A patient interface for treatment of sleep disordered breathing, comprising:
- a cushion module comprising:
- a plenum chamber pressurisable to a therapeutic pressure of at least 6 cmH2O above ambient air pressure, said plenum chamber including a plenum chamber inlet port sized and structured to receive a flow of air at a therapeutic pressure for breathing by a patient;
- a pair of connection portions coupled to the plenum chamber on respective sides thereof;
- and
- a seal-forming structure constructed and arranged to form a seal with a region of a patient's face surrounding an entrance to a patient's airways for sealed delivery of a flow of air at the therapeutic pressure of at least 6 cmH2O above ambient air pressure throughout a patient's respiratory cycle in use, said seal-forming structure having a hole therein such that the flow of air at said therapeutic pressure is delivered to at least an entrance to a patient's nares, the seal-forming structure constructed and arranged to maintain said therapeutic pressure in the plenum chamber throughout the patient's respiratory cycle in use;
- and
- a positioning and stabilising structure to provide a force to hold the cushion module in a therapeutically effective position on a patient's head, the positioning and stabilising structure comprising:
- a pair of a superior strap portions configured to, in use, extend over at least a portion of the patient's cheek and between the patient's eye and ear on respective sides of the patient's head;
- a pair of inferior strap portions configured to, in use, extend over a region of the patient's head below and/or behind the patient's ear on respective sides of the patient's head;
- a pair of a posterior connecting strap portions respectively connected to or formed integrally with a respective one of the superior strap portions and a respective one of the inferior strap portions;
- a pair of anterior strap portions respectively connected to or formed integrally with a respective one of the superior strap portions and a respective one of the inferior strap portions, the pair of anterior strap portions being spaced apart from the pair of posterior connecting strap portions;
- wherein the positioning and stabilising structure has only two connection points with the cushion module, the connection points being provided at respective sides of the cushion module by respective attachment of the pair of anterior strap portions to the pair of connection portions,
- wherein each anterior strap portion comprises:
- a strap receiving portion;
- and
- a strap attachment portion which is releasably connectable to the strap receiving portion such that the anterior strap portion forms a loop, wherein in use the loop is configured to engage a respective one of the connection portions;
- wherein the strap receiving portion is configured to engage the strap attachment portion in a selected one of a plurality of possible positions when the patient interface is worn,
- wherein the posterior connecting strap portion has:
- 1) a greater stretch capability than the superior strap portion and, 2) a lesser stretch capability than the inferior strap portion, wherein the stretch capabilities allow the positioning and stabilizing structure to be removable from the patient's head when the loop engages the connection portion, and
- wherein the patient interface does not comprise a forehead support.