#$%^&*AU2016256805A120161201.pdf#####OSCILLATING POSITIVE EXPIRATORY PRESSURE DEVICE ABSTRACT A respiratory treatment device (700) comprising: a housing (701) enclosing at least one chamber (705)； a chamber inlet (711) configured to receive air into the at least one chamber (705)； at least one chamber outlet (703) configured to permit air to exit the at least one chamber (705)； a flow path (704) defined between the chamber inlet (711) and the at least one chamber outlet (703)； an orifice (707) positioned in the at least one chamber along the flow path such that the flow path passes through the orifice (707), and, a vane (711) positioned adjacent the orifice (707), the vane (711) being configured to rotate in response to the flow of air through the orifice (707)； wherein the vane (711) is biased by an elastic band toward a position where a central portion of the vane (711) is not aligned with the orifice (707).
