Patent ID: 7913688
Filing Date: 2011-03-29
Classification: A61M

Abstract:
1. A device for delivering a drug by inhalation, comprising: a) a chamber having upstream and downstream openings; b) a drug supply unit that produces a drug vapor in a region of said chamber between said upstream and downstream openings; c) a gas-flow control valve upstream of said region that limits gas flow from a user's breath intake through said region to a selected flow rate or flow rate range, effective to condense said drug vapor to form an aerosol; d) a bypass orifice communicating with said chamber at a point of communication, said bypass orifice being configured to allow bypass gas to enter said chamber under conditions of inhalation actuated selected pressure differential across said bypass orifice, the point of communication preventing the bypass gas from significantly varying the selected flow rate or flow rate range through said region; and e) an actuation switch for causing said drug supply unit to produce said drug vapor.