The present invention relates to a pulse generating circuit for an electrosurgical generator, for generating a waveform suitable for causing electroporation of biological tissue. The pulse generating circuit comprises a voltage source connectable to a load via a switching element, and an open circuit coaxial transmission line connected between the switching element and the voltage source to be charged by the voltage source when the switching element is in an OFF state and to be discharged when the switching element is in an ON state. The switching element comprises a plurality of series connected avalanche transistors, and a trigger pulse generator configured to generate a trigger pulse to activate the plurality of series connected avalanche transistors. Furthermore, the impedance of the coaxial transmission line is configured to match a sum of (i) the impedance the plurality of series connected avalanche transistors, and (ii) the impedance of the load.

The present invention relates to a pulse generating circuit for an electrosurgical generator, for generating a waveform suitable for causing electroporation of biological tissue. The pulse generating circuit comprises a voltage source connectable to a load via a switching element, and an open circuit coaxial transmission line connected between the switching element and the voltage source to be charged by the voltage source when the switching element is in an OFF state and to be discharged when the switching element is in an ON state. The switching element comprises a plurality of series connected avalanche transistors, and a trigger pulse generator configured to generate a trigger pulse to activate the plurality of series connected avalanche transistors. Furthermore, the impedance of the coaxial transmission line is configured to match a sum of (i) the impedance the plurality of series connected avalanche transistors, and (ii) the impedance of the load.

A bipolar pulse generating circuit for an electrosurgical generator generates a waveform for electroporation of biological tissue comprising a voltage source connectable to a load via a switching element, and a coaxial transmission line having an inner conductor separated from an outer conductor. The inner conductor first end is connected between the switching element and the voltage source and second end is in an open circuit condition, whereby the line is charged when the switching element is OFF and discharged when the element is ON. The bipolar pulse generating circuit has an output connectable to the load, wherein the first output supports a positive pulse when the line discharges, and a second output supports a negative pulse when the line discharges. The impedance of the coaxial transmission line matches a sum of impedance of the switching element, the load at the first output, and the load at the second output.

A bipolar pulse generating circuit for an electrosurgical generator generates a waveform for electroporation of biological tissue comprising a voltage source connectable to a load via a switching element, and a coaxial transmission line having an inner conductor separated from an outer conductor. The inner conductor first end is connected between the switching element and the voltage source and second end is in an open circuit condition, whereby the line is charged when the switching element is OFF and discharged when the element is ON. The bipolar pulse generating circuit has an output connectable to the load, wherein the first output supports a positive pulse when the line discharges, and a second output supports a negative pulse when the line discharges. The impedance of the coaxial transmission line matches a sum of impedance of the switching element, the load at the first output, and the load at the second output.

An apparatus is described. The apparatus includes a stacked switch circuit having protection circuitry to prevent shoot through current when the switch is in an off state and respective voltages at the terminals of the switch change such that before the change one of the terminals of the switch has the higher voltage and after the change the other terminal of the switch has the higher voltage.