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AssigneeNte S.A.
InventorsJordi Elvira Canas, Pere Riu Costa, Xavier Rosell Ferrer, Ramon Bragos Bardia
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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 ( f ) = R ∞ + R 0 - R ∞ 1 + ( j f f c ) 1 - α where R0 and R∞ 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 α is a parameter connected with the type of tissue of the biological medium being measured.
A method of obtaining physical and/or chemical characteristics of a biological medium (10), comprising submitting said biological medium (10) to at least two currents (Ii) of different strength and frequency (fi), via a first group of electrodes, measuring the voltage drop (Ui) in said biological medium (10) via a second group of electrodes, locating a first element (20) of said first group of electrodes and a second element (30) of said second group of electrodes in a first zone of said biological medium (10), and locating a third element (20′) of said first group of electrodes and a fourth element (30′) of said second group of electrodes in a second zone of said biological medium (10), calculating values of electrical impedance (Zi) at the at least two frequencies (fi) applied, wherein the calculated values of electrical impedance (Zi) are adjusted to the following curve:
Apparatus (1, 1′) for obtaining physical and/or chemical characteristics of a biological medium (10), that comprises a microprocessor (200), a keyboard (201), a screen (202), means of supplying said microprocessor, a first group of electrodes for injection of current consisting of at least one first and one third element (20, 20′) and a second group of electrodes for measuring the voltage drop, consisting of at least one second and one fourth element (30, 30′), a differential amplifier (208), a demodulator (209) and a calibration network (212), wherein said apparatus (1, 1′) includes at least two filters, which give rise to at least two signals of different frequency that are injected alternately by means of a multiplexer (206) at the first group of electrodes (20, 20′).
Dependencies are inferred from the claim text.