Electrosurgical systems

1. An electrosurgical system, comprising:

an electrosurgical generator including an RF energy output module and an energy request detection module both in communication with at least one processor of the electrosurgical generator, the RF energy output module outputting RF energy through a first transformer, and the energy request detection module in electrical communication with primary windings of a second transformer; and

an electrosurgical instrument configured to function in at least two modes of operation and including a housing, a treatment member and at least a first switch and a second switch, the first switch in electrical communication with the first transformer and coupled to secondary windings of the second transformer such that when the first switch is moved to a closed configuration the energy detection module detects an occurrence at the second transformer and provides a signal to the at least one processor to transmit electrosurgical energy to the electrosurgical instrument.

2. An electrosurgical system according to claim 1 , wherein the second transformer is one of a magnetic core or an air core transformer.

3. An electrosurgical system according to claim 1 , wherein the first switch is in a normally open configuration.

4. An electrosurgical system according to claim 3 , wherein a high inductive impedance is present on the primary windings of the second transformer when the first switch is in the normally open configuration and a low inductive impedance is present on the primary windings of the second transformer when the first switch is in a closed configuration.

5. An electrosurgical system according to claim 4 , wherein the occurrence detected by the energy request detection module is impedance.

6. An electrosurgical system according to claim 1 , further comprising a third transformer that is connected in parallel relation with respect to the second transformer and includes secondary windings connected to the second switch.

7. An electrosurgical system according to claim 6 , wherein each of the primary windings of the second and third transformers includes a respective resistor connected in series therewith.

8. An electrosurgical system according to claim 7 , wherein resistance values are different for each of the respective resistors and are correlated to a specific one of the first or second switches to indicate to the at least one processor which of the first or second switches is closed.

9. An electrosurgical system according to claim 7 , wherein resistance values are different for each of the respective resistors to provide unique oscillation frequencies that are correlated to a specific one of the first or second switches to indicate to the at least one processor which of the first or second switches is closed, the occurrence detected by the energy request detection module corresponding to an oscillator frequency of the respective resistors.

10. An electrosurgical system according to claim 6 , wherein each of the primary windings of the second and third transformers includes a respective capacitor connected in series therewith.

11. An electrosurgical system according to claim 10 , wherein capacitance values are different for each of the respective capacitors to provide unique resonant tank periods that are correlated to a specific one of the first or second switches to indicate to the at least one processor which of the first or second switches is closed, the occurrence detected by the energy request detection module corresponding to a resonant tank period of the primary windings of the second and third transformers and the respective capacitors.

12. An electrosurgical system according to claim 1 , wherein both of the secondary windings of the second transformer are connected to one of the secondary windings of the first transformer.

13. An electrosurgical system forceps according to claim 1 , wherein at least one of the secondary windings of the second transformer is in electrical communication with the first switch via a lead that is part of a cable that couples the electrosurgical instrument to the electrosurgical generator.

14. An electrosurgical system according to claim 1 , wherein the first switch is one of a handswitch switch operably disposed on the electrosurgical instrument and a footswitch in operable communication with the electrosurgical generator.

15. An electrosurgical system, comprising:

an electrosurgical generator including an RF energy output module and an energy request detection module both in communication with at least one processor of the electrosurgical generator, the RF energy output module outputting RF energy through a first transformer, and the energy request detection module in electrical communication with primary windings of a second transformer; and

an electrosurgical instrument including a housing, a treatment member and at least one switch, the at least one switch in electrical communication with the first transformer and coupled to secondary windings of the second transformer such that when the at least one switch is moved to a closed configuration the energy detection module detects an occurrence at the second transformer and provides a signal to the at least one processor to transmit electrosurgical energy to the electrosurgical instrument,

wherein at least one of the secondary windings of the second transformer is connected to one of the secondary windings of the first transformer and at least one of the secondary windings of the second transformer is connected to at least one lead that provides electrosurgical energy to one of a first or second jaw member of the electrosurgical instrument.