Handling instrument for a bone anchor

Handling instrument for a bone anchor, in particular a bone screw, in particular a pedicle screw in spinal surgery, the instrument being detachably, but also rigidly and non-rotatably, connectable to a head of the bone anchor and extending in an axial longitudinal direction, said instrument comprising a first outer housing part extending in the longitudinal direction and a second inner housing part which extends in the longitudinal direction and can be inserted into the first outer housing part in the longitudinal direction, the housing parts being tubular or sleeve-shaped, at least in sections, and the first outer housing part including an internal thread which extends in the longitudinal direction, and the second inner housing part including an external thread which extends in the longitudinal direction and can be screwed into the internal thread, the first outer housing part engaging behind the head of the bone anchor in the longitudinal direction, and the second inner housing part, when screwed in, being supported against the head of the bone anchor in the longitudinal direction such that the instrument can thus be detachably fastened to the head of the bone anchor, characterized in that the first outer housing part includes a threadless section in the region of the internal thread, which section extends distally from a proximal longitudinal end of the internal thread in the longitudinal direction and over an angular segment in a circumferential direction, and in that the external thread of the second inner housing part is formed, from a distal longitudinal end of the external thread, only in the region of the extension of the threadless section of the first outer housing part such that the second inner housing part can be plugged into the first outer housing part in the longitudinal direction in a translational manner at a suitable rotational position until the distal longitudinal end of the external thread comes into contact with a distal end of the threadless section, and can subsequently be screwed into the internal thread of the first outer housing part.