| abstract |
This invention is a stent comprising a skeletal frame (2) of thermal shape memory material which has been annealed at a temperature sufficient to set a memory shape. The frame (2) is adapted to assume a first condition in which the frame is relatively rigid and substantially tubular in configuration, and a second condition in which the frame is flexible, of reduced stress, and collapsible, such that in the second condition walls (6) of cells (18) of the frame are adapted to be positioned against each other to form a stent diameter substantially equal to the combined thickness of the frame walls in abutting engagement with each other. The cell walls (6) are joined by fusion welds formed before the frame (2) is annealed. |