Nesting twisting hinge points in a bifurcated petal geometry
First Claim
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1. A stent having an unexpanded state and an expanded state, the stent comprising:
- a generally tubular stent body defining a first circumferential plane, the stent body defining a first lumen with a first longitudinal axis extending therethrough, the stent body further defining at least one side opening having a perimeter, the at least one side opening in fluid communication with the first lumen; and
a side branch assembly, the side branch assembly comprising at least two petals engaged to the stent body adjacent to the at least one side opening, in the unexpanded state, the at least two petals being positioned substantially within the first circumferential plane, in the expanded state the at least two petals extending above the first circumferential plane and defining a second lumen with a second longitudinal axis extending therethrough, the second longitudinal axis intersecting and forming an oblique angle with the first longitudinal axis,wherein at least one of the at least two petals comprises a first expansion petal having a base, a tip, and two halves, the first half having a first straight segment and a second straight segment, a first ductile bend and a second ductile bend, and the second half having a third straight segment, a fourth straight segment, and a third ductile bend, the first and second halves being connected to one another at the base, the base being located closer to the side opening perimeter than the tip;
in the unexpanded state, the first, second, and third ductile bends each have a first end, a second end, and a curved region between the first and second ends, the first end being located at a position closer to the side opening perimeter than the second end, wherein each of the first, second, and third ductile bends is radially offset from the other of the ductile bends when the first expansion petal is in the unexpanded state;
in the expanded state the ductile bends assuming a twisted configuration and defining a generally rounded translational arc between the base and the tip.
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Abstract
A bifurcated stent that uses turning segments to reduce the strain at regions which bend at extreme angles. The turning segments can be placed on side branch petals or on connectors connecting the petals to the stent body. Combining the turning segments with connectors of different length and tethers provides for a stent with high flexibility that can accommodate various shaped body vessels. This design allows the bifurcation branch to extend easily, to a useful distance, and to be deployed along oblique angles. Best of all, this design avoids the problems of angularly strained side branch.
209 Citations
15 Claims
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1. A stent having an unexpanded state and an expanded state, the stent comprising:
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a generally tubular stent body defining a first circumferential plane, the stent body defining a first lumen with a first longitudinal axis extending therethrough, the stent body further defining at least one side opening having a perimeter, the at least one side opening in fluid communication with the first lumen; and a side branch assembly, the side branch assembly comprising at least two petals engaged to the stent body adjacent to the at least one side opening, in the unexpanded state, the at least two petals being positioned substantially within the first circumferential plane, in the expanded state the at least two petals extending above the first circumferential plane and defining a second lumen with a second longitudinal axis extending therethrough, the second longitudinal axis intersecting and forming an oblique angle with the first longitudinal axis, wherein at least one of the at least two petals comprises a first expansion petal having a base, a tip, and two halves, the first half having a first straight segment and a second straight segment, a first ductile bend and a second ductile bend, and the second half having a third straight segment, a fourth straight segment, and a third ductile bend, the first and second halves being connected to one another at the base, the base being located closer to the side opening perimeter than the tip; in the unexpanded state, the first, second, and third ductile bends each have a first end, a second end, and a curved region between the first and second ends, the first end being located at a position closer to the side opening perimeter than the second end, wherein each of the first, second, and third ductile bends is radially offset from the other of the ductile bends when the first expansion petal is in the unexpanded state; in the expanded state the ductile bends assuming a twisted configuration and defining a generally rounded translational arc between the base and the tip. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A stent having an unexpanded state and an expanded state, the stent comprising:
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a generally tubular stent body defining a first circumferential plane, the stent body defining a first lumen with a first longitudinal axis extending therethrough, the body further defining at least one side opening having a perimeter, the at least one side opening in fluid communication with the first lumen; and a side branch assembly adjacent to the side opening, the side branch assembly comprising at least two connectors and at least two petals, the at least two connectors each connecting one of the at least two petals to the stent body, in the unexpanded state, at least one of the at least two connectors having at least one ductile connector bend and the at least two petals being positioned substantially within the first circumferential plane, in the expanded state the at least two petals extending above the first circumferential plane and defining a second lumen with a second longitudinal axis extending therethrough and forming an oblique angle with the first longitudinal axis, wherein each of the at least two petals having comprises a base, a tip, and two halves, the first half having a first straight segment and a second straight segment, a first ductile petal bend and a second ductile petal bend, and the second half having a third straight segment, a fourth straight segment, and a third ductile petal bend, the first and second halves being connected to one another at the base; the at least one ductile connector bend comprising at least one curved region being between a first end and a second end, the first end being located at a position on the connector closer to the perimeter of the side branch opening point than the second end; in the expanded state the connector assuming a twisted configuration and defining an at least partially rounded translational arc between the stent body and the petal. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification