The ornamental design for a medicaldevice, as shown and described.
FIG. 1 is a perspective view of a first embodiment of a medical device of the present invention;
FIG. 2 is perspective view of another related embodiment of a medical device of the present invention; and,
FIG. 3 is perspective view of another related embodiment of a medical device of the present invention.
The drawings represented in FIGS. 1-3 disclose the complete appearance of the design, as the bottom is a mirror image of the top, and the side view is identical around the entire circumference.