A method and device for effective delivery of a gas such as oxygen for inhalation are described that sequentially dilute room air to the flow of gas during a respiratory cycle. A mask assembly is described that comprises an inspiratory and expiratory limb each containing a very low resistance one-way...http://www.google.fr/patents/US20040084048?utm_source=gb-gplus-shareBrevet US20040084048 - High FIO2 oxygen mask with a sequential dilution feature and filter
High FIO2 oxygen mask with a sequential dilution feature and filter
