Patent ID: 7146978

Claim:
A method for dispensing powder by inhalation, comprising: providing a powder inhalation device, the device comprising a first casing portion, a cylindrical chamber, defined by a straight wall of circular cross-section, coupled to said first casing portion, said chamber having a proximal end and a distal end and configured to receive a receptacle therein, said chamber comprising a ring circumferentially coupled to an inner surface of said chamber, wherein an inner diameter of said ring is less than an inner diameter of said chamber whereby emitted dose from said powder inhalation device is improved compared to a device with no ring, and a second casing portion removably coupled to said first casing portion, said second casing portion comprising an inhalation portion disposed at the proximal end of said chamber when said first and said second casing portions are coupled, said inhalation portion comprising a hemispheric region defining a plurality of apertures configured to emit powder therethrough; puncturing the receptacle to disperse powder in said chamber; and inhaling the powder through said inhalation portion.