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

FIG. 2 is a rear perspective view of the patient interface device shown in FIG. 1;

FIG. 3 is a front elevational view of the patient interface device shown in FIG. 1;

FIG. 4 is a rear elevational view of the patient interface device shown in FIG. 1;

FIG. 5 is a right side elevational view of the patient interface device shown in FIG. 1;

FIG. 6 is a left elevational side view of the patient interface device shown in FIG. 1;

FIG. 7 is a top plan view of the patient interface device shown in FIG. 1; and,

FIG. 8 is a bottom plan view of the patient interface device shown in FIG. 1.

The portions drawn in broken lines are shown for illustrative purposes only and form no part of the claimed design.