Patent ID: 8550067

Claim:
A delivery system comprising: a holding chamber having an input end, an output end comprising a user interface having an outlet and an interior volume of space defined between said input and output ends, said output end having a first opening communicating between said user interface and said interior volume, wherein a medication dispensing pathway is defined between said outlet of said user interface and said interior volume of said holding chamber, and separate second and third openings communicating between said user interface and an ambient environment; a first flow control member moveable between a first position, wherein said first flow control member is configured to prevent fluid flow through said first opening, and a second position, wherein said first flow control member is configured to allow fluid flow through said first opening and along said medication dispensing pathway; a second flow control member moveable between a first position, wherein said second flow control member is configured to prevent fluid flow through said second opening, and a second position, wherein said second flow control member is configured to allow fluid flow through said second opening, wherein said second flow control member comprises a flap pivotable away from an at rest Position in a direction toward said outlet of said user interface and away from said input end of said holding chamber in response to a pressure being applied thereto, wherein said flap abuts a fixed stop when in said at rest position; a third flow control member moveable between a first position, wherein said third flow control member is configured to prevent fluid flow through said third opening, and a second position, wherein said third flow control member is configured to allow fluid flow through said third opening; and wherein said first, second and third flow control members are independently moveable relative to each other.