Opened-Ring Electrode Array for Enhanced Non-invasive Monitoring of Bioelectrical Signals: Application to Surface EEnG Recording

The estimation of Laplacian potential on the body surface obtained by means of concentric ring electrodes can provide bioelectrical signals with better spatial resolution and less affected by bioelectrical interferences than monopolar and bipolar recordings with conventional disc electrodes. In this paper an array of flexible concentric opened-ring electrodes for non-invasive bioelectrical activity recordings is presented. A preconditioning circuit module is directly connected to the electrode array to perform a first stage of filtering and amplification. A computer model reveals differences minor than 1 % between the sensitivity of the proposed opened-ring electrode vs a closed-ring electrode. Simultaneous recordings of intestinal myoelectrical activity proved that signals from the developed array of electrodes presented lower electrocardiographic and respiratory interference than conventional bipolar recordings with disc electrodes. The small bowel’s slow wave myoelectrical activity can be identified more easily in the recordings with the presented ringed-electrodes.

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