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Structure of the polytetrafluoroethylene membrane-covered self-expandable metallic (UVENTA) stents. (A) Both ends are fully covered with polytetrafluoroethylene membrane. (B) The flexibility of the UVENTA stent is shown. (C) The 2 metallic meshes (outer & inner) with the polytetrafluoroethylene membrane between them. (D) Cystoscopic view of the UVENTA stent after deployment in the trans-uretero-vesical junction. (E) Components of the inner sheath.
