Dry powder inhaler

Details Dry powder inhaler Dry powder inhaler

1997-03-20

1999-12-28

Weiss, John G.

Surgery

Respiratory method or device

Means for mixing treating agent with respiratory gas

12820321, A61M 1500, A61M 1508

Patent

active

060067470

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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*English translation of Sections 54 and 57 of title page of EP 0 485 819 A1 .

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