Patent ID: 7591845

Claim:
A stent for insertion into a target portion of an internal cavity for high frequency thermotherapy, comprising: a hollow cylindrical stent body fabricated by knitting first superelastic shape-memory alloy wires in such a manner that the first superelastic shape-memory alloy wires cross each other at different positions to form the hollow cylindrical stent body having a predetermined length and a net structure with a plurality of meshes, wherein the hollow cylindrical stent body has an insulating substance covering inner and outer surfaces of the hollow cylindrical stent body, and an expanded diameter of the hollow cylindrical stent body is greater at a first end and a second end than at a waist part corresponding to a central part of the hollow cylindrical stent body; and a hollow cylindrical conductive body surrounding only the waist part or a portion thereof such that a first end of the hollow cylindrical conductive body is attached to the waist part of the hollow cylindrical stent body, the hollow cylindrical conductive body being fabricated by knitting second superelastic shape-memory alloy wires in such a manner that the second superelastic shape-memory alloy wires cross each other at different positions, and an expanded diameter of the hollow cylindrical conductive body is such that the hollow cylindrical conductive body comes into contact with the internal cavity to expand the target portion of the internal cavity, wherein an external expanded diameter of the stent is constant therethroughout.