Method and a device for calibrating a blood pressure estimation model for determining tonoarteriogram signals

A method of calibrating a blood pressure estimation model for determining tonoarteriogram (TAG) signals, comprising:

• via a device adapted to apply adjustable pressure, applying a pressure to a first location of a body of a target subject;
• wherein the device adapted to apply adjustable pressure comprises a ring-shaped device,
• via a PTT determining module:
• in response to the pressure applied, detecting a plurality of pulse waves at a region of the body within a preset time period, and determining a plurality of respective pulse transit times (PTT) of said plurality of respective pulse waves at respective moments of time during a movement of the body;
• wherein the first location is used as an initial location;
• via a sample blood pressure information determining module:
• performing a derivation for a curve composed of the plurality of respective PTT at the respective moments of time, and determining a plurality of moments of time when a derivative satisfies a first condition as a plurality of first moments of time;
• acquiring a first pressure of each of the first moment of time from the plurality of moments of time;
• acquiring a second pressure according to a distribution of the plurality of first pressures of the plurality of first moments of time;
• acquiring a first height difference of the first location relative to a heart location at each of the first moment of time;
• obtaining a first target height difference according to a distribution of all of the first height differences;
• determining a sample blood pressure information within the preset time period according to the second pressure and the first target height difference;
• the sample blood pressure information comprises at least one of a sample mean blood pressure, a sample systolic blood pressure (SBP) and a sample diastolic blood pressure (DBP);
• via a blood pressure estimation model:
• based on the sample blood pressure information and a sample physiological signal at a plurality of preset time periods, performing calibration for a pre-established initial blood pressure estimation model indicating a relationship between blood pressure information and physiological signal, and obtaining a target blood pressure estimation model;
• via a beat-to-beat pressure information determining module:
• acquiring a continuous target physiological signal of the target subject, inputting the continuous target physiological signal to the target blood pressure estimation model;
• wherein the continuous target physiological signal comprises a continuous target PPG signal;
• acquiring a plurality of beat-to-beat blood pressure information output by the target blood pressure estimation model;
• and
• via a TAG signals determining module:
• determining a TAG signal of the target subject according to the continuous target PPG signal and the plurality of beat-to-beat blood pressure information.