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

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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.

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Authors and Affiliations

  1. Dipartimento di Bioingegneria, Politecnico di Milano, Milan, Italy

    Francesco Migliavacca

  2. Dipartimento di Ingegneria Strutturale, Politecnico di Milano, Milan, Italy

    Gabriele Dubini

  3. Laboratory of Biological Structure Mechanics (LaBS), Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milan, Italy

    Francesco Migliavacca, Paolo Massarotti, Silvia Schievano & Gabriele Dubini

  4. Dipartimento di Meccanica Strutturale, Università degli Studi di Pavia, Italy

    Lorenza Petrini, Paolo Massarotti, Silvia Schievano & Ferdinando Auricchio

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  1. Francesco Migliavacca
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  2. Lorenza Petrini
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  4. Silvia Schievano
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  5. Ferdinando Auricchio
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Correspondence to Francesco Migliavacca.

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Migliavacca, F., Petrini, L., Massarotti, P. et al. Stainless and shape memory alloy coronary stents: a computational study on the interaction with the vascular wall. Biomech Model Mechanobiol 2, 205–217 (2004). https://doi.org/10.1007/s10237-004-0039-6

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  • DOI: https://doi.org/10.1007/s10237-004-0039-6

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