Various embodiments are described herein for an extendable electrode configured to receive and conduct radiofrequency discharges for heating a target tissue site, a device for deploying the extendable electrode, and an apparatus for deploying the extendable electrode. Methods for use of the device and apparatus in radiofrequency ablation are described. In various embodiments, the extendable electrode is a coil electrode. Embodiments are described wherein the electrode, device, apparatus, and methods provide radiofrequency ablation treatment of intervertebral discs.
