Computational Fluid Dynamics Design and Analysis of a Passively Suspended Tesla Pump Left Ventricular Assist Device

Abstract

This paper summarizes the use of computational fluid dynamics (CFD) to design a novelly suspended Tesla LVAD. 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 liter-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 mmHg 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.

Experimental evaluation of mechanical heart support system based on viscous friction disc pump

“…Габариты насоса задавались, исходя из медикобиологиче ских требований для систем МПС и с учетом экспе риментальных исследований наших коллег из Пен сильвании [18,19].…”

“…Группа авторов из Пенсильванского универси тета создала экспериментальную модель дисково го насоса трения для перекачивания крови [18,19]. В экспериментальных исследованиях in vitro и in vivo было показано, что подобные модели способ ны развивать производительность до 10 л/мин, в зависимости от диаметра дисков обеспечивать пе рекачивание этого объема крови при скорости вра щения ротора от 4000 до 8000 об/мин.…”

Prospects of Disk Pump for Mechanical Circulatory Support in Cardiac Surgery (Review)

“…Для оптимизации характеристик насоса, при его проектировании использовался код Computational fl uid dynamics (CFD). Описанию дан-ной методики и результатам расчета была посвяще-на отдельная статья [1]. Для исследования гемолиза и тромбообразования были проведены эксперимен-ты in vitro (с бычьей кровью) и in vivo (теленок 100 кг, насос располагался снаружи).…”

A New Method for Assessing Haemolysis in a Rotary Blood Pump Using Large Eddy Simulations (LES)

“…Nonpulsatile rotary blood pumps have been modelled by e.g. Medvitz et al (2011), Mitamura et al (2011 and Wang et al (2008). CFD calculations refer to blood velocity distribution, mechanical stress distribution in different sites inside the artificial heart and heat exchange with external environment.…”