Multi-sensor patch

A method of sensing the heart rate and blood oxygen saturation of a maternal patient and a fetal patient, the method comprising:

• providing a multi-sensor patch to the abdomen of a maternal patient, the multi-sensor patch configured for simultaneous abdominal monitoring of maternal and fetal physiological data;
• wherein the multi-sensor patch comprises:
• a multi-layer flexible substrate comprising a center region and a plurality of electrode regions, a conductive layer of the flexile substrate providing an electrical connection between each of the plurality of electrode regions and the center region;
• a plurality of electrodes formed into the flexible substrate with an electrode of the plurality of electrodes located in each of the electrode regions, each of the electrodes configured to produce the biopotential data;
• and
• an optical sensor comprising a plurality of photoemitters and a plurality of photodetectors to produce the photosignal data and a pulse oximetry sensor that is connected to the multi-layer flexible substrate;
• obtaining maternal electrocardiogram (mECG) data and fetal electrocardiogram (fECG) data with the plurality of electrodes;
• obtaining photosignal data with the optical sensor, the photosignal data comprising a maternal photosignal component and a fetal photosignal component;
• applying mECG to the photosignal data to calculate maternal photoplesthysmograph (mPPG) data;
• applying the mPPG to the photosignal data to remove the maternal photosignal component from the photosignal data;
• and
• applying the fECG to remaining photosignal data to calculate fetal photoplesthysmograph (fPPG) data.