Patent ID: 8528552

Claim:
A process for controlling a respirator, the respirator comprising a control and calculating unit, a gas path, a gas-mixing unit, a gas-metering unit, a measuring arrangement for measuring an oxygen saturation, an input unit and a controller, the process comprising the steps of: providing a humidifying unit; providing at least one time function element; simulating one or more time responses of the respirator and said humidifying unit, the measuring arrangement for measuring an oxygen saturation and a patient in said at least one time function element; providing a set value of an oxygen concentration in the respirator, wherein a run time of a change in the oxygen concentration through at least said humidifying unit is determined based on at least said set value of said oxygen concentration and said one or more time responses of said respirator and said humidifying unit; determining a saturation-effective oxygen concentration based on at least said run time of said change in said oxygen concentration; determining a measured value of a current oxygen saturation; providing a set point of an oxygen saturation to the respirator; determining a difference value of an oxygen concentration from said set point of the oxygen saturation and said measured value of the current oxygen saturation; and linking said difference value of the oxygen concentration with said saturation-effective oxygen concentration to form an updated set value of the oxygen concentration and setting a metering of said oxygen concentration in the respirator based on said updated set value of the oxygen concentration, wherein said updated set value of the oxygen concentration is provided as input to said at least one time function element.