Desenvolvimento de um eletromiógrafo de baixo custo

Abstract

The present work describes the design of a circuit for the acquisition of electromyographic signals using low-cost materials. The EMG (electromyographic) signal is the result of the electrical activity of muscle cells and the electromyograph is the equipment capable of performing the acquisition of these signals. All calculations and mathematical concepts that underlie the design of filters and amplifiers will be presented, showing the individual simulation in computer software and the physical implementation of the circuit with all its necessary characteristics. The calculations consider the characteristic of the electromyographic signal to define the biological frequency range. The validation process was carried out experimentally, where signs of voluntary muscle contractions were captured from the patient's right biceps, with different intensities and in different places in the circuit. Thus, the study of the Signal/Noise ratio was carried out at each stage of the circuit, demonstrating the functionality of the filters.