國家衛生研究院 NHRI:Item 3990099045/1477
English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 12145/12927 (94%)
造訪人次 : 856538      線上人數 : 686
RC Version 6.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜尋範圍 查詢小技巧：
  • 您可在西文檢索詞彙前後加上"雙引號"，以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋，建議至進階搜尋限定作者欄位，可獲得較完整資料
    •  進階搜尋
    主頁 ‧ 登入 ‧ 上傳 ‧ 說明 ‧ 關於NHRI ‧ 管理 到手機版


    請使用永久網址來引用或連結此文件: http://ir.nhri.org.tw/handle/3990099045/1477


    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

    文件中的檔案:

    檔案 描述 大小格式瀏覽次數
    ISI000171300200017.pdf3346KbAdobe PDF661檢視/開啟


    在NHRI中所有的資料項目都受到原著作權保護.

    TAIR相關文章

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回饋