Expandable medical device with improved spatial distribution
First Claim
1. An expandable medical device comprising:
- a plurality of elongated struts, the plurality of elongated struts joined together to form a substantially cylindrical device which is expandable from a cylinder having a first diameter to a cylinder having a second diameter, wherein adjacent ones of the plurality of elongated struts are substantially parallel when the cylinder is at the first diameter and the adjacent elongated struts form V-shapes when the cylinder is at the second diameter; and
a plurality of pivots joining the plurality of struts together in the substantially cylindrical device, wherein only one pivot interconnects each two adjacent elongated struts and the pivots are each located offset from a line bisecting the V-shapes formed by the elongated struts when the cylinder is at the second diameter.
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Accused Products
Abstract
An expandable medical device having a plurality of elongated struts, the plurality of elongated struts being joined together by ductile hinges to form a substantially cylindrical device which is expandable from a cylinder having a first diameter to a cylinder having a second diameter. The plurality of struts and ductile hinges are arranged to improve the spatial distribution of the struts which is particularly important when delivering beneficial agents with the struts. The improved strut arrangement expands to a substantially parallelogram shape for improved beneficial agent distribution to the surrounding tissue. A beneficial agent may be loaded into openings within the struts or coated onto the struts for delivery to the tissue.
370 Citations
40 Claims
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1. An expandable medical device comprising:
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a plurality of elongated struts, the plurality of elongated struts joined together to form a substantially cylindrical device which is expandable from a cylinder having a first diameter to a cylinder having a second diameter, wherein adjacent ones of the plurality of elongated struts are substantially parallel when the cylinder is at the first diameter and the adjacent elongated struts form V-shapes when the cylinder is at the second diameter; and
a plurality of pivots joining the plurality of struts together in the substantially cylindrical device, wherein only one pivot interconnects each two adjacent elongated struts and the pivots are each located offset from a line bisecting the V-shapes formed by the elongated struts when the cylinder is at the second diameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An expandable medical device comprising:
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a plurality of elongated struts, the plurality of elongated struts joined together to form a substantially cylindrical device which is expandable from a cylinder having a first diameter to a cylinder having a second diameter, wherein adjacent ones of the plurality of elongated struts are substantially parallel when the cylinder is at the first diameter and the adjacent elongated struts form V-shapes when the cylinder is at the second diameter; and
a plurality of ductile hinges connecting the plurality of struts together in the substantially cylindrical device, wherein only one ductile hinge interconnects each two adjacent elongated struts and the ductile hinges are each located offset from a line bisecting the V-shapes formed by the elongated struts when the cylinder is at the second diameter, the ductile hinges having a hinge width which is smaller than a strut width such that as the device is expanded from the first diameter to the second diameter the ductile hinges experience plastic deformation while the struts are not plastically deformed. - View Dependent Claims (10, 11, 12, 13, 14)
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15. An expandable medical device comprising:
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a plurality of struts each having a long leg, a short leg connected to the long leg, and a connecting point, wherein the long leg has a length longer than a length of the short leg;
a plurality of pivots joining the long leg of one strut to the short leg of an adjacent strut to form a substantially cylindrical device which is expandable from a cylinder having a first diameter to a cylinder having a second diameter, wherein as the substantially cylindrical device is expanded from the first diameter to the second diameter the pivots bend; and
a plurality of bridging members connected to the connecting points of struts in one row and to the connecting points of struts in an adjacent row to form an expandable device configured such that a total length of the bridging members remains substantially constant during radial expansion. - View Dependent Claims (16, 17, 18, 19)
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20. An expandable medical device comprising:
a plurality of elongated struts, the plurality of elongated struts joined together by pivoting connections to form a substantially cylindrical device which is expandable from a cylinder having a first diameter to a cylinder having a second diameter, wherein adjacent ones of the plurality of elongated struts are substantially parallel when the cylinder is at the first diameter and the adjacent elongated struts form a plurality of substantially parallelogram shapes when the cylinder is at the second diameter, the substantially parallelogram shapes having first and second opposite sides which are longer than third and fourth opposite sides. - View Dependent Claims (21, 22, 23, 24)
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25. An expandable medical device for delivery of a beneficial agent, the device comprising:
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a plurality of elongated struts, the plurality of elongated struts joined together by pivoting connections to form a substantially cylindrical device which is expandable from a cylinder having a first diameter to a cylinder having a second diameter, wherein adjacent ones of the plurality of elongated struts are substantially parallel when the cylinder is at the first diameter and the adjacent elongated struts form a plurality of substantially parallelogram shapes when the cylinder is at the second diameter, the substantially parallelogram shapes having first and second opposite sides which are longer than third and fourth opposite sides;
a beneficial agent affixed to the plurality of struts for delivery to tissue. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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33. An expandable medical device comprising:
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a plurality of elongated struts;
a plurality of ductile hinges connecting the plurality of struts together in a substantially cylindrical medical device which is expandable from a cylinder having a first diameter to a cylinder having a second diameter, wherein the plurality of ductile hinges are tapered with the taper oriented to achieve uniform strain along the ductile hinge during expansion of the cylinder from the first diameter to the second diameter. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40)
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Specification