Radiofrequency electrosurgical generator with current control

Details Radiofrequency electrosurgical generator with current control Radiofrequency electrosurgical generator with current control

A - Human Necessities

61

B

A61B 18/12 (2006.01)

Patent

CA 2335426

The invention realises a radio knife powered by an electronic circuit that operates with high-frequency current wherein said circuit comprises: a rectifier circuit (20) fed by the mains voltage that supplies rectified pulsating voltage (201) to a radiofrequency circuit (30); a radiofrequency circuit (30) capable of emitting an output current signal (301) with a constant frequency in the scale of the MHz, powering the radio knife by means of a radiofrequency transformer (40). Said radiofrequency circuit (30) is obtained by piloting a MOS (305) through a pilot circuit (306) comprising a quartz-operated oscillator whose oscillation frequency amounts to a least twice the usual operating frequency of the MOS. The pilot circuit (306) is controlled by microprocessor current control circuit (310) that takes a signal proportional to the current from a current sensor (308) positioned after the MOS (305) and is such as to maintain the radiofrequency circuit current limited to a value compatible with the power that can be dissipated by the MOS independently of any variation in the circuit load impedance.

L'invention concerne un appareil de radiochirurgie alimenté par un circuit électronique fonctionnant avec un courant haute fréquence, ce circuit comprenant : un circuit de redressement (20) alimenté par la tension aux bornes qui fournit une tension pulsatoire de redressement (201) à un circuit haute fréquence (30) ; un circuit haute fréquence (30) capable d'émettre un signal (301) de courant de sortie avec une fréquence constante dans l'échelle des MHz, ce signal alimentant l'appareil de radiochirurgie au moyen d'un transformateur (40) haute fréquence. On obtient ce circuit haute fréquence (30) en pilotant un MOS (métal-oxyde-semiconducteur) (305) dans un circuit de pilotage (306) comprenant un oscillateur à quartz dont la fréquence d'oscillation représente au moins deux fois la fréquence de fonctionnement habituelle du MOS. Le circuit de pilotage (306) est commandé par un circuit de commande (310) de courant microprocesseur disposé derrière le MOS (305) et il est tel qu'il peut maintenir le courant du circuit haute fréquence à une valeur compatible avec l'énergie pouvant être dissipée par le MOS indépendamment de toute variation de l'impédance de charge du circuit.

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