Method and apparatus for electrode and transthoracic impedance e

Details Method and apparatus for electrode and transthoracic impedance e Method and apparatus for electrode and transthoracic impedance e

1996-04-16

2000-01-18

Jaworski, Francis

Surgery

Diagnostic testing

Measuring electrical impedance or conductance of body portion

607 8, 324607, A61N 139, A61B 504

Patent

active

06016445&

ABSTRACT:
Impedance across a load, such as a pair of face-to-face electrodes, or across electrodes in contact with a patient's chest cavity, respectively, is modeled as a resistor in series with a capacitor, wherein the reactance component of the impedance equals 2.pi.*frequency/capacitance. A reference square wave voltage is applied to the load in series with a selected load resistor, and a response voltage is measured across the load. Both the reference voltage and the response voltage are then used to estimate a transfer function between them. Equating this transfer function to a resistor-capacitor circuit model results in estimation of the actual resistance and capacitance components of the true impedance.

REFERENCES:
patent: 4328808 (1982-05-01), Charbonnier et al.
patent: 5201865 (1993-04-01), Kuehn
patent: 5215081 (1993-06-01), Ostroff
patent: 5443073 (1995-08-01), Wang et al.
patent: 5465287 (1995-11-01), Egozi
patent: 5540724 (1996-07-01), Cox
patent: 5558671 (1996-09-01), Yates
patent: 5607455 (1997-03-01), Armstrong

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