Apparatus and method using the second derivative of a waveform oscillometric in order to produce information sphygmometrique

摘要

P the invention relates to a method and apparatus for determining the blood pressure. / p & & p & a variable pressure is applied with the aid of a sleeve and a quantity is measured, which is formed by the sum of the applied pressure and of a component with the pulsating blood pressure; a drift in time, in particular, at least of the fluctuating component is formed and used to determine the blood pressure; this derivative in the time is the second derivative which is analysed to determine to which it intersects the pressure applied to the first and last time in the direction which is negative, a reference value that is negative, these points determining the pressure in diastolic and systolic responses, depending on whether the applied pressure is increased or decreased. / p