生物瓣膜假体的流体动力学性能

2018/12/14   下载量： 3 次

方案摘要

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应用领域 医疗/卫生
检测样本 其他
检测项目
参考标准 暂无

用400毫焦的PIV激光器作光源，用LaVision的ImagerHS型高速相机做成像器件，用LaVision的DaVis软件平台分析处理图像采集数据。对生物瓣膜假体的流体动力学性能进行了测试，分析。

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The aim of the present in vitro study was the evaluation of the fluid dynamical performance of the Carpentier-Edwards PERIMOUNT Magna Ease depending on the prosthetic size (21, 23, and 25 mm) and the cardiac output (3.6–6.4 L/min). A selfconstructed flow channel in combination with particle image velocimetry (PIV) enabled precise results with high reproducibility, focus on maximal and local peek velocities, strain, and velocity gradients. These flow parameters allow insights into the generation of forces that act on blood cells and the aorticwall.Theresults showed that the 21 and 23mmvalves have a quite similar performance. Maximal velocities were 3.03±0.1 and 2.87±0.13 m/s; maximal strain ???, 913.81±173.25 and 896.15±88.16 1/s; maximal velocity gradient ???, 1203.14 ± 221.84 1/s and 1200.81 ± 61.83 1/s. The 25mm size revealed significantly lower values: maximal velocity, 2.47 ± 0.15 m/s; maximal strain ???, 592.98 ± 155.80 1/s; maximal velocity gradient ???, 823.71 ± 38.64 1/s. In summary, the 25mm Magna Ease was able to create a wider, more homogenous flow with lower peak velocities especially for higher flow rates. Despite
the wider flow, the velocity values close to the aortic walls did not exceed the level of the smaller valves.

上一篇 在一个双稳湍流涡旋火焰中，对间歇性动态的时间-频率定位
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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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