Patent ID: 8881358

Claim:
A tool for assembling a bone anchoring device, the bone anchoring device comprising a bone anchoring element with a head and a shaft to be anchored in a bone and a receiving part comprising a receiving part body and a locking ring, the tool comprising: a first holder for holding the bone anchoring element; and a second holder for holding the receiving part, wherein the first and second holders are movable relative to each other, such that when the first holder is holding the bone anchoring element and the second holder is holding the receiving part, the movement between the first and second holders is configured to press the bone anchoring element against at least one of the receiving part body or the locking ring, and wherein at least one of the first holder or the second holder comprises an abutment device which is movable between a first position closer to the other one of the first holder or the second holder and a second position farther away from the other one of the first holder or the second holder, wherein when in the first position the abutment device is configured to resist movement of the receiving part body with respect to the second holder when the first holder is moved towards the second holder to engage the bone anchoring element with the receiving part body, wherein after engagement of the bone anchoring element with the receiving part body, the abutment device is configured to move from the first position to the second position while the second holder is configured to resist movement of the locking ring when the first holder is moved further towards the second holder such that a position of the locking ring relative to the bone anchoring element with the engaged receiving part body is adjusted, and wherein when the abutment device is in the second position, a pressure is applied on the abutment device to urge the abutment device towards the first position.