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Impact of poroelasticity of intraluminal thrombus on wall stress of abdominal aortic aneurysms
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
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2012 (English)In: Biomedical engineering online, ISSN 1475-925X, Vol. 11, 62- p.Article in journal (Refereed) Published
Abstract [en]

Background: The predictions of stress fields in Abdominal Aortic Aneurysm (AAA) depend on constitutive descriptions of the aneurysm wall and the Intra-luminal Thrombus (ILT). ILT is a porous diluted structure (biphasic solid-fluid material) and its impact on AAA biomechanics is controversially discussed in the literature. Specifically, pressure measurements showed that the ILT cannot protect the wall from the arterial pressure, while other (numerical and experimental) studies showed that at the same time it reduces the stress in the wall. Method: To explore this phenomenon further a poroelastic description of the ILT was integrated in Finite Element (FE) Models of the AAA. The AAA model was loaded by a pressure step and a cyclic pressure wave and their transition into wall tension was investigated. To this end ILT's permeability was varied within a microstructurally motivated range. Results: The two-phase model verified that the ILT transmits the entire mean arterial pressure to the wall while, at the same time, it significantly reduces the stress in the wall. The predicted mean stress in the AAA wall was insensitive to the permeability of the ILT and coincided with the results of AAA models using a single-phase ILT description. Conclusion: At steady state, the biphasic ILT behaves like a single-phase material in an AAA model. Consequently, computational efficient FE single-phase models, as they have been exclusively used in the past, accurately predict the wall stress in AAA models.

Place, publisher, year, edition, pages
2012. Vol. 11, 62- p.
Keyword [en]
Pore pressure, Finite element analyses, Poroelasticity, Abdominal aortic aneurysm, Intraluminal thrombus
National Category
Biomedical Laboratory Science/Technology
URN: urn:nbn:se:kth:diva-105674DOI: 10.1186/1475-925X-11-62ISI: 000310053700001ScopusID: 2-s2.0-84865406478OAI: diva2:571556
Swedish Research Council, 2006-7568EU, FP7, Seventh Framework Programme, FAD-200647Vinnova

QC 20121123

Available from: 2012-11-23 Created: 2012-11-23 Last updated: 2012-11-23Bibliographically approved

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Gasser, T. Christian
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