Patch for improved biometric data capture and related processes

A patch device comprising:

• a photoplethysmography (PPG) sensor comprising at least one light emitting diode (LED);
• an accelerometer;
• an adhesive layer configured to adhere to skin of a chest of an individual;
• one or more rigid components connected to the adhesive layer, the one or more rigid components comprising a hardware processor for communication with the PPG sensor, the hardware processor configured to receive a plurality of measurements from each of the PPG sensor, wherein:
• the hardware processor is configured to determine a plurality of cardiorespiratory parameters via chest accelerometry;
• the hardware processor is further configured to determine inertial measures of thoracoabdominal movement;
• and
• the plurality of cardiorespiratory parameters are determined based at least in part on the inertial measures of thoracoabdominal movement;
• and
• an air gap between a lower surface of the adhesive layer and a lower surface of the PPG sensor for providing a compressive downward force when the adhesive layer and the PPG sensor are in contact with the skin of the chest of the individual, thereby improving signal quality of the PPG sensor, wherein:
• the PPG sensor passes through the adhesive layer;
• the adhesive layer and the PPG sensor are configured to be in contact with the skin of the chest of the individual simultaneously with at least a portion of the air gap therebetween;
• and
• the hardware processor is further configured to:
• measure, via the PPG sensor, cutaneous blood flow and volume;
• and
• determine blood oxygen saturation (SpO2) derived from the cutaneous blood flow and volume.