Stent having struts with reverse direction curvature
First Claim
1. A stent, comprising:
- a plurality of interconnected circumferential bands defining a cylindrical structure having a longitudinal axis;
each of the circumferential bands having a generally serpentine pattern and comprising a plurality of struts and a plurality of loops, wherein each end of a strut is coupled to an end of a loop;
at least one of the circumferential bands having at least two consecutive struts comprising a plurality of arcuate sections, wherein each arcuate section in each strut has reverse curvature of opposing arcuate sections extending from each end to the mid-section of the strut wherein the plurality of arcuate sections in the strut substantially straighten during compression of the stent;
wherein each strut with arcuate sections has a cross-sectional area that is larger at the strut ends than in the midsection of the strut;
said adjacent struts having varying lengths to produce axially offset positions of adjacent loops.
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Accused Products
Abstract
Disclosed is a stent having struts with reverse direction curvature for providing a reduced compressed profile and an increased expanded profile. The strut configuration comprises a plurality of arcuate sections facing in opposite convex and a concave orientation. The strut width may be gradually decreased from its ends towards the strut'"'"'s mid-section to redistribute maximal strains away from portions of the stent more susceptible to permanent deformation, such as the loop portions. Varying strut lengths to offset the maximum circumferential widths of adjacent portions of the stent may further reduce the compressed stent profile. The varied stent lengths may also contribute to an increased expanded stent profile. Stents with the reverse direction curvature strut design can obtain an expanded to compressed stent diameter ratio of about 7:1 compared to conventional stents that have a ratio of up to about 5:1. The curved strut can be utilized with any stent design.
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Citations
22 Claims
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1. A stent, comprising:
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a plurality of interconnected circumferential bands defining a cylindrical structure having a longitudinal axis; each of the circumferential bands having a generally serpentine pattern and comprising a plurality of struts and a plurality of loops, wherein each end of a strut is coupled to an end of a loop; at least one of the circumferential bands having at least two consecutive struts comprising a plurality of arcuate sections, wherein each arcuate section in each strut has reverse curvature of opposing arcuate sections extending from each end to the mid-section of the strut wherein the plurality of arcuate sections in the strut substantially straighten during compression of the stent; wherein each strut with arcuate sections has a cross-sectional area that is larger at the strut ends than in the midsection of the strut; said adjacent struts having varying lengths to produce axially offset positions of adjacent loops. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A stent, comprising:
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a plurality of interconnected circumferential bands defining a cylindrical structure having a longitudinal axis; each of the circumferential bands having a generally serpentine pattern and comprising a plurality of struts and a plurality of loops, wherein each end of a loop is coupled to an end of two adjacent struts; at least one circumferential band having consecutive struts comprising a plurality of arcuate sections, wherein each arcuate section in each strut has reverse curvature of opposing arcuate sections extending from each end to the mid-section of the strut and each strut has a varying width wherein the width at ends of the strut are larger than the width of the remainder of the strut; wherein the plurality of arcuate sections in the strut substantially straighten during compression of the stent; wherein each strut with arcuate sections has a cross-sectional area that gradually decreases in opposing directions from the ends of the strut, the ends of the strut having greater cross-sectional area than the mid-section of the strut; said adjacent struts having varying lengths which result in axially offset adjacent loops. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A stein defining a cylindrical structure having a longitudinal axis comprising a plurality of cells, each of the plurality of cells comprising:
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a first circumferential section having a generally serpentine pattern and comprising a plurality of struts and at least one loop, the struts and loops forming at least one set of two struts coupled to the ends of one loop; a second circumferential section having a generally serpentine pattern and comprising a plurality of struts and at least one loop; at least one of the sets of the first circumferential section having two consecutive struts comprising a plurality of arcuate sections, wherein each arcuate section has reverse curvature of opposing arcuate sections extending from each end to the mid-section of the strut, and each strut has a varying width wherein the width at ends of each strut are larger than the width of the remainder of the same strut and the loop has a greater width than each strut; wherein the plurality of arcuate sections in the strict substantially straighten during compression of the stent; wherein each strut with arcuate sections has a cross-sectional area that gradually decreases in opposing directions from the ends of the strut, the ends of the strut having greater cross-sectional area than the mid-section of the strut; said adjacent struts having varying lengths which result in axially offset adjacent loops. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification