Sealing cushion for a patient interface device that has a custom cushion support assembly

A method of using a patient interface device structured to engage a patient's sub-nasal area, the patient interface device including a unitary patient interface device body including a sidewall defining a chamber, the sidewall including a front wall, a rear wall, a bottom wall and an upper wall, the upper wall including a cushion body structured to engage the patient's sub-nasal area, the cushion body including a deformable engagement portion defining a first passage and an inner resilient layer defining a second passage aligned with the first passage along a common axis, wherein the engagement portion is spaced from inner resilient layer and the engagement portion and the inner resilient layer form a pocket;

• and a custom cushion support assembly body separate and distinct from the unitary patient interface device body and structured to be received within the pocket between the engagement portion and the inner resilient layer, the custom cushion support assembly body including an upper surface including a custom contour having a shape that corresponds to dimensions measured from the patient's face, the custom cushion support assembly body defining a third passage aligned with the first passage and the second passage along the common axis;
• the method comprising:
• inserting the custom cushion support assembly body into the pocket, wherein the custom contour deforms the engagement portion to correspond to the patient's full sub-nasal area;
• and
• positioning the patient interface device body under the patient's nose with the cushion body engagement portion in corresponding engagement with the patient's full sub-nasal area.