A nasal cushion (30) comprises a substantially triangularly shaped frame (32) from which extends a membrane (34). The frame (32) has a scalloped edge (36) by which the cushion (30) is affixed to a mask body. The membrane (34) has an aperture (38) into which the wearer's nose is received. The membrane...http://www.google.es/patents/US6357441?utm_source=gb-gplus-sharePatente US6357441 - Nasal mask and mask cushion therefor
