US D583471 S1
The ornamental design for a medical instrument, as shown and described.
FIG. 1 is a front perspective view of a medical instrument in accordance with the new design, showing a break indicating a tubular detail of no particular length;
FIG. 2 is a left side view thereof, the right side being a mirror image;
FIG. 3 is a top view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 is a rear view thereof; and,
FIG. 6 is a front view thereof.