Insert for a tool for assembling a bone anchoring device and tool for assembling a bone anchoring device

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, the tool comprising:

• a first holder configured to hold a bone anchoring element;
• a second holder configured to hold a receiving part;
• and
• an insert configured to be positioned in the first holder, the insert having an elongate body with a longitudinal axis, and having a first recess and a second recess each configured to receive a shaft of a bone anchoring element, wherein the first and second recesses each extend on a surface of the elongate body along the longitudinal axis, have different diameters, and are oriented in different radial directions relative to the longitudinal axis.

A method for assembling a bone anchoring device with a tool, 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, the tool comprising a first holder configured to hold a bone anchoring element, a second holder configured to hold a receiving part, and an insert configured to be positioned in the first holder, the insert having an elongate body with a longitudinal axis, and having a first recess and a second recess each configured to receive a shaft of a bone anchoring element, wherein the first and second recesses each extend on a surface of the elongate body along the longitudinal axis, have different diameters, and are oriented in different radial directions relative to the longitudinal axis, the method comprising:

• adjusting the insert to select the first recess or the second recess, wherein the selected recess has a diameter that is greater than a diameter of the shaft of the bone anchoring element;
• inserting the bone anchoring element in the first holder such that the shaft is positioned in the selected recess;
• inserting the receiving part in the second holder;
• actuating the tool from a first configuration towards a second configuration to insert the head of the bone anchoring element into the receiving part;
• and
• removing the attached bone anchoring element and receiving part from the tool.