Patent ID: 8205613

Claim:
Dosing device ( 4 ) for an inhaler ( 1 ) for dosing a small amount of a powdered formulation ( 2 ), comprising a reservoir ( 3 ) for the formulation ( 2 ) and a dosing chamber ( 7 ) for receiving the formulation ( 2 ) supplied from the reservoir ( 3 ), wherein the dosing chamber ( 7 ) has a wall ( 8 ) that is gas-permeable at least in part, so that the formulation ( 2 ) can be taken into the dosing chamber ( 7 ) by underpressure and can be expelled from the dosing chamber ( 7 ) by overpressure, characterised in that the dosing device ( 4 ) comprises a pump device ( 11 ) for alternately generating the underpressure for taking the formulation ( 2 ) into the dosing chamber ( 7 ) and the overpressure for expelling the formulation ( 2 ) from the dosing chamber ( 7 ).