Figure 1.

(a) The reusable drill (black asterisk) is enclosed in a sterile cover provided with the needle tray. The coaxial outer cannula (black arrowhead) and inner needle (white arrowhead) are locked and ready to engage with the drill. (b) The outer cannula (black arrowhead) and inner needle (white arrowhead) have been unlocked and the inner needle partially removed. (c) The outer cannula and inner needle are locked and engaged with the drill. The right hand is holding the drill and depressing a trigger that causes the locked outer cannula and inner needle to rotate. The left hand is helping to guide the trajectory of the coaxial cannula and needle. A piece of gauze is held in the left hand to prevent the glove from being “wound up” around the rotating outer cannula. (d) The inner needle has been unlocked and removed from the outer cannula and replaced with a K-wire. The outer cannula of the OnControl system can now be exchanged over the K wire for the outer cannula of the tumor ablation system.