Patent ID: 7083615

Claim:
A surgical instrument for use with a robotic surgical system, the instrument comprising: an elongate shaft having a proximal end and a distal end and defining an internal longitudinally extending passage; an electrocautery end effector disposed at the distal end of the shaft; an interface disposed at the proximal end of the shaft, the interface removably connectable to the robotic surgical system; a conductor extending from the interface to the end effector so as to deliver electrical energy to tissue engaged by the end effector, an insulation tube extending within the passage and over the conductor; and at least two o-rings disposed within the insulation tube so as to seal the insulation tube at each of its ends while centering the conductor within insulation tube, wherein an interior of the insulation tube between the sealed ends is filled with a filler material down to the conductor so as to inhibit capacitive coupling between the shaft and a surgical patient.