The ornamental design for a vacuumsplint, as shown and described.
FIG. 1 is a front view of the vacuum splint;
FIG. 2 is a left side view;
FIG. 3 is a back view; and,
FIG. 4 is a top view thereof.
The surface treatments consisting of small squares and broken hatched lines are understood to extend uniformly across the surfaces of which they are applied.