气动心室辅助装置停滞的测定方法

2019/08/14   下载量： 0 次

方案摘要

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应用领域 医疗/卫生
检测样本 内脏器官
检测项目
参考标准 暂无

采用LaVision的FlowMaster粒子成像测速系统，Religa Heart PED 45 VAD 模型进行了流体速度矢量场的测量。采用DaVis8.2软件平台进行数据处理分析。研究分析了气动心室辅助装置停滞的测定方法

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Background: A pneumatic paediatric ventricular assist device developed at the Foundation of Cardiac Surgery Development, Zabrze, equipped with valves based on J. Moll’s design, with later modifications introduced at the Institute of Turbomachinery, Lodz University of Technology, was tested numerically and experimentally. The main aim of those investigations was to detect stagnation zones within the ventricular assist device and indicate advantages and limitations of both approaches.
Methods: In the numerical transient test, a motion of the diaphragm and discs was simulated. Two different methods were used to illustrate stagnation zones in the ventricular assist device. The flow pattern inside the chamber was represented by velocity contours and vectors to validate the results using images obtained in the laser particle image velocimetry experiment.
Results: The experimental light-based method implied problems with proper illumination of regions in the wall vicinity. High-resolution flow data and other important parameters as stagnation regions or flow patterns in regions not accessible for light in the particle image velocimetry method are derived in the numerical solution. However, computations of a
single case are much more time-consuming if compared to a single experiment conducted on a well-calibrated stand.
Conclusion: The resulting main vortexes in the central part of the pump chamber and the velocity magnitudes are correlated in both methods, which are complementary and when used together offer better insight into the flow structure inside the ventricular assist device and enable a deeper analysis of the results.

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北京欧兰科技发展有限公司
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