A CINVESTAV research group, headed by Ernesto Suaste Gómez, created new electrodes –used in electrocardiograms, electroencephalograms and electromyogram– improving their frequency response and material conductivity and reducing noise.
For this they used a combination of polymers from PVC and Polypyrrole, which are ground and mixed in order to incorporate the connector cable that sends the electrical signals to the signal measuring device, thus avoiding the need to connect cables to the electrodes, improving the certainty of the signals.
The rigid sensation of the metallic material with which the electrodes are made, generally used for measurement in electroencephalograms or electrocardiograms, is an unpleasant experience for a person who attends such medical studies; and the preparation by the technicians in charge of placing them is not so easy either, because they must ensure the proper connection so that the measurement is accurate.
During the tests carried out by the research group it was shown that the new electrodes recorded the electrophysiological signals of the body similar to commercial options.
“We have improved frequency response, material conductivity and noise reduction. If you compare conventional electrodes we have very significant noise reduction (interference), which facilitates the handling of the signal in the electronic part, the electrical record given by the body signals is better and consequently the diagnosis is more accurate,” Suaste Gómez said
The manufacturing of the new CINVESTAV electrodes represent the greatest advantage. As they are made by a mixture of polymers, it is easier to inject the material into molds avoiding the need of machinery used in common electrodes.
In addition, as they are made from plastic, the electrical connection cable is embedded in the resin, while in commercial options it is necessary to weld them or put a clamp that sometimes creates false contact, impacting on the quality of diagnosis.
Source: Conexion Cinvestav