Devices (100) for calming or mixing gases are provided. The devices (100) enable calming and/or mixing with an integrated mixing geometry, integration of sensors and actuators, and optimized conduction as well as provision of the mixed gases. The devises include one or more gas inlets, a gas outlet and a mixing system, including the integrated mixing geometry that is manufactured integrally and gas-tight in a manufacturing or joining process which is based on a formation of a form-fitting and/or force-fitting as well as gas-tight connection of plastic materials and/or metallic materials based on a printing technology or 3D printing technology.

A system of treating atelectasis is provided that includes a tracheal tube positioned within an airway of a ventilated patient and an acoustic sensor coupled to the tracheal tube. The system also includes a monitor communicatively coupled to the acoustic sensor. The monitor includes a processor configured to receive a baseline signal from the acoustic sensor. The processor is configured to provide control instructions to adjust a pressure of a gas mixture delivered to the airway through the tracheal tube. The processor is also configured to receive an updated signal from the acoustic sensor after the adjustment and identify a change in airway openness of lungs of the ventilated patient caused by the adjustment of the pressure. Further, identifying the change is based on the baseline signal and the updated signal.