Alternate power correction outputs in electrosurgical systems

Patent metadata

Field	Value
Publication number	US-11666372-B2
Application number	US-202016874335-A
Country	US
Kind code	B2
Filing date	May 14, 2020
Priority date	May 9, 2019
Publication date	Jun 6, 2023
Grant date	Jun 6, 2023

Abstract

Apparatus and associated methods relate to controlling electrical power of an electrotherapeutic signal that is provided to a biological tissue engaged by an electrosurgical instrument during a medical procedure. Electrical power—a product of a voltage difference across and an electrical current conducted by the engaged biological tissue—is controlled according to a therapeutic schedule. The electrotherapeutic schedule can be reduced or terminated in response to a termination criterion being met. In some examples, the termination criterion is a current characteristic, such as, for example, a decrease in current conducted by the engaged biological tissue. In some examples, the termination criterion is a biological tissue resistance characteristic, such as, for example, an increase in the biological tissue resistance that exceeds a predetermined delta resistance value.

First claim

The invention claimed is:

1. A surgical system configured to compensate for phase angle measurement accuracy of a surgical system configured to deliver electrosurgical energy to an electrosurgical device, the surgical system comprising:
a control circuit; and
an output circuit coupled to the control circuit and configured to deliver the electrosurgical energy to an output terminal for delivery to a patient, the output terminal configured to couple to the electrosurgical device having two jaws with corresponding electrodes,
wherein the control circuit is configured to:
compare a representation of an impedance of biological tissue in electrical communication with the electrodes of the electrosurgical device to a first threshold;
in response to the representation of the impedance being less than the first threshold, select, from at least two power corrections:
a first power correction when the representation of the impedance is within a first range; and
a second power correction when the representation of the impedance is within a second range;

compensate for the phase angle measurement accuracy by applying the selected power correction to a power setting of a power generator coupled the electrosurgical device; and
control delivery of the electrosurgical energy to the electrosurgical device using the power setting.

2. The surgical system of claim 1 , wherein the control circuit is configured to:
compare a representation of at least one secondary parameter to at least one threshold; and
select, from the at least two power corrections, a third power correction when the representation of the at least one secondary parameter is less than the at least one threshold.

3. The surgical system of claim 2 , wherein the at least one secondary parameter includes one or more of an output current of the power generator, a tissue temperature, and a phase angle.

4. The surgical system of claim 1 , wherein the control circuit is configured to:
using the corrected power setting, deliver electrosurgical energy via the electrodes of the electrosurgical device during a period of time.

5. The surgical system of claim 4 , wherein the period of time is based at least on a range of impedance values.

6. The surgical system of claim 4 , wherein the period of time is based at least on an amount of delivered electrosurgical energy.

7. The surgical system of claim 1 , wherein the control circuit is configured to:
using the corrected power setting, deliver electrosurgical energy via the electrodes of the electrosurgical device; and
reduce the application of the selected first power correction to the power setting when the representation of impedance meets or exceeds a second threshold.

8. The surgical system of claim 1 , comprising:
using the corrected power setting, deliver electrosurgical energy via the electrodes of the electrosurgical device; and
dynamically adjust at least one of an upper limit and a lower limit of the first range when the representation of the impedance is within a predetermined percentage or value of the upper or lower limit.

9. A method of compensating for phase angle measurement accuracy of a surgical system configured to deliver electrosurgical energy to an electrosurgical device, the method comprising:
comparing a representation of an impedance of a biological tissue in electrical communication with two electrodes of the electrosurgical device to a first threshold;
in response to the representation of the impedance being less than the first threshold, selecting, from at least two power corrections:
a first power correction when the representation of the impedance is within a first range; and
a second power correction when the representation of the impedance is within a second range;

compensating for the phase angle measurement accuracy by applying the selected power correction to a power setting of a power generator coupled the electrosurgical device; and
controlling delivery of the electrical energy to the electrosurgical device using the power setting.

10. The method of claim 9 , comprising:
comparing a representation of at least one secondary parameter to at least one threshold; and
selecting, from the at least two power corrections, a third power correction when the representation of the at least one secondary parameter is less than the at least one threshold.

11. The method of claim 10 , wherein the at least one secondary parameter includes one or more of an output current of the power generator, a tissue temperature, and a phase angle.

12. The method of claim 9 , comprising:
using the corrected power setting, delivering electrosurgical energy via the electrodes of the electrosurgical device during a period of time.

13. The method of claim 12 , wherein the period of time is based at least on a range of impedance values.

14. The method of claim 12 , wherein the period of time is based at least on an amount of delivered electrosurgical energy.

15. The method of claim 9 , comprising:
using the corrected power setting, delivering electrosurgical energy via the electrodes of the electrosurgical device; and
reducing the application of the selected first power correction to the power setting when the representation of impedance meets or exceeds a second threshold.

16. The method of claim 9 , comprising:
using the corrected power setting, delivering electrosurgical energy via the electrodes of the electrosurgical device; and
applying a second power correction to the power setting when the representation of the impedance is a specified percentage above an upper limit of the first range.

Assignees

• Gyrus Acmi Inc

Inventors

• Batchelor Kester Julian
• Williams Wayne
• Breitsprecher Frank

Classifications

• A61B2018/00827

  Current · CPC title

• A61B18/1206 Primary

  Generators therefor · CPC title

• A61B2018/00892

  Voltage · CPC title

• A61B2018/00994

  combining two or more different kinds of non-mechanical energy or combining one or more non-mechanical energies with ultrasound · CPC title

• A61B2018/00666

  using a threshold value · CPC title