Abstract: The invention relates to a respiratory device for ventilating a patient. The respiratory device comprises a respirator that is or can be linked with an endotracheal tube or a respiratory mask. The respiratory device is provided with a control/regulation unit (1) for controlling and checking the expiration phase and with actuators (2, 39) controlled by the unit for actively influencing expiration and producing any expiration pattern during the expiration phase.

Abstract: A respirator with an adjustable pressure or volume flow curve has a control and analyzing unit, which is set up to determine the resistance R and the alveolar pressure Palv(t). The control and analyzing unit checks the functional dependence of Palv(t) and of the tidal volume Vol(t) for time intervals in which an indicator of the quality of a linear functional dependence of Palv(t) and Vol(t) meets a preset threshold criterion and to determine the elastance E or compliance C from the rise of the alveolar pressure Palv(t) as a function of the volume Vol(t) only in the time intervals thus determined.