| CPC A61B 18/1815 (2013.01) [H03F 3/19 (2013.01); A61B 2017/00181 (2013.01); A61B 2018/1823 (2013.01)] | 11 Claims |
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1. An electrosurgical generator comprises an amplifier line-up that comprises:
a microwave signal generator for generating microwave electromagnetic (EM) radiation;
a modulator arranged to pulse the microwave EM radiation; and
an amplifier module connected to the modulator and arranged to increase the power of the pulses of the microwave EM radiation received therefrom, the amplifier module comprising an array of amplifiers connected in parallel, wherein output signals from the array of amplifiers are combined to produce an output microwave signal; and
a feed structure for conveying the output microwave signal to a probe,
wherein the modulator is configured to cause the output microwave signal to comprise a series of microwave pulses having a duty cycle equal to or less than 20%, wherein each microwave pulse has a duration equal to or less than 0.1 s, and
wherein the amplifier module comprises:
a power divider unit arranged to receive the pulses of the microwave EM radiation from the modulator and split them into input signals for the array of amplifiers, wherein the power divider unit comprises a plurality of cascaded power dividers arranged in two or more ranks; and
a power combiner unit arranged to combine the output signals from the array of amplifiers,
wherein the power combiner unit comprises a plurality of cascaded power combiners arranged in two or more ranks which mirror the two or more ranks of the plurality of cascaded power dividers.
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