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Blood flow through the fusiform aneurysm treated with the Flow Diverter stent – Numerical investigations

Reorowicz Piotr, Tyfa Zbigniew, Obidowski Damian, Wiśniewski Karol, Stefańczyk Ludomir, Jóźwik Krzysztof, Levy Michael Lee

Biocybernetics and Biomedical Engineering

2022

Vol. 42, no. 1

375--390

The Flow Diverter is one of the methods used in the treatment of a fusiform aneurysm. While this method is popular in treating anomalies of the cerebral vasculature, it is not commonly used in the treatment of aortic aneurysms. The numerical simulation in a patient-specific model of the abdominal aortal aneurysm allowed us to investigate and visualize the hemodynamics of blood before and after stent implantation. Our custom software (updated version of MeMoS) was used to reproduce the vessel geometry on the basis of imported DICOM image sets. The blood flow was modeled as pulsatile and with non-Newtonian rheology. A velocity distribution, vorticity, a region of stagnation and wall shear stress were plotted to give an insight into the mechanism of operation of Flow Diverter stents. Additionally, a quantitative analysis of the blood distribution among chosen abdominal arteries for one full cardiac cycle was performed. A Flow Diverter stent implanted in the fusiform aneurysmal sack involving the abdominal aorta significantly changed the flow pattern in the region of the aneurysm, but it did not contribute to diminished flow to the renal arteries.