Detachable endovascular occlusion device activated by alternatin

Details Detachable endovascular occlusion device activated by alternatin Detachable endovascular occlusion device activated by alternatin

1996-06-18

1999-11-02

Cohen, Lee

Surgery

Instruments

Electrical application

606 32, 606 40, A61B 1739

Patent

active

059761318

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.

REFERENCES:
patent: 5122136 (1992-06-01), Guglielmi et al.
patent: 5354295 (1994-10-01), Guglielmi et al.
patent: 5743905 (1998-04-01), Eder et al.

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