Blood pressure measurement systems and methods

A blood pressure measurement method comprising:

• detecting a first wave signal from a blood vessel by using a bioinformation measurement device during a first pressing period of a wearable pressing unit, in which the wearable pressing unit exerts pressure on an upstream blood vessel relative to the blood vessel;
• generating an envelope signal of the first wave signal according to the first wave signal;
• detecting a second wave signal of the blood vessel by using the said bioinformation measurement device during a second pressing period of the wearable pressing unit;
• determining a first timepoint where the waveform of the second wave signal intersects with the waveform of the envelope signal;
• outputting the pressure value that the wearable pressing unit exerts on the upstream blood vessel at the first timepoint as a systolic pressure value;
• determining a second timepoint where the envelope signal has a predetermined amplitude;
• and
• outputting the pressure value that the wearable pressing unit exerts on the upstream blood vessel at the second timepoint as a diastolic pressure value.

A system for blood pressure measurement of an individual for use with a bioinformation measurement device and a pressing unit, the system comprising:

• a controller configured to electronically communicate with the pressing unit and the bioinformation measurement device;
• where the controller is configured to incrementally increase a pressure applied by the pressing unit on a body part of an individual during a first pressing period to compress the body part to affect blood flow in an upstream blood vessel in the body part;
• where the bioinformation measurement device is configured to produce a first wave signal representative of blood activity from a downstream blood vessel during the first pressing period and transmitting the first wave signal to the controller;
• where the controller generates an envelope signal using the first wave signal;
• wherein the controller is configured to establish a second pressing period by determining when the bioinformation measurement device fails to detect the blood activity;
• where the bioinformation measurement device is configured to produce a second wave signal of the blood vessel by using the bioinformation measurement device during the second pressing period;
• where the controller determines a first timepoint where a waveform of the second wave signal intersects with a waveform of the envelope signal to establish a systolic pressure value using a first pressure value that the pressing unit exerts on the upstream blood vessel at the first timepoint;
• and
• where the controller also determines a second timepoint where the envelope signal has a predetermined amplitude to establish a diastolic pressure value using a second pressure value that the pressing unit exerts on the upstream blood vessel at the second timepoint.