In another alternative embodiment, illustrated by articulating cannula 700B in FIG. 7B, the endoscopic cannula is constructed of a flexible material, such as flexible plastic (polyethylene, polyurethane, polytetrafluroroethylene, or the like) and its tip 708 is articulable, for example, with the aid of a wire 720 running through a separate wire lumen 724 to the distal end of the device, as shown i