Patent ID: 8251063

Claim:
A medical aerosol delivery device, comprising: a housing having a first opening and a second opening and defining a fluid passage between the first and second openings; the housing comprising a pressurized medical aerosol canister actuator having a canister receptacle disposed within the fluid passage and having a valve chamber comprising a fine bore nozzle positioned to direct atomized medicament toward the first opening; the fluid passage including an annular portion bypassing the canister receptacle; the housing comprising a movable closure member for selectively obstructing the fluid passage; the closure member cooperating with the actuator for releasing a metered dose of medicament; wherein: the second opening is defined in the closure member; the closure member has an inward annular shoulder; and the closure member is movable toward and away from the first opening; so that when a pressurized medical aerosol canister is received in the canister receptacle: when the closure member is positioned with its inward annular shoulder spaced from a base of the canister, fluid can flow between the first opening and the second opening by flowing around the canister in the annular portion of the fluid passage; movement of the closure member toward the first opening causes the base of the canister to engage the inward annular shoulder and cooperate with the inward annular shoulder to obstruct the fluid passage; and further movement of the closure member toward the first opening causes the inward annular shoulder to engage the base of the canister and press the canister against the valve chamber to release a metered dose of medicament.