A BREATH ACTUATED DRY POWDER INHALER

摘要

A breath actuated dry powder inhaler with a single air circulation chamber for de-agglomeration of entrained powdered medicament using the energy of the inspiratory air stream. The chamber has a substantially polygonal sidewall, a plurality of air supply channels entering the chamber substantially tangentially to its sidewall. A powder channel extends through a powder dose supply region of the inhaler tangentially into the chamber. An air outlet axially extends from a discharge and connects to a discharge channel that extends to a mouthpiece. The polygonal sidewall comprises at least six straight line segments, each straight line segments being spaced at the same first distance from an adjacent one forming the plurality of air supply channels. The air supply channels have the same width. The powder channel is defined by two straight line segments which are spaced from each other at a second dis tance which is larger than the first distance.

主权项

1. A breath actuated dry powder inhaler, said inhaler comprising a substantially planar housing built up of a stack of substantially planar elements, said planar elements including a bottom plate, an intermediate plate and a top plate, said planar elements being parallel to each other, at least one planar element being provided with projections and an opening, that in the stack form a substantially disc shaped air circulation chamber for de-agglomeration of entrained powdered medicament using the energy of the inspiratory air stream, a plurality of air supply channels, an air supply region for a powder flow and a discharge channel of the inhaler, the chamber having a substantially polygonal sidewall extending about a central axis between top and bottom walls of the chamber, the central axis extending transversely to the bottom plate, the height of the chamber being smaller than its diameter, the plurality of air supply channels being disposed about the circumference of the chamber, which channels extend from an air inlet and which channels enter the chamber substantially tangentially to its sidewall, the housing comprising a powder channel extending through a powder dose supply region of the inhaler to the chamber, which powder channel enters the chamber substantially tangentially to its sidewall, the chamber further comprising an air outlet axially extending from a discharge opening and connecting to a discharge channel that extends to a mouthpiece, wherein the discharge channel connects substantially transversely to the air outlet of the chamber, characterized in that the inhaler comprises a single air circulation chamber and in that the polygonal sidewall comprises at least six straight line segments or sides, each straight line segments being spaced at the same first distance from an adjacent one forming the plurality of air supply channels, the air supply channels having the same width and being regularly disposed about the circumference of the chamber, the powder channel being defined by two straight line segments which are spaced from each other at a second distance which is larger than the first distance.