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首页> 外文期刊>Artificial Organs >Hydrodynamic characteristics of bileaflet mechanical heart valves in an artificial heart: cavitation and closing velocity.
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Hydrodynamic characteristics of bileaflet mechanical heart valves in an artificial heart: cavitation and closing velocity.

机译：人造心脏中双叶机械心脏瓣膜的流体动力学特性：空化和闭合速度。

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摘要

The aim of this study was to investigate the possibility of using the bileaflet valves in an electrohydraulic total artificial heart (EHTAH). Three kinds of bileaflet valves, namely the ATS valve (ATS Medical Inc., Minneapolis, MN, USA), the St. Jude valve (St. Jude Medical Inc., St. Paul, MN, USA), and the Sorin Bicarbon valve (Sorin Biomedica, Vercelli, Italy), were mounted in the mitral position on an inclined 45 degrees plane in an EHTAH. The pressure waves near the valve surface, the valve-closing velocity, and a high-speed camera were employed to investigate the mechanism for bileaflet valve cavitation. The cavitation bubbles in the bileaflet valves were concentrated along the leaflet tip. The cavitation intensity increased with an increase in the valve-closing velocity. It was established that squeeze flow holds the key to bileaflet valve cavitation. At lower heart rates, the delay time of the asynchronous closure motion between the two leaflets of the Sorin Bicarbon valve was greater than that of the other bileaflet valves. At higher heart rates, no significant difference was observed among the bileaflet valves.
机译：这项研究的目的是研究在电液全人工心脏（EHTAH）中使用双叶瓣膜的可能性。三种双叶瓣，即ATS瓣膜（ATS Medical Inc.，美国明尼苏达州明尼阿波利斯），St。Jude瓣膜（St. Jude Medical Inc.，美国明尼苏达州圣保罗）和Sorin Bicarbon瓣膜（Sorin Biomedica，Vercelli，意大利）安装在EHTAH上的二尖角位置，倾斜45度。瓣膜表面附近的压力波，瓣膜的关闭速度和高速照相机被用来研究双叶瓣膜气蚀的机理。双叶瓣中的空化气泡沿小叶尖端集中。空化强度随阀门关闭速度的增加而增加。已经确定，挤压流动是双叶瓣气穴形成的关键。在较低的心率下，Sorin Bicarbon瓣膜的两个小叶之间的异步关闭运动的延迟时间大于其他双瓣叶瓣膜的延迟时间。在较高的心率下，双叶瓣间无明显差异。

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