The ornamental design for a surgicalknife, as shown and described.
FIG. 1 is a front perspective view of a surgical knife showing my new design;
FIG. 2 is a front view thereof, the rear view being a mirror image of FIG. 2;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is an enlarged view of the portion indicated by line 6-6 in FIG. 1;
FIG. 7 is an enlarged view of the portion indicated by line 7-7 in FIG. 2;
FIG. 8 is an enlarged view of the portion indicated by line 8-8 in FIG. 3;
FIG. 9 is an enlarged view of the portion indicated by line 9-9 in FIG. 4; and,
FIG. 10 is an enlarged view of the portion indicated by line 10-10 in FIG. 5.
The features shown in broken lines in the drawings depict environmental subject matter only and form no part of the claimed design. The dashed-dotted lines denote the boundary of the claim and form no part of the claimed design.