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Appliance and Method for Measuring an Emg Signal

The present invention relates to an appliance for the direct measurement, display, processing and transmission, remotely, of electromyographic signals (EMG) comprising: an electrical stimulator (1) comprising electrodes for the excitation of a peripheral motor nerve; a pair of electrodes (31), for the acquisition of the EMG response at the level of the muscle associated with this peripheral nerve; an acquisition chain (2) driven by a micro-controller (3, 39), presenting means of conditioning of the input signal, comprising at least one differential preamplifier (22, 33), a bandpass filter (25, 34) and an analog/digital converter (ADC) (26, 310), said acquisition chain (2) being linked, via a standardized interface (5), to a computer (4) comprising means of storage (9) and of display of the EMG signals acquired as well as an executable program for effecting the interface with the user (6) and utilizing the data stored; characterized in that the acquisition chain (2) comprises means of automatic adjustment of the amplification gain of the EMG signal (23, 24, 311, 38), via the microcontroller, in such a way that the EMG signal covers the largest possible part of the input voltage span of the ADC (26, 310), hence with conservation of resolution, when the amplitude of the EMG signal decreases.
Owner:UNIV LIBRE DE BRUXELIES
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