Hydrodynamic Noise of Pulsating Jets through Bileaflet Mechanical Mitral Valve

Abstract

Experimental research results of hydrodynamic noise of pulsating flow through a bileaflet mechanical mitral valve are presented. The pulsating flow of pure water corresponds to the diastolic mode of the cardiac rhythm heart. The valve was located between the model of the left atrium and the model of the left ventricle of the heart. A coordinate device, on which a block of miniature sensors of absolute pressure and pressure fluctuations was installed, was located inside the model of the left ventricle. It is found that the hydrodynamic noise of the pulsating side jet of the semiclosed valve is higher than for the open valve. The pressure fluctuation levels gradually decrease with the removal from the mitral valve. It is established that at the second harmonic of the pulsating flow frequency, the spectral levels of the hydrodynamic noise of the semiclosed bileaflet mechanical mitral valve are almost 5 times higher than the open valve. With the removal from the mitral valve, spectral levels of hydrodynamic noise are decreased, especially strongly at the frequency of the pulsating water flow and its higher harmonics.

Validation of a Multiscale Computational Model Using a Mock Circulatory Loop to Simulate Cardiogenic Shock

“…We hypothesize that these oscillations may be because of the inertia of the mechanical valve leaflets and to perivalvular artificial flow patterns (e.g., fluid recirculation, vortexes, unsteady jet, and peripheral and hinge leakage jets). 34,35 Other factors contributing to the oscillations may be LV sac contractility, LV outflow tract, and aortic root designs and their compliance causing secondary pressure wave reflection. Similar oscillations have been observed in other MCL studies simulating healthy and failing heart hemodynamics.…”

Effect of sleeve orifices ratio on flow performance and hydrodynamic noise in the two-stage sleeve control valve

“…Zeng et al 8 investigated the effect of flow pattern on flow-induced vibration and noise in the control valve and that the change between annular flow and core flow will cause sound mutation. Voskoboinick et al 9 studied hydrodynamic noise of pulsating jets through the mechanical mitral valve; the hydrodynamic noise of the pulsating side jet of the semi-closed valve is almost 1.5 times higher compared with the open valve.…”