Computational Characterization of Flow and Hemolytic Performance of the UltraMag Blood Pump for Circulatory Support
- 14 December 2010
- journal article
- Published by Wiley in Artificial Organs
- Vol. 34 (12), 1099-1113
- https://doi.org/10.1111/j.1525-1594.2010.01017.x
Abstract
The Levitronix UltraMag blood pump is a next generation, magnetically suspended centrifugal pump and is designed to provide circulatory support for pediatric and adult patients. The aim of this study is to investigate the hemodynamic and hemolytic characteristics of this pump using the computational fluid dynamics (CFD) approach. The computational domain for CFD analysis was constructed from the three-dimensional geometry (3D) of the UltraMag blood pump and meshed into 3D tetrahedral/hybrid elements. The governing equations of fluid flow were computationally solved to obtain a blood flow through the blood pump. Further, hemolytic blood damage was calculated by solving a scalar transport equation where the scalar variable and the source term were obtained utilizing an empirical power-law correlation between the fluid dynamic variables and hemolysis. To obtain mesh independent flow solution, a comparative examination of vector fields, hydrodynamic performance, and hemolysis predictions were carried out. Different sizes of tetrahedral and tetrahedral/hexahedral mixed hybrid models were considered. The mesh independent solutions were obtained by a hybrid model. Laminar and SST κ–ω turbulence flow models were used for different operating conditions. In order to pinpoint the most significant hemolytic region, the flow field analysis was coupled to the hemolysis predictions. In summary, computational characterization of the device was satisfactorily carried out within the targeted operating conditions of the device, and it was observed that the UltraMag blood pump can be safely operated for its intended use to create a circulatory support for both pediatric and adult-sized patientsKeywords
This publication has 27 references indexed in Scilit:
- Preclinical Testing of the Levitronix Ultramag Pediatric Cardiac Assist Device in a Lamb ModelASAIO Journal, 2007
- Optimization of a Miniature Maglev Ventricular Assist Device for Pediatric Circulatory SupportASAIO Journal, 2007
- A Validated Computational Fluid Dynamics Model to Estimate Hemolysis in a Rotary Blood PumpArtificial Organs, 2005
- Quantitative Evaluation of Blood Damage in a Centrifugal VAD by Computational Fluid DynamicsJournal of Fluids Engineering, 2004
- A method of isolating surface tension and yield stress effects in a U-shaped scanning capillary-tube viscometer using a Casson modelJournal of Non-Newtonian Fluid Mechanics, 2002
- A Computational and Experimental Comparison of Two Outlet Stators for the Nimbus LVADASAIO Journal, 1999
- Red Cell Injury Assessed in a Numeric Model of a Peripheral Dialysis NeedleASAIO Journal, 1996
- Two-equation eddy-viscosity turbulence models for engineering applicationsAIAA Journal, 1994
- Mechanical Blood Traumatization by Tubing and Throttles in In Vitro Pump Tests: Experimental Results and Implications for Hemolysis TheoryArtificial Organs, 1993
- Rotor–Stator Interaction in a Diffuser PumpJournal of Turbomachinery, 1989