Mechanism to improve stent securement
First Claim
Patent Images
1. A device for preventing stent movement during delivery comprising:
- a securement connector arranged to engage an outer surface of a catheter;
at least one flexible connecting member made from a shape memory material, said flexible connecting member comprising a serpentine band, said shape memory material having an Af temperature lower than normal human body temperature, said at least one flexible connecting member being balloon expandable, said flexible connecting member having a first end portion and a second end portion, the first end portion coupled to said securement connector; and
a locking member located at said flexible connecting member second end portion arranged to engage a portion of a stent;
wherein a diameter of the securement connector remains constant during stent expansion.
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Accused Products
Abstract
The present invention comprises a securement member to improve securement of a stent upon an expandable balloon and delivery catheter, and to constrain portions of the stent before and during stent deployment. Generally, the securement member comprises a securement connector arranged to engage a catheter, at least one flexible connecting member coupled to the securement connector, and a locking member arranged to engage a portion of a stent.
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Citations
21 Claims
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1. A device for preventing stent movement during delivery comprising:
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a securement connector arranged to engage an outer surface of a catheter; at least one flexible connecting member made from a shape memory material, said flexible connecting member comprising a serpentine band, said shape memory material having an Af temperature lower than normal human body temperature, said at least one flexible connecting member being balloon expandable, said flexible connecting member having a first end portion and a second end portion, the first end portion coupled to said securement connector; and a locking member located at said flexible connecting member second end portion arranged to engage a portion of a stent; wherein a diameter of the securement connector remains constant during stent expansion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device for preventing stent movement during delivery comprising:
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a securement connector arranged to engage an outer surface of a catheter; a plurality of flexible comprising members, each of said flexible connecting members made from a shape memory material, each of said flexible connecting members having a first end portion and a second end portion, the first end portion coupled to said securement connector, wherein the flexible connecting members comprise a serpentine band; and a locking member located on each of said flexible connecing members second end portion arranged to engage a portion of a stent in a way that allows freedom of movement in a radial direction between the locking member and the stent; wherein a diameter of the securement connector remains constant during stent expansion. - View Dependent Claims (11, 12)
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13. A stent delivery system comprising:
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a catheter comprising an expandable balloon and a proximal shaft portion, the proximal shaft portion located proximal to said expandable balloon along the length of the catheter; a radically expandable stent having at least one engagable portion; at least one radically expandable constrainment member having a first end coupled to said catheter proximal shaft portion and a second end having at least one engaging portion; wherein the at least one constrainment member is in the form of a serpentine shaped wherein said constrainment;
member engaging portion and said stent engagable portion band and;wherein said constrainment;
member engaging portion and said stent engagable portion are engaged;and wherein said constrainment member ingaging portion and said stent engagable portion may remain engaged throughout the expansion of said balloon. - View Dependent Claims (14, 15)
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16. A stent delivery system comprising:
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a catheter; an expandable balloon; a radially expandable stent having at least one engagable portion; at least one radically expandable constrainment member having a first end coupled to said catheter and a second end having at least one engaging portion; wherein said constrainment member engaging portion and said stout engagable portion are engaged and are constructed and arranged to remain engaged until said balloon is at least partially deflated; and wherein the constrainment member is in the form of a serpentine shaped band; and wherein the constrainment is made from a shape memory material and is programmed to return to a reduced diameter configuration following balloon expansion.
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17. A stent delivery system comprising:
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a catheter comprising an expandable balloon and a proximal shaft portion, the proximal shaft portion located proximal to said expandable balloon along the length of the catheter; a radially expandable stent having at least one expandable portion; at least one radially expandable constrainment member having a first end coupled to said catheter proximal shaft portion and a second end having at least one engaging portion; wherein said constrainment member ingaging portion and said stent engagable portion are engaged; and wherein said constrainment member engaging portion and said stent engagable portion are in the form of a ball and socket; and wherein said constrainment member engaging portion and said stent engagable portion may remain engaged throughout the expansion of said balloon.
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18. A stent delivery system comprising:
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a catheter comprising an expandable balloon and a proximal shaft portion, the proximal shaft portion located proximal to said expandable balloon along the length of the catheter; a radially expandable stent arranged about said expandable balloon in an unexpanded state, said stent having an end portion, said end portion having at least one engagable portion; at least one radially expandable constrainment member arranged to partially overlay said balloon, said constrainment member having a first end coupled to said catheter proximal shaft portion, the constrainment member further comprising a serpentine band having a plurlality of openings therethrough and an engaging portion; wherein said constrainment member engaging portion is arranged to engage said stent engagable portion; and wherein when said constrainment member engaging portion and said stent engagable portion are engaged, movement of said stent engagable portion in the axial direction is prevented. - View Dependent Claims (19, 20)
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21. A device for preventing stent movement during delivery comprising:
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a securement connector arranged to engage an outer surface of a catheter; at least one flexible connecting member made from a shape memory material, said flexible connecting member comprising a serpentine band, said flexible connecting member having a first end portion and a second end portion, the first end portion coupled to said securement connector; and a locking member located at said flexible connecting member second end portion arranged to engage a portion of a stent; wherein a diameter of the securement connector remains constant during stent expansion; and
wherein the shape memory material comprises a shape memory alloy having an Austenite phase and a Martensite phase.
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Specification