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Impact of Impeller Blade Number on the Hemodynamic Performance of Specially Designed Mini VAD

Authors :

Nasser Alizadeh¹ Hanieh Niroomand-Oscuii² Farzan Ghalichi³

1- دانشگاه صنعتی تبریز(سهند) 2- دانشگاه صنعتی تبریز(سهند) 3- دانشگاه صنعتی تبریز(سهند)

Keywords :

Ventricular Assist Device،Centrifugal Pump،Hemolysis،Computational fluid dynamics،Impeller design

Abstract :

In recent years, the growing prevalence of cardiovascular diseases has highlighted the demand for advanced mechanical circulatory support devices. Ventricular assist devices (VADs) are among the most effective approaches, as they must provide physiologically adequate flow and pressure while minimizing hemolysis and other blood-related complications. The design challenges include device miniaturization, reduced blood residence time, and minimization of shear-induced blood damage. In this study, we present the design and computational analysis of a centrifugal ventricular assist pump with a novel impeller geometry. The impeller, modeled in CATIA based on centrifugal pump theory, has a diameter of 45 mm, which is approximately 14% smaller than comparable designs reported in previous studies. This reduction in size enables integration into applications with strict spatial constraints, such as implantable VADs. Computational fluid dynamics (CFD) simulations were performed at a rotational speed of 2500 rpm and a target flow rate of 5 L/min to assess hydraulic performance and hemocompatibility. Results demonstrate that the proposed design achieves the physiological requirements for pressure head and flow while maintaining hemolysis within acceptable limits. Furthermore, impellers with fewer blades (4 and 5 blades) exhibited lower shear stress and reduced hemolysis, suggesting improved hemodynamic efficiency and safer blood handling characteristics.