A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
A61M 11/00 (2006.01) B05B 17/06 (2006.01)
Patent
CA 2078089
An improved aerosol chamber for an ultrasonic nebulizer which prevents relatively large medicament droplets from being inhaled by a patient. The chamber has a housing formed from a polycarbonate resin and is generally cylindrically shaped with a spherical top surface. The chamber includes an air inlet formed in the top surface and an aerosol outlet formed in a side surface. A centrally located mist tube extends coaxial from the air intake downwardly past the aerosol outlet. A longitudinally extending slot is formed in the mist tube facing the side surface of the housing diametrically opposite the outlet. The slot extends from a lower edge of the tube upwardly toward the air intake. A geyser baffle is disposed at an angle within the mist tube above the slot to deflect larger droplets away from the slot. The baffle includes an upper edge spaced from an adjacent inner surface of the mist tube to define a relatively small gap to allow inlet air to flow through the mist tube. The air flow entrains nebulized medicament droplets, flows through the slot and through an annular space between the mist tube and the housing to the outlet. The annular space creates a cyclone effect which causes larger droplets to condense on the interior walls of the housing.
Fetherstonhaugh & Co.
Sunrise Medical Hhg Inc.
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