Bioelectrical impedance ECG measurement and defibrillator implementing same
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United States of America Patent
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Sep 23, 2003
Grant Date -
Feb 13, 2003
app pub date -
Jul 17, 2001
filing date -
Jul 17, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A multivariate impedance (Z) measurement module, for use in an electrotherapy device, that accurately measures patient impedance. The Z measurement module implements a resistive network model of the patient's body defined by one or more equations each including resistive elements that represent the impedance of a current paths through the patient. The Z measurement module utilizes at least three electrodes placed at predetermined relative locations on the patient's body, and measures the voltage across different electrode pairs while an applying an alternating current through certain electrodes. The applied current and measured voltages are used to solve the patient model equations for the individual resistive elements. Thus, each individual impedance component is separately and accurately determined.
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