Abstract: The feeler is placed in alignment with the axis of a pin or screw inlet hole of the wall of the nail and is mounted at the distal end of a driving rotating spindle, at least partially flexible, the distal end of the spindle bearing the tool being housed in a bore of a protruding sleeve carried by a sliding block between a disengagement position allowing the sliding of the head in the nail and an engagement position, with application to feelers intended to bore, in bone surgery, a transversal hole from a medullary channel.

Abstract: The present invention concerns a guiding, positioning and boring sensor, comprising a flexible shaft mounted in rotation and axially displaceable in a flexible sheath presenting an external diameter substantially smaller than the minimum diameter of the transverse cross section of the cavity defined in the intramedullary nail, the flexible shaft bearing at a distal end a boring head and at its proximal end a connecting device to a rotary motor whereas the sheath is integral through its distal end to a guiding and positioning unit provided with an internal passage that is connected to the bore of the sheath and presents a transverse cross-section identical to that of the bore.