Patent ID: 8573213

Claim:
A cushion for a patient interface that delivers breathable gas to a patient, the cushion including a nasal bridge region, a pair of cheek regions and a chin region, the cushion defining, at least in part, a breathing cavity, the cushion comprising: a membrane including a nasal bridge region, a pair of cheek regions and a chin region to form a continuous seal on the patient's face, the membrane having an aperture adapted to receive the patient's nose and mouth; and a support structure to support the membrane, the support structure including an underlying cushion to provide support to the membrane, the underlying cushion including a nasal bridge region, a left cheek region and a right cheek region, the underlying cushion, in cross section, including an inwardly curved portion that curves inwardly toward the breathing cavity, wherein the membrane extends from the support structure and, from front view, covers the underlying cushion, wherein the underlying cushion and the membrane form at least a double-walled construction in the nasal bridge region and the pair of cheek regions of the cushion, and wherein: the inwardly curved portion of the underlying cushion terminates at a free end of the underlying cushion, the inwardly curved portion of the underlying cushion extends along the nasal bridge region, the left cheek region and the right cheek region of the underlying cushion, and the inwardly curved portion of the underlying cushion terminates proximate a transition between the chin region and a respective cheek region of the cushion to form an underlying cushion cutaway profile in the chin region of the cushion, wherein the inwardly curved portion of the underlying cushion is absent in the underlying cushion cutaway profile.