During the procedure, the doctor will apply a topical anesthetic cream over the area of varicose veins. The site of catheter insertion is numbed by a local anesthetic agent. Your doctor uses an ultrasound probe to view and track the procedure in the enlarged vein. Under the guidance of ultrasound, a catheter is inserted through a small incision in the skin and is positioned into the abnormal vein. A radiofrequency electrode is then moved through the catheter exposing the tip of the electrode at the site to be treated. After injecting the area of abnormal vein with local anesthetic, radiofrequency energy is applied at the site to seal the vein. Your doctor will apply pressure to prevent bleeding and the incised opening is covered with a bandage.