FIG. 1 is a front perspective view of a patient interface according to a first embodiment of our design;

FIG. 2 is a reverse perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a left side view thereof;

FIG. 8 is a right side view thereof;

FIG. 9 is a front perspective view of a patient interface according to a second embodiment of our design;

FIG. 10 is a reverse perspective view thereof;

FIG. 11 is a front view thereof;

FIG. 12 is a rear view thereof;

FIG. 13 is a top view thereof;

FIG. 14 is a bottom view thereof;

FIG. 15 is a left side view thereof; and,

FIG. 16 is a right side view thereof.

Where included, the use of stippling and shading is provided to show contrast in materials to differentiate between different areas of the design.

The broken lines illustrate environmental structure of the patient interface, which forms no part of the claimed design.