The ornamental design for a microablator, as shown and described.
FIG. 1 is a top isometric view of a microablator in accordance with the new design;
FIG. 2 is a left side view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a rear view thereof; and,
FIG. 7 is a front view thereof.
FIGS. 1–5 shown as broken in the middle and embraced with a bracket are to indicate that no particular length is claimed. The broken line showing in FIG. 6 is for illustration purposes only and forms no part of the claimed design.