An electrosurgical instrument

A - Human Necessities – 61 – B

Patent

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Details

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

Patent

CA 2286835

In an electrosurgical instrument susceptible to varying load impedance, particularly varying load reactance, a fixed frequency radio frequency generator has an output stage (Q1, Q2, TR2-TR4, C1, VC2, 42) consisting of at least one output power device and, coupled to the power device, an output network with a load-dependent resonant condition. To compensate for variations in the load reactance, the output network has a dynamically variable capacitor (VC2) which maintains the tuning of the network substantially constant. Variation of the capacitor (VC2) is performed by means of a phase comparator and servo device (44) which are responsive to variations in phase difference occurring in the output stage due to load reactance changes.

L'invention porte sur un instrument électrochirurgical apte à faire varier l'impédance de charge, notamment la réactance de charge, et comprenant un générateur radiofréquence à fréquence fixe qui comporte un étage de sortie (Q1, Q2, TR2-TR4, C1, VC2, 42) constitué d'au moins un dispositif de puissance de sortie et, couplé à ce dispositif de puissance, un réseau de sortie avec un état de résonance tributaire de la charge. De façon à compenser les variations de la réactance de charge, le réseau de sortie possède un condensateur à dynamique variable (VC2) qui maintient l'accord du réseau sensiblement constant. La variation du condensateur (VC2) s'effectue au moyen d'un comparateur de phase et d'un servomoteur (44) qui réagissent aux variations de différence de phase se produisant dans l'étage de sortie et dues aux modifications de la réactance de charge.

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