Electrosurgical apparatus with real-time RF tissue energy control

• US 9,028,479 B2
• Filed: 08/01/2011
• Issued: 05/12/2015
• Est. Priority Date: 08/01/2011
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Orszulak, James H.
• Primary Examiner(s): Hupczey, Ronald
• Assistant Examiner(s): KIM, EUN HWA
• Application Number:
  US13/195,607
• Publication Number:
  US 20130035679A1
• Time in Patent Office: 1,380 Days
• Field of Search: 330/262, 330/10, 330/207.A, 330/251, 330/270, 330/259, 330/290, 606 32- 42
• US Class Current: 606/34
• CPC Class Codes: A61B 18/1206 Generators therefor
• CPC Class Codes: A61B 18/1233 with circuits for assuring patient safety
• CPC Class Codes: A61B 18/1402 Probes for open surgery
• CPC Class Codes: A61B 18/1445 at the distal end of a shaft, e.g. forceps or scissors at the end of a rigid rod
• CPC Class Codes: A61B 18/1815 using microwaves
• CPC Class Codes: A61B 2018/00607 Coagulation and cutting with the same instrument
• CPC Class Codes: A61B 2018/00702 Power or energy
• CPC Class Codes: A61B 2018/00726 Duty cycle
• CPC Class Codes: A61B 2018/00732 Frequency
• CPC Class Codes: A61B 2018/00761 Duration
• CPC Class Codes: A61B 2018/00767 Voltage
• CPC Class Codes: A61B 2018/00827 Current
• CPC Class Codes: A61B 2018/00845 Frequency
• CPC Class Codes: A61B 2018/00869 Phase
• CPC Class Codes: A61B 2018/128 generating two or more frequencies
• CPC Class Codes: H03F 1/30 Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in differential amplifiers H03F3/45479
• CPC Class Codes: H03F 2200/153 Feedback used to stabilise the amplifier
• CPC Class Codes: H03F 2203/45138 Two or more differential amplifiers in IC-block form are combined, e.g. measuring amplifiers
• CPC Class Codes: H03F 2203/45456 the CSC comprising bias stabilisation means, e.g. DC-level stability, positive or negative temperature coefficient dependent control
• CPC Class Codes: H03F 2203/45731 the LC comprising a transformer
• CPC Class Codes: H03F 3/24 : of transmitter output stages

Abstract

A radio-frequency (RF) amplifier having a direct response to an arbitrary signal source to output one or more electrosurgical waveforms within an energy activation request, is disclosed. The RF amplifier includes a phase compensator coupled to an RF arbitrary source, the phase compensator configured to generate a reference signal as a function of an arbitrary RF signal from the RF arbitrary source and a phase control signal; at least one error correction amplifier coupled to the phase compensator, the at least one error correction amplifier configured to output a control signal at least as a function of the reference signal; and at least one power component coupled to the at least one error correction amplifier and to a high voltage power source configured to supply high voltage direct current thereto, the at least one power component configured to operate in response to the control signal to generate at least one component of the at least one electrosurgical waveform.

Claims

1. A radio-frequency (RF) amplifier for outputting at least one electrosurgical waveform, comprising:

a phase compensator coupled to an RF arbitrary source, the phase compensator configured to generate a reference signal as a function of an arbitrary RF signal from the RF arbitrary source and a phase control signal;

at least one error correction amplifier coupled to the phase compensator, the at least one error correction amplifier configured to output a control signal at least as a function of the reference signal;

at least one power component coupled to the at least one error correction amplifier and to a high voltage power source configured to supply high voltage direct current thereto, the at least one power component configured to operate in response to the control signal to generate at least one component of the at least one electrosurgical waveform; and

at least one stabilization amplifier coupled to the at least one power component, the at least one stabilization amplifier configured to introduce an error correction current into the electrosurgical waveform based on DC bias current flowing from the at least one power component.

2. The RF amplifier according to claim 1, further comprising:

a gain selector configured to provide a gain control adjustment to the control signal based on a gain control signal.

3. The RF amplifier according to claim 2, further comprising:

at least one gain amplifier coupled to the at least one error correction amplifier and the gain selector, the at least one gain amplifier configured to adjust the control signal based on the gain control adjustment.

4. The RF amplifier according to claim 1, further comprising:

at least one current sensor coupled to the at least one power component, the at least one current sensor configured to provide a signal representative of the at least one electrosurgical waveform to the at least one error correction amplifier.

5. An RF amplifier configured to output at least one electrosurgical waveform in response to an arbitrary RF signal, the RF amplifier comprising:

a phase compensator coupled to an RF arbitrary source, the phase compensator configured to generate a reference signal as a function of an arbitrary RF signal from the RF arbitrary source and a phase control signal;

at least one error correction amplifier coupled to the phase compensator, the at least one error correction amplifier configured to output a control signal at least as a function of the reference signal;

at least one power component coupled to the at least one error correction amplifier and to a high voltage power source configured to supply high voltage direct current thereto, the at least one power component configured to operate in response to the control signal to generate at least one component of the at least one electrosurgical waveform; and

at least one stabilization amplifier coupled to the at least one power component, the at least one stabilization amplifier configured to introduce an error correction current into the electrosurgical waveform based on DC bias current flowing from the at least one power component.

6. The RF amplifier according to claim 5, further comprising:

at least one frequency compensation network coupled to the at least one current sensor.

7. An electrosurgical generator comprising:

a high voltage power source configured to supply high voltage direct current;

an radio-frequency (RF) arbitrary source configured to generate an arbitrary RF signal;

a radio-frequency (RF) amplifier configured to output at least one electrosurgical waveform, the RF amplifier including;

a phase compensator coupled to the RF arbitrary source, the phase compensator configured to generate a reference signal as a function of the arbitrary RF signal from the RF arbitrary source and a phase control signal;

at least one error correction amplifier coupled to the phase compensator, the at least one error correction amplifier configured to output a control signal at least as a function of the reference signal;

at least one power component coupled to the at least one error correction amplifier and to the high voltage power source, the at least one power component configured to operate in response to the control signal to generate at least one component of the at least one electrosurgical waveform; and

at least one stabilization amplifier coupled to the at least one power component, the at least one stabilization amplifier configured to introduce an error correction current into the electrosurgical waveform based on DC bias current flowing from the at least one power component; and

a controller configured to adjust at least one of the arbitrary RF signal and the phase control signal in response to at least one selected electrosurgical operational mode.

8. The electrosurgical generator according to claim 7, wherein the RF amplifier includes:

a gain selector configured to provide a gain control adjustment to the control signal based on a gain control signal provided by the controller.

9. The electrosurgical generator according to claim 8, wherein the RF amplifier includes:

at least one gain amplifier coupled to the at least one error correction amplifier and the gain selector, the at least one gain amplifier configured to adjust the control signal based on the gain control adjustment.

10. The electrosurgical generator according to claim 7, wherein the RF amplifier includes:

at least one current sensor coupled to the at least one power component, the at least one current sensor configured to provide a signal representative of the at least one electrosurgical waveform to the at least one error correction amplifier.

11. The electrosurgical generator according to claim 10, wherein the RF amplifier includes:

at least one frequency compensation network coupled to the at least one current sensor.

12. The electrosurgical generator according to claim 7, further comprising:

a patient isolation transformer coupled to the RF amplifier, the patient isolation transformer including a primary winding coupled to the at least one power component.

13. The electrosurgical generator according to claim 7, further comprising:

a patient isolation transformer coupled to the RF amplifier, the patient isolation transformer including a primary winding coupled to the first and second power components.

14. An electrosurgical generator comprising:

a high voltage power source configured to supply high voltage direct current;

an radio-frequency (RF) arbitrary source configured to generate an arbitrary RF signal;

at least one radio-frequency (RF) amplifier configured to output at least one electrosurgical waveform, the at least one RF amplifier including;

a phase compensator coupled to the RF arbitrary source, the phase compensator configured to generate a reference signal as a function of the arbitrary RF signal from the RF arbitrary source and a phase control signal;

a first control loop including;

a first error correction amplifier coupled to the phase compensator, the first error correction amplifier configured to output a first control signal at least as a function of the reference signal; and

a first power component coupled to the first error correction amplifier and to the high voltage power source, the first power component configured to operate in response to the first control signal to generate a first component of the at least one electrosurgical waveform;

a second control loop including;

a second error correction amplifier coupled to the phase compensator, the second error correction amplifier configured to output a second control signal at least as a function of the reference signal; and

a second power component coupled to the second error correction amplifier and to the high voltage power source, the second power component configured to operate in response to the second control signal to generate a second component of the at least one electrosurgical waveform;

a first stabilization amplifier coupled to the first power component, the first stabilization amplifier configured to introduce an error correction current into the electrosurgical waveform based on DC bias current flowing from the first power component; and

a controller configured to adjust at least one of the arbitrary RF signal and the phase control signal in response to at least one selected electrosurgical operational mode.

15. The electrosurgical generator according to claim 14, wherein the RF amplifier includes:

a first gain selector configured to provide a first gain control adjustment to the first control signal based on a first gain control signal provided by the controller; and

a second gain selector configured to provide a second gain control adjustment to the second control signal based on a second gain control signal provided by the controller.

16. The electrosurgical generator according to claim 15, wherein the RF amplifier includes:

a first gain amplifier coupled to the first error correction amplifier and the first gain selector, the first gain amplifier configured to adjust the first control signal based on the gain control adjustment; and

a second gain amplifier coupled to the second error correction amplifier and the second gain selector, the second gain amplifier configured to adjust the second control signal based on the gain control adjustment.

17. The electrosurgical generator according to claim 14, wherein the RF amplifier includes:

a first current sensor coupled to the first power component, the first current sensor configured to provide a signal representative of the first electrosurgical waveform to the first error correction amplifier; and

a second current sensor coupled to the second power component, the second current sensor configured to provide a signal representative of the second electrosurgical waveform to the second error correction amplifier.

18. The electrosurgical generator according to claim 17, wherein the RF amplifier includes:

a first frequency compensation network coupled to the first current sensor; and

a second frequency compensation network coupled to the second current sensor.