Microprocessor Based Electromyograph

Introduction

Electromyography deals with electrical signals associated with neuromuscular activity. An electromyograph (EMG) is an instrument which senses such signals with the help of suitable electrodes and displays the signal pattern on an oscilloscope type screen. These waveforms are used by neurologists for diagnosis of neuromuscular disorders. 

Microprocessor based electromyograph enables clinicians to concentrate more on the patient by providing him with the desired information on the displays in a reliable and unambiguous manner. This instrument is based on 8085 microprocessor. 

It employs a needle or surface electrode is employed to sense the EMG signal from the muscle being investigated. Muscle action potentials, when integrated spatially and temporally, generate the complex EMG signal patterns which is displayed on the screen on live channel. While 'Freezing', a portion of the EMG waveform is digitized and stored in the memory. This 'stored' waveform is then displayed on the second channel. The waveform storage facility allows detailed scrutiny of the signal pattern even when the electrode is disconnected. The instrument also has a built in voltage stimulator to carry out stimulus-response studies. The amplitude, and repetition rate of the stimulator, can be selected from the front panel settings. In 'Decremental Response' (DR) mode, the decremental response can be studied for five successive stimuli. Signal averaging facility has been incorporated to enable an improved signal to noise ratio for stored signals. An audio amplifier with a loud speaker enables audible indication of the live EMG signal pattern.

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Head, Technology Transfer & Collaboration Division,
Bhabha Atomic Research Centre,
Trombay, Mumbai- 400 085
Tel : 091-022-25593897
Fax : 091-022-25505151 / 25519613
Email : headttcd@barc.gov.in