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Time resolved PIV and LDA study of the turbulent flow field of bi-Ieaflet mechanical mitral prostheses

Akutsu T., Fukuda T., Sakurai S., Saito J.

Biocybernetics and Biomedical Engineering

2006

Vol. 26, no. 1

53-59

Time Resolved PIV and LDA measurment were conducted for the study of the fIow field generated by the mechanical bi-leafIet mitral valves, the SJM and the Jyros valves, to find out the effect of the valve designs and the installed orientations on the fIow. Results from the time resolved PIV system were very comparable to the LDA results. In both orientations, the JR valve generated much higher turbulent stresses.

In vitro evaluating system for prosthetic heart valves in a case of the Jyros valve

Fujimoto T., Tsutsumi Y., Shiraishi Y., Iwasaki K., Yoshida M., Umezu M., Begg J., Woodard J.

Biocybernetics and Biomedical Engineering

2002

Vol. 22, no. 4

41-46

The Jyros valve has unique hydrodynamic characteristics comparing with other types of valves. In this study, precise hydrodynamic characteristics of the valve were examined using a mock circulatory system, which we have developed. Further, the influence of leaflet rotation is shown to reduce flow resistance under the rotational flow condition which was produced by a spiral vortex pump. However, hemolysis was not revealed to be reduced by the Jyros.