Patent ID: 6986352
Filing Date: 2006-01-17
Classification: A61M

Abstract:
1. A mask for delivering breathable gas to a user, comprising: a mask shell having a portion adapted to receive a supply of pressurized breathable gas and a user side; a gusset portion having a first side attached to the user side of the shell and having a second side; a cushion having a first portion constructed and arranged to attach to the second side of the gusset portion and a second portion constructed and arranged to contact a user's face in use and provide a seal between the mask and the user's face; and a headgear constructed and arranged to attach the mask shell to the user, said headgear including at least one headgear strap; wherein the gusset portion is constructed and arranged such that it can be selectively moved within a range of displacement to be set at a distance between the mask shell and the cushion, the gusset portion defining a gusset area exposed to the supply of pressurized breathable gas in use such that the supply of pressurized breathable gas acting on the gusset area provides a component of a contact force F wherein the mask shell, gusset portion, cushion and headgear are structured and arranged with respect to one another in use so that the force F