Blood pressure measurement method for wearable device and wearable device

A wearable device, comprising:

• a memory storing a computer program;
• a processor coupled to a memory;
• three pressure transducers (PTs);
• and
• a photoplethysmography (PPG) sensor, wherein the PPG sensor comprises three light emitting diodes (LEDs) and one photo diode (PD), the one PD is located at a central position of the PPG sensor, and the three LEDs and the three PTs are all arranged around the PD in a circular array;
• wherein the three PTs and the PPG sensor contact a wearer when the wearable device is in a worn state;
• wherein the processor is configured to execute the computer program to cause the wearable device to perform operations comprising:
• obtaining a plurality of pressure values collected by the three PTs;
• obtaining a plurality of PPG signals collected by the PPG sensor;
• and
• determining a blood pressure value of the wearer based on the plurality of pressure values and the plurality of PPG signals;
• wherein the plurality of pressure values are in one-to-one correspondence with the plurality of PPG signals, and a collection moment of each pressure value of the plurality of pressure values is same as that of a corresponding PPG signal of the plurality of PPG signals;
• and
• wherein the determining the blood pressure value of the wearer comprises:
• respectively extracting waveform features of the plurality of PPG signals;
• and
• determining, based on a first PPG signal whose waveform feature amplitude is less than or equal to a preset waveform feature amplitude, a pressure value corresponding to the first PPG signal as a systolic blood pressure (SBP) in the blood pressure value of the wearer.