Patent ID: 8677999

Claim:
A ventilation system comprising: a ventilator for supplying ventilation gas; a patient interface having a generally hollow cylindrical configuration defined by a central lengthwise axis and opposed open ends having substantially equivalent cross-sectional areas and including an open distal end with a distal opening axis coaxial with the central lengthwise axis and being in communication with a patient airway, an opposed open proximal end with a proximal opening axis coaxial with the central lengthwise axis and being in communication with ambient air, and an airflow channel between the distal end and the proximal end; a gas delivery circuit, wherein the gas delivery circuit is adapted to attach to the patient interface in a coaxial relationship to the proximal opening axis of the open proximal end without occluding the patient interface to allow ambient air to flow from outside the patient interface to the patient airway and to allow patient spontaneous breathing to flow from inside, the patient interface to outside along the central lengthwise axis and the proximal opening axis without obstruction; and wherein the ventilation gas entrains air from ambient and from the patient airway.