Patent ID: 7318434

Claim:
A dry powder inhaler comprising: a first chamber for holding a dry powder and a gas; a second chamber directly connected to the first chamber by at least one passageway, formed in a wall of the first chamber, for receiving an aerosolized form of the dry powder from the first chamber and delivering the aerosolized dry powder to a user; and a vibrator coupled to the first chamber for aerosolizing the dry powder and cause the aerosolized powder to move back and forth through the passageway whereby to deliver the dry powder from the first chamber to the second chamber as an aerosolized dry powder in the form of a series of fluid vortices, and projected out of the first chamber as a train of discrete slugs of gas containing suspended dry powder, wherein the first chamber has no air inlets other than the passageway connecting the first chamber to the second chamber, and said passageway has an aspect ratio of length to cross-section of at least 0.5.