Monitoring myoelectric signals
First Claim
1. A neurological monitor for measuring the spectral variation in a myoelectric signal, comprisingan electrode suitable for contacting a living being and detecting said myoelectric signal,circuitry for processing said myoelectric signal to provide a display signal representative of said spectral variation, said circuitry comprisingmeans for amplifying said myoelectric signal to provide an amplified signal,filter means for providing a filtered signal corresponding to a portion of said amplified signal having frequency components on one side of a variable cutoff frequency,means for comparing said filtered signal to a reference signal and providing a control signal that is dependent on the difference in magnitude between said filtered and reference signals,means for automatically varying said cutoff frequency in accordance with the value of said control signal,means for providing a display signal representative of said spectral variation in said myoelectric signal, anda display driven by said display signal, for observing said spectral variation in said myoelectric signal.
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Accused Products
Abstract
Muscle fatigue monitor featuring, in one aspect, detecting a myoelectric signal and providing an electrical output; providing a first signal corresponding to a portion of said output having frequency components above a first cutoff frequency, and a second signal corresponding to a portion of said output having frequency components below a second cutoff frequency; providing a control signal corresponding to the difference in magnitude between said first and second signals; varying said cutoff frequencies in accordance with the value of said control signal; and displaying the variation of said cutoff frequencies as a function of time.
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Citations
18 Claims
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1. A neurological monitor for measuring the spectral variation in a myoelectric signal, comprising
an electrode suitable for contacting a living being and detecting said myoelectric signal, circuitry for processing said myoelectric signal to provide a display signal representative of said spectral variation, said circuitry comprising means for amplifying said myoelectric signal to provide an amplified signal, filter means for providing a filtered signal corresponding to a portion of said amplified signal having frequency components on one side of a variable cutoff frequency, means for comparing said filtered signal to a reference signal and providing a control signal that is dependent on the difference in magnitude between said filtered and reference signals, means for automatically varying said cutoff frequency in accordance with the value of said control signal, means for providing a display signal representative of said spectral variation in said myoelectric signal, and a display driven by said display signal, for observing said spectral variation in said myoelectric signal.
Specification