Abstract: An anesthesia delivery device can be coupled to a ventilation system. The device includes an inspiratory gas line having a machine end and a patient end. The machine end can be fluidly coupled to the ventilation system, and the patient end can be received within the naris of the patient. A face mask having a dome portion can cover the patient's nose without covering the patient's mouth and defines an inside air space between the patient's nose and the dome portion, and an outside air space exterior of the dome portion. A vent allows gas to pass between the inside and outside air spaces. An exhaust port can be fluidly coupled to the exhaust gas output. The exhaust port and vent can cooperatively exert a negative pressure on the outside air space for preventing inspiratory gas from entering the outside air space.

Abstract: In accordance with the present invention an anesthesia delivery device is disclosed for use on a patient having a mouth and a nose having a naris. The delivery device is capable of being coupled to a ventilation system having an inspiratory gas input for delivering gas to the patient and an exhaust gas output for delivering gas from a patient to the ventilation system. The anesthesia device includes an inspiratory gas line having a machine end and a patient end. The machine end is capable of being fluidly coupled to the inspiratory gas input of the ventilation system, and the patient end is configured for being received within the naris of the patient for delivering inspiratory gas to the naris of the patient. The device also includes a face mask having a dome portion sized to cover the patient's nose without covering the patient's mouth. The dome portion defines an inside air space between the patient's nose and the dome portion, and an outside air space exterior of the dome portion.