Patent ID: 8074642
Filing Date: 2011-12-13
Classification: A61M,Y10T

Abstract:
1. A delivery system comprising: a pressurized metered dose inhaler; a conduit comprising a chamber having an interior volume of space formed within said chamber and an opening communicating with said interior volume at a downstream end of said chamber, wherein said opening defines at least in part a flow path and wherein said opening has a cross sectional area, and wherein said pressurized metered dose inhaler is in fluid communication with said interior volume of said chamber; a viewing port connected to said conduit, wherein said viewing port allows visualization of an internal space defined at least in part by said viewing port; and a flow indicator positioned within said internal space of said viewing port and visible through said viewing port, wherein said flow indicator is enclosed within said viewing port, wherein said flow indicator is positioned substantially outside of said flow path, said flow indicator comprising a moveable portion with a surface in fluid communication with said flow path, wherein said moveable portion is moveable from an at rest position to an inhalation position in response to an inhalation pressure applied thereto, wherein said movable portion is biased toward said at-rest position in the absence of the inhalation pressure, and wherein said surface of said moveable portion has a surface area less than said cross sectional area of said opening.