VenaSeal treats the underlying causes of varicose veins without the need for surgery. A catheter is inserted into specific areas along the diseased vein. After the catheter is positioned, it delivers small amounts of VenaSeal medical glue (chemically called cyanoacrylate). After the appropriate amount of VenaSeal glue is administered, the catheter is removed and a bandage is placed over the puncture site. Once the impacted vein is closed, blood is immediately re-routed through other healthy veins.