The ornamental design for a handle for a surgicalinstrument, as shown and described.
FIG. 1 is a first side view of a handle for a surgical instrument, the opposite side view being symmetric-opposite to the first side view;
FIG. 2 is an elevated perspective view of the handle for a surgical grip of FIG. 1;
FIG. 3 is a first side view of an alternative embodiment of the handle for a surgical instrument, the opposite side view being symmetric-opposite to the first side view; and,
FIG. 4 is an elevated perspective view of the handle for the surgical grip of FIG. 3.
The portions of the handle for a surgical instrument shown in broken lines form no part of the claimed design.