Oscillating positive expiratory pressure device

A respiratory treatment device comprising:

• an inlet configured to receive exhaled air into the device;
• an outlet configured to permit air to exit the device;
• an opening positioned in an exhalation flow path defined between the inlet and the outlet,
• a restrictor member configured to move relative to the opening between a closed position where the flow of air along the exhalation flow path is restricted, and an open position where the flow of air along the exhalation flow path is less restricted;
• a vane configured to move the restrictor member between the closed position and the open position in response to the flow of air along the exhalation flow path;
• and,
• an orifice positioned adjacent the vane, the exhalation flow path passing through the orifice, the orifice having a cross sectional area less than a cross sectional area of the inlet;
• wherein the restrictor member and the vane have a combined center of gravity positioned to bias the restrictor member to the closed position during a period of no air flow along the exhalation flow path.

A respiratory treatment device comprising:

• an inlet configured to receive exhaled air into the device;
• an outlet configured to permit air to exit the device;
• an opening positioned in an exhalation flow path defined between the inlet and the outlet,
• a restrictor member configured to move relative to the opening between a closed position where a flow of air along the exhalation flow path is restricted, and an open position where the flow of air along the exhalation flow path is less restricted;
• a vane configured to move the restrictor member between the closed position and the open position in response to the flow of air along the exhalation flow path, the vane having an axis of rotation;
• and,
• an orifice positioned adjacent the vane, the exhalation flow path passing through the orifice, wherein a direction of the flow of air through the orifice is aligned with the axis of rotation of the vane;
• wherein the restrictor member and the vane have a combined center of gravity positioned to bias the restrictor member to the closed position during a period of no air flow along the exhalation flow path.