ECG measurement by use of passive capacitively coupled electrodes

The prototype of a capacitive ECG measurement device with purely passive signal transmission between electrodes and differential amplifier is presented. This design is intended to improve transmission symmetry and thus common-mode rejection. The feasibility of the approach is demonstrated by measurements with different materials between body surface and electrodes. The ECG module shall be incorporated in a mobile sensor platform in the form of a plaster for the monitoring of chronic diseases.