Alternate power correction outputs in electrosurgical systems
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.
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.