Importance

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Abstract

A respiratory mask having a flexible seal that encompasses a space which is formed and adapted to receive nasal or nasal and oral portions of a user's face, the mask also having a rigid support extending continuously adjacent the perimeter of the flexible seal to support a portion thereof against radially outward deformation under the influence of internal pressure within the space encompassed thereby, while permitting a continuously extending perimeteral portion of the flexible seal to resiliently deform against the facial structure of the user to form a surface seal in engagement therewith, the degree of such deformation of the flexible seal being limited by insertion of selected spacers from a family of differently sized spacers intermediate the mask and the face of the user to thereby limit the minimum spacing that may be established between the mask and the face of the user, and to thereby accommodate adjustment of the seal profile to the user's face.

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First Claim