A highly integrated flexible array non-contact ECG sensing electrode based on FPC

The existing array non-contact ECG sensing technology mostly uses rigid electrode or conductive fabric electrode, in which the rigid electrode is too hard to make the electrode difficult to close to the human body well, and the conductive fabric electrode is too soft to cause the electrodes to be wrinkled, both of which will lead to poor ECG signal quality. In order to overcome the problem that it is difficult to obtain high-quality ECG signals due to electrode materials, this study combined the manufacturing process of Flexible Printed Circuit (FPC) with the surface treatment process of Electroless Nickel/Immersion (ENIG) and adopted polyimide (PI) and rolled copper as electrode materials, which makes the array electrode electrodes extremely flexible, tough, and flat. At the same time, in terms of electrode design, the test and verification of the electrode unit also ensured the rationality of the array electrode. Subsequently, the electrode was verified by electrode test and human experiment, and the results showed that the electrode could receive ECG signals well, and compared with the ECG signals obtained by the traditional Ag/AgCl electrodes, the signal-to-noise ratio (SNR) of the signals obtained by the two types of electrodes reached above 38 dB and the waveform characteristics were highly consistent.