POLITETRAFLUORETILENO RADIALMENTE EXPANDIBLE Y STENTS ENDOVASCULARES EXPANDIBLES FORMADOS CON ESTA MATERIA

MATERIALES PTFE TUBULARES RETIRADOS, EXTENDIDOS Y AGLOMERADOS (50), QUE HAN SIDO DILATADOS RADIALMENTE Y REAGLOMERADOS, SE PRODUCEN PARA SER USADOS EN EL AMBITO MEDICO, P.E. FORROS Y COBERTURAS CON ESTRUCTURAS DE SOPORTE (52) PARA STENTS ENDOVASCULARES EXPANSIBLES (48). LOS MATERIALES PTFE TIENEN UN REC ( COEFICIENTE DE EXPANSION RADIAL) Y UNA RER ( RATIO DE EXPANSION RADIAL ) INUSUALMENTE BAJOS, PERMITIENDO QUE LOS TUBOS PTFE DE PARED FINA SE EXPANDAN ENTRE UN 50% Y UN 400% O MAS, ANTES DE QUE DECAIGA LA FUERZA TENSIL. SE DESCRIBEN IMPLANTES MEDICOS EN FORMA DE TUBO QUE TIENEN TAL MATERIAL PTFE, METODOS PARA HACER DICHOS IMPLANTES, Y STENTS ENDOVASCULARES FORMADOS CON DICHOS IMPLANTES. Extruded, stretched, and sintered tubular PTFE materials (50), which have been radially dilated and resintered, are produced which are suited for use in the medical field, e.g., as liners and covers with support structures (52) for expandable endovascular stents (48). The PTFE materials have an unusually low REC (Radial Expansion Coefficient) and RER (Radial Expansion Ratio), permitting thin-walled PTFE tubes to expand about 50% to 400%, or more, before the decline and tensile strength. Tube-form medical implants comprising such PTFE material, methods for making such implants, and endovascular stents formed with such implants are described.