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    题名: Turbulence Characteristics Downstream of a New Trileaflet Mechanical Heart Valve
    作者: Li, Chi-Pei;Chen, Sheng-Fu;Lo, Chi-Wen;Lu, Po-Chien
    贡献者: 淡江大學水資源及環境工程學系
    日期: 2011-05
    上传时间: 2011-09-30 21:30:29 (UTC+8)
    出版者: Philadelphia: Lippincott Williams & Wilkins
    摘要: Design limitations of current mechanical heart valves cause blood flow to separate at the leaflet edges and annular valve base, forming downstream vortex mixing and high turbulent shear stresses. The closing behavior of a bileaflet valve is associated with reverse flow and may lead to cavitation phenomenon. The new trileaflet (TRI) design opens similar to a physiologic valve with central flow and closes primarily due to the vortices in the aortic sinus. In this study, we measured the St. Jude Medical 27 mm and the TRI 27 mm valves in the aortic position of a pulsatile circulatory mock loop under physiologic conditions with digital particle image velocimetry (DPIV). Our results showed the major principal Reynolds shear stresses were <100 N/m2 for both valves, and turbulent viscous shear stresses were smaller than 15 N/m2. The TRI valve closed more slowly than the St. Jude Medical valve. As the magnitudes of the shear stresses were similar, the closing velocity of the valves should be considered as an important factor and might reduce the risks of thrombosis and thromboembolism.
    關聯: ASAIO Journal 57(3), pp.188-196
    DOI: 10.1097/MAT.0b013e318213f9c2
    显示于类别:[水資源及環境工程學系暨研究所] 期刊論文

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