Austenite Martensite Shape Memory Alloy NiTi Alloy Neointimal Hyperplasia 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Francesco Migliavacca
    • 1
    • 3
    Email author
  • Lorenza Petrini
    • 4
  • Paolo Massarotti
    • 3
    • 4
  • Silvia Schievano
    • 3
    • 4
  • Ferdinando Auricchio
    • 4
  • Gabriele Dubini
    • 2
    • 3
  1. 1.Dipartimento di BioingegneriaPolitecnico di MilanoMilanItaly
  2. 2.Dipartimento di Ingegneria StrutturalePolitecnico di MilanoMilanItaly
  3. 3.Laboratory of Biological Structure Mechanics (LaBS)Politecnico di MilanoMilanItaly
  4. 4.Dipartimento di Meccanica StrutturaleUniversità degli Studi di PaviaItaly

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