Biological information measuring system
First Claim
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1. An apparatus for measuring electrical characteristics of a body, the apparatus comprising:
- a first electrode adapted to be positioned on the body;
a second electrode adapted to be positioned on the body and spaced from said first electrode;
voltage pulse means for applying a substantially rectangular voltage pulse across said first and second electrodes;
waveform recording means for recording a current I(t) flowing through said first and second electrodes during said voltage pulse as a current waveform;
waveform analyzing means for analyzing said current waveform to determine parameters Ii0, τ
i, and IDC, which relates to said current waveform by the formula ##EQU11## where, n=a positive integer greater than one,Ii0 =a plurality of waveform parameters,t=time,τ
=a plurality of time constants,IDC =a DC component of said waveform,said parameters Ii0, τ
i, and IDC representing the electrical characteristics of the body.
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Abstract
The biological information measuring system of this invention applies rectangular voltage pulses across at least a pair of electrodes attached to the surface of a living body, obtains, through the analysis of a transient current flowing across electrodes, current waveform parameters representing an equation approximating the waveform of the transient current, and calculates equivalent circuit parameters representing an electrical equivalent circuit across the electrodes. Using at least one type of these parameters as biological information, abnormality of the living body is detected.
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Citations
18 Claims
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1. An apparatus for measuring electrical characteristics of a body, the apparatus comprising:
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a first electrode adapted to be positioned on the body; a second electrode adapted to be positioned on the body and spaced from said first electrode; voltage pulse means for applying a substantially rectangular voltage pulse across said first and second electrodes; waveform recording means for recording a current I(t) flowing through said first and second electrodes during said voltage pulse as a current waveform; waveform analyzing means for analyzing said current waveform to determine parameters Ii0, τ
i, and IDC, which relates to said current waveform by the formula ##EQU11## where, n=a positive integer greater than one,Ii0 =a plurality of waveform parameters, t=time, τ
=a plurality of time constants,IDC =a DC component of said waveform, said parameters Ii0, τ
i, and IDC representing the electrical characteristics of the body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for measuring electrical characteristics of a body, the method comprising the steps of:
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placing a first electrode on the body; placing a second electrode on the body and spaced from said first electrode; applying a voltage pulse across said first and second electrodes; recording a current flowing through said first and second electrodes during said voltage pulse as a current waveform; analyzing said current waveform to represent said current waveform by the formula ##EQU15## where, n=a positive integer greater than one, Ii0 =a plurality of waveform parameters, t=time, τ
=a plurality of time constants,IDC =a DC component of said waveform, in order to determine parameters Ii0, τ
i, and IDC which represent the electrical characteristics of the body. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification