Instrument for use in surgery

A method of implanting a bone anchor into bone with a surgical instrument comprising a bone anchor insertion device that comprises a drive shaft configured to engage the bone anchor, the drive shaft defining a coaxial channel for receiving a needle therethrough, and an instrument comprising a hollow shaft connectable to the drive shaft in a rotationally fixed manner, a needle holder configured to hold a needle and movable axially relative to the hollow shaft, an actuator rotatable relative to the hollow shaft, and a transmission member connectable to the needle holder and movable axially relative to the actuator, wherein the transmission member is positionable around at least part of the hollow shaft and comprises a first advancement surface engageable with a second advancement surface of the hollow shaft to convert rotational movement of the actuator into axial movement of the needle holder relative to the hollow shaft for axially advancing and retracting the needle held by the needle holder relative to the hollow shaft, the method comprising:

• advancing a bone anchor to the bone while the bone anchor is engaged by the bone anchor insertion device and the bone anchor insertion device is connected to the instrument and when a needle is held by the needle holder and extends distally past a tip of the bone anchor;
• rotating the actuator while holding a rotational orientation of the hollow shaft to advance the needle into the bone while maintaining an axial position of the bone anchor;
• rotating the hollow shaft while holding a rotational orientation of the actuator to advance the bone anchor over the needle into the bone while maintaining an axial position of the needle;
• detaching the bone anchor insertion device and the needle from the bone anchor.

An instrument for use in surgery, the instrument being connectable to a bone anchor insertion device that comprises a drive shaft configured to engage a bone anchor, the drive shaft defining a coaxial channel for receiving a needle therethrough, the instrument comprising:

• a hollow shaft connectable to the drive shaft in a rotationally fixed manner;
• a needle holder configured to hold a needle and movable axially relative to the hollow shaft;
• an actuator rotatable relative to the hollow shaft;
• a transmission member connectable to the needle holder and movable axially relative to the actuator, the transmission member comprising a first advancement surface engageable with a second advancement surface of the hollow shaft to convert rotational movement of the actuator into axial movement of the needle holder relative to the hollow shaft for axially advancing and retracting the needle held by the needle holder relative to the hollow shaft;
• and
• a closed ring configured to extend entirely around at least part of the actuator, wherein the closed ring is fixedly connected to and movable together with the transmission member relative to the actuator.