Biomedical Engineering Reference
In-Depth Information
Figure 6.6. Microcontact films for electrical stimulation of the retina.
electrodes of film A have the diameters 50 and 100m. Film B has segmented
electrodes with effective electrode diameters of 50, 200 and 360m.
The electrodes of the microcontact film were tested by impedance spectroscopy
at frequencies ranging from 1 to 100 kHz. Figure 6.7 shows the impedance plot
of a single 360m electrode. The impedance at 1 kHz is 4 k.
Figure 6.7. Impedance plot of a single 360m electrode in a 0.9% NaCl solution. The
impedance magnitude is shown in black and the phase angle in gray.
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