The operating pressures in the right heart are significantly lower than those of the left heart and with marked differences in the circulation impedances. The pulmonary circulation shows a tolerance for mild regurgitation and pressure gradient . Pulmonary regurgitation fractions on the order of 20% and transvalvular pressure gradients of less than 25mm Hg are considered mild . Given this tolerance, we examine the concept of using a motionless valve to regulate flow in the pulmonary position. In a previous study, the use of fluid diodes was shown to be a promising concept for use as a pulmonary valve . In this study, we test two different diode designs. For each diode valve, flow performance was documented as a function of pulmonary vascular resistance (PVR) and compliance. Tests were done using a pulmonary mock circulatory system  over the normal adult range of PVR and compliance settings.
In Vitro Study of Flow Regulation for Pulmonary Insufficiency Using Diode Valves
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Camp, TA, Hequembourg, S, Figliola, RS, & McQuinn, T. "In Vitro Study of Flow Regulation for Pulmonary Insufficiency Using Diode Valves." Proceedings of the ASME 2007 Summer Bioengineering Conference. ASME 2007 Summer Bioengineering Conference. Keystone, Colorado, USA. June 20–24, 2007. pp. 763-764. ASME. https://doi.org/10.1115/SBC2007-176723
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