US D610252 S1
The ornamental design for a medical injector, as shown and described.
FIG. 1 is a front plan view of the medical injector of my new design;
FIG. 2 is a left side view thereof,
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a bottom view thereof; and,
FIG. 6 is a top view thereof.