Noise of Open and Semi-Closed Bileaflet Prosthetic Mitral Valve

Hydrodynamic Noise of Pulsating Jets through Bileaflet Mechanical Mitral Valve

“…During the pulsating flow of the semiclosed valve, the hydrodynamic noise of the side jet is higher than when the valve is open. This correlates with studies for a stationary water flow through the mitral valve [33,35,37]. The pressure fluctuation levels gradually are decreased when sensors are moved away from the mitral valve.…”

“…The first impulse is formed by the expansion of the left ventricle of the heart (wave E), and the second is formed by the contraction of the left atrium (wave A). Between these impulses, there is a diastase time interval during which the volume of the ventricle is constant [36,37]. The form of the curves of the pulsating water supply by the pump through the mitral valve in the form of water rate, which was recorded by an ultrasonic flowmeter, is shown in Figure 5 Figure 7.…”

Statistical Characteristics of Flow Field through Open and Semi-Closed Bileaflet Mechanical Heart Valve

“…Physical simulation of the flow and overlap of the leaflets of mechanical heart valves by thrombi was performed in the laboratory at the Technical University "Politecnico di Milano" (Italy). A bileaflet mechanical heart valve (Figure 1) from Sorin Biomedica Cardio (Italy) with a diameter of d = 25 mm was installed in the position of the mitral valve between the model of the left atrium and the model of the left ventricle [49,50]. The studies were performed for the continual and pulsating flow of pure water and an aqueous solution of glycerol through an open and semi-closed valve.…”

“…The electrical signals of the sensors were amplified, filtered and fed through a 16-channel analog-to-digital converter to a personal computer, where the appropriate programs and algorithms processed and analyzed the experimental dates using the apparatus of probability theory and mathematical statistics [52]. Simultaneous multipoint recording of pressures, noise and vibrations allowed investigating the space-time characteristics of hydroacoustic and vibration parameters, to identify sources of noise and vibration [48,49,53]. The measurement error of the integral values of the velocity and pressure fields, and also vibration did not exceed 10% (95% reliability).…”

“…Figure 2. Schematic diagram (a) and photo (b) of the experimental standTo conduct physical simulation of fluid flow through the bileaflet mechanical heart valve, an experimental stand was created[49][50][51], which is shown in Figure2. The mitral valve was located in the opening between the model of the left atrium (3) and the model of the left ventricle (4).…”