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

FIG. 2 is a front elevational view of the patient interface device shown in FIG. 1;

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

FIG. 4 is a left side elevational view of the patient interface device shown in FIG. 1, the right side elevational view being similar thereto;

FIG. 5 is a top plan view of the patient interface device shown in FIG. 1; and,

FIG. 6 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.