US Patent 8025051 Delivery device

A delivery device for administering particulate medicaments, such as dry powder. The delivery device comprises a body and a flow path comprising a chamber with an inlet and an outlet for the stream of air. The chamber is rotatable in relation to the body. Dislodging means are arranged in contact with the inner surface of the chamber. The dislodging means and the chamber are relatively rotatable in relation to one another, such that the inside of the chamber is cleaned by the dislodging means when the dislodging means and the chamber are rotated in relation to one another.