Compact oronasal patient interface

A nozzle for sealingly engaging with a patient's nose in use, comprising:

• an inner wall;
• and
• one or more outer walls that surround the inner wall,
• wherein each of the inner and outer walls include an outer surface having a concave shape before use,
• wherein the inner wall and one or more outer walls have adjacent surfaces that face one another and are spaced apart from one another,
• wherein the inner wall is adapted to extend inside the patient's nose and one of the outer walls is adapted to seal around the patient's nare in use, and
• wherein the concave outer surfaces of the inner and outer walls are co-extensive over at least a portion of a length of the inner wall.

A breathing arrangement for use between a patient and a structure to deliver a breathable gas to the patient, the breathing arrangement comprising:

• a pair of nozzles structured to sealingly engage with a patient's nose in use,
• each of said nozzles including an inner wall and one or more outer walls that surround the inner wall, the inner wall and one or more outer walls having adjacent surfaces that face one another and are spaced apart from one another,
• wherein the inner wall and one or more outer walls are integrally formed in one piece from the same material,
• wherein each of the inner and outer walls includes an outer surface having a concave shape before use, and
• wherein the concave outer surfaces of the inner and outer walls are co-extensive over at least a portion of a length of the inner wall.

A breathing arrangement for use between a patient and a structure to deliver a breathable gas to the patient, the breathing arrangement comprising:

• a pair of nozzles structured to sealingly engage with a patient's nose in use,
• each of said nozzles including an inner wall and one or more outer walls that surround the inner wall,
• wherein each outer wall includes a free end that is spaced by an annular gap from and unattached to a free end of the inner wall,
• wherein at least one of the outer walls includes a membrane that is thinner than the inner wall, and
• wherein the outer wall includes an outer surface having a concave shape before use that tapers from its base towards a distal end whereby a width of the distal end is less than a width of the base, the concave shape extending along a majority of the outer surface.

A breathing arrangement for use between a patient and a structure to deliver a breathable gas to the patient, the breathing arrangement comprising:

• a pair of nozzles structured to sealingly engage with a patient's nose in use,
• each of said nozzles including a nozzle portion and a conduit adapted to interconnect the nozzle portion with a support structure, the nozzle portion and the conduit being integrally formed in one piece from the same material,
• each nozzle portion including an inner wall and an outer wall that surrounds the inner wall, the inner wall and the outer wall having adjacent surfaces that face one another and are spaced apart from one another by an annular gap at least before use,
• wherein each of the inner and outer walls includes an outer surface having a concave shape before use,
• wherein the inner wall is generally nested within the outer wall such that the concave outer surfaces of the inner and outer walls are co-extensive over at least a portion of the length of the inner wall.

A breathing arrangement for use between a patient and a structure to deliver a breathable gas to the patient, the breathing arrangement comprising:

• a pair of nozzles structured to sealingly engage with a patient's nose in use,
• each of said nozzles including a nozzle portion and a conduit adapted to interconnect the nozzle portion with a support structure,
• each nozzle portion including an inner wall and an outer wall that surrounds the inner wall, the inner wall and the outer wall having adjacent surfaces that face one another and are spaced apart from one another by an annular gap at least before use,
• wherein each of the inner and outer walls includes an outer surface having a concave shape before use,
• wherein the conduit includes one end adapted to connect to the support structure and an opposite end connected to a base of the nozzle portion, and the base of the nozzle portion is closed by a joint between the inner and outer walls.

A breathing arrangement for use between a patient and a structure to deliver a breathable gas to the patient, the breathing arrangement comprising:

• a pair of nozzles structured to sealingly engage with a patient's nose in use,
• each of said nozzles including a nozzle portion,
• each nozzle portion including an inner wall and an outer wall that surrounds the inner wall, the inner wall and the outer wall having adjacent surfaces that face one another and are spaced apart from one another by an annular gap at least before use,
• wherein each of the inner and outer walls includes an outer surface having a concave shape before use,
• wherein the nozzle portion includes a base closed by a joint between the inner and outer walls, and each of the inner and outer walls is generally cone-shaped and includes the concave outer surface such that each nozzle portion tapers from the base towards its distal end whereby a width of the distal end is less than a width of the base.