Patent ID: 6904908
Filing Date: 2005-06-14
Classification: A61M,Y10T

Abstract:
1. A delivery system comprising: a chamber that contains a substance in an interior volume of space formed within said chamber; an opening that receives said substance located in said volume of space and introduces said substance to a downstream path upon which said substance primarily flows along; an interface that receives said substance from said opening, said interface comprising a viewing port that substantially prevents non-ambient atmosphere gases and substances from escaping therefrom and allows visualization of an internal portion of said interface; and a flow indicator that is positioned within said interface so as to be viewed via said viewing port and is positioned so as to not substantially interfere with a flow of said substance along said path, said flow indicator moveable between at least an at-rest position and an inhalation position, wherein one or both of said flow indicator and said interface prevent entrainment of ambient air into said flow of said substance along said path when said flow indicator is in said inhalation position.