| abstract |
An inhaler housing ( 14 ) for an inhaler ( 10 ) for inhaling inhalable substances, the inhaler having: a body ( 14 ) and a dose counter ( 24 ) with a return spring ( 28 ), wherein a distinct guide surface ( 162 ) is provided for guiding the end of the return spring into a recess ( 152 ), the distinct guide surface being wider than an entrance mouth ( 160 ) of the recess, a dose counter chamber ( 22 ) being provided which is separated from a tubular interior space ( 182 ) of the inhaler by a barrier ( 180 ), the barrier including a stepped upper wall area ( 184 ) including at least three steps ( 186, 188, 190, 192 ) at different levels, the inhaler having a valve stem block ( 62 ) having an inner bore and a valve stem block having a seal ( 224 ) in the inner bore with a second diameter which is smaller than a first diameter of the inner bore, the inhaler having a canister ( 150 ) being adapted to move during operation between 1 and 4 mm, a drive being arranged to apply a firing force of between 15 N and 60 N of force to the canister at a position of the canister relative to a valve stem ( 54 ) at which the canister fires. |