Patient interface

A cushion assembly to deliver a flow of air to a patient for treatment of sleep disordered breathing, the cushion assembly comprising:

• a plenum chamber at least partially forming a cavity pressurisable to a therapeutic pressure of at least 6 cmH2O above ambient air pressure, said plenum chamber including at least one plenum chamber inlet port sized and structured to receive the flow of air at the therapeutic pressure for breathing by the patient;
• and
• a seal-forming structure having a textile membrane constructed and arranged to form a seal with a region of the patient's face surrounding an entrance to an airway of the patient, said textile membrane having at least one hole formed therein such that the flow of air at said therapeutic pressure is delivered to at least an entrance to the patient's nares, the seal-forming structure constructed and arranged to maintain said therapeutic pressure in the cavity throughout the patient's respiratory cycle in use,
• wherein the seal-forming structure includes a flexible support structure to support the textile membrane, the support structure having at least one portion that is stiffer than a portion of the textile membrane,
• wherein the plenum chamber and the support structure are integrally formed of silicone as a one-piece structure, the silicone of the plenum chamber and the support structure providing flexibility to assist bending of the cushion assembly to accommodate the patient's facial features,
• wherein, in use, the textile membrane is configured to press against the patient's face such that the patient's nose is not received in the cavity,
• wherein, at a transition portion, the textile membrane is attached to the support structure along an outer edge of the textile membrane and an inner edge of the support structure such that the textile membrane extends radially inwardly beyond the support structure along a posterior patient-facing side of the seal-forming structure, and
• wherein, in a cross-sectional view, at the transition portion, both the support structure and the textile membrane extend along a curve in a direction from an anterior side of the seal-forming structure to the posterior patient-facing side of the seal-forming structure.

A cushion assembly to deliver a flow of air to a patient for treatment of sleep disordered breathing, the cushion assembly comprising:

• a plenum chamber at least partially forming a cavity pressurisable to a therapeutic pressure of at least 6 cmH2O above ambient air pressure, said plenum chamber including at least one plenum chamber inlet port sized and structured to receive a flow of air at the therapeutic pressure for breathing by a patient;
• and
• a seal-forming structure having a textile membrane constructed and arranged to form a seal with a region of the patient's face surrounding an entrance to an airway of the patient, said textile membrane having at least one hole formed therein such that the flow of air at said therapeutic pressure is delivered to at least an entrance to the patient's nares, the seal-forming structure constructed and arranged to maintain said therapeutic pressure in the cavity throughout the patient's respiratory cycle in use,
• wherein the textile membrane comprises a textile material and a membrane layer applied thereto to make the textile material substantially air impermeable, the textile material being a knit textile,
• wherein the seal-forming structure includes a flexible support structure to support the textile membrane, the support structure being connected to the plenum chamber,
• wherein the plenum chamber and the support structure are integrally formed of silicone as a one-piece structure,
• wherein the textile membrane is attached to the support structure along an outer perimeter of the textile membrane such that the textile membrane extends radially inwardly beyond the support structure,
• wherein, in use, the textile membrane is configured to press against the patient's face such that the patient's nose is not received in the cavity, and
• wherein the textile membrane has a dome shape in a corner region of the textile membrane configured to seal against the patient's subalare, and a saddle shape at a lower central region of the textile membrane configured to seal against the patient's subnasale.