Relative impedance measurement

Details Relative impedance measurement Relative impedance measurement

A - Human Necessities

61

B

A61B 5/053 (2006.01) A61B 5/0402 (2006.01) A61B 18/14 (2006.01) A61M 25/095 (2006.01)

Patent

CA 2551201

A method for calibrating impedance includes coupling at least first, second, and third electrodes at respective locations to a surface of a body of a subject. A first current passing through the body between the first and second body-surface electrodes is measured, and a second current passing through the body between the first and third body-surface electrodes is measured. From the first and second currents, a contact factor is derived that is indicative of the impedance between at least one of the body-surface electrodes and the surface of the body. Also described are methods for sensing the position of a probe and for detecting tissue contact based on a relation between currents from the probe to body-surface electrodes.

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