The ornamental design for a trocar, as shown and described.
FIG. 1 is a left side elevational view of a trocar in accordance with the new design, a right side elevational view, a top plan view and a bottom plan view being identical thereto;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a front left side isometric view thereof; and
FIG. 5 is a rear right side isometric view thereof.
FIG. 6 is a bottom plan view of a trocar in accordance with the new design;
FIG. 7 is a left side elevational view thereof, a right side elevational view being a mirror image thereof;
FIG. 8 is a top plan view thereof;
FIG. 9 is a front elevational view thereof;
FIG. 10 is a rear elevational view thereof;
FIG. 11 is a front left side isometric view thereof; and,
FIG. 12 is a rear right side isometric view thereof.