Patent ID: 6223746
Filing Date: 2001-05-01
Classification: A61M,B05B

Abstract:
A metered dose inhaler pump, said pump comprising:a method dose chamber having an inlet for receiving a metered dose of an active compound and an outlet for dispensing the metered dose therefrom;an inlet valve being made of a resilient material disposed in said inlet, said inlet valve opens in response to a vacuum created in the chamber and being closed upon the cessation of vacuum;an outlet valve disposed in said outlet, said outlet being closed by said outlet valve when there is vacuum in said chamber and being open in response to pressure in said chamber to dispense said metered dose therefrom;means for creating a vacuum in said chamber for drawing therein said metered dose into said chamber via the inlet whilst the outlet remains closed by said outlet valve; andmeans for pressurizing said chamber which doses said inlet via the inlet valve and opens the outlet for dispensing said metered dose from said chamber to a person's respiratory tract through said outlet.