Interface assemblies for respiratory therapy

Abstract

In some embodiments there is provided a headgear assembly for a full-face under-nose respiratory mask comprising a strap assembly including a rear panel, a crown strap, a pair of opposing upper side straps, and a pair of opposing lower side straps. The assembly further comprises a flexible headgear connector element, wherein a free end of each of the upper straps is coupled to the headgear connector element, and wherein the headgear connector element is configured to extend laterally across and be removably fastened to a frame of the respiratory mask below a tip of a user's nose. There is also provided a respiratory mask assembly comprising a mask frame and a cushion module, the mask frame comprising a breathing gas inlet configured to receive a supply of breathable gas and to deliver the breathable gas to the cushion module, the cushion module being configured to form a seal with a user's face. The mask assembly can further comprise a bias vent in communication with the cushion module, and configured to allow air to be exhausted from the cushion module through the bias vent. the bias vent can be provided with a diffuser comprising diffuser material configured to extend over the bias vent, the diffuser material providing a tortuous air path from the bias vent through the diffuser. Embodiments are disclosed in which the bias vent and/or diffuser are provided on various components of the assembly.