Method and device for automatic tube transposition detection in a ventilator or anesthesia device

A ventilator or anesthesia device comprising:

• a gas delivery unit;
• at least one pressure sensor or flow sensor;
• an inspiratory fluidic port;
• an expiratory fluidic port;
• a fluid measuring port coupled with the at least one pressure sensor or flow sensor, wherein the inspiratory fluidic port and the expiratory fluidic port are coupleable to a Y-piece via ventilation tubes to provide a breathing circuit and wherein the fluid measuring port is coupleable to the Y-piece via a sample gas line;
• a control unit configured to:
• create a reference state;
• record a measured value as a reference value during the reference state;
• end the reference state after the recording of the reference value;
• activate the gas delivery unit after the ending of the reference state including create a buildup of pressure in the breathing circuit with the gas delivery unit;
• determine a built up pressure comparison measured value with the at least one pressure sensor or flow sensor in the form of a pressure measured value or flow value relating to the buildup of pressure;
• compare the built up pressure comparison measured value with a predefined or predefinable expected value, wherein a built up pressure deviation of the built up pressure comparison measured value from the reference value relative to the predefined or predefinable expected value is monitored based on the comparison;
• issue a warning message based on the built up pressure deviation and the expected value;
• cause a drop in pressure in the breathing circuit after the ending of the reference state;
• record a dropped pressure comparison measured value relating to the drop in pressure;
• compare the dropped pressure comparison measured value with a predefined or predefinable further expected value, wherein a dropped pressure deviation of the dropped pressure comparison measured value from the reference value relative to the predefined or predefinable further expected value is monitored based on the comparison;
• and
• issue a further warning message based on the dropped pressure deviation and the further expected value.

A method for automatic detection of a fluidic connection state, the method comprising the steps of:

• providing a ventilator or anesthesia device comprising a gas delivery unit, at least one pressure sensor or flow sensor, a control unit, an inspiratory fluidic port, an expiratory fluidic port and a fluid measuring port, which is coupled with the at least one pressure sensor or flow sensor, wherein the inspiratory fluidic port and the expiratory fluidic port are connectable with ventilation tubes which are connectable with a Y-piece, to form a breathing circuit with the ventilator or anesthesia device and the fluid measuring port can be coupled to the Y-piece by a sample gas line;
• with the control unit initiating a reference state;
• with the control unit recording a measured value as a reference value during the reference state;
• with the control unit ending the reference state after the recording of the reference value;
• with the control unit activating the gas delivery unit, after the ending of the reference state, including creating a buildup of pressure in the breathing circuit with the gas delivery unit;
• with the control unit determining a comparison measured value with the at least one pressure sensor or flow sensor in the form of a pressure measured value or flow measured value after ending the reference state and after the build up of pressure in the breathing circuit;
• with the control unit determining a difference between the comparison measured value and the reference value;
• with the control unit comparing the difference with a predefined or predefinable expected value, wherein a deviation of the comparison measured value from the reference value relative to the predefined or predefinable expected value is monitored based on the comparison;
• with the control unit issuing a warning message depending on a result of the comparison;
• with the control unit causing a drop in pressure in the breathing circuit after the buildup of pressure in the breathing circuit and after the recording of the comparison measured value;
• with the control unit recording a further comparison measured value following the drop in pressure;
• with the control unit determining a further difference between the further comparison measured value and the reference value;
• with the control unit comparing the further difference with a further predefined or predefinable expected value, wherein a deviation of the further comparison measured value from the reference value relative to a further expected value monitored based on the comparison;
• and
• with the control unit issuing a further warning message depending on a result of the comparison of the further difference.