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To exclude cerebral aneurysms from the parent artery circulation, Flow Diverters (FD), which are designed as stents with a dense mesh, are placed across the neck of the aneurysm. The desired result of this procedure is the reduction of blood flow velocities and pressures inside the aneurysm to prevent rupture.
Computational Fluid Dynamics (CFD) can be employed using the concept of virtual surgery to simulate the effects of the FD and ensure a successful treatment. Here, we present a comparison between simulation of the FD porosity using Darcy’s law (Siemens AG, CFD Research Prototype) with simulations using the actual geometry (DynaCT, Siemens AG, STAR-CCM+, CD-adapco).
Geometry-based simulations demonstrated a strong pressure-drop inside the aneurysm relative to the proximal parent artery. Residual flow was visible in the artery segment not included inside the FD. Inflow into the aneurysms, identified by both methods, coincided with the location of high pressure on the simulated FD.