Patient interface device

A patient interface device for delivering pressurized breathable gas to an entrance of a patient's airways during sleep, at a pressure elevated above atmospheric pressure in a range of 4 to 20 cm H2O, the patient interface device comprising:

• a frame having a main body and a side frame member provided on each lateral side of the main body, each side frame member including a first connector portion, said frame having a central aperture;
• a cushion repeatedly attachable to and detachable from the frame, the cushion being adapted to deliver said pressurized breathable gas to the patient's airways;
• an elbow rotatably connected to the frame at the aperture;
• and
• a headgear assembly removably attachable to the frame, the headgear assembly having a second connector portion adapted to be removably coupled with the first connector portion,
• wherein one of the first connector portion and the second connector portion includes at least one tooth and the other of the first connector portion and the second connector portion includes a plurality of teeth configured for rotationally locking engagement with the at least one tooth in a plurality of different rotationally locked positions in which the first and second connector portions may not rotate relative to one another, such that the headgear assembly is rotationally adjustable with respect to the frame.

A patient interface device for delivering pressurized breathable gas to an entrance of a patient's airways during sleep, at a pressure elevated above atmospheric pressure, the patient interface device comprising:

• a frame having a central aperture;
• a cushion repeatedly attachable to and detachable from the frame, the cushion being adapted to deliver said pressurized breathable gas to the patient's airways;
• an elbow rotatably connected to the frame at the aperture, the elbow including a plurality of openings to allow for escape of CO2 gas exhaled by the patient;
• a headgear assembly having at least one flexible strap and a yoke attached to the strap, the yoke being removably attachable to the frame;
• and
• a toothed adjustment arrangement to allow rotational locking engagement between the yoke and the frame in a plurality of different rotationally locked positions, such that the cushion is rotationally adjustable relative to the patient's face in use.