Metered dose valves and dispensers
Assignee3M Innovative Properties Company
InventorsPhilip A. Jinks, Graham R. Purkins, Peter D. Hodson, Paul E. Hansen
Life of this patent
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Abstract
A metered dose valve for use in a pressurized metered dose dispenser for dispensing a metered dose of an aerosol formulation comprising particles of a medicament suspended in liquefied propellant, optionally in combination with one or more excipients, the valve comprising a metering chamber and at least one porous, fluid permeable, particulate semi-permeable body, the at least one porous body being positioned within a region of the interior conduit of the valve, for example within the metering chamber, or a pre-metering chamber and/or an internal channel upstream of the metering chamber.
Claims17
A metered dose valve comprising an interior conduit, a metering chamber and at least one porous, fluid permeable, particulate semi-permeable body, said at least one porous body being positioned within a region of the interior conduit of the valve to hold medicament particles substantially uniformly dispersed within a volume of the porous body;
- wherein the porous body is permeable to at least particulates having a particle size of 250 microns or less and the porous body is impermeable to at least particulates having a particle size of 2 mm or more, and wherein the valve is a medicament-dispensing pressurized meter dose dispenser valve that dispenses a metered dose of an aerosol formulation comprising the medicament particles suspended in liquefied propellant.
A valve according to claim-1, wherein the porous body has a relative density of 50% or less.
Dependencies are inferred from the claim text.