In bipolar technique, what is the effect of using equal-size electrodes on current distribution?

In bipolar technique, what is the effect of using equal-size electrodes on current distribution?

• A. Higher current under one electrode
• B. Essentially equal current density under both electrodes
• C. No current flow
• D. Circuit open

Answer: (B)

In bipolar stimulation, current flows between the two electrodes through the tissue. The current density under an electrode is roughly current divided by the electrode’s contact area (J ≈ I/A). When the electrodes are the same size, they present the same area to the tissue, so the same amount of current results in about the same current density under both electrodes. This symmetry helps produce a more uniform effect on the tissue under each electrode. If the sizes differed, the larger electrode would have lower current density and the smaller one higher, creating an uneven distribution.

In bipolar stimulation, current flows between the two electrodes through the tissue. The current density under an electrode is roughly current divided by the electrode’s contact area (J ≈ I/A). When the electrodes are the same size, they present the same area to the tissue, so the same amount of current results in about the same current density under both electrodes. This symmetry helps produce a more uniform effect on the tissue under each electrode. If the sizes differed, the larger electrode would have lower current density and the smaller one higher, creating an uneven distribution.