Evaluation of a new approach for modelling full ring stent bundles with the inclusion of manufacturing strains

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Kyriakou, Faidon and Bow, David and Dempster, William and Brodie, Robbie and Nash, David (2020) Evaluation of a new approach for modelling full ring stent bundles with the inclusion of manufacturing strains. Annals of Biomedical Engineering, 48 (1). pp. 144-156. ISSN 0090-6964 (https://doi.org/10.1007/s10439-019-02322-0)

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Abstract

Ring stent bundles have been used in several biomedical stent-graft devices for decades, yet in the published literature, the numerical models of these structures always present significant simplifications. In this paper, a finite element (FE) ring stent bundle has been developed and evaluated with a combination of beam and surface elements. With this approach, the shape, the global stiffness and the strains of the structure can all be well predicted at a low computational cost while the approach is suitable for application to non-symmetrical, patient-specific implant simulations. The model has been validated against analytical and experimental data showing that the manufacturing strains can be predicted to a 0.1% accuracy and the structural stiffness with 0–7% precision. The model has also been compared with a more computationally expensive FE model of higher fidelity, revealing a discrepancy of 0–5% of the strain value. Finally, it has been shown that the exclusion of the manufacturing process from the simulation, a technique used in the literature, quadruples the analysis error. This is the first model that can capture the mechanical state of a full ring stent bundle, suitable for complex implant geometry simulations, with such accuracy.

ORCID iDs

Kyriakou, Faidon ORCID logoORCID: https://orcid.org/0000-0001-6759-8033, Bow, David ORCID logoORCID: https://orcid.org/0000-0003-0146-9671, Dempster, William ORCID logoORCID: https://orcid.org/0000-0001-8918-3832, Brodie, Robbie and Nash, David;
CORE (COnnecting REpositories)