Key result
Pulsed ultrasonic Doppler velocity measurements inside a left ventricular assist device revealed a maximum mean wall shear stress of 25 dynes/cm2 and a maximum Reynolds stress of 212 dynes/cm2.
Pulsed ultrasonic Doppler velocimetry demonstrates that shear and Reynolds stresses within the tested LVAD are below the threshold for blood component damage.
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Supports low hemolysis risk in tested LVAD; hypothesis-generating for human device safety pending clinical validation.
In this study we have employed a single channel, pulsed ultrasonic Doppler velocimeter to measure instantaneous velocity distributions within the pumping chamber of a ventricular assist device. Instantaneous velocities have been decomposed into periodic mean and turbulent fluctuating components from which estimates of Reynolds stresses within the chamber and mean shear stresses along the wall of the chamber have been obtained. A review of the complete data set indicates a maximum value of the mean wall shear stress of 25 dynes/cm2 and a maximum Reynolds stress of 212 dynes/cm2. These values are lower than those measured distal to aortic valve prostheses in vitro and are well below levels known to damage blood components. Core flow patterns, wall washing patterns and flow stagnation points are also revealed.
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Tarbell et al. (1986) studied Left Ventricular Assist Device. Pulsed ultrasonic Doppler velocimeter was evaluated on Mean wall shear stress and Reynolds stress. Pulsed ultrasonic Doppler velocity measurements inside a left ventricular assist device revealed a maximum mean wall shear stress of 25 dynes/cm2 and a maximum Reynolds stress of 212 dynes/cm2.
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