The ornamental design for a bipolarelectrosurgicalinstrument, as shown and described.
FIG. 1 is a front left side isometric view of a bipolar electrosurgical instrument in accordance with the new design;
FIG. 2 is a right side elevation view thereof, a left side elevation view being a mirror image thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a front elevation view thereof; and,
FIG. 6 is a rear elevation view thereof.
The broken lines shown in FIGS. 4 and 5 form no part of the claimed design. The broken away symbols in the drawings indicate that any portion of the article beyond what is shown forms no part of the claimed design.