Detachable endovascular occlusion device activated by alternating electric current
First Claim
1. An apparatus for selectively providing endovascular occlusion in a patient comprising:
- a delivery wire guidable to or near an endovascular occlusion site;
a detachable conductive coil temporarily and selectively coupled to said delivery wire; and
an alternating current generator selectively coupled to said detachable coil for delivering damped RF power signals to said occlusion site,whereby a controllable occlusive apparatus efficacious and usable in small vessels is provided.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus is provided for electrocoagulating blood and tissue at an occlusion site by means of application of an alternating signal or current through a detachable partially insulated coil on the end of a microcatheter. A Guglielmi Detachable Coil (GDC) is preferably used in the combination with damped radio frequency energy to cause local heating at the location of the coil but without local ohmicly heated tissue damage or hot spots. Damping of the radio frequency energy facilitates the avoidance of hot spots. Once carbonization of blood at the detachment zone of the GDC coil occurs, the impedance of the entire system increases. The impedance increase is detected to automatically turn off the alternating current and then to apply a direct current to electrolytically detach the GDC coil from the microcatheter.
203 Citations
26 Claims
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1. An apparatus for selectively providing endovascular occlusion in a patient comprising:
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a delivery wire guidable to or near an endovascular occlusion site; a detachable conductive coil temporarily and selectively coupled to said delivery wire; and an alternating current generator selectively coupled to said detachable coil for delivering damped RF power signals to said occlusion site, whereby a controllable occlusive apparatus efficacious and usable in small vessels is provided. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An apparatus for selectively providing endovascular occlusion in a patient comprising:
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a delivery wire guidable to or near an endovascular occlusion site; a detachable conductive coil temporarily and selectively coupled to said delivery wire, said coil being at least partially insulated to at least reduce local ohmic heating at points of contact between said coil and surrounding tissue at said occlusion site; and an alternating current generator selectively coupled to said detachable coil for delivering RF power signals to said occlusion site, wherein said alternating current generator is a radio frequency generator which generates damped radio frequency power signals, whereby a controllable occlusive apparatus efficacious and usable in small vessels is provided. - View Dependent Claims (21)
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22. An apparatus for selectively providing endovascular occlusion in a patient comprising:
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a delivery wire guidable to or near an endovascular occlusion site; a detachable conductive coil temporarily and selectively coupled to said delivery wire, said coil being at least partially insulated to at least reduce local ohmic heating at points of contact between said coil and surrounding tissue at said occlusion site; and an alternating current generator selectively coupled to said detachable coil for delivering RF power signals to said occlusion site, a direct current signal source electrically coupled to said detachable coil and wherein said control circuit turns said alternating current generator off when said predetermined degree of electrocoagulation has occurred and turns said direct current signal source on to detach said coil from said delivery wire, whereby a controllable occlusive apparatus efficacious and usable in small vessels is provided.
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23. A method of forming a vascular occlusion comprising:
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providing a conductive delivery wire; disposing a conductive coil coupled to said delivery wire at or near a selected occlusion site; applying an alternating current to said coil to coagulate said occlusion site without substantial local ohmic heating between contact points between said coil and said occlusion site; determining whether a predetermined amount of electrocoagulation has occurred at said occlusion site; terminating said alternating current through said coil when said predetermined amount of electrocoagulation has occurred; and detaching said coil from said delivery wire to leave said coil at said occlusion site, whereby an occlusion is efficaciously provided in a small vessel. - View Dependent Claims (24)
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25. A method of forming a vascular occlusion comprising:
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providing a conductive delivery wire; disposing a conductive coil coupled to said delivery wire at or near a selected occlusion site; applying a damped alternating current to said coil to coagulate said occlusion site; determining whether a predetermined amount of electrocoagulation has occurred at said occlusion site; terminating said alternating current through said coil when said step of determining establishes that said predetermined electrocoagulation has occurred; and detaching said coil from said delivery wire to leave said coil at said occlusion site, whereby an occlusion is efficaciously provided in a small vessel. - View Dependent Claims (26)
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Specification