Inflow method into the V chamber and presence/absence of mesh contribute to the generation of retention and vortex flow conditions

Abstract

[Introduction] We have reported that different structures of the V-chamber affect retention conditions. This study evaluated whether the angle of blood flow into the V-chamber and the presence of a mesh inside the chamber affect blood retention. [Methods] Four V chamber types (horizontal and vertical inflow, with and without mesh) were used in a simulated experiment to evaluate blood retention. The time from the injection of 1 mL of simulated blood into the V-chamber to color disappearance was measured 10 times each. The dye flow in the V-chamber was evaluated visually. [Results] The dye disappearance times were 33 s, 27 s, 120 s, and 120 s for the horizontal inflow with mesh, horizontal inflow without mesh, vertical inflow with mesh, and vertical inflow without mesh groups, respectively. The fluid flow Visual evaluation showed that the fluid flowed uniformly as a swirling flow in the horizontal inflow chamber; in the vertical inflow chamber, the fluid flowed pulsatile and non-uniformly only at the bottom and stagnation was observed at the liquid surface. [Conclusion] Differences in the blood inflow into the V chamber methods contributed to stagnation.