Lumen reconstruction of covered stents for numerical simulation of thrombosis risk

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Abstract Covered stents are increasingly used in the treatment of aortoiliac occlusions and aneurysms. However, the presence of a polymeric cover may inhibit endothelialization and alter blood flow, potentially increasing the risk of thrombosis. Accurate geometric models of the stent lumen are crucial for computational fluid dynamics (CFD) simulations for thrombosis risk assessment. This study presents a workflow combining silicone casting, μCT imaging, and CFD for thrombosis risk assessment. Applied to a Gore Viabahn VBX stent, the workflow achieved high accuracy with deviations below 0.1mm. CFD simulations identified low wall shear stress regions downstream of cover-induced constrictions, critical for thrombus formation. This approach offers valuable insights for stent design optimization.

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