Document Detail


Hydrodynamic characteristics of bileaflet mechanical heart valves in an artificial heart: cavitation and closing velocity.
MedLine Citation:
PMID:  17584477     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The aim of this study was to investigate the possibility of using the bileaflet valves in an electrohydraulic total artificial heart (EHTAH). Three kinds of bileaflet valves, namely the ATS valve (ATS Medical Inc., Minneapolis, MN, USA), the St. Jude valve (St. Jude Medical Inc., St. Paul, MN, USA), and the Sorin Bicarbon valve (Sorin Biomedica, Vercelli, Italy), were mounted in the mitral position on an inclined 45 degrees plane in an EHTAH. The pressure waves near the valve surface, the valve-closing velocity, and a high-speed camera were employed to investigate the mechanism for bileaflet valve cavitation. The cavitation bubbles in the bileaflet valves were concentrated along the leaflet tip. The cavitation intensity increased with an increase in the valve-closing velocity. It was established that squeeze flow holds the key to bileaflet valve cavitation. At lower heart rates, the delay time of the asynchronous closure motion between the two leaflets of the Sorin Bicarbon valve was greater than that of the other bileaflet valves. At higher heart rates, no significant difference was observed among the bileaflet valves.
Authors:
Hwansung Lee; Akihiko Homma; Yoshiyuki Taenaka
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Artificial organs     Volume:  31     ISSN:  0160-564X     ISO Abbreviation:  Artif Organs     Publication Date:  2007 Jul 
Date Detail:
Created Date:  2007-06-22     Completed Date:  2007-10-24     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7802778     Medline TA:  Artif Organs     Country:  United States    
Other Details:
Languages:  eng     Pagination:  532-7     Citation Subset:  IM    
Affiliation:
Department of Artificial Organs, The Advanced Medical Engineering Center, Research Institute, National Cardiovascular Center, Osaka, Japan. hslee@ri.ncvc.go.jp
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MeSH Terms
Descriptor/Qualifier:
Biomechanics
Equipment Failure Analysis
Heart Valve Prosthesis*
Heart, Artificial*
Hemorheology
Humans
Mitral Valve*
Prosthesis Design

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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