FIG. 1 is a right side elevational view of an endoscopic surgical instrument handle showing our new design, the broken line showing of the tubular shaft is for illustrative purposes only and forms no part of the claimed design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.