Inhalation device and associated method for facilitating inhalation by a patient of powder medicaments contained in a receptacle. The inhalation device has a chamber for receiving the receptacle. A ring is circumferentially coupled to an inner surface of the chamber to achieve a higher reproducible emitted...http://www.google.es/patents/US7146978?utm_source=gb-gplus-sharePatente US7146978 - Inhalation device and method
