2018 Volume Annual56 Issue Abstract Pages S29
The effect of outlet angle and cross-sectional area of the impeller flow path on hemo-compatibility was investigated in a monopivot centrifugal blood pump using computational fluid dynamics analysis. Blood damage index and stagnant surface area around the pivot were compared among impeller models with different outlet angle and flow path number or cross-sectional area under the extracorporeal circulation condition. As a result, smaller outlet angle caused lower blood damage index in the pump because high shear region around the flow path outlet dissolved. But it decreased washout flow rate which increased stagnant surface area around the pivot that will deteriorate pump anti-thrombogenicity. Larger flow path number or cross-sectional area also caused lower blood damage index because high shear region around the flow path outlet dissolved. Meanwhile, it increased the washout flow rate which decreased stagnant surface area around the pivot that will improve pump anti-thrombogenicity.
