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Drag Forces on Stent-Grafts

        Abdominal aortic aneurysm (AAA) is the abnormal ballooning of the abdominal aorta. If left untreated, an AAA will continue to expand until it ruptures. The rupture of an artery can lead to severe internal bleeding. In the past open repair was the only available treatment which is usually traumatic and stressful experience. In the recent years an alternative procedure has been developed where the stent-graft is introduced, via iliac vessels into the AAA site. If placed correctly, blood will flow through the stent-graft and relieve the stress on the AAA walls, which eventually heals in the due course of time.

        In this Lab, computational Fluid-Structure Interaction (FSI) technique for compliant arteries and grafts is used to investigate the pulsating displacement forces on a stent-graft within an artery and to understand how these forces translate into motion of the stent-graft. The Velocity and the Pressure profiles from the Particle Image Velocimeter (PIV) will be used as the input parameters and the boundary conditions for the FSI computation. The FSI computation is then compared with the experimental displacement forces as recorded in-vitro model. Several different variations of stent-graft geometries are being studied. This research is being conducted in collaboration with Cleveland Clinic Foundation and Case Western Reserve University.

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by zopeown last modified 2007-12-05 10:52