SaphenionScience: VenaSeal varicose veins: Since 7 years we are working with VenaSeal (Medtronic, Minneapolis), a N-butyl -2 – cyanoacrylate in therapy of truncal varicose veins. Until to today time we treated 2384 truncal veins. The cyanoacrylat – polymer is a high effective vein glue for the treatment of patients with CVI and varicosie veins.As an implanted device, question is important: How long cyanoacrylate persists after using as a vein glue inside the truncal varicose veins.