A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
A61M 15/00 (2006.01)
Patent
CA 2243175
A metered dose inhaler for use with a pressurized aerosol canister includes a housing defining a conduit with a mouthpiece, and an actuator with a nozzle discharge orifice arranged to discharge aerosol into the conduit. An air tube is arranged within the conduit with an inlet of the air tube formed in the conduit wall and an outlet of the air tube in opposing relationship with the nozzle orifice. Inhalation through the mouthpiece causes air to be drawn into the inlet and flow out of the outlet of the air tube to form an air jet which impinges on an oppositely moving aerosol plume from the orifice. Auxiliary air inlets in the closed end of the conduit provide a boundary layer flow along the inner wall of the conduit. Vortex generators on the inner wall of the conduit add vorticity and turbulence to the boundary layer flow. Automatic actuation of the canister responsive to the patient's inhalation is achieved by a canister trigger connected to a movable piston assembly forming a wall of a variable-volume chamber in fluid communication with a venturi in the air tube. Air drawn through the venturi by the user's breath causes evacuation of air from the chamber, thereby moving the piston assembly and trigger to cause actuation of the canister.
Armer Thomas Alex
Evans Bryce Burwick
Mohsen Nahed Mohsen
Pavkov Richard Matthew
Sudhalkar Atul M.
Aeroquip-Vickers Inc.
Macrae & Co.
Systemic Pulmonary Delivery Ltd.
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