An improved methodology and systems for delivery of breathing gas such as for the treatment of obstructive sleep apnea through application of alternating high and low level positive airway pressure within the airway of the patient with the high and low airway pressure being coordinated with the spontaneous...http://www.google.fr/patents/US5632269?utm_source=gb-gplus-shareBrevet US5632269 - Breathing gas delivery method and apparatus
