Mesh construction and computational analysis of the biomechanics of an endovascular intervention in cerebral aneurysms using Kirchhoff-Love shells

MUZI, NICOLÁS; FRANCESCO CAMUSSONI; MOYANO, LUIS G.; DANIEL MILLÁN

Rio de Janeiro

Congreso; XLII Ibero-Latin-American Congress on Computational Methods in Engineering (CILAMCE-2021) and 3rd Pan American Congress on Computational Mechanics; 2021

The mechanism of aneurysm rupture is still not fully understood. The rupture risk of the intervention mayincrease during endovascular occlusions of cerebral aneurysms due to a localized load in the parent vessel closeto the neck, a common day-to-day situation. As a first attempt on the road towards developing a plausible anal-ysis capable of dealing with many cases in a statistical sense, we describe the deformation kinematics using ageometrically nonlinear thin shell model under Kirchhoff-Love?s assumptions in conjunction with a simplisticKirchhoff-St. Venant?s hyperelastic material model. Though it cannot assess the artery?s complexity, this morestraightforward yet not trivial approach enable us to statistically study the application of a concentrated load inmany locations, which mimics the action of an instrument during the endovascular treatment. We performed nu-merical simulations on 34 cases from the AneuriskWeb Database. We present preliminary results considering asmoothly varying thickness between the parent vessel and the aneurysm dome, focusing in the mesh constructionprocess and loading.