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首页> 外文会议>IFToMM World Congress >High speed video study of the valve leaflet motion of the ePTFE valve conduit: influence of the bulging sinus size of the valve conduit on the valve opening area and flow field
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High speed video study of the valve leaflet motion of the ePTFE valve conduit: influence of the bulging sinus size of the valve conduit on the valve opening area and flow field

机译：EPTFE阀导管的阀门宣传叶运动的高速视频研究：阀导管对阀门开口区域和流场的影响

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摘要

Good clinical records seem to show expanded polytetrafluoroethylene (ePTFE) valve conduits may be a good choice for treating right ventricular outflow tract (RVOT) reconstruction in congenital heart defects. Bulging sinus of the ePTFE valve seem to have favorable effect on hemodynamic performance, however, fluid mechanical research proving this effect has been limited. This research aims to study the effect of the bulging sinus size of the ePTFE valve on the valve opening area and flow phenomenon inside the conduit. Several valve conduit models with different bulging sinus sizes were used. Straight model, 50% reduced model, 25% reduced model, normal model, and 50% enlarged model were prepared. Effect of the bulging sinus size on a flow field inside the valve conduit was analyzed using Dynamic PIV system running at 1900 frames/s and valve opening areas were directly recorded using high speed digital camera running at 300 frames/s. Comparison of flow field results showed that the flow field of valve conduits with normal and 50% enlarged model generated strong vortex immediately behind the leaflet edge. Valve opened and closed early with normal and 50% enlarged model compared to 50% reduced model. Direct observation of the opening area of the valve showed that wider opening area was observed with normal and 50% enlarged model. Relative location of vortex seems to play important roll on valve open and close mechanism.
机译：良好的临床记录似乎显示出扩展的聚四氟乙烯（EPTFE）阀导管可能是治疗先天性心脏缺陷中的右心室流出道（RVOT）重建的良好选择。 EPTFE阀的凸出窦似乎对血流动力学性能有利影响，但是，证明这种效果的流体机械研究受到限制。本研究旨在研究EPTFE阀的凸出窦尺寸对导管内阀开口区域和流动现象的影响。使用具有不同凸出窦尺寸的几种阀门导管模型。直模，模型减少50％，模型减少25％，正常模型和50％放大模型。使用在1900帧/秒钟的动态PIV系统中分析了凸出窦尺寸对阀导管内的流场的影响，并使用300帧/秒运行的高速数码相机直接记录阀门开启区域。流场结果的比较表明，具有正常和50％的阀导管的流动场，扩大模型产生强大的涡旋，立即在传单边缘后面。阀门打开并提前关闭正常，50％的放大模型相比，模型减少了50％。直接观察瓣膜的开口面积显示，观察到更广泛的开口面积与正常和50％的放大模型。涡旋的相对位置似乎在阀门打开和关闭机制上起重要卷。

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