The tip of the catheter utilizes fiber optics to deliver laser energy to heat and seal off the vein. Sealing off the faulty vein does not adversely affect circulation because other veins assume management for blood return back to the heart. The treated vein shrinks and seals and is unlikely to reopen and cause a recurrence of symptoms. Your physician may prescribe compression stockings to enhance your comfort and request that you have a follow-up ultrasound exam in two to four weeks to ensure that the procedure was successful.