Nasal assembly
A nasal assembly for delivering breathable gas to a patient includes a frame having an integrally formed first connector portion. A nozzle assembly includes a gusset or base portion and a pair of nozzles. At least one inlet conduit is structured to deliver breathable gas into the frame and nozzle assembly for breathing by the patient. A pair of second connector portions are removably and rotatably connected to respective first connector portions of the frame and are in communication with respective inlet conduits, e.g., directly or via angle connectors. A headgear assembly is removably connected to the pair of second connector portions and/or the angle connectors so as to maintain the frame and the nozzle assembly in a desired adjusted position on the patient's face.
1. A patient interface for sealed delivery of a flow of breathable gas at a continuously positive pressure with respect to ambient air pressure to an entrance to a patient's airways including at least entrance of a patient's nares, while the patient is sleeping, to ameliorate sleep disordered breathing, the patient interface comprising:
a patient contacting portion forming a plenum chamber and adapted to sealingly engage with the patient; and
a vent assembly configured to vent gas from the plenum chamber, the vent assembly including at least one vent having a first end configured to face atmosphere, a second end opposite the first end and configured to face the plenum chamber, and a central portion provided between the first and second ends including a substantially conical portion having a varying diameter that is larger towards the second end,
wherein a counter bore is positioned adjacent the first end.
2. The patient interface according to claim 1 , wherein a substantially cylindrical portion is provided between the first end and the substantially conical portion.
3. The patient interface according to claim 2 , wherein the substantially cylindrical portion has a length that is shorter than a length of the substantially conical portion.
4. The patient interface according to claim 1 , wherein the at least one vent has a length of at least 4 mm.
5. The patient interface according to claim 1 , wherein the at least one vent has a length of 4-8 mm.
6. The patient interface according to claim 5 , wherein the length is 6 mm.
7. The patient interface according to claim 1 , wherein the counter bore has a depth of about 0.4-0.6 mm and an internal exit edge radius of curvature of about 0.1-0.2 mm.
8. The patient interface according to claim 7 , wherein the depth is about 0.5 mm and the radius of curvature is about 0.15 mm.
9. The patient interface according to claim 1 , wherein the at least one vent has a minimum diameter of about 1-3 mm.
10. The patient interface according to claim 9 , wherein the minimum diameter is about 1.65-1.85 mm.
11. The patient interface according to claim 10 , wherein the minimum diameter is about 1.75 mm.
12. The patient interface according to claim 1 , wherein the at least one vent includes a plurality of vents that are unequally spaced apart from one another.
13. The patient interface according to claim 1 , wherein the vent assembly includes at least one vent provided on the patient contacting portion.
14. The patient interface according to claim 1 , wherein the vent assembly includes at least one vent provided on a frame that at least in part supports the patient contacting portion.
15. The patient interface according to claim 1 , wherein the patient contacting portion is a nozzle assembly.
16. The patient interface according to claim 1 , wherein at least one of the first and second ends provides a molding seam positioned out of a main air stream of the at least one vent.
17. The patient interface according to claim 16 , wherein the molding seam is positioned to at least reduce noise from molding flash.
18. The patient interface according to claim 1 , wherein the counter bore has an inside radius of curvature to prevent noise creating flash.