Patent ID: 8540761
Filing Date: 2013-09-24
Classification: A61F

Abstract:
1. An expandable stent formed of a shape memory material comprising: an elongated tubular body; and at least one crown connected to a respective longitudinal end of said body, said crown including a plurality of unconnected arrowhead-shaped leaves, each leaf having a longitudinally extending outer frame which is separate from and unconnected to the outer frame of any of the other leaves, each outer frame further having a first end connected to said end of said body and a second free end, and wherein each leaf includes said outer frame and an inner frame situated within said outer frame, wherein said stent body comprises an annular ring constituting said end of said stent body to which said crown is connected, said annular ring defining a plurality of adjacent peaks situated around the circumference of said end of said stent body; and wherein said outer frame of each leaf includes two struts directly connected at one of their ends to a pair of non-adjacent peaks of said end annular ring, and wherein said inner frame of each leaf includes two struts directly connected at one of their ends to respective intermediate peaks situated between said non-adjacent peaks of said end annular ring, wherein said stent material is trained to exhibit two-way shape memory properties such that when the stent is cooled in a predetermined temperature range, said free ends of said leaves move radially inwardly into proximity with each other, wherein the plurality of leaves are trained to have greater two-way shape memory effect than the elongated tubular body, and wherein said stent body comprises a plurality of interconnected closed-cell rings and Z-rings, and the end ring of said stent body to which said crown is connected comprises a closed-cell ring.