title: Technique in direct venous valvuloplasty.
mesh_terms: D006801:Humans; D011138:Polytetrafluoroethylene; D013536:Suture Techniques; D014680:Veins / Q000601:surgery*; D014689:Venous Insufficiency / Q000601:surgery*
chemical_list: D011138:Polytetrafluoroethylene