Method and apparatus for reducing noise and detecting...

Details Method and apparatus for reducing noise and detecting... Method and apparatus for reducing noise and detecting...

2005-12-13

2005-12-13

Layno, Carl H. (Department: 3762)

Surgery

Diagnostic testing

Sensitivity to electric stimulus

C600S508000, C600S547000

Reexamination Certificate

active

06974420

ABSTRACT:
A method and apparatus for reducing noise and detecting electrode faults in a physiological activity acquisition system. The method includes the act of delivering a carrier signal through an electrode connected to a subject. Once the carrier signal is delivered, a combined signal having an electrical-activity portion and a carrier-signal portion is sensed by at least one signal sensing electrode attached to the subject. A low-pass, finite impulse response filter, having a first zero point frequency substantially the same as the carrier signal, separates the carrier signal portion from the electrical activity portion. An impedance value for the sensing electrode is calculated using the carrier signal portion. The calculated impedance value is compared against a known value to determine whether an electrode fault exists.

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John G. Webster, Editor; Medical Instrumentation-Application and Design, John Wiley & Sons, Inc., New York, (3rd Ed. 1998) pp. 276- 277.

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