| 摘要 |
An intravascular stent (208) especially suited for implanting in curved arterial portions (210). The stent (208) retains longitudinal flexibility after expansion. The stent (208) is formed of intertwined meander patterns (301,312) forming triangular cells (500). The triangular cells (500) are adapted to provide radial support, and also to provide longitudinal flexibility after expansion. The triangular cells (500) provide increased coverage of a vessel wall. The stent (208) can have different portions adapted to optimize radial support or to optimize longitudinal flexibility. Loops (304,306,316,318,320,322) in the stent are disposed and adapted to cooperate, so that after expansion of said stent (208) within a curved lumen (210), the stent (208) is curved and cells (500) on the outside of the curve (210) open in length, but narrow in width, whereas cells (500) on the inside of the curve (210) shorten in length, but thicken in width to maintain a density of the stent element area which is much more constant than otherwise between the inside and outsidc of the curve. As a result, when the stent is coated with a medicine, the more constant density of stent elements results in an even dose being applied to the inside wall of the lumen. <IMAGE> |
