We claim the ornamental design for an intramedullary surgical instrument, as shown and described.
FIG. 1 is a perspective view of an intramedullary surgical instrument showing our new design;
FIG. 2 is a front elevation view of the intramedullary surgical instrument of FIG. 1;
FIG. 3 is a rear elevation view of the intramedullary surgical instrument of FIG. 1;
FIG. 4 is a first side elevation view of the intramedullary surgical instrument of FIG. 1;
FIG. 5 is a second side elevation view of the intramedullary surgical instrument of FIG. 1;
FIG. 6 is a top plan view of the intramedullary surgical instrument of FIG. 1; and,
FIG. 7 is a bottom plan view of the intramedullary surgical instrument of FIG. 1.
The broken lines shown in the views are included for the purpose of illustrating portions of the intramedullary surgical instrument that form no part of the claimed design.