| 摘要 |
-19- A preferred embodiment of a stent provides a folded strut section that provides both structural rigidity and reduction in foreshortening of the ste nt mechanism. A flexible section provides flexibility for delivery of the stent mechanism. In a second embodiment, flexible section columns are angled with respect to each other, and to the longitudinal axis of the stent. These relatively flexible sections are oppositely phased in order to negate any torsion along their length. In yet another embodiment, the flexible connecto r can take on an undulating shape (like an "N"), but such that the longitudina l axis of the connector is not parallel with the longitudinal axis of the sten t. Finally, a new method is disclosed for making stents. The method consists of performing a standard photochemical machining process of cutting, cleaning and coating the tube with a photoresist. However, unlike former methods, the photoresist image is developed on the surface of the cylindrical metallic tube, which results in a controlled variable etching rate at selected sites on the cylindrical metallic tube during the etching process. Further embodiments provide living hinge connectors and connections along the length of the radi al strut member. |
