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    Fluid-structure interaction of a patient-specific abdominal aortic aneurysm treated with an endovascular stent-graft.

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    Authors
    Molony, David S
    Callanan, Anthony
    Kavanagh, Eamon G
    Walsh, Michael T
    McGloughlin, Tim M
    Affiliation
    Centre for Applied Biomedical Engineering Research, Department of Mechanical and Aeronautical Engineering and Materials and Surface Science Institute, University of Limerick, Ireland. david.molony@ul.ie
    Issue Date
    2009
    MeSH
    Aged
    Aortic Aneurysm, Abdominal
    Biomechanics
    Biomedical Engineering
    Blood Vessel Prosthesis
    Blood Vessel Prosthesis Implantation
    Elastic Modulus
    Humans
    Male
    Models, Anatomic
    Models, Theoretical
    Pressure
    Stents
    Stress, Mechanical
    Tomography, X-Ray Computed
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    Citation
    Fluid-structure interaction of a patient-specific abdominal aortic aneurysm treated with an endovascular stent-graft. 2009, 8:24 Biomed Eng Online
    Journal
    Biomedical engineering online
    URI
    http://hdl.handle.net/10147/94016
    DOI
    10.1186/1475-925X-8-24
    PubMed ID
    19807909
    Abstract
    BACKGROUND: Abdominal aortic aneurysms (AAA) are local dilatations of the infrarenal aorta. If left untreated they may rupture and lead to death. One form of treatment is the minimally invasive insertion of a stent-graft into the aneurysm. Despite this effective treatment aneurysms may occasionally continue to expand and this may eventually result in post-operative rupture of the aneurysm. Fluid-structure interaction (FSI) is a particularly useful tool for investigating aneurysm biomechanics as both the wall stresses and fluid forces can be examined. METHODS: Pre-op, Post-op and Follow-up models were reconstructed from CT scans of a single patient and FSI simulations were performed on each model. The FSI approach involved coupling Abaqus and Fluent via a third-party software - MpCCI. Aneurysm wall stress and compliance were investigated as well as the drag force acting on the stent-graft. RESULTS: Aneurysm wall stress was reduced from 0.38 MPa before surgery to a value of 0.03 MPa after insertion of the stent-graft. Higher stresses were seen in the aneurysm neck and iliac legs post-operatively. The compliance of the aneurysm was also reduced post-operatively. The peak Post-op axial drag force was found to be 4.85 N. This increased to 6.37 N in the Follow-up model. CONCLUSION: In a patient-specific case peak aneurysm wall stress was reduced by 92%. Such a reduction in aneurysm wall stress may lead to shrinkage of the aneurysm over time. Hence, post-operative stress patterns may help in determining the likelihood of aneurysm shrinkage post EVAR. Post-operative remodelling of the aneurysm may lead to increased drag forces.
    Language
    en
    ISSN
    1475-925X
    ae974a485f413a2113503eed53cd6c53
    10.1186/1475-925X-8-24
    Scopus Count
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