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

Faidon Kyriakou, David Bow, William Dempster, Robbie Brodie, David Nash

Research output: Contribution to journalArticle

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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.
Original languageEnglish
Pages (from-to)144-156
Number of pages13
JournalAnnals of Biomedical Engineering
Volume48
Issue number1
Early online date17 Jul 2019
DOIs
Publication statusPublished - 1 Jan 2020

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Stents
Stiffness
Grafts
Error analysis
Numerical models
Geometry
Costs

Keywords

  • stent
  • finite element analysis
  • aneurysm
  • ring bundle
  • anaconda

Cite this

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title = "Evaluation of a new approach for modelling full ring stent bundles with the inclusion of manufacturing strains",
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.",
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Evaluation of a new approach for modelling full ring stent bundles with the inclusion of manufacturing strains. / Kyriakou, Faidon; Bow, David; Dempster, William; Brodie, Robbie; Nash, David.

In: Annals of Biomedical Engineering , Vol. 48, No. 1, 01.01.2020, p. 144-156.

Research output: Contribution to journalArticle

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