Method for carrying out a P/V maneuver which automatically prevents an overdilation of the lungs, and ventilation device designed to carry out the method

A ventilation device for artificial ventilation of a patient, comprising:

• a respiratory gas source arrangement which provides an inspiratory respiratory gas for artificial ventilation the patient,
• a flow modification device which is configured to produce and quantitatively modify an inspiratory respiratory gas flow,
• a respiratory gas line arrangement with a proximal longitudinal end which during operation lies nearer to the patient and with a distal longitudinal end which during operation lies further away from the patient, in order to convey the inspiratory respiratory gas flow from the respiratory gas source arrangement towards the patient,
• a flow sensor arrangement which is configured to acquire quantitatively both the inspiratory respiratory gas flow and an expiratory respiratory gas flow,
• a pressure sensor arrangement which is configured to acquire a pressure both of the inspiratory respiratory gas and of the expiratory respiratory gas in the respiratory gas line arrangement,
• a control device with a data memory, where the control device is connected for signal transmission with the data memory, with the flow sensor arrangement, and with the pressure sensor arrangement and which is configured to control the operational output of the flow modification device for modifying the inspiratory respiratory gas flow,
• where the control device is configured to actuate the flow modification device for performing a P/V maneuver in which in an inspiration phase, respiratory gas is supplied to a patient under elevated respiratory gas pressure which in an expiration phase after completion of the pressure elevation flows passively out of the patient, where both during the inspiration phase and during the expiration phase, for a plurality of respiratory gas pressures, the respective maneuver respiratory gas volume present in the patient due to the P/V maneuver is determined in correlation with the prevailing respiratory gas pressure, wherein the control device is configured
• to determine during the inspiration phase, on the basis of signals of the flow sensor arrangement and of the pressure sensor arrangement, a sequence of compliance values each of which represents a pulmonary compliance of the lung of the patient,
• to determine a reference compliance value in accordance with the sequence of compliance values,
• to determine as termination criterion for the inspiration phase, starting from the reference compliance value, a termination compliance value quantitatively different from the reference compliance value as threshold value, and
• to terminate the inspiration phase when the termination compliance value is reached or crossed.