| 摘要 |
An implant has a first region with greater longitudinal flexibility flanked by stiffer regions. The regions of the implant have the same radial stiffness. The implant may be an intracranial stent that has variable flexibility and may be formed from Nitinol. The stent (10) is formed from a plurality of stent rings (12) connected by tie bars (14a, 14b). The tie bars (14b) in a central soft zone (16) are heat treated so as to confer a higher transition temperature on the Nitinol. As a result, at body temperature, the soft zone (16) has reduced longitudinal stiffness as compared to the stiffer zones (18) found at the ends of the stent (10). |
