| 摘要 |
An implant having capability to expand and contract radially through a range of diameters, with corresponding changes in the cross-sectional area of the lumen, said implant exhibiting a remembered configuration in which the diameter of the implant is at the low end of said range of diameters, such that the implant is prompted to change its configuration towards said remembered configuration, that is, towards a reduced diameter configuration, upon the imposition on the implant of outside stimulus; said implant being characterised by: a molecule distributed within its bulk volume that preferentially responds to an applied field that permeates said volume, wherein said applied field constitutes the outside stimulus, and the preferential response of the molecule provides the prompt on the implant to change to the said remembered configuration. |
