Patent ID: 7228860

Claim:
A powder inhaler for administering powder by inhalation, comprising: an inhaler body; a dosing unit for providing a dose of powder; a flow path downstream of the dosing unit which is defined by a plurality of surfaces through which a stream of air entraining the dose powder is in use drawn on inhalation by a user; and a mouthpiece which is attached to inhaler body; characterized in that at least part of the mouthpiece is rotatable relative to the inhaler body, in that the mouthpiece and the inhaler body include one or both of first and second relatively movable components which include cooperating surfaces and are resiliently biased towards one another and in that at least one of the cooperating surfaces includes one or more discontinuities such that on rotation of the at least part of the mouthpiece relative to the inhaler body the first and second components are moved relative to one another and vibrations are created in the inhaler such as to dislodge powder accumulated on at least one of the surfaces of the flow path.