Computational fluid dynamics design and analysis of a passively suspended Tesla pump left ventricular assist device.
Computational fluid dynamics design and analysis of a passively suspended Tesla pump left ventricular assist device.
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被动悬挂特斯拉泵左心室辅助装置的计算流体动力学设计与分析。
DOI：
10.1111/j.1525-1594.2010.01087.x
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发表时间：
2011
影响因子：
2.4
通讯作者：
Paterson,EricG
中科院分区：
文献类型：
--
作者：
Medvitz,RichardB;Boger,DavidA;Izraelev,Valentin;Rosenberg,Gerson;Paterson,EricG
本文综述了利用计算流体动力学（CFD）设计一种新型悬吊式特斯拉左心室辅助装置。分析了几种设计变量，研究了影响器件性能的参数。在泵转速为6500、6750和7000 rpm、流量为3 ~ 7升/分钟（LPM）的情况下，进行CFD测试。CFD计算结果表明，缩短离泵入口最近的板段减少了上板前缘下方形成的分离，并使通过转子间隙的流量分布更加均匀，这两者都对装置的水动力性能有积极影响。在6 LPM通流量和6750 rpm转速的设计条件下，最终设计的泵产生了77 mm Hg的水头上升，液压效率为16%。为了评估装置的血流动力学，我们对应变速率场进行了评估。泵壁剪切应力表明泵壁剪切应力可能足以抑制血栓沉积。最后，将集成的现场溶血模型应用于CFD结果，以评估设计变化和操作条件对装置溶血性能的影响。
This article summarizes the use of computational fluid dynamics (CFD) to design a novel suspended Tesla left ventricular assist device. Several design variants were analyzed to study the parameters affecting device performance. CFD was performed at pump speeds of 6500, 6750, and 7000 rpm and at flow rates varying from 3 to 7 liters per minute (LPM). The CFD showed that shortening the plates nearest the pump inlet reduced the separations formed beneath the upper plate leading edges and provided a more uniform flow distribution through the rotor gaps, both of which positively affected the device hydrodynamic performance. The final pump design was found to produce a head rise of 77 mm Hg with a hydraulic efficiency of 16% at the design conditions of 6 LPM throughflow and a 6750 rpm rotation rate. To assess the device hemodynamics the strain rate fields were evaluated. The wall shear stresses demonstrated that the pump wall shear stresses were likely adequate to inhibit thrombus deposition. Finally, an integrated field hemolysis model was applied to the CFD results to assess the effects of design variation and operating conditions on the device hemolytic performance.