Respiratory interface with elbow

An apparatus for delivery of pressurized gas to a user for treatment of sleep disorders, comprising:

• an interface configured to create a seal with a face of the user and deliver a flow of the pressurized gas to the user's airways, the interface having a passage that permits the flow of pressurized gas to enter the interface by moving in a first direction through the passage;
• a connecting tube coupled to the interface and configured to deliver the flow of the pressurized gas to the passage;
• a substantially L-shaped elbow that couples the connecting tube to the interface and delivers the flow of the pressurized gas to the passage, wherein the elbow is configured such that it can be disconnected from the interface,
• a first swivel joint that permits relative rotation between the elbow and the interface about a first swivel axis, and
• a second swivel joint that permits relative rotation between the elbow and the connecting tube about a second swivel axis;
• and
• a vent arrangement defined by an annular portion of the elbow, wherein the vent arrangement is configured to expel expired gases from the interface in a second direction, the annular portion of the elbow having a tapered surface in the second direction from a first diameter to a second diameter, the first diameter and the second diameter defined by the tapered surface and spaced from one another in a longitudinal direction of the annular portion with the first diameter being downstream from the second diameter relative to the flow of the pressurized gas from the connecting tube towards the interface, wherein the first diameter is greater than the second diameter, and wherein the tapered surface defines a plurality of elongate vent paths extending in the second direction between the first and second diameters, a length extending between the first diameter and the second diameter;
• and the plurality of elongate vent paths positioned along the length extending between the first and second diameters;
• wherein the first diameter is at one of the first swivel joint and the second swivel joint and the second diameter is offset from the one of the first swivel joint and the second swivel joint;
• wherein the first diameter is a first end of the tapered surface and the second diameter is a second end of the tapered surface, the tapered surface having sufficient rigidity to maintain an orientation of the first end relative to the second end;
• wherein the plurality of elongate vents are upstream from at least one of the first swivel joint and the second swivel joint and the tapered surface is directly physically connected at one end with and adjacent to one of the first swivel joint and the second swivel joint;
• wherein the plurality of elongate vent paths are disposed around both a first half and a second half of the tapered surface.