Patent ID: 8210170

Claim:
Manually actuable inhaler ( 1 ) for pulverulent substances, in particular medicinal substances, in which inhaler, during the manual actuation, a defined discharge quantity ( 20 ′) from a substance storage quantity ( 20 ) is apportioned out in a metering chamber (D) of the inhaler upstream of a discharge passage ( 21 ), for the purpose of providing an airborne discharge from a mouthpiece opening ( 14 ) of the inhaler at an end (b) of the discharge passage ( 21 ), wherein the inhaler further comprises a piston ( 8 ) which generates the discharge airstream, together with a cavity ( 17 ) in a body portion ( 15 ) of the piston, the cavity forming a substance storage chamber (SV) and the metering chamber (D); wherein a reduced pressure, which is generated during a return stroke of the piston ( 8 ) opens the metering chamber (D) toward the substance storage quantity ( 20 ), the base of the metering chamber (D) is formed by an air-permeable membrane, and the metering chamber (D), in a basic position of the piston body portion ( 15 ), is open toward the substance storage chamber (SV), wherein the metering chamber (D) is partially formed from a recess ( 45 ) in a sleeve of the piston and partially comprises a valve cone ( 65 ) which touches down in a sealing manner onto an edge ( 50 ) of the recess ( 45 ) in the metering chamber (D) and narrows in the discharge direction.