We claim the ornamental design for a medical probe, as shown and described.
FIG. 1 is a front perspective view of the cap, front, middle and rear portion of a medical probe, showing our new design in a dissembled state for ease of illustration;
FIG. 2 is a top view thereof;
FIG. 3 is a front view of the cap, front, middle and rear portion of a medical probe in consecutive positions of the portions as shown in FIG. 2 for ease of illustration;
FIG. 4 is a rear view thereof; and,
FIG. 5 is a front perspective view of the cap, middle and rear portion of a medical probe in an assembled state for ease of illustration.