| 摘要 |
PROBLEM TO BE SOLVED: To facilitate the obtaining of a desired rigidity and a localization, and prevent a positional slip at a self-retaining region from arising by a method wherein a grille-forming beam to form a grille at the time of diameter contraction is formed into a flat shape which goes along a grille-form cylindrical, surface, and the grille- forming beam is formed in such a manner that the grille-forming beam may be cut- erect-crossed to the cylindrical surface. SOLUTION: A TiNi alloy sheet which is a shape-memory alloy sheet, is cut-worked and formed into a grille-shape, and a beam of the grille is formed into a flat surface- shape. Then, the sheet is rolled into a cylindrical shape of a first diameter D1 and retained to make a first cylinder 1, and after mechanically expanding the cylinder to a cylinder of a second diameter, a heat-treated and fixed second cylinder is formed. In this case, the first cylinder 1 of the first diameter D1 becomes the dimension with a contracted diameter of this stent which is housed in a catheter, and the second cylinder of the second diameter is made slightly larger than the internal diameter of an indwelling region or a windpipe. The stent which is diameter-contracted in icy water is restored to the original diameter by expanding a baloon at a constriction region, and at the same time, a blood vessel expansion and the expansion-retaining are performed. |
