Patent ID: 8950399
Filing Date: 2015-02-10
Classification: A61B,A61M

Abstract:
1. A method for automatically controlling a ventilation or breathing system, the method comprising the steps of: providing a ventilation or breathing system with a ventilation unit controlled by a control unit for delivery of an assist pressure preset by said control unit; detecting current values of the tidal volume flow (Flow(t)) and of the volume (V(t)) and providing the detected values to said control unit; carrying out a proportionally supporting ventilation method (PAV: Proportional Assist Ventilation) with the control unit with a factor for a degree of compensation (PPSp) being selected by the control unit and by the parameters for the volume assist (VA) and the flow assist (FA) being determined by: wherein ΔE is the deviation of a measured or assumed elastance (E using an assist pressure (PS(t)) determined by the control unit from VA and FA wherein PS(t)=VA·V(t)+FA·Flow(t) is determined to set the ventilation unit such as to deliver this assist pressure; providing an input of a value for a desired assist pressure (PS calculates a representative assist pressure <PS>, which is determined as a mean over time, as a weighted mean, as a median or as a maximum of the time curve of PS(t) during the inspiration over one breathing cycle or over a plurality of breathing cycles; and determines a new value for the degree of compensation PPSp said control unit determines the value for the amplification V wherein k is a constant and wherein the assist pressure PS(t) is limited to a pressure limit value that is related to the desired assist pressure PS desired .