Self-limiting electrosurgical return electrode

A - Human Necessities – 61 – B

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A61B 18/16 (2006.01) A61N 1/04 (2006.01)

Patent

CA 2470764

A removable semi-insulating sheet (34) for use in self-limiting electrosurgical return electrode for electrosurgery. Through the selection of impedance characteristics for the electrode materials of the principal body of the semi-insulating sheet, and through tailoring of semi-insulating sheet geometries, the return electrode of the present invention is self-regulating and self-limiting as to current density and temperature rise so as to prevent patient trauma. The semi-insulating sheet has an effective bulk impedance equal to or greater than about 4,000 ohm-cm. The effective bulk impedance of the sheet may rise from resistive components, capacitive components, inductive components, or combinations thereof. The configuration of the presently described return electrode allows the electrode to self-limit the electrode's current densities, thereby preventing burning of a patient during surgery.

L'invention a trait à une feuille semi-isolante amovible, utilisée comme feuille semi-isolante de référence électrochirurgicale autolimitative, et destinée à des interventions électrochirurgicales. Grâce à la sélection des caractéristiques d'impédance pour les matériaux d'électrode du corps principal de la feuille semi-isolante, et à l'adaptation de la géométrie de la feuille semi-isolante, l'électrode de référence de la présente invention est autorégulatrice et autolimitative en ce qui concerne la densité de courant et la hausse de température, afin d'éviter tout traumatisme du patient. La feuille semi-isolante présente une impédance interne effective égale ou supérieure à environ 4'000 .OMEGA..cm. L'impédance interne effective de la feuille peut être produite par des composants résistifs, des composants inductifs, ou des combinaisons de ces derniers. Grâce à sa configuration, l'électrode de référence selon l'invention est capable d'autolimiter ses densités de courant, ce qui permet d'éviter toute brûlure du patient lors d'une intervention chirurgicale.

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