A radio-frequency generator for an ablation device

Details A radio-frequency generator for an ablation device A radio-frequency generator for an ablation device

A - Human Necessities

61

B

A61B 18/14 (2006.01) A61B 18/12 (2006.01)

Patent

CA 2331321

An apparatus and method for use in performing ablation of organs and other tissues includes a radio frequency generator which provides a radio frequency signal to ablation electrodes. The power level of the radio frequency signal is determined based on the subject area of ablation. The radio frequency signal is coupled with the ablation electrodes through a transformation circuit. The transformation circuit includes a transformer having a double secondary windings that can be connected into or out of use depending upon the load condition, creating this way a high impedance transformation circuit and a low impedance transformation circuit. The high or low impedance transformation circuit is selected based on the impedance of the ablation electrodes in contact with the subject tissue. Vacuum level, impedance level, resistance level, and time are measured during ablation. If these parameters exceed determinable limits the ablation procedure is terminated.

L'invention concerne un dispositif et une méthode qui permettent d'effectuer l'ablation d'organes ou autres tissus. Le dispositif comprend un générateur de radiofréquences qui fournit un signal RF aux électrodes d'ablation. La puissance dudit signal est déterminée en fonction de la zone cible de l'ablation. Le signal RF est couplé aux électrodes par un transformateur comportant deux enroulements secondaires qui peuvent être connectés de façon à être mis en marche ou coupés en fonction de la condition de charge, créant ainsi un circuit de transformation, qui comprend un circuit de transformation à forte impédance et un circuit de transformation à faible impédance. L'un des deux circuits est sélectionné en fonction de l'impédance des électrodes en contact avec le tissu cible. La dépression, l'impédance, la résistance et la durée sont mesurées pendant l'ablation. Si ces paramètres dépassent des limites déterminables, l'intervention est interrompue.

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