Multiple dosage powder inhaler - has acceleration channel and dwell chamber for uniformly high drug dispersion

摘要

A powder inhaler has a drug supply container (3), (partially) closed at its bottom by a rotatable or displaceable, hand-operated dosing plate (4) for repetitive delivery of a predetermined reproducible drug quantity form the container (3), and a dispersing chamber (12) which precedes an inhalation mouthpiece (14). The novelty is that (a) the dosing plate (4) has drug-holding recesses (5); (b) an acceleration channel (8), located upstream of the dispersing chamber (12), partially overlaps the dosing plate (4) and discharges tangentially into a cylindrical dwell chamber (9); and (c) the dwell chamber (9) is connected via a smaller diameter outlet (10), to a cylindrical discharge chamber (11) to which the dispersing chamber (12) is joined tangentially. USE/ADVANTAGE - The inhaler provides good drug dispersion even at low inhalation flows and maintains uniformly high dispersion at increased inhalation flows. Additionally, exhalation into the inhaler has no negative effects on dosing precision and device hygiene.