Nasal mask
First Claim
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1. A shell for a nasal mask, comprising:
- a shell portion defining a hollow enclosure with a rearwardly facing opening defined by re-entrant edge portions of the shell portion, said re-entrant edge portions extending transversely inwardly and rearwardly from an intermediate portion of the shell toward said rearwardly facing opening, and wherein the shell portion is at least generally symmetrical about a median plane, and said shell portion having two gas inlet orifices disposed one on each side of the median plane.
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Abstract
A nasal mask has a shell portion that is a hollow enclosure with a rearwardly facing opening that is defined by edge portions of the shell portion. A resiliently deformable endless interface member engages and extends around the edge portion of the opening and forms a seal between the shell portion and the user'"'"'s face. The shell portion and the interface member are generally symmetrical about a median place. The shell portion has two gas inlet orifices, one on each side of the median place. Each orifice is provided with an outwardly extending tubular portion for engaging a gas inlet tube.
138 Citations
20 Claims
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1. A shell for a nasal mask, comprising:
a shell portion defining a hollow enclosure with a rearwardly facing opening defined by re-entrant edge portions of the shell portion, said re-entrant edge portions extending transversely inwardly and rearwardly from an intermediate portion of the shell toward said rearwardly facing opening, and wherein the shell portion is at least generally symmetrical about a median plane, and said shell portion having two gas inlet orifices disposed one on each side of the median plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 11, 12, 13, 14, 15, 16, 17)
- 8. The combination of claim 8 wherein each pillow engaging member comprises a disk member, and each pillow is generally tubular and corrugated and comprises a tapering tip, a plurality of relatively narrow intermediate portions and a plurality of relatively wide intermediate portions, whereby a height of the tip within the shell can be adjusted by engaging the disk member in a selected relatively wide intermediate portion of the pillow.
- 18. An interface member for a nasal mask, said interface member comprising a generally triangular, resiliently deformable endless member having grooves in a generally planar face and in adjacent sides thereof adapted to receive re-entrant edge portions of a shell portion, and wherein said endless member and the grooves therein are at least generally symmetrical about a median plane.
Specification