Cannula Inserted After some anesthetic is injected to numb the area, a thin needle called a cannula is inserted through the back and into the herniated disc. The surgeon uses x-ray images to guide the placement of the cannula.
Disc Nucleus Treated A small radiofrequency probe is carefully inserted through the cannula and into the disc. The device sends pulses of radio waves to dissolve small portions of the disc nucleus. Because only enough of the disc is removed to reduce pressure inside the disc, the spine remains stable.