Ventilator for use with a source of gas under pressure for supplying such gas to the airway of a patient having an inlet adapted to be connected to the source of gas, and an outlet adapted to be connected to the airway of the patient. A pneumatic oscillator is connected to the inlet for supplying pulsatile...http://www.google.de/patents/US4592349?utm_source=gb-gplus-sharePatent US4592349 - Ventilator having an oscillatory inspiratory phase and method
