國家衛生研究院 NHRI:Item 3990099045/1477
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    題名: Mechanisms of mechanical heart valve cavitation: Investigation using a tilting disk valve model
    作者: He, ZM;Xi, BS;Zhu, KQ;Hwang, NHC
    貢獻者: Division of Medical Engineering Research
    摘要: Background and aim of the study: The induction of mechanical heart valve (MHV) cavitation was investigated using a 27 mm Medtronic Hall (MH27) tilting disk valve. Methods: The MH27 valve was mounted in the mitral position of a simulating pulse flow system, and stroboscopic lighting used to visualize cavitation bubbles on the occluder inflow surface at the instant of valve closure. MHV cavitation was monitored using a digital camera with 0.04 mm/pixel resolution sufficient to render the tiny bubbles clearly visible on the computer monitor screen. Results: Cavitation on MH27 valve was classified as five types according to the time, site and shape of the cavitation bubbles. Valve cavitation occurred at the instant of occluder impact with the valve seat at closing. The impact motion was subdivided into three temporal phases: W squeezing flow, (ii) elastic collision, and (iii) leaflet rebound. MHV cavitation caused by vortices was found to be initiated by the squeezing jet and/or by the transvalvular leakage jets. By using a tension wave which swept across the occluder surface immediately upon elastic impact, nuclei in the vortex core were expanded to form cavitation bubbles. Conclusion: Analysis of the shape and location of the cavitation bubbles permitted a better understanding of MHV cavitation mechanisms, based on the fluid dynamics of jet vortex and tension wave propagations.
    關鍵詞: Cardiac & Cardiovascular Systems
    日期: 2001-09
    關聯: Journal of Heart Valve Disease. 2001 Sep;10(5):666-674.
    Link to: http://www.icr-heart.com/journal/extconsept01/cavitation.htm
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000171300200017
    Cited Times(Scopus): http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0034793868
    顯示於類別:[黃煥常(2000-2008)] 期刊論文

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