Effects of Configuration and Dimension of Concentric Ring Electrodes in EEnG Recording Applications

Implementing Laplacian techniques through ring electrodes in bioelectrical records can improve the signal quality and spatial resolution in comparison to that obtained with conventional disk electrodes. Different dimensions of the rings and recording settings in one electrode can facilitate bioelectric mapping, and provide flexibility to studies in the field of bioelectrical signal recording. A concentric multi-ring electrode (multi-CRE), flexible, with gel, auto-adhesive, that can be configured for monopolar and bipolar records is presented in this paper. Simultaneous recording of intestinal myoelectric activity (electroenterogram, EEnG) by means of multi-CRE and conventional disk electrodes, respiration and electrocardiogram signals were performed in healthy subjects. The results revealed that the ability to detect intestinal slow waves was greatly influenced by the ability to reject its main interferences. Regarding the recording configuration, it can be concluded that the use of flexible concentric electrodes in bipolar configuration improves the quality of EEnG signals. Regarding to the effect of the electrode size, the middle ring (30 mm) reached a balance between better performance against respiratory interference of small rings and better response to low frequency interference of large rings.

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