Instrument for use with a bone anchoring device

A system comprising:

• a receiving part for connecting a bone anchoring element to a rod, the receiving part comprising two legs that define a recess for receiving the rod;
• and
• an instrument comprising:
• a tube having a first end, a second end, and a longitudinal axis that extends between the first end and the second end, and defining a coaxial internal channel that opens towards the first end and the second end;
• and
• at least one protruding portion configured to extend at least partially into the recess of the receiving part when the instrument is attached to the receiving part to prevent rotational movement of the tube relative to the receiving part;
• wherein the first end of the tube forms a closed ring, and wherein the at least one protruding portion has a first region that extends radially outwardly from an outer surface of the tube at the first end and a second region that extends axially away from the first end in a direction opposite the second end.

A system comprising:

• a bone anchoring element comprising a shank and a head that defines a tool recess for a driving tool for driving the shank into bone;
• a receiving part for connecting the bone anchoring element to a rod, the receiving part comprising two legs that define a recess for receiving the rod;
• and
• an instrument comprising:
• a tube having a first end, a second end, and a longitudinal axis that extends between the first end and the second end, and defining a coaxial internal channel that opens towards the first end and the second end and that is sized to accommodate the driving tool therethrough to engage the tool recess on the head;
• and
• at least one protruding portion configured to extend radially outwardly from the tube into the recess of the receiving part when the instrument is attached to the receiving part to prevent rotational movement of the tube relative to the receiving part.