Patent ID: 8146595

Claim:
An adjustable patient interface for a breathing assistance system, comprising: a shell portion including one or more shell connection portions; at least one shell connection portion comprising a substantially rectangular slot; and a cushion portion including: a face contacting portion configured to contact a patient's face; an adjustment portion including one or more cushion connection portions; at least one cushion connection portion comprising a substantially rectangular tab; wherein each cushion connection portion corresponds to a region of the face contacting portion; and wherein each substantially rectangular tab is configured to interact with a corresponding substantially rectangular slot such that a particular substantially rectangular tab may be manually adjusted between and releasably locked in a plurality of predetermined positions relative to a particular substantially rectangular slot to adjust the distance between a region of the face contacting portion corresponding to the particular substantially rectangular tab and the shell portion; and a seal between each substantially rectangular tab and corresponding substantially rectangular slot, the seal configured to reduce or prevent gas flow between an area inside the patient interface and an area outside the patient interface.