Finite Element Analysis of the Mechanical Performances of 8 Marketed Aortic Stent-Grafts - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of endovascular therapy Année : 2013

Finite Element Analysis of the Mechanical Performances of 8 Marketed Aortic Stent-Grafts

Résumé

Purpose: To assess numerically the flexibility and mechanical stresses undergone by stents and fabric of currently manufactured stent-grafts. Methods: Eight marketed stent-graft limbs (Aorfix, Anaconda, Endurant, Excluder, Talent, Zenith Flex, Zenith LP, and Zenith Spiral-Z) were modeled using finite element analysis. A numerical benchmark combining bending up to 180° and pressurization at 150 mmHg of the stent-grafts was performed. Stent-graft flexibility, assessed by the calculation of the luminal reduction rate, maximal stresses in stents, and maximal strains in fabric were assessed. Results: The luminal reduction rate at 90° was ‹<20% except for the Talent stent-graft. The rate at 180° was higher for Z-stented models (Talent, Endurant, Zenith, and Zenith LP; range 39%-78%) than spiral (Aorfix, Excluder, and Zenith Spiral-Z) or circular-stented (Anaconda) devices (range 14%-26%). At 180°, maximal stress was higher for Z-stented stent-grafts (range 370-622 MPa) than spiral or circular-stented endografts (range 177-368 MPa). At 90° and 180°, strains in fabric were low and did not differ significantly among the polyester stent-grafts (range 0.5%-7%), while the expanded polytetrafluoroethylene fabric of the Excluder stent-graft underwent higher strains (range 11%-18%). Conclusion: Stent design strongly influences mechanical performances of aortic stentgrafts. Spiral and circular stents provide greater flexibility, as well as lower stress values than Z-stents, and thus better durability.
Fichier principal
Vignette du fichier
ND-JET-20-Orig.pdf (475.92 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-00880940 , version 1 (07-11-2013)

Identifiants

Citer

Nicolas Demanget, Ambroise Duprey, Pierre Badel, Laurent Orgéas, Stéphane Avril, et al.. Finite Element Analysis of the Mechanical Performances of 8 Marketed Aortic Stent-Grafts. Journal of endovascular therapy, 2013, 20 (4), pp. 523-535. ⟨10.1583/12-4063.1⟩. ⟨hal-00880940⟩
447 Consultations
1775 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More