An end effector for use in an endoscopic device. The end effector includes a cup having a longitudinally extending median plane and opposite side walls extending on opposite sides of the median plane. Each of the side walls extends between a front end and a back end. Each of the side walls is spaced a first distance from the median plane at a position between the front end and the back end and spaced a second distance from the median plane different from the first distance at the front end. The cup also has an end wall extending across the front ends of the side walls.