Dual synchro-resonant electrosurgical apparatus with bi-directional magnetic coupling

• US 20070173810A1
• Filed: 01/24/2006
• Published: 07/26/2007
• Est. Priority Date: 01/24/2006
• Status: Active Grant

• Current Assignee: Covidien AG (Medtronic Plc)
• Original Assignee: Covidien AG (Medtronic Plc)
• Inventors: Orszulak, James
• Granted Patent: US 7,513,896 B2
• Time in Patent Office: Days
• US Class Current: 606/37
• CPC Class Codes: A61B 18/12 by passing a current through the tissue to be heated, e.g. high-frequency current
• CPC Class Codes: A61B 18/1206 Generators therefor
• CPC Class Codes: A61B 2018/0066 without feedback, i.e. open loop control
• CPC Class Codes: A61B 2018/124 switching the output to different electrodes, e.g. sequentially

Abstract

An electrosurgical generator is disclosed, which includes an RF output stage connected to a DC power supply and first and second connections. The first connection includes a first switching component and a first parallel inductor-capacitor resonant circuit. The second connection includes a second switching components and a second parallel inductor-capacitor resonant circuit. The first and second switching components are configured to open and close at a predetermined frequency based on a phase-correlated dual drive signal emitted by a driver and are in a 180 degree out-of-phase relationship. The first parallel inductor-capacitor resonant circuit is further configured to produce a first half-sinusoidal waveform and the second parallel inductor-capacitor resonant circuit is configured to produce a second half-sin half-sinusoidal waveform. The RF output stage further includes a transformer having a primary winding and a secondary winding and a series inductor-capacitor resonant circuit, which are configured to generate a sinusoidal waveform.

Claims

1. An electrosurgical generator comprising:

a selection module configured to transmit control signals which adjusts the electrosurgical generator to produce sinusoidal waveforms suitable for the at least one electrosurgical mode;

an RF output stage which generates sinusoidal waveforms for at least one electrosurgical mode, the RF output stage connected to a DC power supply including first and second connections, the first connection including a first switching component and a first parallel inductor-capacitor resonant circuit and the second connection including a second switching components and a second parallel inductor-capacitor resonant circuit, the first and second switching components being configured to open and close at a predetermined frequency based on a phase-correlated dual drive signal emitted by a driver and are in a 180 degree out-of-phase relationship, the first parallel inductor-capacitor resonant circuit being configured to produce a first half-sinusoidal waveform and the second parallel inductor-capacitor resonant circuit being configured to produce a second half-sinusoidal waveform, the RF output stage including;

a transformer having a primary winding and a secondary winding and a series inductor-capacitor resonant circuit, the series inductor-capacitor resonant circuit and the transformer configured to generate a sinusoidal waveform;

a switching module which, in response to the control signals, adjusts the first and second half-sinusoidal waveforms thereby producing the sinusoidal waveforms suitable for the at least one electrosurgical mode.

2. An electrosurgical generator as in claim 1, wherein the first parallel inductor-capacitor resonant circuit is tuned to a first self-resonant frequency which is substantially equivalent to the predetermined frequency.

3. An electrosurgical generator as in claim 2, wherein the first parallel inductor-capacitor resonant circuit includes a first inductor having a first inductance value and a first capacitor having a first capacitance value, wherein the first inductance value and the first capacitance correspond to the first self-resonant frequency.

4. An electrosurgical generator as in claim 1, wherein the second parallel inductor-capacitor resonant circuit is tuned to a second self-resonant frequency which is substantially equivalent to the predetermined frequency.

5. An electrosurgical generator as in claim 4, wherein the second parallel inductor-capacitor resonant circuit includes a second inductor having a second inductance value and a second capacitor having a second capacitance value, wherein the second inductance value and the second capacitance correspond to the second self-resonant frequency.

6. An electrosurgical generator as in claim 1, wherein the first and second switching components are selected from the group consisting of transistors and relays.

7. An electrosurgical generator as in claim 1, wherein the first and second switching components are selected from the group consisting of metal-oxide semiconductor field-effect transistors and insulated gate bipolar transistors.

8. An electrosurgical generator as in claim 1, wherein the series inductor-capacitor resonant circuit is tuned to a third self-resonant frequency which is substantially equivalent to the predetermined frequency.

9. An electrosurgical generator as in claim 8, wherein the series inductor-capacitor resonant circuit includes a third inductor having a third inductance value and a third capacitor having a third capacitance value, wherein the third inductance value and the third capacitance correspond to the third self-resonant frequency.

10. An electrosurgical generator as in claim 1, wherein the switching module includes a fourth capacitor and a first switch in parallel with the first capacitor, a fifth capacitor and a second switch in parallel with the second capacitor, and a third switch in parallel with the series inductor-capacitor resonant circuit.

11. An electrosurgical generator as in claim 1, wherein the at least one electrosurgical mode is selected from the group consisting of cutting, blending, division with hemostasis, fulguration, ablation, vessel sealing and coagulation.

12. An electrosurgical generator as in claim 1, further including at least one output configured to interface with an electrosurgical instrument suitable for a specific electrosurgical procedure.

13. An electrosurgical generator as in claim 12, wherein the electrosurgical procedure is selected from the group consisting of bipolar, monopolar, vessel sealing and ablation.

14. An electrosurgical generator as in claim 1, wherein first and second half-sinusoidal waveforms generate in-sync ripple components at the primary winding thereby producing opposing magnetic fields which prevent transfer of parasitic RF harmonic ring energy to the secondary winding.