Two speed system for EEG recording
First Claim
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1. A system for recording EEG electrical body waveforms comprising:
- means for detecting an EEG waveform and producing an electrical signal representing said waveform,means for comparing the amplitude of said electrical signal with a predetermined amplitude level and producing a trigger signal when said amplitude of said electrical signal exceeds said predetermined level,means responsive to said electrical signal for producing a graphical representation of said waveform on a strip of recording material,means for driving said strip of recording material past said representation producing means, andmeans for causing said driving means to change the speed at which said recording material is driven from a first speed to a second speed higher than said first speed when said comparing and producing means produces said trigger signal.
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Abstract
A method and system for recording EEG waveforms whereby the amplitude of the waveform signal in both positive and negative direction is compared with variable levels and a trigger signal produced when the amplitude exceeds a level to cause the strip of recording paper to speed up for at least a predetermined time and to continue for the length of the seizure so that little paper is accumulated during periods of uninteresting activity while a complete readable record is produced of any notable EEG activity, such as an epileptic seizure.
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Citations
16 Claims
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1. A system for recording EEG electrical body waveforms comprising:
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means for detecting an EEG waveform and producing an electrical signal representing said waveform, means for comparing the amplitude of said electrical signal with a predetermined amplitude level and producing a trigger signal when said amplitude of said electrical signal exceeds said predetermined level, means responsive to said electrical signal for producing a graphical representation of said waveform on a strip of recording material, means for driving said strip of recording material past said representation producing means, and means for causing said driving means to change the speed at which said recording material is driven from a first speed to a second speed higher than said first speed when said comparing and producing means produces said trigger signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for recording EEG electrical body waveforms comprising:
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means for detecting an EEG signal and producing an electrical waveform signal, means connected to said detecting and producing means for producing a trigger signal when the amplitude of said waveform signal in at least one polarity exceeds a predetermined level with respect to a given reference, means responsive to said waveform signal for producing a graphical representation of said waveform on a strip of recording material, means for driving said strip past said representation producing means, and means for changing the speed at driving said strip for a predetermined time from a first speed to a second speed higher than said first speed upon production of said trigger signal. - View Dependent Claims (16)
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Specification