Abstract
In this study we were focusing on visualization of internal flow patterns in central vein dialysis catheter models. Low flow zones and regions with high shear stresses could lead to blood damage or clotting and therefore there is a need to quantify the effect of different existing and new catheter designs. Transparent models of three different catheter designs (straight cut opening, straight opening with a side hole, 45° cut opening) were constructed and investigated. The measurements were done on a scaled model of the in vivo situation. The geometrical scaling factor was 1:2.86. To minimize optical distortion refraction index of working fluid and transparent catheter material was matched. Using dynamic similarity theory, a catheter model flow rate of 0.784L/min was calculated to correspond with 300mL/min in ‘in vivo’ situation. Catheter models were placed in a duct which act as the superior vena cava. A standard 2D PIV (ILA GmbH, Juelich) was employed to visualize the flow statistically in two longitudinal cross-sections of the model. The experiments confirm expected different hemodynamic behavior of the three different prototypes of a central vein dialysis catheter. Further quantification of shear strain values are in process to estimate possible blood damage risk.
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