Process for supporting blood gas exchange by ventilation and extracorporeal blood gas exchange and system operating according to the process

A process for operating a system for supporting a blood gas exchange of a patient by ventilation as well as by extracorporeal blood gas exchange by a CO2 removal wherein the system comprises:

• a medical device comprising a ventilator;
• a medical device comprising a CO2 removal device for the extracorporeal blood gas exchange;
• a controller configured to act on the CO2 removal device;
• and a sensor system configured to detect a current measured value concerning an expiratory CO2 concentration in the breathing gas of the patient, and wherein the current measured value is selectable as a start value by an operating action at the system wherein a difference of a trend parameter formed with the start value and a set point for the trend parameter is fed to the controller, the controller acting on the CO2 removal device, the process comprising the steps of:
• detecting the current measured value concerning the expiratory CO2 concentration in the breathing gas of the patient by means of the sensor system;
• selecting the measured value which is current as the start value by means of the operating action at the system;
• and
• feeding the difference between the trend parameter and the set point for the trend parameter to the controller, the trend parameter being a quotient of the current measured value of the expiratory CO2 concentration in the breathing gas of the patient and the start value of the expiratory CO2 concentration in the breathing gas of the patient, the controller acting on the CO2 removal device, the trend parameter corresponding to a CO2 content of blood of the patient.

A process for operating a system for supporting a blood gas exchange of a patient by ventilation as well as by extracorporeal blood gas exchange by a CO2 removal, the process comprising:

• providing the system comprising:
• a medical device comprising a ventilator;
• a medical device comprising a CO2 removal device for the extracorporeal blood gas exchange;
• a controller configured to act on the CO2 removal device;
• and a sensor system configured to detect a current measured value concerning an expiratory CO2 concentration in the breathing gas of the patient, and wherein the current measured value is selectable as a start value by an operating action at the system wherein a difference of a trend parameter formed with the start value and a set point for the trend parameter is fed to the controller, the controller acting on the CO2 removal device;
• detecting a measured value concerning an expiratory CO2 concentration in the breathing gas of the patient by means of the sensor system;
• selecting the measured value which is current as the start value by means of an operating action at the system;
• and
• feeding a difference between a trend parameter and a setpoint for the trend parameter to the controller, the trend parameter being a quotient of a currently determined measured value of the expiratory CO2 concentration in the breathing gas of the patient and the start value of the expiratory CO2 concentration in the breathing gas of the patient, the controller acting on the CO2 removal device, the trend parameter corresponding to a CO2 content of blood of the patient.