Surgery – Diagnostic testing – Measuring electrical impedance or conductance of body portion
Patent
1998-02-06
2000-09-26
Lateef, Marvin M.
Surgery
Diagnostic testing
Measuring electrical impedance or conductance of body portion
600484, A61B 505
Patent
active
061252972
ABSTRACT:
Method and apparatus are described for determining volumes of body fluids in a subject using bioelectrical response spectroscopy. The human body is represented using an electrical circuit. Intra-cellular water is represented by a resistor in series with a capacitor; extra-cellular water is represented by a resistor in series with two parallel inductors. The parallel inductors represent the resistance due to vascular fluids. An alternating, low amperage, multi-frequency signal is applied to determine a subject's impedance and resistance. From these data, statistical regression is used to determine a 1% impedance where the subject's impedance changes by no more than 1% over a 25 kHz interval. Circuit components of the human body circuit are determined based on the 1% impedance. Equations for calculating total body water, extra-cellular water, total blood volume, and plasma volume are developed based on the circuit components.
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Cate James M.
Lateef Marvin M.
Mantis Mercader Eleni
The United States of America as represented by the United States
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