Modeling of the bioelectrical impedance of blood by synthesis of the equivalent electrical circuits

Abstract

This paper introduces a new method of modeling bioelectrical impedance of blood allowing to get electrical equivalent circuit which may be used for estimation blood composition. This method is based on pulse testing of blood sample, defining the frequency characteristics of bioelectrical impedance, finding transfer function and representation of state-space model in the of electrical equivalents. Interpretation of parameters of model gives the information on structure of researched object. Linear dependence of parameters of the synthesized model on a level hematocrit blood sample is received. This method allows decreasing the time of hematocrit estimation. The process of estimation (i.e. affection on blood sample) is proceeding during the time of pulse action so this makes possible to estimate the hematocrit rapidly. © 2009 Springer-Verlag.