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Computational Characterization of Flow and Hemolytic Performance of the UltraMag Blood Pump for Circulatory Support

机译:用于循环支持的UltraMag血泵的流量和溶血性能的计算表征

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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 patients. 
机译:Levitronix UltraMag血泵是下一代磁悬浮离心泵,旨在为小儿和成人患者提供循环支持。这项研究的目的是使用计算流体动力学(CFD)方法研究该泵的血液动力学和溶血特性。 CFD分析的计算域由UltraMag血泵的三维几何(3D)构成,并划分为3D四面体/混合元素。通过计算求解流体流动的控制方程,以获得通过血泵的血液流动。此外,通过求解标量输运方程来计算溶血性血液损害,其中利用流体动力学变量和溶血之间的经验幂律相关性获得标量变量和源项。为了获得独立于网格的流动解,对矢量场,流体动力性能和溶血预测进行了比较检查。考虑了不同尺寸的四面体和四面体/六面体混合混合模型。通过混合模型获得独立于网格的解。层流和SST κ–ω湍流模型用于不同的工况。为了查明最重要的溶血区域,将流场分析与溶血预测相结合。总而言之,在设备的目标操作条件下令人满意地进行了设备的计算表征,并且观察到,UltraMag血泵可以安全地按其预期用途运行,从而为儿科和成人大小的血液循环系统提供支持耐心。

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