Nystagmus processor for EEG machines

Details Nystagmus processor for EEG machines Nystagmus processor for EEG machines

1977-06-09

1979-05-22

Michell, Robert W.

Surgery

Truss

Pad

128745, A61B 505

Patent

active

041553527

ABSTRACT:
A pair of active probes and a datum probe are affixedto the patient, and the active probes' signals are coupled to a preamplifier involving both common mode rejection and differential amplification. The information bearing voltage levels are coupled to a voltage controlled oscillator, the output of which bears information in the form of frequency variations. A photocoupler isolates the patient from unwanted feedback, and drives a phase locked loop which demodulates the signal back to an information bearing voltage. The derivative of the voltage signal is taken, is separated by polarity to correspond to the direction of eye motion, and is coupled to the EEG, thereby representing nystagmus velocity.

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Roby, R. J., et al., "A Simplified Circuit for Stimulus-Artifact Suppression," EEG and Clin-Neurophys., v. 39, No. 1, pp. 85-877/75.
Ray, C. D., "Medical Engineering: Quantitative B, Techniques in EEG," Yearbook Publishers, Chicago 1974, p. 391.
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Huntsman, L. L. et al., "A Low-Cost Hi-Gain Amplifier with Exceptional Noise Performance," IEEE Transactions on Biomed Engr., v. 18, #4, Jul. 1971, pp. 301-302.
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Grieco, A. et al., "A New Apparatus for the Simultaneous Quantitative Evaluation of Several Biological Signals Relevant to Work Physiology," Med. & Biol. Engr., 1971, v. 9, pp. 705-710.

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