Mask cushion and frame assembly

摘要

A respiratory mask assembly includes a rigid mask frame (160) with a rim portion comprising a rearwardly projecting tongue (620) and lateral flange (640) and a cushion (180) having a rim with a corresponding groove (740) and a rearwardly facing shoulder (720). A clip in the form of a collar (800) passes over the cushion, engaging behind the shoulder (720), and has securing tabs (820) which engage recesses (660) in the flange (640).