Desarrollo e implementación de electrodos capacitivos para un sistema inalámbrico de monitoreo de señales de EKG

Abstract

CONDITION FOR PUBLICATION OF PROJECT. present degree project aims to design and implement capacitive electrodes for continuous monitoring of electrocardiographic (EKG) signals, to overcome the limitations of conventional wet electrodes, which must be applied directly to the skin, require prior preparation in the application area and can cause irritation. It is proposed that capacitive electrodes allow signals of comparable quality to be acquired, offering noninvasive, comfortable and portable monitoring, suitable for ambulatory and telemedicine settings. Prototype development included the design of three capacitive electrodes (RA, LA and LL), an active reference electrode (RL), and an analog processing electronics system. The acquired signals were digitized and transmitted wirelessly via Bluetooth to a PC for visualization and analysis. The system was validated by comparing the signals obtained with the prototype and those from commercial equipment that uses wet electrodes, using Pearson's correlation coefficient and the root mean square error (RMSE). In direct contact, the coefficients were greater than or equal to 0.8 and the RMSE values were less than or equal to 0.2, reflecting a good linear correlation. In non-contact mode, values greater than or equal to 0.75 were achieved, and RMSE values less than or equal to 0.3, demonstrating acceptable performance. The results demonstrate that the developed system is a viable alternative for continuous EKG monitoring, with advantages in comfort, accuracy and adaptability to various conditions of use. Keywords: capacitive electrodes, EKG, continuous monitoring, biopotentials, telemedicine.