Computational comparison of the bending behavior of aortic stent-grafts

Autor: Christian Geindreau, Pierre Badel, Stéphane Avril, Laurent Orgéas, Jean-Pierre Favre, Jean-Noël Albertini, Nicolas Demanget
Přispěvatelé: Centre Ingénierie et Santé (CIS-ENSMSE), École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Département Biomécanique et Biomatériaux (DB2M-ENSMSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-CIS, Institut Fédératif de Recherche en Sciences et Ingénierie de la Santé (IFRESIS-ENSMSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-IFR143, UMR 5146 - Laboratoire Claude Goux (LCG-ENSMSE), Laboratoire sols, solides, structures - risques [Grenoble] (3SR), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Joseph Fourier - Grenoble 1 (UJF)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS), Département de Chirurgie Vasculaire (DCV), CHU Saint-Etienne, Institut National Polytechnique de Grenoble, Université Joseph Fourier de Grenoble 1, CNRS UMR 5521, CHu de Saint Etienne, Département de Chirurgie Vasculaire
Rok vydání: 2012
Předmět:
medicine.medical_specialty
Flexibility (anatomy)
Bending
medicine.medical_treatment
0206 medical engineering
Biomedical Engineering
FOS: Physical sciences
02 engineering and technology
030204 cardiovascular system & hematology
Aortic stent
Iliac Artery
Biomaterials
03 medical and health sciences
0302 clinical medicine
Humans
Medicine
von Mises yield criterion
Computer Simulation
[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering
Stent-graft
Mechanical behavior
[PHYS.MECA.BIOM]Physics [physics]/Mechanics [physics]/Biomechanics [physics.med-ph]
Aorta
Mechanical Phenomena
business.industry
Finite element analysis
Reduction rate
[SPI.MECA.BIOM]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Biomechanics [physics.med-ph]
Stent
medicine.disease
Physics - Medical Physics
020601 biomedical engineering
Abdominal aortic aneurysm
Surgery
medicine.anatomical_structure
Torque
Mechanics of Materials
Stents
Vascular Grafting
Medical Physics (physics.med-ph)
Stress
Mechanical
business
Zdroj: Journal of the mechanical behavior of biomedical materials
Journal of the mechanical behavior of biomedical materials, Elsevier, 2012, 5 (1), pp.272-282. ⟨10.1016/j.jmbbm.2011.09.006⟩
ISSN: 1751-6161
1878-0180
DOI: 10.1016/j.jmbbm.2011.09.006
Popis: International audience; Secondary interventions after endovascular repair of abdominal aortic aneurysms are frequent because stent-graft (SG) related complications may occur (mainly endoleak and SG thrombosis). Complications have been related to insufficient SG flexibility, especially when devices are deployed in tortuous arteries. Little is known on the relationship between SG design and flexibility. Therefore, the aim of this study was to simulate numerically the bending of two manufactured SGs (Aorfix--Lombard Medical (A) and Zenith--Cook Medical Europe (Z)) using finite element analysis (FEA). Global SG behavior was studied by assessing stent spacing variation and cross-section deformation. Four criteria were defined to compare flexibility of SGs: maximal luminal reduction rate, torque required for bending, maximal membrane strains in graft and maximal Von Mises stress in stents. For angulation greater than 60°, values of these four criteria were lower with A-SG, compared to Z-SG. In conclusion, A-SG was more flexible than Z-SG according to FEA. A-SG may decrease the incidence of complications in the setting of tortuous aorto-iliac aneurysms. Our numerical model could be used to assess flexibility of further manufactured as well as newly designed SGs.
Databáze: OpenAIRE
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