Patent ID: 6561190
Filing Date: 2003-05-13
Classification: A61M,A62B

Abstract:
A mask assembly for use with a system for supplying breathable gas pressurized above atmospheric pressure to a human or animal patient's airways, the mask assembly comprising:(a) a mask which is adapted for fluid connection with a gas supply conduit, (b) a region of the mask defining a first venting orifice adapted for gas washout, and (c) an insert formed of an elastomeric material positioned within said first venting orifice, said insert having at least one orifice therethrough for gas washout, said at least one orifice having a cross-sectional contour from a side of the orifice on the patient's side of the mask to an atmosphere side of the orifice, the cross-sectional contour remaining substantially constant in size as gas is passed therethrough.