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To assess the hemodynamics associated with clot captured within two different types of inferior vena cava (IVC) filters.

Computational flow models were constructed for different clot sizes and shapes captured within the Greenfield (GF) (Medi-tech/Boston Scientific, Watertown, Massachusetts) and TrapEase (Cordis, Miami Lakes, Florida) IVC filters. Two models were employed; one was a straight tube (ST), and the other was a realistic model (RM) that included iliac and renal veins and lumbar curvature, with filter deployment between these inflows. Calculations were based on the Lattice Boltzmann method (LBM), allowing for accurate modeling of flows that are in transition from laminar to turbulent.

Flow disturbances were noted downstream of captured clots, with turbulence intensities reaching 41%. Disturbances were strongest with large clot volumes and in ST models. The RM …