Reynolds shear stress behind disk and 3-leaflet valve prostheses

Pulsatile flow behind Hancock porcine xenograft valve (HX), conduit-type polyurethane 3-leaflet valve (PUC) and Björk-Shiley cc disk valve (BS) were analyzed in vitro by a laser-Doppler anemometer. Central flow was observed in HX and PUC valves only for a short period in a cardiac cycle. The maximum...

Full description

Saved in:
Bibliographic Details
Published inJinko Zoki Vol. 16; no. 1; pp. 350 - 353
Main Authors SEKI, J., NAKAMURA, T., UMEZU, M., HAYASHI, K.
Format Journal Article
LanguageJapanese
Published JAPANESE SOCIETY FOR ARTIFICIAL ORGANS 1987
Subjects
3-leaflet valve
Disk valve
Laser-Doppler anemometer
Reynolds shear stress
Turbulence intensity
Online AccessGet full text

Cover

More Information
Summary:Pulsatile flow behind Hancock porcine xenograft valve (HX), conduit-type polyurethane 3-leaflet valve (PUC) and Björk-Shiley cc disk valve (BS) were analyzed in vitro by a laser-Doppler anemometer. Central flow was observed in HX and PUC valves only for a short period in a cardiac cycle. The maximum Reynolds shear stress observed on tie cross-section at the distance of 2 diameters from the valve was about 500dyn/cm2 in all valves, which might affect the erythrocytes and platelets fluidmechanically. Wide distribution of high Reynolds shear stress and high turbulence intensity observed in HX and PUC valves suggest that 3-leaflet valves do not necessarily have better fluidmechanical characteristics compared with disk valves.
ISSN:0300-0818
1883-6097
DOI:10.11392/jsao1972.16.350