Based on what we have covered so far, if we add an anodic stimulus to the tripolar configuration we could expect that the steering field will push the excitation limits away from the steering anode. The cuff-nerve-tissue relationship is the same for the tripolar electrode with anodic steering electrode added. The application of a -1.707 V stimulus to the cathode, which is made up of a -1.150 stimulus applied between the center contact and the flanking return electrodes and a -0.557 V return for the steering anode. As the boundaries for 20 µm fibers and doubling the stimulus amplitude are reveled, glance over to the same tripolar configuration without steering to see the effect of field steering.
RR Chintalacharuvu, DA Ksienski, JT Mortimer, Annual Int Conf of the IEEE Engr in Med and Biol Vol 13, No 2 1991, pp 0912-13
Rekha R. Chintalacharuvu, A Numerical Analysis of the Electric Field Generated by the Nerve Cuff Electrode, MS thesis, 1991 Case Western Reserve University