UNIT DOSE DRY POWDER INHALER

摘要

A dry powder inhaler has a front section holding a unit dose cartridge over a mixing chamber. An impeller is rotatably mounted within the mixing chamber. A rear section of the inhaler includes a motor, a breath actuated switch, and pins for positioning the unit dose cartridge in the front section and driving a plunger through the unit dose cartridge, to deposit a powdered drug into the mixing chamber, as the front and rear sections are brought together. A filter wheel allows air to flow forward from the rear section into the mixing chamber, but substantially prevents stray drug powder from migrating rearwardly to the rear section. The front section is preferably disposable, while the rear section is advantageously reusable.