Dry powder inhaler
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 28, 1999
Grant Date -
N/A
app pub date -
Mar 20, 1997
filing date -
Mar 20, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A dry powder inhaler has a lid pivotally attached to an inhaler housing. A medicine containing cartridge is attached to the top of the housing and includes a cartridge ring with apertures for holding dry powdered medicine. A slide-groove assembly located on the underside of the lid advances the cartridge ring to a next aperture when a user first opens, then closes the lid. A venturi air passageway assembly is contained within the housing of the dry powdered inhaler. The venturi air passageway assembly includes a tapered inlet section, a throat section, and a tapered outlet section. A pressure switch is advantageously located within the housing for actuating the mixing process within the mixing chamber. During inhalation, the pressure switch contained within the housing actuates the motor driven impeller within the mixing chamber of the inhaler when the pressure within the venturi air passageway reaches a predetermined level. The pressure at which the pressure switch closes corresponds to a specifically calibrated inhalation flow rate.
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