Expandable stent and method for delivery of same
DCFirst Claim
1. An expandable stent comprising:
- a proximal end and a distal end in communication with one another,a tubular wall disposed between the proximal end and the distal end, the tubular wall having a longitudinal axis and a porous surface defined by a plurality intersecting members arranged to define a first repeating pattern comprised of a polygon having;
(i) a pair of side walls substantially parallel to the longitudinal axis,(ii) a single concave-shaped first end wall having a first apex, and(iii) a single convex-shaped second end wall having a second apex, the concave-shaped first end wall and the convex-shaped second end wall connecting the side walls, at least one of the first apex and the second apex being substantially flat, the stent being expandable from a first, contracted position to a second, expanded position upon the application of a radially outward force on the stent;
wherein each side wall (i) is connected to a corresponding end wall portion that is substantially orthogonal to the longitudinal axis, and (ii) comprises at least a flex member connected to at least one straight segment disposed substantially parallel to the longitudinal axis, the flex member comprising a curved shape, which curves in a non-radial direction of the stent.
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Abstract
An expandable stent having a proximal end and a distal end in communication with one another, and a tubular wall disposed between the proximal end and the distal end. The tubular wall has a longitudinal axis and a porous surface defined by a plurality of intersecting members comprising a series of longitudinal struts disposed substantially parallel to the longitudinal axis of the stent. Each longitudinal strut in the series comprises flexure members for substantially complementary extension and compression of a diametrically opposed pair of the longitudinal struts upon flexure of the stent. The flexure members may comprise first and second curved sections which are of a different size. At least one of the curved sections may comprise an arc of greater than about 180°.
217 Citations
25 Claims
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1. An expandable stent comprising:
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a proximal end and a distal end in communication with one another, a tubular wall disposed between the proximal end and the distal end, the tubular wall having a longitudinal axis and a porous surface defined by a plurality intersecting members arranged to define a first repeating pattern comprised of a polygon having; (i) a pair of side walls substantially parallel to the longitudinal axis, (ii) a single concave-shaped first end wall having a first apex, and (iii) a single convex-shaped second end wall having a second apex, the concave-shaped first end wall and the convex-shaped second end wall connecting the side walls, at least one of the first apex and the second apex being substantially flat, the stent being expandable from a first, contracted position to a second, expanded position upon the application of a radially outward force on the stent; wherein each side wall (i) is connected to a corresponding end wall portion that is substantially orthogonal to the longitudinal axis, and (ii) comprises at least a flex member connected to at least one straight segment disposed substantially parallel to the longitudinal axis, the flex member comprising a curved shape, which curves in a non-radial direction of the stent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An unexpanded stent comprising:
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a tubular wall having a series of undulating circumferential portions, each circumferential portion comprising alternating peaks and valleys; the tubular wall also having a plurality of longitudinal portions connecting said series of undulating circumferential portions to form a porous, cylindrical surface; a longitudinal portion of said plurality of longitudinal portions connecting a peak in a first circumferential portion with a valley in a second circumferential portion adjacent to the first circumferential portion; and each of said plurality of longitudinal portions having a single flexure member interposed between a pair of straight strut portions which are disposed parallel to a longitudinal axis of the stent, the flexure member, comprises a U-shape curving in a non-radial direction of the stent. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. An unexpanded stent comprising:
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a tubular wall having a series of undulating circumferential portions, each circumferential portion comprising alternating peaks and valleys; the tubular wall also having a plurality of longitudinal portions connecting said series of undulating circumferential portions to form a porous, cylindrical surface; a longitudinal portion of said plurality of longitudinal portions connecting a peak in a first circumferential portion with a valley in a second circumferential portion adjacent to the first circumferential portion; and each of said plurality of longitudinal portions having a flexure member interposed between a pair of straight strut portions which are disposed parallel to a longitudinal axis of the stent, the flexure member, in two dimensions, comprising a U-shape, wherein the porous, cylindrical surface comprises a repeating pattern comprised of a polygon having a pair of side walls substantially parallel to a stent longitudinal axis, wherein the polygon further comprises a first wall having a concave shape and a second wall having a convex shape, wherein the flexure member is disposed in each of the side walls, and wherein at least one of the first wall and the second wall has a flat apex and the other of the first wall and the second wall has a rounded apex. - View Dependent Claims (20)
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21. An unexpanded stent comprising:
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a tubular wall comprising; (i) a series of undulating circumferential portions, each circumferential portion comprising alternating peaks and valleys, and (ii) a plurality of longitudinal portions connecting said series of undulating circumferential portions to form a porous, cylindrical surface comprising a repeating pattern comprised of a polygon having a pair of side walls substantially parallel to a stent longitudinal axis, and wherein a flexure member is disposed in each of the side walls, the polygon further comprising a first wall having a concave shape and a second wall having a convex shape, at least one of the first wall and the second wall having a flat apex, and the other of the first wall and the second wall having a rounded apex, the flat apex comprising a pair of rounded shoulders; a longitudinal portion connecting a peak in a first circumferential portion with a valley in a second circumferential portion adjacent to the first circumferential portion; and each of said plurality of longitudinal portions having a curved flexure member that provides lateral flexibility to said stent and is disposed within each of said plurality of longitudinal portions, each said flexure member, in two dimensions, comprising a pair of substantially straight strut portions disposed substantially orthogonal to a longitudinal axis of the stent, the pair of substantially straight strut portions being interconnected by a curved portion. - View Dependent Claims (22, 23, 24, 25)
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Specification