Interface module allowing delivery of tissue stimulation and electrosurgery through a common surgical instrument

1. An interface module for simultaneous use with an electrical stimulation generator and an electrosurgical unit, the interface module comprising:

a first input configured to receive electrical stimulation signals for evoked potential monitoring for locating a nerve, from the electrical stimulation generator;

a first set of relays coupled to the first input;

a second input apart from the first input and configured to receive radio frequency signals from an RF generator of the electrosurgical unit;

a second set of relays coupled to the second input;

wherein the interface module is configured such that the first input and second inputs simultaneously receive the electrical stimulation signals and the radio frequency signals, respectively, the electrical stimulation signals differing from the radio frequency signals;

an output configured to deliver output signals to a single instrument and coupled to the first set of relays and the second set of relays;

a signal detector configured to receive an indication to deliver only one of the electrical stimulation signals and the radio frequency signals as the output signals at a time; and

a controller coupled to the first input, the second input, the signal detector, the first set of relays and the second set of relays, the controller configured to selectively energize the first set of relays and the second set of relays based on the indication from the signal detector so as to deliver the corresponding electrical stimulation signals or radio frequency signals to the output.

2. The interface module of claim 1 wherein the signal detector receives the indication from a selection module.

3. The interface module of claim 2 wherein the selection module is one of a mechanical switch and an electrical switch.

4. The interface module of claim 1 , wherein the first set of relays and the second set of relays are vacuum sealed.

5. The interface module of claim 1 , further comprising a housing maintaining the controller, the signal controller, and the inputs, the housing further including an insulating wall separating the first input and the second input.

6. The interface module of claim 5 , wherein the insulating wall is formed of polyoxymethylene.

7. The interface module of claim 1 , further comprising an indicator providing a visual reference of the indication.

8. The interface module of claim 1 wherein the radio frequency signals are configured for coagulation of tissue.

9. The interface module of claim 1 wherein the radio frequency signals are configured for cutting of tissue.

10. The interface module of claim 1 , wherein the first input includes a first input positive contact and a first input negative contact, and further wherein a first relay of the first set of relays is coupled to the first input positive contact, and a second relay of the first set of relays is coupled to the first input negative contact.

11. The interface module of claim 10 , wherein the output includes an output positive contact and an output negative contact, and further wherein the first relay is coupled to the output positive contact and the second relay is coupled to the output negative contact.

12. The interface module of claim 10 , wherein the second input includes a second input positive contact and a second input negative contact, and further wherein a first relay of the second set of relays is coupled to the second input positive contact, and a second relay of the second set of relays is coupled to the second input negative contact.

13. The interface module of claim 12 , wherein the output includes an output positive contact and an output negative contact, and further wherein the first relay of the first set of relays and the first relay of the second set of relays are coupled to the output positive contact, and the second relay of the first set of relays and the second relay of the second set of relays are coupled to the output negative contact.