Retractable sheath devices, systems, and methods
First Claim
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1. A medical device comprising:
- an expandable member having an outer surface; and
a sheath comprising a neckable element having a flattened form along the outer surface of the expandable member, the neckable element being a distinctive layer of material which has a width defined by edges of the distinctive layer of material such that when said distinctive layer of material is helically or circumferentially wrapped around said expandable member in an unexpanded state, the edges of said distinctive layer of material are overlapping or touching one another,wherein when said expandable member expands to the expanded state, the expandable member causes the neckable element to lengthen and the width of the distinctive layer to reduce such that the edges of said distinctive layer of material separate from one another, thereby exposing at least a portion of said outer surface.
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Abstract
The invention is directed to delivery medical devices that enable consistent “on-demand” delivery of therapeutic agents to a vessel. The medical device of the current invention comprises retractable sheath comprising neckable elements. The design and methods disclosed herein ensures that therapeutic agent delivery occurs essentially only upon necking of the outer sheath, minimizing coating and/or therapeutic agent loss to the bloodstream and providing controlled delivery to the treatment site.
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Citations
20 Claims
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1. A medical device comprising:
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an expandable member having an outer surface; and a sheath comprising a neckable element having a flattened form along the outer surface of the expandable member, the neckable element being a distinctive layer of material which has a width defined by edges of the distinctive layer of material such that when said distinctive layer of material is helically or circumferentially wrapped around said expandable member in an unexpanded state, the edges of said distinctive layer of material are overlapping or touching one another, wherein when said expandable member expands to the expanded state, the expandable member causes the neckable element to lengthen and the width of the distinctive layer to reduce such that the edges of said distinctive layer of material separate from one another, thereby exposing at least a portion of said outer surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 14, 15, 16, 17, 18, 19, 20)
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8. A method of delivering a therapeutic agent to a desired location within a vessel or an implanted endoprosthesis, comprising:
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inserting a catheter in a vessel, said catheter comprising; an expandable member comprising a coating with a therapeutic agent; and a sheath disposed on said expandable member, wherein said sheath comprises at least one neckable element having a flattened form along the expandable member and comprising a strip of material which has a width defined by edges of the strip material such that when said strip of material is helically or circumferentially wrapped around said expandable member in an unexpanded state, the edges of said strip of material are overlapping or touching one another, wherein said coating is disposed interior to the sheath; advancing said catheter to a desired location within said vessel; and expanding the expandable member at the desired location within said vessel such that the expandable member causes said at least one neckable element to lengthen and the width of said strip of material to reduce such that the edges of said strip of material separate from one another, thereby exposing at least a portion of said coating. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification