Patent ID: 11918741
Assignee: RESMED PTY LTD
Field: Medical technology (Instruments)
Classification: CPC A  G  Y | IPC A  G

Claim 19:
20. A patient interface comprising:
a plenum chamber pressurisable to a therapeutic pressure of at least 4 cmH2O greater than ambient air pressure, said plenum chamber including a plenum chamber port sized and structured to receive a flow of air at the therapeutic pressure for breathing by a patient;
a seal-forming structure constructed and arranged to contact and seal against a region of the patient's face surrounding an entrance to the patient's airways, said seal-forming structure having a hole therein such that the flow of air at said therapeutic pressure is delivered to at least the patient's nares, the seal-forming structure constructed and arranged to maintain said therapeutic pressure in the plenum chamber throughout the patient's respiratory cycle in 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 the patient's corresponding otobasion superior in use;
a vent structure comprising a plurality of vent holes configured to allow a continuous flow of gases exhaled by the patient from an interior of the plenum chamber to ambient, the plurality of vent holes being sized and shaped to maintain the therapeutic pressure in the plenum chamber in use; and
the plenum chamber insert of claim 1,
wherein the patient interface is configured to allow the patient to breathe from ambient through their mouth in the absence of a flow of pressurised air through the plenum chamber port, or the patient interface is configured to leave the patient's mouth uncovered.