Method and system for programming and controlling an electrosurgical generator system

• US 8,012,150 B2
• Filed: 04/30/2004
• Issued: 09/06/2011
• Est. Priority Date: 05/01/2003
• Status: Expired due to Fees

• Current Assignee: Covidien AG (Medtronic Plc)
• Original Assignee: Covidien AG (Medtronic Plc)
• Inventors: Faulkner, William D., Wham, Robert H., Sturm, Thomas A.
• Primary Examiner(s): Yao; Sam Chuan
• Assistant Examiner(s): Roane; Aaron
• Application Number:
  US10/835,657
• Publication Number:
  US 20050004564A1
• Time in Patent Office: 2,685 Days
• Field of Search: 606 32- 52
• US Class Current: 606/38
• CPC Class Codes: A61B 18/1206 Generators therefor
• CPC Class Codes: A61B 2017/00084 Temperature
• CPC Class Codes: A61B 2018/00648 using more than one sensed parameter
• CPC Class Codes: A61B 2018/00702 Power or energy
• CPC Class Codes: A61B 2018/00773 Sensed parameters
• CPC Class Codes: A61B 2018/00779 Power or energy
• CPC Class Codes: A61B 2018/00791 Temperature
• CPC Class Codes: A61B 2018/00875 Resistance or impedance
• CPC Class Codes: A61B 2018/00892 Voltage

Abstract

A method and system are disclosed enabling configuration of a control system for an electrosurgical generator system for creating new surgical applications without changing the underlying software system. The system includes an outer loop controller for generating a control signal in accordance with at least a first subset of sensor data from at least one sensor; an inner loop controller for generating a setpoint control signal which is provided to an RF stage in accordance with at least the control signal generated by the outer loop controller and a second subset of sensor data from the at least one sensor; and a configuration controller for generating configuration data and providing first and second configuration data sets of the configuration data to the inner loop and outer loop controllers, respectively, for configuration thereof to provide a type of control selectable from a variety of types of control.

Claims

1. A programmable electrosurgical generator system having an RF output stage for outputting at least one RF operating waveform for performing an electrosurgical procedure, the programmable electrosurgical generator comprising:

a sensor module having at least one sensor for sensing electrical and physical properties responsive to the application of the electrosurgical energy and generating electrical and physical property sensor data corresponding to the sensed electrical and physical properties;

an inner loop system comprising means for changing at least one parameter of the at least one RF operating waveform to sculpt the at least one RF operating waveform based on sensor inputs received from the at least one sensor, the inner loop system including a control curve configured to selectively enable one of three modes of operation, the inner loop system configured to automatically switch between the three modes of operation based on feedback from the at least one sensor configured to sense load impedance and associated impedance breakpoints including Zlow and Zhigh, the three modes of operation selected from the group consisting of constant current, constant voltage and constant power, wherein the inner loop system computes a gain multiplier that is computed by taking an inverse of a voltage response corresponding to a sensed load impedance;

an outer loop system comprising means for providing at least one operating command to the inner loop system, the outer loop system including an outer loop control module that controls outer loop gain, the outer loop control module multiplying the outer loop gain by the gain multiplier computed by the inner loop system to stabilize overall gain of the electrosurgical generator system despite variations in the sensed load impedance, wherein the inner loop system and the outer loop system use the electrical and physical property sensor data as a parameter to employ one of the changing means and the providing means, respectively; and

a configuration control system for modifying at least one of the inner and outer loop systems based on received data,

wherein the inner loop system is configured to generate a target signal and plot at least one graph based on the control curve such that the constant current mode is operable when the sensed load impedance is equal to or lower than Zlow, the constant power mode is operable when the sensed load impedance greater than Zlow and lower than Zhigh, and the constant voltage mode is operable when the sensed load impedance is equal to or greater than Zhigh.

2. The electrosurgical generator system as in claim 1, wherein the at least one parameter is selected from the group consisting of output power, output current, output voltage, and output waveform pattern.

3. The electrosurgical generator system as in claim 2, wherein the inner loop system selectively controls the output current over a load impedance that is less than Zlow.

4. The electrosurgical generator system as in claim 2, wherein the inner loop system selectively controls the output voltage over a load impedance that is greater than Zhigh.

5. The electrosurgical generator system as in claim 2, wherein the inner loop system selectively controls the output power over a load impedance that ranges from Zlow to Zhigh.

6. The electrosurgical generator system as in claim 1, further comprising a high level RF Algorithm module for programming at least one of at least one algorithm and an algorithm parameter for the at least one algorithm of at least one of the inner loop system and the outer loop system based on received sensor data from a sensor module sensing properties associated with at least one of the electrosurgical procedure and the output of at least one RF operating waveform.

7. The electrosurgical generator system as in claim 1, further comprising a user interface for inputting and providing to the configuration control system programming commands for operating at least one of the inner loop system, the outer loop system and the configuration control system in accordance with the programming commands.

8. The electrosurgical generator system as in claim 7, further comprising at least one memory module for storing the inputted programming commands as command files.

9. The electrosurgical generator system as in claim 8, wherein each command file defines values of various parameters of an operating mode.

10. The electrosurgical generator system as in claim 1, wherein the at least one sensor is selected from the group consisting of current, phase shift, voltage, power, impedance, and temperature sensors.

11. The electrosurgical generator system as in claim 1, wherein the inner loop and outer loop systems use different subsets of the sensor data.

12. The electrosurgical generator system as in claim 1, further comprising at least one processor for creating and storing a plurality of operating modes for the electrosurgical generator system.

13. The electrosurgical generator system as in claim 1, wherein the configuration control system is adapted to re-program the inner and outer loop systems in virtual real-time.

14. A programmable electrosurgical generator system having an RF output stage for outputting at least one RF operating waveform for performing an electrosurgical procedure, the programmable electrosurgical generator comprising:

a sensor module having at least one sensor for sensing electrical and physical properties responsive to the application of the electrosurgical energy and generating electrical and physical property sensor data corresponding to the sensed electrical and physical properties;

an inner loop system comprising means for changing at least one parameter of the at least one RF operating waveform to sculpt the at least one RF operating waveform based on sensor inputs received from the at least one sensor, the inner loop system including a control curve configured to selectively enable one of three modes of operation, the inner loop system configured to automatically switch between the three modes of operation based on feedback from the at least one sensor configured to sense load impedance and associated impedance breakpoints including Zlow and Zhigh, the three modes of operation selected from the group consisting of constant current, constant voltage and constant power, wherein the inner loop system computes a gain multiplier that is computed by taking an inverse of a voltage response corresponding to a sensed load impedance;

an outer loop system comprising;

means for determining a target value based on a predetermined target curve;

means for performing at least one operating function of the electrosurgical generator,

the outer loop system using the electrical and physical property sensor data and the target value as a parameters to employ the performing means, the outer loop system including an outer loop control module that controls outer loop gain, the outer loop control module multiplies the outer loop gain by the gain multiplying computed by the inner loop system to stabilize overall gain of the electrosurgical generator system despite variations in the sensed load impedance; and

a configuration control system comprising means for modifying the inner and outer loop systems based on received input data,

wherein the inner loop system is configured to generate a target signal and plot at least one graph based on the control curve such that the constant current mode is operable when the sensed load impedance is equal to or lower than Zlow, the constant power mode is operable when the sensed load impedance greater than Zlow and lower than Zhigh, and the constant voltage mode is operable when the sensed load impedance is equal to or greater than Zhigh.

15. The electrosurgical generator system as in claim 14, wherein the at least one parameter is selected from the group consisting of output power, output current, output voltage, and output waveform pattern.

16. The electrosurgical generator system as in claim 15, wherein the inner loop system selectively controls the output current over a load impedance that is less than Zlow.

17. The electrosurgical generator system as in claim 15, wherein the inner loop system selectively controls the output voltage over a load impedance that is greater than Zhigh.

18. The electrosurgical generator system as in claim 15, wherein the inner loop system selectively controls the output power over a load impedance that ranges from Zlow to Zhigh.

19. The electro surgical generator system as in claim 14, wherein the at least one operating function is selected from the group consisting of receiving input information from at least one sensor, and providing at least one operating command to the means for changing the at least one parameter of the at least one operating waveform.

20. The electrosurgical generator system as in claim 14, further comprising a high level RF algorithm module for programming at least one of an operating parameter and an operating of at least one of the inner loop system and the outer loop system based on received sensor data from a sensor module sensing properties associated with the electrosurgical procedure.

21. The electrosurgical generator system as in claim 14, further comprising means for receiving programming commands for operating the inner loop system, the outer loop system and the configuration control system in accordance with the programming commands, and means for inputting the programming commands.

22. The electrosurgical generator system as in claim 21, further comprising at least one memory module for storing the inputted programming commands as command files.

23. The electrosurgical generator system as in claim 22, wherein each command file defines values of various parameters of an operating mode.

24. The electrosurgical generator system as in claim 14, wherein the at least one sensor is selected from the group consisting of current, phase shift, voltage, power, impedance, and temperature sensors.

25. The electrosurgical generator system as in claim 14, further comprising processing means for creating and storing a plurality of operating modes for the electrosurgical generator system.

26. The electrosurgical generator system as in claim 14, wherein the means for modifying is adapted to re-program the inner and outer loop systems in real-time.