Endovascular electrolytically detachable wire and tip for the formation of thrombus in arteries, veins, aneurysms, vascular malformations and arteriovenous fistulas
DCFirst Claim
1. An apparatus for forming an occlusion within a body cavity having an ionic fluid therein comprising:
- a wire adapted to be disposed near an opening into said body cavity;
a separable distal tip of said wire adapted for disposition into said body cavity to form said occlusion within said body cavity about said distal tip; and
an electrolytically detachable connecting segment coupling said distal tip and said wire.
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Abstract
An artery, vein, aneurysm, vascular malformation or arterial fistula is occluded through endovascular occlusion by the endovascular insertion of a platinum wire and/or tip into the vascular cavity. The vascular cavity is packed with the tip to obstruct blood flow or access of blood in the cavity such that the blood clots in the cavity and an occlusion if formed. The tip may be elongate and flexible so that it packs the cavity by being folded upon itself a multiple number of times, or may pack the cavity by virtue of a filamentary or fuzzy structure of the tip. The tip is then separated from the wire mechanically or by electrolytic separation of the tip from the wire. The wire and the microcatheter are thereafter removed leaving the tip embedded in the thrombus formed within the vascular cavity. Movement of wire in the microcatheter is more easily tracked by providing a radioopaque proximal marker on the microcatheter and a corresponding indicator marker on the wire. Electrothrombosis is facilitate by placing the ground electrode on the distal end of the microcatheter and flowing current between the microcatheter electrode and the tip.
237 Citations
24 Claims
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1. An apparatus for forming an occlusion within a body cavity having an ionic fluid therein comprising:
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a wire adapted to be disposed near an opening into said body cavity; a separable distal tip of said wire adapted for disposition into said body cavity to form said occlusion within said body cavity about said distal tip; and an electrolytically detachable connecting segment coupling said distal tip and said wire. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for use in formation of an occlusion used in combination with a catheter comprising:
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an electrolyzable core wire having a distal portion; and a separable elongate tip portion extending said core wire and coupled to said distal portion of said core wire, said separable elongate tip portion for insertion within a body cavity, said separable elongate tip portion not resistant to electrolytic disintegration in fluid as compared to said electrolyzable core wire, and said separable elongate tip portion being detachable from said core wire by electrolysis, wherein said separable elongate tip portion is a long and substantially flexible segment and is comprised of a metal not as susceptible to electrolytic disintegration within fluid as said core wire, and wherein said long and flexible segment is prebiased to form a helix when extended from said catheter. - View Dependent Claims (9, 10)
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11. A method for forming an occlusion within a body cavity having an ionic fluid therein comprising the steps of:
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disposing a separable distal tip of a wire into said body cavity to form said occlusion within said body cavity about said distal tip; and electrolytically detaching said distal tip from said wire to leave said distal tip within said body cavity with said occlusion being formed within said body cavity. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method of using a catheter to form an occlusion comprising:
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disposing an electrolyzable core wire near the situs of said occlusion; disposing a separable elongate tip portion extending from said catheter and coupled to said core wire at said situs of said occlusion, said separable elongate tip portion being more resistant to electrolytic disintegration in fluid than said electrolyzable core wire, and being a long and substantially flexible segment prebiased to form a helix when extended from said catheter; and detaching said separable elongate tip portion from said core wire by electrolysis. - View Dependent Claims (18, 19)
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20. An apparatus for use in formation of an occlusion within a body cavity comprising:
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a core wire having at least a electrolyzable distal portion; and a separable elongate tip portion of said core wire coupled to and extending from said core wire, said separable elongate tip portion adapted to form said occlusion in said body cavity and being adapted for insertion within said body cavity, said separable elongate tip portion being resistant to electrolysis compared to said distal portion of said core wire, said separable elongate tip portion being coupled to said core wire by said electrolyzable distal portion. - View Dependent Claims (21, 22, 23, 24)
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Specification