國家衛生研究院 NHRI:Item 3990099045/5639
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    Please use this identifier to cite or link to this item: http://ir.nhri.org.tw/handle/3990099045/5639


    Title: Turbulence characteristics downstream of a new trileaflet mechanical heart valve
    Authors: Li, CP;Chen, SF;Lo, CW;Lu, PC
    Contributors: Division of Medical Engineering Research;National Institute of Cancer Research
    Abstract: 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/m for both valves, and turbulent viscous shear stresses were smaller than 15 N/m. 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.
    Date: 2011-05
    Relation: ASAIO Journal. 2011 May-Jun;57(3):188-196.
    Link to: http://dx.doi.org/10.1097/MAT.0b013e318213f9c2
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=1058-2916&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000290043500008
    Cited Times(Scopus): http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=79955590383
    Appears in Collections:[Others] Periodical Articles
    [Others] Periodical Articles

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