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.de/patents/US20040216738?utm_source=gb-gplus-sharePatent US20040216738 - Inhalation device and method
