Current leakage control for electrosurgical generator

A - Human Necessities – 61 – B

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A61B 18/12 (2006.01)

Patent

CA 2096335

A current leakage control circuit (115) regulates the output power of an electrosurgical generator (20) to limit the amount of leakage current. The leakage current is monitored with a differential transformer (90) which has the output lead (30) and return leads (80) of the electrosurgical generator (20) as first and second winding (96). A third or sense winding (100) produces a control signal whenever the currents in the output and return leads (30, 80) are not equal, thus indicating current leakage. The control signal is compared to a predetermined maximum safe level of leakage current. If this predetermined level is exceeded, a power control feedback loop of the eletrosurgical generator reduces the output power to a sufficiently lower level to reduce the leakage current within a maximum acceptable limit.

Circuit limiteur de courant de fuite (115) qui règle la puissance de sortie d'un générateur d'électrochirurgie (20) de façon à limiter le courant de fuite. Le courant de fuite est contrôlé au moyen d'un transformateur différentiel (90) qui a pour enroulements primaire et secondaire (96) le fil de sortie (30) et le fil de retour (80), respectivement, du générateur d'électrochirurgie (20). Un enroulement tertiaire (100), ou enroulement de détection, produit un signal de commande lorsque les courants dans les fils de sortie et de retour (30, 80) ne sont pas identiques, ce qui indique un courant de fuite. Le signal de commande est comparé avec un niveau maximal admissible de courant de fuite. Si ce niveau est dépassé, une boucle de réaction de commande de puissance du générateur d'électrochirurgie réduit la puissance de sortie suffisamment pour que le courant de fuite respecte la limite maximale.

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