Patent ID: 8136525

Claim:
A mask system for use between a patient and a device to deliver a breathable gas to the patient, the mask system comprising: a mouth cushion formed of silicone and structured to sealingly engage around an exterior of a patient's mouth in use; a pair of nasal prongs releasably attached to a side wall of the mouth cushion and structured to sealingly communicate with nasal passages of a patient's nose in use; an elbow to deliver breathable gas to the patient at a pressure elevated above atmospheric pressure; and a headgear assembly to maintain the mouth cushion and the nasal prongs in a desired position on the patient's face, wherein each prong includes a base portion provided to the mouth cushion, a head portion to seal with the patient's nose, and a stalk to interconnect the base portion and the head portion, wherein each prong includes a first trampoline-like base provided between the head portion and the stalk and a second trampoline-like base provided between the stalk and the base portion, wherein the first and second trampoline-like bases allow rotation of the stalk relative to both the head portion and the base portion in use and allow reduction in height of the head portion relative to the base portion by allowing the stalk to move axially into the base portion and the head portion in use.