Apparatus for delivering, repositioning and/or retrieving self-expanding stents
First Claim
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1. Apparatus for deploying and/or retrieving and/or repositioning a stent having a shape memory, comprising:
- an elongate catheter assembly having a proximal end region and a distal end region;
a thermal transfer device situated on said catheter assembly defining a chamber having a thermal transfer wall; and
means for providing an inflow of thermal transfer fluid into said chamber from said proximal end region of said catheter assembly for transferring thermal energy to said stent through said thermal transfer wall, to adjust the temperature of the stent.
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Abstract
Apparatus for delivering and deploying a stent formed of a shape memory alloy to a desired position in a tubular area of the body, and/or for repositioning and/or retrieving a stent formed of a two-way shape memory alloy. An arrangement is provided by which the temperature of the stent is locally adjusted during delivery, repositioning and/or retrieval in a safe and controlled manner by engagement with an expandable and collapsible thermal transfer member situated on a catheter assembly.
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Citations
86 Claims
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1. Apparatus for deploying and/or retrieving and/or repositioning a stent having a shape memory, comprising:
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an elongate catheter assembly having a proximal end region and a distal end region;
a thermal transfer device situated on said catheter assembly defining a chamber having a thermal transfer wall; and
means for providing an inflow of thermal transfer fluid into said chamber from said proximal end region of said catheter assembly for transferring thermal energy to said stent through said thermal transfer wall, to adjust the temperature of the stent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. Apparatus for deploying, retrieving and/or repositioning a stent having a shape memory, comprising:
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an elongate catheter assembly having proximal and distal end regions;
a thermal transfer device including a balloon member operatively connected to said catheter assembly defining a chamber having a thermal transfer wall, at least a part of which constitutes a thermal transfer material; and
circulation means for providing an inflow of thermal transfer fluid into the interior of said chamber for transferring thermal energy to a stent through said outer thermal transfer wall to adjust the temperature of the stent, and for providing an outflow of thermal transfer fluid from the interior of said chamber to said proximal end region of said catheter assembly. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 82, 83)
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41. Apparatus for deploying, retrieving and/or repositioning a stent having a shape memory, comprising:
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an elongate catheter assembly having proximal and distal end regions;
a thermal transfer device comprising an expandable member situated on said catheter assembly defining a chamber having a thermal transfer wall, at least a portion of which constitutes a heat transfer material, said expandable member being expandable and collapsible between expanded and collapsed conditions;
circulation means for providing an inflow of thermal transfer fluid from the proximal end region of said catheter assembly into the interior of said chamber and for providing an outflow of thermal transfer fluid from the interior of said chamber to the proximal end region of said catheter assembly; and
a stent-capturing device situated on said catheter assembly for releasably holding a stent situated at said expandable member during deployment, and releasably grasping said stent during its retrieving and/or repositioning. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49, 50, 84)
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51. Apparatus for deploying, repositioning and/or retrieving a stent, comprising:
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an elongate catheter assembly having a proximal end region and a distal end region;
a thermal transfer device comprising a collapsible sleeve-type balloon member comprising a chamber which in its expanded condition has an annular cross-section, said balloon being situated at said distal end of said catheter assembly, said balloon member having an outer wall formed at least in part of heat transfer material;
mechanical means for selectively expanding and collapsing said balloon member operable from said proximal end region of said catheter assembly;
thermal transfer fluid circulating means for circulating a thermal transfer fluid from the proximal end of said catheter assembly into said chamber of said balloon member and back to said proximal end region of said catheter assembly; and
stent-capturing means situated at said distal end region of said catheter assembly for releasably holding said stent during deployment, and grasping said stent during retrieval and/or repositioning. - View Dependent Claims (52, 53)
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54. Apparatus for deploying, repositioning and/or retrieving a stent, comprising:
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a catheter assembly having a proximal end region and a distal end region;
a thermal transfer device comprising an expandable member comprising a chamber which in its expanded condition has a circular disk shape transverse cross-section, said expandable member having an outer wall formed at least in part of heat transfer material;
mechanical means for selectively expanding and collapsing said expandable member operable from said proximal end region of said catheter assembly;
thermal fluid circulating means for circulating a thermal transfer fluid from the proximal end region of said catheter assembly into said chamber of said expandable member and back to said proximal end region of said catheter assembly; and
stent-capturing means situated at said distal end region of said catheter assembly for releasably capturing said stent during deployment, retrieval and/or repositioning. - View Dependent Claims (55, 56)
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57. Apparatus for deploying, retrieving and/or repositioning a stent, comprising:
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a catheter assembly having proximal and distal end regions;
a thermal transfer device comprising a collapsible balloon member comprising a chamber which in its expanded condition includes at least one pair of-radially and axially extending opposed wall members extending longitudinally between said outer wall of said balloon member and said catheter assembly, said pair of opposed wall members at least in part forming said chamber and defining a radial space external of said chamber therebetween;
mechanical means for selectively expanding and collapsing said balloon member operable from said proximal end region of said catheter assembly;
thermal transfer fluid circulating means for circulating a thermal fluid from said proximal end of said catheter assembly into said chamber of said balloon member and back to said proximal end region of said catheter assembly; and
stent-capturing means situated at said catheter assembly for releasably capturing said stent during deployment, retrieval and/or repositioning. - View Dependent Claims (58, 59, 60, 61, 85)
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62. Apparatus for deploying, retrieving and/or repositioning a stent, comprising:
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an elongate catheter assembly having proximal and distal end regions;
a thermal transfer device operatively connected to said catheter assembly, said thermal transfer device comprising a collapsible balloon comprising a chamber which in its expanded condition comprises an outer chamber portion having an outer wall formed at least in part of heat transfer material, and an inner chamber portion in fluid communication with said outer chamber portion;
mechanical means for selectively expanding and collapsing said balloon operable from said proximal end region of said catheter assembly;
thermal fluid circulating means for circulating a thermal fluid from the proximal end of said catheter assembly into said outer chamber portion of said balloon and back to said proximal end region of said catheter assembly from said inner chamber portion of said balloon; and
stent-capturing means situated at said distal end region of said catheter assembly for releasably capturing said stent during deployment, retrieval and/or repositioning. - View Dependent Claims (63, 64, 65)
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66. Apparatus for deploying and/or retrieving and/or repositioning a stent having a shape memory, comprising
an elongate catheter assembly having a proximal end region and a distal end region; - and
a thermal transfer device operatively associated with said catheter assembly, said thermal transfer device comprising means for effecting local heat transfer with a stent being deployed, retrieved and/or repositioned by said apparatus to control the temperature of the stent. - View Dependent Claims (67, 70, 81, 86)
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- 68. Apparatus as recited in clam 66 wherein said thermal transfer device includes a thermal transfer surface, and means for positioning said thermal transfer surface in local thermal transfer relationship with a stent during its deployment, retrieval and/or repositioning.
Specification