Abstract
The paper presents the results of investigations concerning the
noninvasive method of estimating the actual volume of the blood chamber of
the POLVAD-EXT type ventricular assist device (VAD) during its operation.
The proposed method is based on the principle of Helmholtz's acoustic
resonance. Both the theory, main stages of the development of the
measurement method as well as the practical implementation of the proposed
method in the physical model of the POLVAD-EXT device are dealt with. The
paper contains the results of static measurements by means of the proposed
method (conducted at the Department of Optoelectronics, Silesian
University of Technology) as well as the dynamic measurements taken at the
Foundation of Cardiac Surgery Development (Zabrze, Poland) with the
professional model of the human cardiovascular system. The results of
these measurements prove that the proposed method allows to estimate the
actual blood chamber volume with uncertainties below 10%.
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