Super elastic guidewire with shape retention tip
First Claim
Patent Images
1. An intravascular guidewire, comprising:
- an elongate core wire comprising a metal; and
a polymer jacket comprising a shape memory polymer surrounding a portion of the core wire, the polymer jacket being more stiff than the portion of the core wire which it surrounds.
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Accused Products
Abstract
A guidewire having a super elastic core surrounded by a shape memory polymer jacket. The super elastic core wire permits the guidewire to be navigated through tortuous vasculature without undergoing plastic deformation, and the shape memory polymer jacket permits the guidewire to be shaped by the physician.
167 Citations
33 Claims
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1. An intravascular guidewire, comprising:
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an elongate core wire comprising a metal; and
a polymer jacket comprising a shape memory polymer surrounding a portion of the core wire, the polymer jacket being more stiff than the portion of the core wire which it surrounds. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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- 15. An intravascular guidewire as in claim 1, wherein the shape memory polymer comprises shape memory styrene-butadiene copolymer.
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15-1. A method of shaping a guidewire, comprising the steps of:
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providing a guidewire comprising an elongate core wire with a shape memory polymer jacket surrounding a portion of the core wire;
deforming the polymer jacket and the portion of the core wire which it surrounds into a shape;
heating the deformed polymer jacket to a temperature at or above a glass transition temperature of the shape memory polymer; and
cooling the deformed polymer jacket to a temperature below the glass transition temperature of the shape memory polymer to maintain the shape.
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16-2. A method of shaping a guidewire as in claim 15, further comprising the steps of:
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deforming the polymer jacket and the portion of the core wire which it surrounds into a different shape;
reheating the deformed polymer jacket to a temperature at or above a glass transition temperature of the shape memory polymer; and
cooling the deformed polymer jacket to a temperature below the glass transition temperature of the shape memory polymer to maintain the different shape.
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18. An intravascular guidewire, comprising:
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an elongate core wire comprising a metal having an elastic limit; and
a polymer jacket surrounding a distal tip portion of the core wire, the polymer jacket comprising a polymer having an elastic limit, the polymer jacket being more stiff than the distal tip portion of the core wire which it surrounds such that when the tip is deformed into a shape within the elastic limit of the metal and beyond the elastic limit of the polymer, the tip substantially retains the shape. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification
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Current AssigneeBoston Scientific Scimed (Boston Scientific Corporation)
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Original AssigneeScimed Life Systems Incorporated (Boston Scientific Corporation)
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InventorsSahatjian, Ronald A., Griffin, Stephen
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current600/585
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CPC Class CodesA61L 2400/16 Materials with shape-memory...A61L 31/022 Metals or alloysA61L 31/10 Macromolecular materialsA61M 2025/09141 made of shape memory alloys...A61M 25/09 Guide wires
