Abstract: A deflectable stylet is comprised of a hollow tube with a reduced diameter distal portion including a semi-cylindrical ground portion to provide localized flexure wherein tension is applied to an axial tension wire fixed to the distal end of the hollow tube. The hollow tube is coupled to a rotationally fixed tip coupled to a rotationally fixed handle body. The handle body and the tip are telescoped longitudinally with respect to each other along the longitudinal axis of the hollow tube by means of a rotatable nut that advances out of or backs the handle into the tip. The tension wire is coupled to the handle body so that when the nut is rotated in a first direction and the handle body backed out, tension is applied to the wire which is then withdrawn from the hollow tube fixed to the tip causing the stylet to curve at its distal end. Rotation of the nut in the opposite direction reduces the tension on the wire causing the stylet to straighten at its distal end.