Inhalation device

A dry powder inhaler for dispensing powder from a spherocylindrical capsule, comprising:

• a tray comprising a slitting chamber configured to accommodate a spherocylindrical capsule;
• a main body configured to receive the tray;
• the tray and main body configured so that they can be moved between an open position where a user can place a capsule in the slitting chamber, and a closed position;
• the tray and main body further configured so that as the tray and main body are moved from the open to the closed position, a capsule in the slitting chamber is squeezed across its length to an oval cross-sectional shape by converging walls;
• the tray further comprising at least one blade adapted to slit or pierce a capsule located in the tray when the tray is at or close to the closed position, the blade configured to engage the capsule surface at a position having a radius of curvature smaller than that of the capsule before the capsule was squeezed.