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Electrical nerve and muscle stimulation by radio frequency surgery: role of direct current loops around the active electrode

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4 Author(s)
Slager, C.J. ; Rotterdam Univ. Hospital, Netherlands ; Schuurbiers, J.C.H. ; Oomen, J.A.F. ; Bom, N.

Tissue cutting by electrosurgery is often accompanied with stimulation of nerves and muscles, despite the high frequency of the alternating current being applied. The main source of the stimulation is thought to be the generation of a low-frequency current by the nonlinear sparking process. However, measurement of this low-frequency current in the generator electrode's circuit showed relatively small values, barely sufficient to support this hypothesis. In this study a more powerful low-frequency current could be identified, also originating from the nonlinear sparking process. Local direct and low-frequency currents, at a level of tens of milliamperes, appeared to be generated between different sites of the active-electrode-tissue interface. Probably these local currents have not been noticed before as they cannot be detected in the outer chain of generator, electrodes, and connecting wires. This finding may explain why most measures intended to prevent stimulation by modifying this outer chain have had only limited success.

Published in:

Biomedical Engineering, IEEE Transactions on  (Volume:40 ,  Issue: 2 )

Date of Publication:

Feb. 1993

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