EP0632734B1 — Powder jet dispenser for medicament inhalation therapies

USPTO Abstract

Powder jet dispenser for medicament inhalation therapies, intended to be the drug pack container, incorporating a dose metering system, comprising turning filling means (27, 28, 29, 30, 31, 35) and a separation unit (25, 26) to fill a fix positioned dosage chamber (19) and to provide, after its filling, an air-tight separation from the medicament reservoir (36). Said dosage chamber (19) being connected to a compression chamber (5) part of a servo-assisted air compression system actuated by a manual stroke of a plunger (3) providing the compression of a spiral load spring (7), and then its release by means of a sliding control mechanism (11, 14) automatically actuated by the continuation of the stroke on the plunger (3). Said spring (7) bearing against a piston (8) which, therefore, snaps forward into said compression chamber (5) producing a jet of compressed air which reaches the dosage chamber (19), and takes the drug out to the user's mouth through a nozzle (20) provided with a check valve (22) to avoid the entrance of outside air.