Experimentally validated simulation of coronary stents considering different dogboning ratios and asymmetric stent positioning


Autoři: Lisa Wiesent aff001;  Ulrich Schultheiß aff004;  Christof Schmid aff005;  Thomas Schratzenstaller aff002;  Aida Nonn aff001
Působiště autorů: Computational Mechanics and Materials Lab, Ostbayerische Technische Hochschule (OTH) Regensburg, Regensburg, Germany aff001;  Regensburg Center of Biomedical Engineering (RCBE), Regensburg, Germany aff002;  Medical Device Lab, OTH Regensburg, Regensburg, Germany aff003;  Material Science and Surface Analytics Lab, OTH Regensburg, Regensburg, Germany aff004;  University Hospital Regensburg, Cardiothoracic and Cardiovascular Surgery, Regensburg, Germany aff005
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article
doi: 10.1371/journal.pone.0224026

Souhrn

In-stent restenosis remains a major problem of arteriosclerosis treatment by stenting. Expansion-optimized stents could reduce this problem. With numerical simulations, stent designs/ expansion behaviours can be effectively analyzed. For reasons of efficiency, simplified models of balloon-expandable stents are often used, but their accuracy must be challenged due to insufficient experimental validation. In this work, a realistic stent life-cycle simulation has been performed including balloon folding, stent crimping and free expansion of the balloon-stent-system. The successful simulation and validation of two stent designs with homogenous and heterogeneous stent stiffness and an asymmetrically positioned stent on the balloon catheter confirm the universal applicability of the simulation approach. Dogboning ratio, as well as the final dimensions of the folded balloon, the crimped and expanded stent, correspond well to the experimental dimensions with only slight deviations. In contrast to the detailed stent life-cycle simulation, a displacement-controlled simulation can not predict the transient stent expansion, but is suitable to reproduce the final expanded stent shape and the associated stress states. The detailed stent life-cycle simulation is thus essential for stent expansion analysis/optimization, whereas for reasons of computational efficiency, the displacement-controlled approach can be considered in the context of pure stress analysis.

Klíčová slova:

Catheters – Deformation – Jaw – Life cycles – Simulation and modeling – Stent implantation – Stiffness – Coronary stenting


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Článek vyšel v časopise

PLOS One


2019 Číslo 10