A PATIENT INTERFACE

摘要

A patient interface for supplying respiratory therapy to a patient that comprises a vent allowing a leak or bias flow to exit the interface in use, the vent comprising a plurality of apertures, an aperture of the vent extending in a first direction from an interior surface to an exterior surface of the interface, the aperture having a varying cross sectional area along the first direction, the cross section being defined perpendicular to the first direction, the area decreasing moving from the interior surface to a first intermediate location within the aperture, and decreasing moving from the exterior surface to a second intermediate location within the aperture.