Inhalation device for active powder or liquid medicament - in which active medicament is sucked into a chamber by movement of a piston

摘要

Active substance (from 22) for inhalation is sucked into a chamber (10) by movement of a chamber wall (12) between a position in which the wall provides a minimum volume, and a position in which it provides a maximum volume, for the chamber. The wall is biased (by 16) to its maximum volume position and the dispersed active substance is sucked from the chamber by the patient (29) through mouthpiece (24).