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
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
A bileaflet mechanical prosthesis, emphasizing the pivot region.
Grahic Jump Location
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.
Grahic Jump Location
Interrogation area of study with respect to the valve and ultrasound transducer. The Cartesian axes used in this study are defined here.
Grahic Jump Location
Velocity profiles obtained from (a) mean velocity measurements and (b) maximum velocity measurements during the axisymmetric, laminar free jet experiment
Grahic Jump Location
Flow chart demonstrating data analysis method
Grahic Jump Location
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.
Grahic Jump Location
Power spectrum of the measurements obtained from a specific location in jet 1
Grahic Jump Location
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).
Grahic Jump Location
Left atrial pressure, left ventricular pressure, and velocity over systole. The rise in left atrial pressure corresponds with a decrease in velocity.




Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In