Computational Fluid Dynamics Analysis of an Injection Suspension Blood Pump on the Hydraulic, Suspension and Hemolysis Property

doi:10.3901/JME.2018.20.052

Abstract

Abstract: Left ventricular assist devices (LVADs) have been developed to treat severe heart failure. Nowadays the third-generation LVADs apply either hydrodynamic or magnetic suspension method to avoid mechanical wearing. However, the magnetic suspension needs complex control system and extra energy consumption, which is not beneficial for long battery life. The hydrodynamic suspension occupies narrow gaps (usually less than 100 μm), where high shear stress and stagnant points would occur, which would cause blood damage. A blood pump using a novel injection suspension method to levitate the rotor is developed. The injection suspension method is passive and needs little extra energy consumption. The hydraulic, suspension and hemolysis property of the pump were investigated using CFD methods. Validation experiments are conducted. The hemolysis property of the novel pump and a reference pump without injection channels are compared. The results indicate that the injection suspension method could effectively levitate the rotor with a wider gap, and it has good hemocompatibility. The novel injection suspension method has important significance for the future LVAD development.

Key words: blood damage, computational fluid dynamics, injection suspension, left ventricular assist devices, rotary blood pumps

CLC Number:

TG156

WU Yue, ZHU Liangfan, LUO Yun. Computational Fluid Dynamics Analysis of an Injection Suspension Blood Pump on the Hydraulic, Suspension and Hemolysis Property[J]. Journal of Mechanical Engineering, 2018, 54(20): 52-58.

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