Patent ID: 9149593
Filing Date: 2015-10-06
Classification: A61M

Abstract:
1. A nasal mask defining a breathing chamber for the delivery of a supply of gas at positive pressure to an airway of a patient, the nasal mask including a sidewall, and a cushion located adjacent the sidewall at a rear side of the nasal mask, a rearward sealing surface of the cushion has a contour in a top lip region that is formed with a concave curvature to have a shape that is complementary to a top lip region of the patient, the contour of the rearward sealing surface of the cushion is constructed and arranged to extend in use along respective left and right sides of a nose of the patient from a nasal bridge region of the patient located adjacent a joint between a nasal bone and a cartilage to respective left and right nasal corner regions of the patient adjacent left and right naso-labial creases, the contour of the rearward sealing surface of the cushion is further adapted to extend along the top lip of the patient from the left side of the nose to the right side of the nose, the cushion includes a relatively thick backup band formed from a resilient flexible material and extending from the sidewall to form respective cantilevers in the top lip region, a corner region and a side of nose region of the cushion, said cantilevers each having a length and a thickness and said cantilevers defining respective lip region, corner region and side of nose region stiffnesses, wherein the cantilever in the corner region is stiffer than the cantilever in the top lip region in a direction normal to the plane of a patient's face, the cushion further includes a relatively thin facial flap, the facial flap is inwardly curving and extends around the perimeter of the cushion to define the rearward sealing surface of the cushion, an inner edge of the facial flap defines an orifice through which a portion of a nose of the patient passes in use.