Mask system

1. A mask system for providing respiratory therapy to the airways of a patient, the mask system comprising:

a frame including a pair of upper headgear connectors, each of the pair of upper headgear connectors including an elongated rigidizer arm;

a pair of lower headgear connectors, each of said pair of lower headgear connectors configured to connect to the frame;

a sealing arrangement structured to interface with the frame, the sealing arrangement adapted to form a seal with a patient's nose and mouth;

wherein the sealing arrangement forms a breathing chamber pressurizable to a therapeutic pressure, the sealing arrangement including a circular inlet opening structured to receive a flow of air at the therapeutic pressure for breathing by the patient;

an elbow adapted to be connected to an air delivery tube to deliver the flow of air at the therapeutic pressure to the breathing chamber; and

headgear to maintain the mask system in position on a patient's head,

the headgear including a rear strap, a pair of upper side straps adapted to be routed over the patient's ears, and a pair of lower side straps adapted to be routed under the patient's ears, wherein each of the pair of upper side straps are adapted to connect to a respective one of the pair of upper headgear connectors of the frame and each of the pair of lower side straps are adapted to connect to a respective one of the pair of lower headgear connectors,

wherein the sealing arrangement comprises a face-contacting side and a non face-contacting side,

wherein the non face-contacting side of the sealing arrangement comprises a front wall having the circular inlet opening adapted to communicate with the elbow,

wherein the front wall includes an inside surface arranged to be at said therapeutic pressure in use and an outside surface arranged to be at ambient pressure in use, and the frame includes a wall arranged along the outside surface of the front wall so that the wall is outside the breathing chamber,

wherein the face-contacting side of the sealing arrangement includes a sealing flap,

wherein the sealing flap in a nasal bridge region of the sealing arrangement includes a dip-shape or valley when viewed from a top of the sealing arrangement, the dip-shape or valley being adapted to be complementary to a shape of a nasal bridge of the patient,

wherein the sealing arrangement includes a side-of-nose region, wherein the sealing flap is thinner in the nasal bridge region than in the side-of-nose region, and

wherein the sealing arrangement includes at least one lateral stabilising portion adapted to direct a force against a side of the patient's nose.

2. The mask system according to claim 1 , wherein the mask system is provided without a forehead support.

3. The mask system according to claim 1 , wherein the sealing arrangement comprises a co-molded construction in which the face-contacting side and the non face-contacting side comprise separately formed and attached components.

4. The mask system according to claim 1 , wherein each of said pair of lower headgear connectors comprises a headgear clip configured to connect to a respective one of a pair of abbreviated rigidizer arms provided to the frame.

5. The mask system according to claim 1 , wherein the sealing arrangement includes a lower lip or chin region, and the sealing flap in the lower lip or chin region includes a valley when viewed from a bottom of the sealing arrangement.

6. The mask system according to claim 1 , wherein each said elongated rigidizer arm has a curved portion adapted to extend below a respective eye of the patient.

7. The mask system according to claim 1 , wherein the non face-contacting side of the sealing arrangement includes one or more interfacing structures adapted to interlock with the frame, and wherein the frame and the sealing arrangement are constructed and arranged such that a proper connection between the frame and the sealing arrangement results in an audible clicking noise.

8. The mask system according to claim 1 , wherein the sealing flap includes a seal forming surface adapted to form the seal with the patient's nose and mouth, the seal forming surface comprising a frosted surface finish.

9. The mask system according to claim 1 , wherein the sealing flap includes a length that varies in different regions of the sealing arrangement, and wherein the length of the sealing flap in the side-of-nose region is longer than other regions of the sealing arrangement.

10. The mask system according to claim 1 , wherein the face-contacting side of the sealing arrangement includes a cross-sectional profile in the side-of-nose region and a corner of mouth region adapted to anchor and stabilize the sealing arrangement on the patient's face.