Patent ID: 11969552
Assignee: RESMED PTY LTD
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A mask system for delivering breathable gas at positive pressure to a patient for treatment of sleep disordered breathing, comprising:
a frame having an opening formed therein and arranged to receive the breathable gas in use;
an axis extending through the opening in the frame;
a cushion connected to the frame, the cushion comprising silicone and configured to, in use, form a seal with the patient's face to deliver the breathable gas to an airway of the patient, an inner edge of the cushion defining a cushion aperture through which the breathable gas is delivered to the patient, the axis extending through the cushion aperture;
the frame being formed of a material having increased rigidity as compared to the silicone material of the cushion;
a fluid connector forming a gas passageway and configured to be disposed between the frame and an air delivery tube to, in use, convey the breathable gas from the air delivery tube towards the opening in the frame, an end portion of the fluid connector defining an aperture at a first end of the gas passageway;
a shroud connected to the fluid connector; and
a pair of elongate arms connected to the shroud and configured to extend, in use, upwardly and posteriorly along respective sides of the patient's face, each elongate arms having a slot formed therein to receive an end portion of the headgear strap,
wherein the frame and the end portion of the fluid connector are arranged such that the axis extends through the aperture in the end portion of the fluid connector,
wherein the fluid connector includes a plurality of vent holes formed therein for washout of exhaust gases, the plurality of vent holes being disposed along the end portion of the fluid connector in a spaced-apart arrangement forming an arc around the axis of the opening in the frame,
wherein the plurality of vent holes formed in the fluid connector consists only of a single row of vent holes,
wherein the plurality of vent holes includes a first vent hole, a second vent hole, a third vent hole, a fourth vent hole and a fifth vent hole arranged in series, the first vent hole, the second vent hole, the third vent hole, the fourth vent hole and the fifth vent hole all being disposed along a section of the end portion of the fluid connector that extends only half-way around a perimeter of the fluid connector, and
wherein the mask system does not include a forehead support configured to engage the patient's forehead in use.