ANALYSIS OF A BIOMECHANICAL FACTOR
AFFECTING TYPE I ENDOLEAKS IN A STENTED ABDOMINAL AORTIC ANEURYSM
Anne AMBLARD
anne.amblard@insa-lyon.fr
Hélène WALTER-LE BERRE
Benyeka BOU-SAÏD
Michel BRUNET
Laboratoire de Mécanique des Contacts et des
Solides, INSA Lyon, FRANCE
Abstract.
In order to improve endovascular graft
used for the treatment of abdominal aortic aneurysm, we develop a
methodology to analyse phenomena of type I endoleaks in a non
invasive stented abdominal aorta. On the one hand, this study
provides an evaluation of the parietal stresses generated by the
blood flow. As blood is a shear-thinning, non-Newtonian fluid, we
use the Phan-Thien and Tanner model, resulting from the polymer
rheology. On the other hand, we develop an axisymmetric
finite-element model of the complete system. Plast2, an explicit
dynamic finite element code, is used to simulate the behavior of the
system subjected to hydrostatic pressure and to the stresses
generated by the blood flow. As the response of the solids is
strongly affected by the response of the fluid, and vice versa, a
coupled fluid-structure interaction is necessary and achieved in
this work.
Keywords:
abdominal aortic aneurysm, endovascular graft, type I endoleaks,
fluid-structure interaction, computational parametric sensitivity
analysis
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