G - Physics – 05 – F
Patent
G - Physics
05
F
326/15, 323/4
G05F 1/63 (2006.01) A61B 18/12 (2006.01)
Patent
CA 2001637
ABSTRACT OF THE DISCLOSURE Conventional electrosurgery apparatus includes an r.f. power amplifier with an output to a patient electrode. The amplifier is controlled by the level of an input voltage to the amplifier. In the present invention, the input to the amplifier is provided by signals from a control unit which receives a sample of the voltage and current of the output signal. The voltage and current signals are supplied to A/D converters to provide two digital signals that are used to address a look-up table in an EPROM and provide a digital output representative of impedance. A switch is set by the user to the desired mode/power curve and this provides a digital signal which together with the impedance signal is used to address a second look-up table in an EPROM which contains digital representations of the required output voltage of the amplifier to produce the desired power level. An adder compares the required voltage with a feedback of the actual voltage to produce an error signal that is supplied to the amplifier to control its output.
Fetherstonhaugh & Co.
Smiths Industries Public Limited Company
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