Patent ID: 8567394

Claim:
An inhalation device for powder drugs comprising: at least one storage chamber for accommodating a plurality of drug powder doses and a dosing device which includes at least one dosing slider which is movable approximately with a translatory movement in a dosing slider passage at least from a filling position into an emptying position; a device for inhalation-triggered automatic movement of the dosing slider from its filling position into the emptying position; a return device for automatic movement of the dosing slider back into the filling position; said at least one storage chamber has at least one outlet opening through which the powder drug can issue under the influence of the force of gravity and the dosing slider has at least one dosing cavity, wherein the dosing cavity in the filling position is under the outlet opening and the dosing slider is movable out of its filling position into the emptying position approximately transversely with respect to the outflow direction of the drug powder from the outlet opening of the at least one storage chamber; a mouthpiece having an inhalation opening and an air passage which is in flow communication with the mouthpiece and through which a patient can suck an airflow for inhalation, wherein the dosing cavity in the emptying position of the dosing slider is in the air passage; and a trigger device arranged in the air passage for signalling when a predetermined minimum airflow in the air passage is exceeded, the trigger device comprising a pivotably mounted, directly or indirectly spring-loaded flap arranged in the air passage and the air passage in the region of the flap is of a cross-sectional area which is large in relation to the inhalation opening, the flap coupled to a thrust rod which is operatively connected to the device for inhalation-triggered automatic movement of the dosing slider in such a way that the device for inhalation-triggered automatic movement of the dosing slider is held in a biased position by the thrust rod when the flap is in its rest position and the thrust rod releases the device for inhalation-triggered automatic movement of the dosing slider when the flap is deflected out of its rest position at least by a predetermined amount, wherein the coupling between the flap and the thrust rod is formed by way of a toothed ring segment on the flap and a portion on the thrust rod, which is in the form of a rack.