Electrosurgical ablation apparatus and a method of ablating...

A - Human Necessities – 61 – B

Patent

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A61B 18/18 (2006.01)

Patent

CA 2705806

A portable electrosurgical system (100) for treating biological tissue with microwave radiation (e.g. having a fre-quency between 500 MHz and 60GHz) is disclosed. The system comprises a hand-held microwave sub-assembly (102) which generates and amplifies a microwave signal (which may be continuous or modulated) for treatment and includes a treatment antenna (116) for delivering the radiation. Diode detectors (120, 122) in the sub- assembly (102) may detect forward and reflected power levels to enable determination of net delivered power. A dynamic impedance matching system may be provided to match energy developed by amplifiers (110, 112) in the sub-assembly (102) to the biological tissue load. A tuning filter (144) and couplers (146, 148, 150, 152) for extracting magnitude and phase information from the microwave signal are thus provided in the sub-assembly.

L'invention porte sur un système électrochirurgical portable (100) pour traiter des tissus biologiques par exposition à des micro-ondes (par exemple, d'une fréquence comprise entre 500 MHz et 60GHz). Le système comprend un sous-ensemble à main de production de micro-ondes (102) qui produit et amplifie un signal de micro-ondes (continu ou modulé) pour le traitement, et comporte une antenne de traitement (116) pour émettre le rayonnement. Des détecteurs à diodes (120, 122) présents dans le sous-ensemble (102) peuvent détecter des niveaux de puissance d'ondes directes et réfléchies pour déterminer la puissance nette fournie. On peut prévoir un système d'adaptation d'impédances dynamique pour adapter l'énergie développée par les amplificateurs (110, 112) du sous-ensemble (102) à la charge du tissu biologique. Un filtre d'accord (144) et des coupleurs (146, 148, 150, 152) pour extraire des informations d'amplitude et de phase du signal micro-onde sont également prévus dans le sous-ensemble.

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