公开(公告)号：US11751790B1

公开(公告)日：2023-09-12

申请号：US16551704

申请日：2019-08-26

Applicant: Apple Inc.

Inventor： Priyank Dineshbhai Patel ,  Nilay D. Jani

IPC: A61B5/276 ,  H03K17/687 ,  A61B5/00 ,  A61B5/339

CPC classification number: A61B5/276 ,  A61B5/339 ,  A61B5/681 ,  A61B5/6826 ,  A61B5/7221 ,  H03K17/687 ,  A61B2562/0209

Abstract: Galvanic corrosion of an external electrode of a physiological signal sensor (e.g., ECG sensor) can be reduced. In some examples, protective circuitry, such as a switching circuit, can be used to reduce galvanic corrosion. In a first mode of operation (e.g., corresponding to measurement by the physiological signal sensor), the switching circuit can provide a low-impedance path (e.g., from an external electrode to ground). In a second mode of operation (e.g., corresponding to non-measurement by the physiological sensing system), the switching circuit can provide a high-impedance path to reduce leakage currents (e.g., between the external electrode and ground), and thereby reduce galvanic corrosion.