Patent ID: 8220459

Claim:
A cushion for a patient interface that delivers breathable gas to a patient, the cushion comprising: a base wall structured to be connected to a frame; an underlying support cushion extending away from the base wall towards the patient's face in use; and a membrane provided to substantially cover at least a portion of the underlying cushion, the membrane including at least a nasal bridge region adapted to form a continuous seal on a nasal bridge region of the patient's face, wherein the membrane includes a curvature, and the membrane in the nasal bridge region has a substantially flat portion on an apex of the membrane curvature in elevation view, wherein the nasal bridge region of the membrane includes a contoured portion along a longitudinal axis of the cushion to closely follow a contour or curvature of the patient's nasal bridge region, the contoured portion curves inwardly towards a cavity of the cushion along a radius to terminate at an inner edge of the membrane, the contoured portion having a free end that is angled with respect to a face contacting plane of the cushion in the range of 30-50°, and wherein the membrane in the nasal bridge region forms an elongated ridge along the longitudinal axis of the cushion, the elongated ridge having sloping sides that meet to form an elongated crest, and the elongated ridge is structured to engage with the patient's nasal bridge region in use.