Provided is a non-invasive electronic method and apparatus for measuring
blood pressure, in which the data is processed with an
algorithm of non-
linear fitting for recovering trend envelope of an oscillating PW by a
firmware, so that the trend envelope of PW amplitude can be recovered accurately, and the obtained average pressure shows higher degree of agreement with the real situation in clinic. In this apparatus, a 3-way
solenoid valve (20) is arranged between a
cuff (10) and a first
pressure sensor (30), wherein the common port of the 3-way
solenoid valve (20) is connected with the first
pressure sensor (30), the normally
open port thereof connected with the
cuff (10), and the normally closed port thereof connected with the
air atmosphere during zeroing process. Moreover, an independent timing circuit (45) is provided additionally. In the measurement method of the present invention, the zeroing is performed with the help of the 3-way
solenoid valve (20). Once a state of overtime or
overpressure occurs, an air bump (50) is immediately closed, and a quick-deflation solenoid valve (60) is opened so that the pressure in the
cuff (10) is released to ensure safe application.