#$%^&*AU2017204006A120170706.pdf#####OSCILLATING POSITIVE EXPIRATORY PRESSURE DEVICE ABSTRACT A respiratory treatment device (400) comprising an inlet (412) configured to receive exhaled air into the device (400)； an outlet (413) configured to permit air to exit the device (400)； an opening positioned in an exhalation flow defined between the inlet (412) and the outlet (413)； a restrictor member (330) configured to rotate relative to the opening between a closed position where the flow of air through the opening is restricted, and an open position where the flow of air through the opening is less restricted； and, a vane (332) configured to rotate the restrictor member (330) between the closed position and the open position in response to the flow of air between the inlet (412) and the outlet (413)； wherein the restrictor member (330) and the vane (332) have a combined center of gravity positioned to bias the blocking segment to the closed position during a period of no air flow through the opening.
