Referring to Fig. 1, the overall concept relies on three main components. The battery-free patch, the electrophysiological acquisition/transmission electronics, and the scanner device composed of an energy transfer coil and the application for receiving the data. In this work, the coil and the smartphone are used separately. Such system can be used in different scenarios. This can include a data-on-request system for caregivers to check the patient’s condition with a scanner device based on a schedule. This system may be extended to a continuous monitoring system, provided that a transmission coil can be integrated into the patient’s clothing (not the focus of this article). Also, such architecture can be extended to data-on-request on implanted devices. For the case-study presented in this work for heartbeat estimation, the patch includes a receiver coil and two electrodes.
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