Method and apparatus for obtaining physical and/or chemical characteristics of a biological medium

摘要

A method of obtaining physical and/or chemical characteristics of a biological medium, comprising submitting said medium to at least two currents Ii of different strength and frequency fi, by means of a first group of electrodes, measuring the voltage drop Ui in said medium by means of a second group of electrodes, positioning a first element of the first group of electrodes and a second element of the second group of electrodes in a first zone of said medium, and positioning a third element of the first group of electrodes and a fourth element of the second group of electrodes in a second zone of said medium. Values of electrical impedance Zi are calculated at the, at least, two frequencies fi applied, and are adjusted to the curve: 1 $Z\left(f\right)=R_{\mathrm{infin}}+\frac{R_0-R_{\mathrm{infin}}}{1+{\left(jit\frac{f}{f_c}\right)}^{1-\mathrm{alpha}}}$ where R0 and Rinfin are the resistances exhibited by said medium in direct current and at very high frequency, respectively; fc is the frequency at which the maximum of the imaginary part is obtained; and alpha is a parameter connected with the type of tissue of the biological medium being measured.