自1969年Dotter首次成功的动物实验报道以来,内支架的制作材料和工艺、类型和结构等已有不断改进更新,临床应用也从血管狭窄性病变的再通扩大到非血管(如食管、胆道、气道和尿道等)管腔狭窄性病变的姑息治疗、实质脏器的新通道建立以及动脉瘤的修补和血管移植术等。因此,狭义的血管内支架 Since the first successful animal experiment in Dotter in 1969, the material, process, type and structure of the stent have been continuously updated and updated. The clinical application has also been expanded from recanalization of vascular stenosis to non-vascular (such as esophagus and biliary tract , Airway and urethra, etc.) palliative treatment of stenotic stenosis, the establishment of new organs of the real organs and aneurysm repair and vascular grafting. Therefore, the narrow endovascular stent