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A numerical investigation to evaluate the washout of blood compartments in a total artificial heart

机译:评价总人造心脏血液隔室冲洗的数值调查

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Total artificial heart (TAH) represents the only valid alternative to heart transplantation, whose number is continuously increasing in recent years. The TAH used in this work, is a biventricular pulsatile, electrically powered, hydraulically actuated flow pump with all components embodied in a single device. One of the major issues for TAHs is the washout capability of the device, strictly correlated with the presence of blood stagnation sites. The aim of this work was to develop a numerical methodology to study the washout coupled with the fluid dynamics evaluation of a total artificial heart under nominal working conditions. The first part of this study focussed on the CT scan analysis of the hybrid membrane kinematics during TAH operation, which was replicated with a fluid-structure interaction simulation in the second part. The difference in percentage between the in vitro and in silico flow rates and stroke volume is 9.7% and 6.3%, respectively. An injection of contrast blood was simulated, and a good washout performance was observed and quantified with the volume fraction of the contrast blood still in the ventricle. The left chamber of the device showed a superior washout performance, with a contrast volume still inside the device after four washout cycles of 6.2%, with the right chamber showing 15%.
机译:人工心脏(TAH)代表了心脏移植的唯一有效替代品,其数量近年来不断增加。在这项工作中使用的TAH是一种双挡板,电动液压致动流动泵,其具有单个装置中体现的所有组件。 TAHS的主要问题之一是该装置的冲洗能力,严格与血液停滞位点的存在相关。这项工作的目的是开发一个数值方法,以研究伴随在标称工作条件下的总人造心脏的流体动力学评价。本研究的第一部分侧重于TAH操作期间杂化膜运动学的CT扫描分析,其在第二部分中的流体结构相互作用模拟复制。体外和硅流速和中风体积之间的百分比分别为9.7%和6.3%。模拟了对比血液的注射,并且观察到良好的冲洗性能,并用仍在心室中的对比度血液的体积分数量化。该装置的左腔室显示出优异的冲洗性能,在4.2%的四个冲洗循环后仍然在装置内仍有造影作用,右腔显示为15%。

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