Cardiac single ventricle birth defects are a leading cause of death among birth defects for children under one years of age. Fontan palliation is the current clinical treatment for patients with these birth defects and result in a single working ventricle to power the entire system by forming a total cavopulmonary connection (TCPC). A significant number of patients with univentricle Fontan circulation develop Fontan failure caused by the inability of the single ventricle to power the Fontan circulation. The use of mechanical cavopulmonary assist device has been proposed as a treatment for these patients. Particularly, the application of a percutaneous, catheter driven, viscous impeller pump (VIP) has been identified to provide promising cavopulmonary support [1]. Computational Fluid Dynamics (CFD) simulations have demonstrated that this VIP pump can satisfactorily augment cavopulmonary blood flow at pressures sufficient to overcome increased downstream resistance. Experimental characterization of flow induced by the VIP in the TCPC, including detailed flow structures and hemodynamic performances, needs to be conducted for minimizing risk of hemolysis and thrombosis while maximizing the pump performance, and for validating the results from high-fidelity CFD simulations.

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