教師資料查詢 | 類別: 期刊論文 | 教師: 盧博堅 LU PO-CHIEN (瀏覽個人網頁)

標題:Squeeze flow measurements in mechanical heart valves
學年96
學期2
出版(發表)日期2008/03/01
作品名稱Squeeze flow measurements in mechanical heart valves
作品名稱(其他語言)
著者Lo, Chi-wen; 盧博堅; Lu, Po-chien; Liu, Jia-shing; Li, Chi-pei; Hwang, Ned H.
單位淡江大學水資源與環境工程學系
出版者Philadelphia: Lippincott Williams & Wilkins
著錄名稱、卷期、頁數ASAIO Journal 54(2), pp.156-162
摘要High-speed squeeze flow during mechanical valve closure is often thought to cause cavitation, either between the leaflet tip and flat contact area in the valve housing, seating lip, or strut flat seat stop, depending on design. These sites have been difficult to measure within the housing, limiting earlier research to study of squeeze flow outside the housing or with computational fluid dynamics. We directly measured squeeze flow velocity with laser Doppler velocimetry at its site of occurrence within the St. Jude Medical (SJM), Omnicarbon (OC), and Medtronic Hall Standard (MHS) 29 mm valves in a mock circulation loop. Quartz glass provided an observation window to facilitate laser penetration. Our results showed increasing squeeze flow velocity at higher heart rates: 2.39-3.44 m/s for SJM, 3.07-4.33 m/s for OC, and 3.87-5.33 m/s for MHS. Strobe lighting technique captured the images of cavitation formation. Because these results were obtained in a mock circulation loop, one can assume this may occur in vivo resulting in valve damage, hemolysis, and thromboembolism. However, velocities of this magnitude alone cannot produce the pressure drop required for cavitation, and the applicability of the Bernoulli equation under these circumstances requires further investigation.
關鍵字
語言英文
ISSN1058-2916
期刊性質國外
收錄於SCI
產學合作
通訊作者
審稿制度
國別美國
公開徵稿
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