Wed April 6th 2016
16:00 – 16:30
ZH286
Seminar In vitro comparison of aortoiliac stent configurations
Erik Groot Jebbink

Details:

Atherosclerotic plaque can develop into flow limiting stenosis, causing symptoms of claudication. These symptoms can progress leading to the point where amputation is needed. Treatment nowadays is performed using minimal invasive endovascular techniques. Catheters are used to deploy stents at the level of the lesions. When treating lesions at the aortic bifurcation this is challenging, giving rise to several treatment possibilities.
Previous studies have shown a relationship between stent patency and the configuration of the stents, possibly due to blood flow perturbations. To investigate which configuration is hemodynamically most optimal we developed an in vitro circulatory system and identical vessel phantoms. In the phantoms several stent configurations are deployed. 2D Laser PIV techniques are used to visualise and quantify the flow around the stents. We have shown that the covered kissing stent configuration shows large recirculation, is prone to low wall shear stress and low oscillatory shear index near the inflow of the configuration. These conditions are ideal for edge stenosis to develop. Furthermore we have shown that the bare metal self-expanding stents are prone to have a stagnation zone between the anatomical and neo-bifurcation, an ideal situation for thrombus to grow. The CERAB configuration shows less recirculation and is less prone to stagnation zones.
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Max Planck Gesellschaft
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