Endovascular electrolytically detachable wire and tip for the formation of thrombus in arteries, veins, aneurysms, vascular malformations and arteriovenous fistulas
First Claim
1. A guidewire for use in endovascular electrothrombosis in combination with a microcatheter, the guidewire comprising:
- a core wire having a main body and a distal portion; and
a detachable coil for endovascular insertion within a body cavity, said detachable coil being coupled to said main body via said distal portion of said core wire and comprised of material less susceptible to electrolytic disintegration than said core wire, said distal portion being more susceptible to electrolytic disintegration than said detachable coil so that on the application of electric current to the guidewire when said detachable coil is disposed in the cavity, electrothrombosis is performed in the body cavity by said detachable coil and at least one portion of said distal portion is electrolytically disintegrated to detach said detachable coil from said main body to enable the removal of the main body of the core wire whilst leaving the detached coil within the body cavity.
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Accused Products
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.
125 Citations
13 Claims
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1. A guidewire for use in endovascular electrothrombosis in combination with a microcatheter, the guidewire comprising:
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a core wire having a main body and a distal portion; and a detachable coil for endovascular insertion within a body cavity, said detachable coil being coupled to said main body via said distal portion of said core wire and comprised of material less susceptible to electrolytic disintegration than said core wire, said distal portion being more susceptible to electrolytic disintegration than said detachable coil so that on the application of electric current to the guidewire when said detachable coil is disposed in the cavity, electrothrombosis is performed in the body cavity by said detachable coil and at least one portion of said distal portion is electrolytically disintegrated to detach said detachable coil from said main body to enable the removal of the main body of the core wire whilst leaving the detached coil within the body cavity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A guidewire for use in electrothrombosis in combination with a microcatheter, the guidewire comprising:
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a core wire having a main body and a distal portion ; and a detachable coil coupled to said main body via said distal portion and comprised of material less susceptible to electrolytic disintegration than said core wire, said detachable coil containing no internal reinforcement and being for insertion within a body cavity; wherein said distal portion is more susceptible to electrolytic disintegration than said detachable coil, so that on the application of current to the guidewire when said detachable coil is disposed in the body cavity, electrothrombosis is performed and at least one portion of said distal portion is electrolytically disintegrated to detach said detachable coil from said main body.
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13. A guidewire for use in electrothrombosis in combination with a microcatheter having a distal end, the guidewire comprising:
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a core wire having a main body and a distal portion, said distal portion being susceptible to electrolytic disintegration in blood; and a detachable coil for insertion within a body cavity, said detachable coil being coupled to said main body via said distal portion, being comprised of material not susceptible to electrolytic disintegration in blood, and being prebiased to a spiral or helical shape such that on its advancement out of the distal end of the microcatheter and into a body cavity it will change from being straight to its prebiased spiral or helical shape so that on the application of current to the guidewire when said detachable coil is disposed in the body cavity, electrothrombosis is performed and at least one portion of said distal portion electrolytically disintegrates to detach said detachable coil from said main body.
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Specification