Patent ID: 11931513
Assignee: RESMED PTY LTD
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A patient interface configured for sealed delivery of a supply of pressurized, breathable gas at a continuously positive pressure with respect to ambient air pressure to a patient's nares, the patient interface being configured to maintain a therapeutic pressure in a range of about 4 cmH2O to about 30 cmH2O above ambient air pressure in use, throughout the patient's respiratory cycle, while the patient is sleeping, to ameliorate sleep disordered breathing, the patient interface comprising:
a frame;
a seal-forming structure connected to the frame and the seal-forming structure including an opening formed in the seal-forming structure and configured to deliver the supply of pressurized, breathable gas to the patient's airway, the seal-forming structure including:
a first region positioned proximal to the opening on each lateral side of the opening, the first region being configured to contact the patient's nose;
a second region positioned adjacent to and laterally outward of each first region, the second region being thicker than the adjacent first region; and
a third region positioned adjacent to and laterally outward of each second region, the third region having a different thickness relative to the adjacent second region;
wherein the seal-forming structure has a curved shape from each first region, through the adjacent second region, and to the adjacent third region, an apex of each curved shape being located in each second region;

a gas washout vent including at least one vent hole and being configured to allow a flow of patient exhaled CO2 to be discharged to ambient from the patient interface; and
a positioning and stabilising structure that includes a strap and is connected to the frame, the positioning and stabilising structure being configured to maintain the seal-forming structure in sealing contact with patient's face while maintaining the therapeutic pressure at the patient's nares,
wherein a first portion of the seal-forming structure is configured to be positioned proximal to the patient's upper lip in use, a second portion of the seal-forming structure is positioned opposite the first portion across the opening, and the second portion of the seal-forming structure is configured to contact the underside of the patient's nose proximal to the pronasale in use.