We claim the ornamental design for a medical tablet computer stand, as shown and described.
FIG. 1 shows a perspective view of a medical tablet computer stand;
FIG. 2 shows a front view thereof;
FIG. 3 shows a right side view thereof;
FIG. 4 shows a left side view thereof;
FIG. 5 shows a top view thereof;
FIG. 6 shows a bottom view thereof; and,
FIG. 7 shows a back view thereof.
The dotted lines are for the purpose of illustrating portions of the medical tablet computer stand and form no part of the claimed design. The dashed lines on the surface portions indicate contour and not surface decoration.