Patient interface with movable frame

A patient interface comprising:

• a plenum chamber pressurisable to a therapeutic pressure of at least 6 cmH2O above ambient air pressure by a flow of air;
• a seal-forming structure connected to the plenum chamber and constructed and arranged to contact and seal against a region of the patient's face surrounding an entrance to the patient's airways such that the flow of air is delivered to at least the entrance to the patient's nares, the seal-forming structure being constructed and arranged to maintain said therapeutic pressure in the plenum chamber throughout the patient's respiratory cycle in use, and the seal-forming structure being configured to leave the patient's mouth uncovered during use;
• a positioning and stabilising structure configured to hold the seal-forming structure in a therapeutically effective position on the patient's head, the positioning and stabilising structure comprising a tie, the tie being constructed and arranged so that at least a portion of the tie overlies a region of the patient's head superior to an otobasion superior on a corresponding side of the patient's head in use;
• a frame connected to the plenum chamber to be movable towards or away from the patient, the tie of the positioning and stabilising structure being removably connected to the frame;
• an elbow assembly rotatably connected at a first end to the frame and having a swivel at a second end that is configured to be connected to an air circuit to provide a fluid connection between the plenum chamber and the air circuit for the flow of air, and the elbow assembly having a plurality of vent holes configured to allow a continuous flow of gases exhaled by the patient to pass from an interior of the plenum chamber to ambient during use, the vent holes being sized and shaped to maintain the therapeutic pressure in the plenum chamber during use;
• and
• an elastic member that extends from the frame to the plenum chamber to resiliently limit movement of the frame relative to the plenum chamber,
• wherein the frame comprises an elastic member hole and the elastic member extends from an elastic member attachment structure,
• wherein the elastic member is joined to the frame at the elastic member hole by the elastic member attachment structure, and
• wherein the elastic member is joined to the frame with an overmoulded joint.