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    題名: Measurement of retrograde flow field of bileaflet artificial heart valves
    作者: Lu, Po-chien;Hsu, Jui-lien;Chu, Shu-hsun
    貢獻者: 淡江大學水資源及環境工程學系
    日期: 1999
    上傳時間: 2010-03-26 16:30:14 (UTC+8)
    出版者: Singapore: World Scientific Publishing Co. Pte. Ltd.
    摘要: This study focuses on a series of in-vitro tests on retrograde flow fields of four clinically-used artificial bileaflet aortle valves, St. Jude Medical (SJM), CarboMedics (CM), Edwards Tekna modified DuroMedics (DM), and Sorin Bicarbon (SB). The flow fields of the valves were measured with a laser Doppler anemometer (LDA) at the upstream area near the valves. The measurement points were concentrated at the locations where the greatest retrograde flow occurs when the leaflets close, which are the gaps in between the leaflets, in between the leaflets and housing ring, and at the hinges. The valves were placed inside a circulatory mock loop in which the heart rate was set at 70 beats per minute, the cardiac output was maintained at 5 liters per minute, and the aortic pressure wave forms were kept within the physiological range. The valves were compared according their mean velocities, Reynalds stresses, as well as their effects on retrograde flow fields and blood cell damage. The mean velocities of the retrograde flow fields of SJM, CM, DM, and SB valves all reach maximum values at the center of the gap between the closed leaflets during the early stages of diastole. SB has the greatest mean velocity and principal Reynolds shear stress values, followed by DM, SJM, and CM. The maximum Reynolds shear stress values of all four valves exceed the threshold of platelet damage, thus increasing the possibility of thrombosis.
    關聯: Biomedical engineering: applications basis communications 11(1), pp.11-18
    顯示於類別:[水資源及環境工程學系暨研究所] 期刊論文

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