Patent ID: 7461649

Claim:
An inhaler for introducing a drug into a user, said inhaler comprising: a first chamber containing a first compressed gas at a first pressure, said first chamber being substantially free of any drug; a second chamber in selective flow communication with said first chamber, said second chamber containing a second compressed gas at a second pressure lower than the first pressure and said second chamber being substantially free of any drug, said first and second chambers cooperating so as to yield said second pressure of said compressed gas within said second chamber; a means for delivering two different volumes of gas in successive applications from the second chamber to a storage section, said storage section storing the drug to be administered, wherein said successive volumes of gas fluidize and aerosolize said drug and produce a drug cloud; a mouthpiece coupled to said storage section, said mouthpiece adapted to receive said drug cloud and convey said drug cloud to the user; a first housing disposed within said first chamber; a second housing disposed within said second chamber having an opening therein; and a piston slidably disposed within said first and second housings.