Document Detail

Turbulence Characteristics Downstream of a New Trileaflet Mechanical Heart Valve.
MedLine Citation:
PMID:  21499078     Owner:  NLM     Status:  Publisher    
Design limitations of current mechanical heart valves cause blood flow to separate at the leaflet edges and annular valve base, forming downstream vortex mixing and high turbulent shear stresses. The closing behavior of a bileaflet valve is associated with reverse flow and may lead to cavitation phenomenon. The new trileaflet (TRI) design opens similar to a physiologic valve with central flow and closes primarily due to the vortices in the aortic sinus. In this study, we measured the St. Jude Medical 27 mm and the TRI 27 mm valves in the aortic position of a pulsatile circulatory mock loop under physiologic conditions with digital particle image velocimetry (DPIV). Our results showed the major principal Reynolds shear stresses were <100 N/m for both valves, and turbulent viscous shear stresses were smaller than 15 N/m. The TRI valve closed more slowly than the St. Jude Medical valve. As the magnitudes of the shear stresses were similar, the closing velocity of the valves should be considered as an important factor and might reduce the risks of thrombosis and thromboembolism.
Chi-Pei Li; Sheng-Fu Chen; Chi-Wen Lo; Po-Chien Lu
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-4-14
Journal Detail:
Title:  ASAIO journal (American Society for Artificial Internal Organs : 1992)     Volume:  -     ISSN:  1538-943X     ISO Abbreviation:  -     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-4-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9204109     Medline TA:  ASAIO J     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
From the *Department of Water Resources and Environmental Engineering, Tamkang University, Taipei; †Division of Medical Engineering, National Health Research Institutes, Miaoli; and ‡National Institute of Cancer Research, National Health Research Institutes, Tainan, Taiwan.
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