Patent ID: 6357441
Filing Date: 2002-03-19
Classification: A61B,A61M

Abstract:
A nasal mask cushion assembly to sealingly connect a nasal mask to a wearer's face by adjusting tension on at least one tension strap connected to the nasal mask, the cushion assembly comprising:a generally triangularly shaped frame of resilient material, the frame including an inner surface, an outer surface, an aperture, and a rim defining the perimeter of the aperture, the rim including a notch in a region of the rim adapted to receive the bridge of the wearer's nose; and a generally triangularly shaped membrane of resilient material, the membrane including an aperture adapted to receive the wearer's nose, an outer surface including a seal forming portion adapted to deform and form a seal over a portion of the wearer's face in a region between the base of the nose and the upper lip and around the sides and over the bridge of the wearer's nose when the mask is in use, an inner surface opposing the outer surface of the frame and spaced a first distance from the outer surface of the frame in at least the region of the frame adapted to receive the bridge of the wearer's nose when the mask is in use, an edge defining the perimeter of the aperture, and a notch in a region of the membrane adapted to receive the bridge of the wearer's nose, wherein the membrane is more flexible than the frame; the aperture of the frame is larger than the aperture of the membrane; the edge of the membrane is spaced a second distance from the rim, the second distance being variable and largest in the regions of the rim and the membrane adapted to receive the bridge of the wearer's nose; and the first distance between the outer surface of the frame and the inner surface of the membrane is variable with the tension applied to the at least one tension strap.