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TECHNICAL PAPERS

An In Vivo Method for Measuring Turbulence in Mechanical Prosthesis Leakage Jets

[+] Author and Article Information
Brandon R. Travis

Thomas D. Christensen, Morten Smerup, Morten S. Olsen, J. Michael Hasenkam

Department of Cardiothoracic and Vascular Surgery, Århus University Hospital, Skejby Sygehus, Århus, Denmark Institute for Experimental Clinical Research, Århus University Hospital, Skejby Sygehus, Århus, Denmark

Hans Nygaard

Department of Cardiothoracic and Vascular Surgery, Århus University Hospital, Skejby Sygehus, Århus, Denmark The Engineering College of Århus, Århus, Denmark

J Biomech Eng 126(1), 26-35 (Mar 09, 2004) (10 pages) doi:10.1115/1.1644563 History: Received September 05, 2002; Revised October 01, 2003; Online March 09, 2004
Copyright © 2004 by ASME
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Figures

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A bileaflet mechanical prosthesis, emphasizing the pivot region.
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Traverse apparatus used to move ultrasound transducer. The mounting portion of the apparatus is sewn to the valve, allowing a precise positioning of an ultrasound transducer with respect to the valve.
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Interrogation area of study with respect to the valve and ultrasound transducer. The Cartesian axes used in this study are defined here.
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Velocity profiles obtained from (a) mean velocity measurements and (b) maximum velocity measurements during the axisymmetric, laminar free jet experiment
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Flow chart demonstrating data analysis method
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Leakage jet locations within interrogation area, and with respect to the valve. Turbulent normal stresses during leakage flow, calculated from maximum velocity measurements, cyclic averaging, and 20 ms phase windows, are defined for each jet found. Dots on the 2-D plot above the valve show location within the interrogation area at which data were acquired.
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Power spectrum of the measurements obtained from a specific location in jet 1
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Phase delay introduced by high pass filtering. (a) and (b) were created from data which were cyclic averaged, while (c) and (d) were created from data which were high pass filtered. The phase windows over which analyses were completed are shown in the left ventricular pressure curves above (a) and (b).
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Left atrial pressure, left ventricular pressure, and velocity over systole. The rise in left atrial pressure corresponds with a decrease in velocity.

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