Influence of Impeller Speed Patterns on Hemodynamic Characteristics and Hemolysis of the Blood Pump

A continuous-flow output mode of a rotary blood pump reduces the fluctuation range of arterial blood pressure and easily causes complications. For a centrifugal rotary blood pump, sinusoidal and pulsatile speed patterns are designed using the impeller speed modulation. This study aimed to analyze th...

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Bibliographic Details
Published in:Applied sciences 2019-11, Vol.9 (21), p.4689
Main Authors: Wang, Yiwen, Shen, Peng, Zheng, Minli, Fu, Pengqiang, Liu, Lijia, Wang, Jingyue, Yuan, Lishan
Format: Article
Language:English
Subjects:
Blood pressure
blood pump
Blood pumps
Cardiovascular system
Centrifugal pumps
Complications
Computational fluid dynamics
Computer applications
Congestive heart failure
Continuous flow
Fluid dynamics
fluid simulation
Grooves
Heart failure
hemodynamic characteristics
Hemodynamics
Hemolysis
Hydrodynamics
Impellers
Optimization
Physiology
pulsation
Shear strain
Shear stress
Simulation
Sine waves
speed patterns
Thrombosis
Turbulence models
Unsteady flow
Velocity
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Summary:A continuous-flow output mode of a rotary blood pump reduces the fluctuation range of arterial blood pressure and easily causes complications. For a centrifugal rotary blood pump, sinusoidal and pulsatile speed patterns are designed using the impeller speed modulation. This study aimed to analyze the hemodynamic characteristics and hemolysis of different speed patterns of a blood pump in patients with heart failure using computational fluid dynamics (CFD) and the lumped parameter model (LPM). The results showed that the impeller with three speed patterns (including the constant speed pattern) met the normal blood demand of the human body. The pulsating flow generated by the impeller speed modulation effectively increased the maximum pulse pressure (PP) to 12.7 mm Hg, but the hemolysis index (HI) in the sinusoidal and pulsatile speed patterns was higher than that in the constant speed pattern, which was about 2.1 × 10−5. The flow path of the pulsating flow field in the spiral groove of the hydrodynamic suspension bearing was uniform, but the alternating high shear stress (0~157 Pa) was caused by the impeller speed modulation, causing blood damage. Therefore, the rational modulation of the impeller speed and the structural optimization of a blood pump are important for improving hydrodynamic characteristics and hemolysis.
ISSN:2076-3417
2076-3417
DOI:10.3390/app9214689