Full-face mask and mask cushion therefor
First Claim
1. A mask assembly for delivery of a supply of gas to an entrance to the airways of a patient, said patient having a nasal bridge region, a cheek region and a lip region, said mask assembly comprising:
- a headstrap system to secure the mask assembly relative to the patient'"'"'s head;
a mask body defining a cavity to receive a nose of the patient; and
a nasal cushion, said nasal cushion comprising;
a first cushion portion secured to the mask body,a second cushion portion adapted to confront a face of a patient in use, anda wall-portion located between said first and second cushion portions, wherein;
said second cushion portion comprises first and second membranes, each of said first and second membranes having respective first ends located adjacent said wall-portion, and each of said first and second membranes having respective second ends forming respective rims defining an aperture through which the patient'"'"'s nose is received in use,said second membrane is more flexible and/or thinner than said first membrane,said second membrane is pre-formed with a shape adapted to be substantially complementary to a patient'"'"'s facial contour,said second membrane defines a seal-forming portion on an outer surface thereof, said seal-forming portion having an inner periphery and an outer periphery, the inner periphery of said seal-forming portion is constructed and arranged to be positioned in use adjacent a nasal bridge region, along sides of the nose, and between a top lip and a base of a nose to effect a seal,the seal forming portion is structured such that it is not required to turn in on itself to conform with the patient'"'"'s face, in use,said first membrane provides a supporting structure for the second membrane, andsaid second membrane covering said first membrane.
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Accused Products
Abstract
A full-face cushion (30B) comprises a substantially triangularly shaped frame (32) from which extends a membrane (34). The frame (32) has a scalloped edge (36) by which the cushion (30B) is affixed to a mask body (46) to form a full-face mask (60B). The membrane (34) has an aperture (38) into which the wearer'"'"'s nose is received. The member (34) is spaced away from the rim (40) of the frame (32), and its outer surface (41) is of substantially the same shape as the rim (40). Respective notches (42, 44) receive the bridge of the wearer'"'"'s nose. The wearer'"'"'s nose and lips are received through the aperture (38) into the chamber within the mask body (46). The seal forming portion (45) thus contacts both the surface of the wearer'"'"'s nose and a portion of the wearer'"'"'s face in the region between the bottom lip and the chin, and around the sides and over the bridge of the nose. The shape of the seal forming portion (45) is particularly suited to effectively seal the difficult region of the facial contour that is the crease between the sides of the nose and the face.
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Citations
41 Claims
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1. A mask assembly for delivery of a supply of gas to an entrance to the airways of a patient, said patient having a nasal bridge region, a cheek region and a lip region, said mask assembly comprising:
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a headstrap system to secure the mask assembly relative to the patient'"'"'s head; a mask body defining a cavity to receive a nose of the patient; and a nasal cushion, said nasal cushion comprising; a first cushion portion secured to the mask body, a second cushion portion adapted to confront a face of a patient in use, and a wall-portion located between said first and second cushion portions, wherein; said second cushion portion comprises first and second membranes, each of said first and second membranes having respective first ends located adjacent said wall-portion, and each of said first and second membranes having respective second ends forming respective rims defining an aperture through which the patient'"'"'s nose is received in use, said second membrane is more flexible and/or thinner than said first membrane, said second membrane is pre-formed with a shape adapted to be substantially complementary to a patient'"'"'s facial contour, said second membrane defines a seal-forming portion on an outer surface thereof, said seal-forming portion having an inner periphery and an outer periphery, the inner periphery of said seal-forming portion is constructed and arranged to be positioned in use adjacent a nasal bridge region, along sides of the nose, and between a top lip and a base of a nose to effect a seal, the seal forming portion is structured such that it is not required to turn in on itself to conform with the patient'"'"'s face, in use, said first membrane provides a supporting structure for the second membrane, and said second membrane covering said first membrane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 39, 40, 41)
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20. A mask assembly for delivery of a supply of gas to an entrance to the airways of a patient, said patient having a nasal bridge region, a cheek region and a chin region, said mask assembly comprising:
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a headstrap system to secure the mask assembly relative to the patient'"'"'s head; a mask body defining a cavity to receive a nose of the patient; and a nasal cushion, said nasal cushion comprising; a first cushion portion adapted to be secured to the mask body in use, a second cushion portion adapted to confront a face of a patient in use, and a wall-portion located between said first and second cushion portions, wherein; said second cushion portion comprises first and second membranes, each of said first and second membranes having respective first ends located adjacent said wall-portion, and each of said first and second membranes having respective second ends forming respective rims defining an aperture through which the patient'"'"'s nose and mouth are received in use, said second membrane is more flexible and/or thinner than said first membrane, said second membrane is pre-formed with a shape substantially complementary to a patient'"'"'s facial contour, said second membrane defines a seal-forming portion on an outer surface thereof, said seal-forming portion having an inner periphery and an outer periphery, the inner periphery of said seal-forming portion is constructed and arranged to be positioned in use adjacent a nasal bridge region, along sides of the nose, and below lips or on a chin to effect a seal, the seal forming portion is structured such that it is not required to turn in on itself to conform with the patient'"'"'s face, in use, said first membrane provides a supporting structure for the second membrane, and said second membrane covering said first membrane. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification