System and method for physiological parameter monitoring

1. A device, comprising:

a storage device storing instructions; and

at least one processor in communication with the storage device, wherein when executing the instructions, the at least one processor is configured to cause the device to perform operations comprising:

receiving a first signal representing heart activity of a subject,

receiving a plurality of second signals representing time-varying information on a pulse wave of the subject;

determining a blood oxygen level of the subject based on the plurality of second signals;

selecting a second signal from the plurality of second signals based on a preset condition relating to a parameter of each of the plurality of the second signals and a parameter regarding an acquisition process of the plurality of second signals;

identifying a first feature in the first signal;

identifying a second feature in the selected second signal;

determining a pulse transit time based on a difference between the first feature and the second feature; and

determining a blood pressure of the subject based on the pulse transit time.

2. The device of claim 1 , the receiving the first signal comprising communicating with a first sensor configured to acquire the first signal of the subject.

3. The device of claim 2 , the first sensor comprising a plurality of electrodes.

4. The device of claim 1 , the receiving the plurality of second signals comprising communicating with one or more second sensors.

5. The device of claim 4 , one of the one or more second sensors comprising a photoelectric sensor.

6. The device of claim 1 , the first signal or at least one of the plurality of second signals comprising an optical signal or an electric signal.

7. The device of claim 1 , wherein,

the first feature of the first signal corresponds to a first time point;

the identifying the second feature comprises:

selecting a segment of the selected second signal, the segment occurring within a time window from the first time point; and

locating the second feature corresponding to a second time point in the segment; and

the determining the pulse transit time comprises determining a time interval between the first time point and the second time point.

8. The device of claim 1 , wherein the first signal or the selected second signal comprises an ECG waveform, a PPG waveform, or a BCG waveform.

9. The device of claim 1 , wherein the at least one processor is further configured to cause the device to communicate with a cuff-based blood pressure monitor.

10. The device of claim 9 , the cuff-based blood pressure monitor being configured to coordinate a blood pressure measurement with the receiving of the first signal or the receiving of the plurality of second signals.

11. The device of claim 10 , wherein the cuff-based blood pressure monitor is further configured to provide a set of calibration data acquired at a second time interval, the set of calibration data being used to calibrate the determining of the blood pressure.

12. The device of claim 1 , wherein the plurality of second signals are acquired in real time or at a first time interval.

13. A method implemented on a device including at least one processor, the method comprising:

receiving a first signal representing heart activity of a subject;

receiving a plurality of second signals representing time-varying information on a pulse wave of the subject;

determining a blood oxygen level of the subject based on the plurality of second signals;

selecting a second signal from the plurality of second signals based on a preset condition relating to a parameter of each of the plurality of the second signals and a parameter regarding an acquisition process of the plurality of second signals;

identifying a first feature in the first signal;

identifying a second feature in selected second signal;

determining a pulse transit time based on a difference between the first feature and the second feature; and

determining a blood pressure of the subject based on the pulse transit time.

14. The method of claim 13 , further comprising acquiring the first signal at a first location on the body of the subject.

15. The method of claim 13 , further comprising acquiring the selected second signal at a second location on the body of the subject.

16. The method of claim 13 , the first signal or at least one of the plurality of second signals comprising an optical signal or an electric signal.

17. The method of claim 13 , wherein,

the first feature of the first signal corresponds to a first time point;

the identifying the second feature comprises:

selecting a segment of the selected second signal, the segment occurring within a time window from the first time point; and

locating the second feature corresponding to a second time point in the segment; and

the determining the pulse transit time comprises determining a time interval between the first time point and the second time point.

18. The method of claim 13 , wherein the plurality of second signals are acquired in real time or at a first time interval.

19. The method of claim 13 , further comprising acquiring a set of calibration data from a cuff-based blood pressure monitor, the set of calibration data being used to calibrate the determining of the blood pressure.

20. The method of claim 19 , wherein the set of calibration data is acquired at a second time interval.