US Patent 7207334 Respiratory mask assembly

A respiratory mask assembly for delivering breathable gas to a patient includes a mask frame having a first cooperating interlocking structure. A cushion clip having a second cooperating interlocking structure is selectively detachable to the mask frame. The first and second cooperating interlocking structures interlock with one another in a cooperating relationship to secure the cushion clip on the mask frame. A mask cushion has a portion positioned between the mask frame and the cushion clip so as to retain the mask cushion on the mask frame.