An In Vivo Method for Measuring Turbulence in Mechanical Prosthesis Leakage JetsSource: Journal of Biomechanical Engineering:;2004:;volume( 126 ):;issue: 001::page 26Author:Brandon R. Travis
,
Thomas D. Christensen
,
M.D.
,
Hans Nygaard
,
M.S.
,
D.M.Sc.
,
Morten Smerup
,
M.D.
,
Morten S. Olsen
,
M.S.
,
J. Michael Hasenkam
,
M.D.
,
D.M.Sc.
DOI: 10.1115/1.1644563Publisher: The American Society of Mechanical Engineers (ASME)
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.
keyword(s): Turbulence , Stress , Jets , Velocity measurement , Leakage , Valves , Measurement , Shear (Mechanics) , Ultrasound AND Prostheses ,
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| contributor author | Brandon R. Travis | |
| contributor author | Thomas D. Christensen | |
| contributor author | M.D. | |
| contributor author | Hans Nygaard | |
| contributor author | M.S. | |
| contributor author | D.M.Sc. | |
| contributor author | Morten Smerup | |
| contributor author | M.D. | |
| contributor author | Morten S. Olsen | |
| contributor author | M.S. | |
| contributor author | J. Michael Hasenkam | |
| contributor author | M.D. | |
| contributor author | D.M.Sc. | |
| date accessioned | 2017-05-09T00:12:21Z | |
| date available | 2017-05-09T00:12:21Z | |
| date copyright | February, 2004 | |
| date issued | 2004 | |
| identifier issn | 0148-0731 | |
| identifier other | JBENDY-26353#26_1.pdf | |
| identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/129646 | |
| description 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 | The American Society of Mechanical Engineers (ASME) | |
| title | An In Vivo Method for Measuring Turbulence in Mechanical Prosthesis Leakage Jets | |
| type | Journal Paper | |
| journal volume | 126 | |
| journal issue | 1 | |
| journal title | Journal of Biomechanical Engineering | |
| identifier doi | 10.1115/1.1644563 | |
| journal fristpage | 26 | |
| journal lastpage | 35 | |
| identifier eissn | 1528-8951 | |
| keywords | Turbulence | |
| keywords | Stress | |
| keywords | Jets | |
| keywords | Velocity measurement | |
| keywords | Leakage | |
| keywords | Valves | |
| keywords | Measurement | |
| keywords | Shear (Mechanics) | |
| keywords | Ultrasound AND Prostheses | |
| tree | Journal of Biomechanical Engineering:;2004:;volume( 126 ):;issue: 001 | |
| contenttype | Fulltext |