Patent ID: 8276588

Claim:
A mask for delivering a pressurized breathable gas into a person's nose, mouth, or both with a shape that can be adjusted to fit the contours of the person's face, comprising: a mask for directing a pressurized breathable gas into a person's nose, mouth, or both that includes at least two shape-changing members; wherein these shape-changing members comprise extendable cylindrical members, extendable pistons, or both; wherein the shapes of two or more shape-changing members can be actively, individually, reversibly, and automatically adjusted by a means selected from the group consisting of hydraulic pistons, pneumatic pistons, and Micro Electrical Mechanical Systems (MEMS); and wherein changes in the shapes of the shape-changing members change the shape of the mask perimeter so that the mask better fits the contours of the person's face while the person wears the mask.