The present invention relates to a single dose dry powder inhaler device with improved lung deposition, the inhaler device comprising: - a sliding mouthpiece; - a capsule chamber; - blades which are inserted into slots in the capsule chamber; - an outer body covering the capsule chamber, and; - a lower cover with an air inlet hole; wherein the capsule chamber has a recess for the insertion of a capsule, and said capsule gets dissected by the blades along its entire length.