1. A catheter comprising: a tubular element comprising an inner cavity and an outer surface, the tubular element comprising a metal spiral having a spiral gap and a polymer material housed in the spiral gap； an inner shell passing through the cavity of the tubular element and forming the inner cavity of the catheter； external coating on the outer surface of the tubular element； moreover, the polymeric material placed in the spiral gap is different from the materials of the inner shell and the outer coating. 2. The catheter according to claim 1, wherein the metal coil contains a nickel-titanium alloy. The catheter according to claim 1, wherein the metal coil comprises a nickel-titanium alloy tape. The catheter according to claim 1, wherein the helical gap has a constant width. The catheter according to claim 1, wherein the dimensions of the metal coil and / or the width of the spiral gap vary. The catheter according to claim 1, wherein the helical gap has a width of from about 0.001 inch (0.0254 mm) to about 0.0025 inch (0.0635 mm). The catheter according to claim 1, in which the polymeric material contains an elastomer. The catheter according to claim 1, wherein the polymeric material comprises molded polyurethane. The catheter according to claim 1, wherein the inner sheath comprises a tube having a thickness of from about 0.00025 inches (0.00635 mm) to about 0.001 inches (0.0245 mm). The catheter according to claim 1, in which the inner shell contains at least one material selected from the group consisting of: fluoropolymers； polytetrafluoroethylene (PTFE)； perfluoroalkoxyethylene (PFA) and a copolymer of tetrafluoroethylene with hexafluoropropylene. 11. The catheter according to claim 1, in which the inner shell contains polytetrafluoroethylene and has a thickness of1. Катетер, содержащий:трубчатый элемент, содержащий внутреннюю полость и внешнюю поверхность, причем трубчатый элемент содержит металлическую спираль, имеющую спиральный промежуток и полимерный матер
