Patent ID: 6182657
Filing Date: 2001-02-06
Classification: A61M,Y10T

Abstract:
A controllable flow generator for the supply of breathable pressurized gas, the flow generator including:a blower receiving gas from an inlet, pressurizing the received gas and providing it to an outlet as outlet gas; anda control mechanism having a substantially circular gas plenum chamber with a rotatable substantially D-shaped control member plate therein, the chamber having an entrance for receiving the outlet gas, an exiting port from which the outlet gas is supplied and a vent in controlled gas communication with atmosphere,wherein, in an inspiratory mode of operation, the control mechanism is operable to controllably direct the outlet gas to a desired degree to the exiting port by rotating the plate to increase or decrease the open area of the entrance whilst maintaining the exiting port fully open and the vent fully closed, andfurther wherein, in an expiratory mode of operation, the control mechanism is operable to controllably direct gas entering the exiting port to a desired degree to the vent by rotating the plate to increase or decrease the open area of the vent whilst maintaining the exiting port fully open and the entrance fully closed.