An In Vivo Method for Measuring Turbulence in Mechanical Prosthesis Leakage Jets-Reference-Cited by-同舟云学术

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

Published:2004-02-01 Issue:1 Volume:126 Page:26-35
ISSN:0148-0731
Container-title:Journal of Biomechanical Engineering
language:en
Short-container-title:

Author:

Travis Brandon R.,Christensen Thomas D.¹²,Smerup Morten¹²,Olsen Morten S.¹²,Hasenkam J. Michael¹²,Nygaard Hans¹³

Affiliation:

1. Department of Cardiothoracic and Vascular Surgery, A˚rhus University Hospital, Skejby Sygehus, A˚rhus, Denmark

2. Institute for Experimental Clinical Research, A˚rhus University Hospital, Skejby Sygehus, A˚rhus, Denmark

3. The Engineering College of A˚rhus, A˚rhus, Denmark

Abstract

This work introduces a method for the in vivo measurement and analysis of turbulence within the leakage of a mechanical heart valve. Several analysis techniques were applied to ultrasound measurements acquired within the atrium of a pig, and error associated with these techniques was analyzed. The technique chosen applies cyclic averaging to mean and maximum velocity measurements within small, normalized phase windows to calculate Reynolds normal stresses in the direction of the ultrasound beam. Maximum shear stresses are estimated from these normal stresses using an analytical technique. The stresses observed were smaller than those reported from previous in vitro simulations.

Publisher

ASME International

Subject

Physiology (medical),Biomedical Engineering

Link

http://asmedigitalcollection.asme.org/biomechanical/article-pdf/126/1/26/5767864/26_1.pdf

Reference29 articles.

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2. Yoganathan, A. P., personal communication.

3. Gross, J. M. et al., 1996, “A microstructural flow analysis within a bileaflet mechanical heart valve hinge,” J. Heart Valve Dis., 5(6), pp. 581–590.

4. Ellis, J. T. et al., 1996, “Velocity measurements and flow patterns within the hinge region of a Medtronic Parallel bileaflet mechanical valve with clear housing,” J. Heart Valve Dis., 5(6), pp. 591–599.

5. Woo, Y. R., and Yoganathan, A. P., 1986, “In vitro pulsatile flow velocity and shear stress measurements in the vicinity of mechanical mitral heart valve prostheses,” J. Biomech., 19(1), pp. 39–51.

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