Assembly containing an electrolytically severable joint for endovascular embolic devices
First Claim
1. A wire assembly for use in formation of an occlusion in a body cavity in the presence of ionic body fluids comprising:
- a conductive implant detachably connected to a pusher wire, said pusher wire being insulated from said conductive implant, andan electrolytically severable joint disposed between said implant and said pusher wire, said joint adapted for releasing said conductive implant from said pusher wire upon imposition of a current in said pusher wire, wherein said conductive implant forms a return path for current provided to said assembly through ionic body fluids.
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Accused Products
Abstract
This invention is an apparatus for the formation of occlusions in spaces in the human body, occluding such as thrombi in arteries, veins, aneurysms, vascular malformations and arteriovenous fistulas. In particular, it deals with a one piece assembly having an improved electrolytically erodable link to an occlusive member and further having an incorporated return electrode in the assembly. The occlusion-forming member is introduced to and is intended to remain at the desired occlusion site. The invention also relates to the joint itself. The invention further includes a method for introduction and electrolytic separation of the device.
151 Citations
45 Claims
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1. A wire assembly for use in formation of an occlusion in a body cavity in the presence of ionic body fluids comprising:
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a conductive implant detachably connected to a pusher wire, said pusher wire being insulated from said conductive implant, and an electrolytically severable joint disposed between said implant and said pusher wire, said joint adapted for releasing said conductive implant from said pusher wire upon imposition of a current in said pusher wire, wherein said conductive implant forms a return path for current provided to said assembly through ionic body fluids. - View Dependent Claims (2, 3, 4)
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5. A wire assembly for use in formation of an occlusion in a body cavity comprising:
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a composite core wire having a conductive member and a further conductive member in electrical contact with said conductive member, an implant in electrical contact with said further conductive member, and an electrolytically severable joint mechanically joining said composite core wire to said implant, electrically insulated from said conductive member and said further conductive member, said joint causing release of said implant and causing separation of said said conductive member from said further conductive member upon imposition of current to said joint, wherein said implant forms a return path for current provided to said conductive member through ionic body fluids. - View Dependent Claims (6, 7, 8)
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9. A wire assembly for use in formulation of an occlusion in a body cavity and suitable for delivery to said body cavity using a catheter comprising:
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a composite core wire, said composite core wire having a longitudinal axis, a proximal end, a distal end, a first electrically conductive member and a second electrically conductive member, said first and second electrically conductive members being electrically insulated from each other and adapted to be electrically insulated from surrounding body fluids, an implant, said implant having a longitudinal axis, a proximal end, a distal end and a third electrically conductive member, said third electrically conductive member being electrically insulated from said second electrically conductive member and having a proximal end and a distal end, said third electrically conductive member being configured to carry electrical current between the distal end of said first electrically conductive member and an exposed area of said implant, said exposed area adapted to have direct electrical contact with both the distal end of said third electrically conductive member and surrounding body fluids, and an electrolytically erodable junction, said electrolytically erodable junction being configured to releasably attach the proximal end of said implant to the distal end of said composite core wire and to urge said first electrically conductive member into electrical contact with said third electrically conductive member when in an intact state, said electrolytically erodable junction configured to allow complete physical detachment between said implant and said core wire upon electrolytic erosion of said electrolytically erodable junction to result in a detached state, the transition between said intact state and said detached state being caused by application of a potential difference between said first electrically conductive member and said second electrically conductive member, said potential difference being large enough to cause electrolytic erosion of said electrolytically erodable junction when said junction is disposed in a body fluid. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A wire assembly for use in formation of an occlusion in a body cavity and suitable for delivery to said body cavity using a catheter comprising:
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a composite core wire, said composite core wire having a longitudinal axis, a proximal end, and a distal end, a first electrically conductive member, a second electrically conductive member, and a first electrically insulating member, said first electrically insulating member configured to directly contact both said first electrically conductive member and said second electrically conductive member, to electrically insulate them from each other, and to electrically insulate said first electrically conductive member from surrounding body fluids, and an implant having a proximal end and a distal end, and an electrolytically erodable junction, said electrolytically erodable junction being configured to releasably attach the proximal end of said implant to the distal end of said composite core wire when in an intact state, and being configured to allow complete physical detachment between said implant and said core wire upon electrolytic erosion of said electrolytically erodable junction to result in a detached state, the transition between said intact state and said detached state being caused by application of a potential difference between said first electrically conductive member and said second electrically conductive member, said potential difference being large enough to cause electrolytic erosion of said electrolytically erodable junction in a body fluid. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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Specification