Surgery – Diagnostic testing – Measuring electrical impedance or conductance of body portion
Patent
1996-05-09
2000-01-04
O'Connor, Cary
Surgery
Diagnostic testing
Measuring electrical impedance or conductance of body portion
600535, A61B 505
Patent
active
060119926
ABSTRACT:
A system for measuring changes in the resistance of a living body includes a resistance measuring circuit, an amplifier circuit and an indicator circuit in which the amplifier circuit includes a calibration circuit to give a generally constant amplitude response to a given measured input. Radio frequency insulators are included to reduce noise in the system. The circuits are operated such that when an overall change in the resistance of a living body occurs, the resistance measuring circuit is adjusted to determine the overall resistance. To account for changes in sensitivity caused by the overall change in resistance, the gain of the amplifier circuit is automatically adjusted to thereby maintain a generally constant amplitude response.
REFERENCES:
patent: 3991746 (1976-11-01), Hanna
patent: 4300579 (1981-11-01), Briggs
patent: 4459995 (1984-07-01), Conners et al.
patent: 4578635 (1986-03-01), Mee et al.
Hubbard, deceased Lafayette Ron
McCormick John
Starkey, legal representative by Norman F.
Stavropoulos James
Stinnett Richard
Church of Spirtual Technology
O'Connor Cary
Wingood Pamela L.
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