Apparatus described herein includes a tube, shaped todefine a tube lumen and including a distal portion that has aplurality of articulated sections. Theapparatus furtherincludes a ribbon that passes longitudinally through the tubelumen and is connected to a distalmost one of the articulatedsections, and a control handle disposed at a proximal end ofthe tube, the control handle being configured to flex thedistal portion of the tube by pulling the ribbon. Otherembodiments are also described.
