A gas compression and delivery device for treatment of sleep disorders. The device has a motor, at least one impeller, and two air pressure chambers, each receiving air at a different pressure, one pressure applied to a patient during inspiration and one for expiration. A mask having a dual pressure...http://www.google.fr/patents/US6349724?utm_source=gb-gplus-shareBrevet US6349724 - Dual-pressure blower for positive air pressure device
Dual-pressure blower for positive air pressure device
