Expandable slide and lock stent
First Claim
Patent Images
1. An expandable slide and lock stent, the stent comprising a body having a generally tubular shape with a central lumen, the body defining a longitudinal axis extending longitudinally along the body, the body comprising:
- at least first and second elongate backbones, each backbone comprising a plurality of slots extending through the backbone, each backbone extending in a generally helical path about the axis along at least a portion of the backbone, each of the at least first and second backbones being circumferentially offset from each adjacent backbone;
a plurality of first elongate members defining proximal and distal ends, the proximal ends of the plurality of first elongate members being coupled to the first backbone with the elongate members extending in a circumferential direction from the first backbone to slidably engage and extend through a corresponding set of slots of the second helical backbone, the first elongate members being axially offset from each other;
a first cross-member coupling the distal ends of the first plurality of elongate members;
a plurality of second elongate members defining proximal and distal ends, the proximal ends of the plurality of second elongate members being coupled to the second backbone and extending in a circumferential direction from the second backbone to slidably engage and extend through slots of an adjacent helical backbone, the second elongate members being axially offset from each other and from each of the first elongate members; and
a second cross-member coupling the distal ends of the second plurality of elongate members;
wherein the at least first and second helical backbones and the at least first and second plurality of elongate members interconnecting to collectively define the generally tubular body, the body being radially expandable and/or contractible upon sliding of the elongate members in the engaged slots, the radial expansion and or contraction of the body having a range of radial motion between a collapsed tube diameter and an expanded tube diameter, andwherein the body further comprises a locking mechanism configured to prevent radial contraction over at least a portion of the range of radial motion of the body.
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Abstract
An expandable slide and lock stent is provided that comprises a plurality of radial elements interconnected to form a tubular member. Each radial element can comprise a helical backbone and at least one elongate member extending from the helical backbone in a circumferential direction. Each backbone can have at least one slot that can be configured to receive an elongate member of an adjacent radial element.
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Citations
29 Claims
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1. An expandable slide and lock stent, the stent comprising a body having a generally tubular shape with a central lumen, the body defining a longitudinal axis extending longitudinally along the body, the body comprising:
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at least first and second elongate backbones, each backbone comprising a plurality of slots extending through the backbone, each backbone extending in a generally helical path about the axis along at least a portion of the backbone, each of the at least first and second backbones being circumferentially offset from each adjacent backbone; a plurality of first elongate members defining proximal and distal ends, the proximal ends of the plurality of first elongate members being coupled to the first backbone with the elongate members extending in a circumferential direction from the first backbone to slidably engage and extend through a corresponding set of slots of the second helical backbone, the first elongate members being axially offset from each other; a first cross-member coupling the distal ends of the first plurality of elongate members; a plurality of second elongate members defining proximal and distal ends, the proximal ends of the plurality of second elongate members being coupled to the second backbone and extending in a circumferential direction from the second backbone to slidably engage and extend through slots of an adjacent helical backbone, the second elongate members being axially offset from each other and from each of the first elongate members; and a second cross-member coupling the distal ends of the second plurality of elongate members; wherein the at least first and second helical backbones and the at least first and second plurality of elongate members interconnecting to collectively define the generally tubular body, the body being radially expandable and/or contractible upon sliding of the elongate members in the engaged slots, the radial expansion and or contraction of the body having a range of radial motion between a collapsed tube diameter and an expanded tube diameter, and wherein the body further comprises a locking mechanism configured to prevent radial contraction over at least a portion of the range of radial motion of the body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An expandable stent, the stent comprising a radially-expandable tubular body defining a longitudinal axis and comprising two or more slidable members disposed circumferentially adjacent to each other, each slidable member comprising:
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an elongate backbone extending longitudinally and having at least a portion thereof extending in a generally non-parallel direction relative to the longitudinal axis of the body, the backbone comprising a plurality of slots; a plurality of elongate members defining proximal and distal ends, the proximal ends of the elongate members being coupled to the backbone, each of the plurality of elongate members being axially offset from each other, each of the plurality of elongate members engaging a corresponding slot of the backbone of an adjacent slidable member so as to be slidably interconnected with the adjacent slidable member; wherein the tubular body defines a circumference which is expandable between a collapsed diameter and an expanded diameter, the two or more slidable members configured to provide one-way expansion from the collapsed diameter to the expanded diameter. - View Dependent Claims (13, 14, 15, 16)
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- 17. An expandable stent comprising a plurality of radial elements interconnected to form a tubular member, each radial element comprising a helical support member comprising a plurality of slots and a plurality of circumferential rails, wherein a first radial element is interconnected with a second radial element, such that the circumferential rails of the first radial element are received into the slots of the helical support member of the second radial element, the helical support member comprising a plurality of sections configured such that the helical support member extends in a discontinuous path, at least some of the plurality of sections extending generally transversely relative to a longitudinal axis of the tubular member such that the helical support member defines a generally helical overall path.
Specification