Mask and vent assembly therefor
First Claim
1. A CPAP mask assembly for use with a system for supplying breathable gas pressurized above atmospheric pressure to a human or animal, the CPAP mask assembly including:
- a mask having an inlet tube that is, in use, adapted to be in fluid communication with a gas supply conduit, said mask including a shell made of an elastomeric material, the shell being provided with a sealing membrane to provide a gas tight seal with the user in use, the shell and the sealing membrane defining a breathing chamber of the mask; and
a vent array provided as part of the shell, the vent array including four or more gas washout orifices extending through the elastomeric material of the shell, the orifices extending from an inner side of the vent assembly placed, in use, adjacent the human or animal'"'"'s face to an outer side placed, in use, adjacent atmosphere, the gas washout orifices being open in use,wherein a cross-sectional area of each orifice at the inner side of the vent assembly is larger than a cross-sectional area of the orifice at the outer side of the vent assembly, each orifice having a transition portion that decreases in size from the inner side to the outer side, each said orifice being in communication with a source of pressurized gas in use.
4 Assignments
0 Petitions
Accused Products
Abstract
A mask (10) for use with a system for supplying breathable gas pressurised above atmospheric pressure to a human or animal'"'"'s airways. The mask (10) includes a mask shell (12) which is, in use, in fluid communication with a gas supply conduit and a gas washout vent assembly (20). The gas washout vent assembly (20) includes at least one gas washout orifice (22) extending from a first side of the vent assembly (20) positioned, in use, adjacent the human or animal'"'"'s face and a second side positioned, in use, adjacent the atmosphere. The cross-sectional area of the orifice (22) at the first side is larger than the cross-sectional area of the orifice (22) at the second side.
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Citations
41 Claims
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1. A CPAP mask assembly for use with a system for supplying breathable gas pressurized above atmospheric pressure to a human or animal, the CPAP mask assembly including:
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a mask having an inlet tube that is, in use, adapted to be in fluid communication with a gas supply conduit, said mask including a shell made of an elastomeric material, the shell being provided with a sealing membrane to provide a gas tight seal with the user in use, the shell and the sealing membrane defining a breathing chamber of the mask; and a vent array provided as part of the shell, the vent array including four or more gas washout orifices extending through the elastomeric material of the shell, the orifices extending from an inner side of the vent assembly placed, in use, adjacent the human or animal'"'"'s face to an outer side placed, in use, adjacent atmosphere, the gas washout orifices being open in use, wherein a cross-sectional area of each orifice at the inner side of the vent assembly is larger than a cross-sectional area of the orifice at the outer side of the vent assembly, each orifice having a transition portion that decreases in size from the inner side to the outer side, each said orifice being in communication with a source of pressurized gas in use. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A CPAP mask assembly for use with a system for supplying breathable gas pressurized above atmospheric pressure to a human for treatment of obstructive sleep apnea, the CPAP mask assembly comprising:
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a mask including a rigid plastic shell and a flexible seal to seal against the human in use; and a vent assembly provided to exhaust CO2-laden gas from the mask or a conduit provided to the mask, the mask or conduit including an opening delineated by a rim, the vent assembly comprising an insert attached to the mask or conduit and including a plurality of gas washout orifices, each orifice extending from an inner side of the insert to an outer side of the insert, each orifice being open in use, wherein at least one portion of the insert includes an inner flange portion defining a first surface that engages an inner surface of the mask or conduit, and an outer flange portion defining a second surface that engages an outer surface of the mask or conduit, the first and second surfaces defining a recess or groove therebetween to receive the rim of the mask or conduit to retain connection between the insert and the mask or conduit, and wherein a cross-sectional area of each orifice at the inner side of the insert is larger than a cross-sectional area of the orifice at the outer side of the insert. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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Specification