Testing

Test Data

            Waveforms of the stimulus current and the cochlear response were recorded for the implanted electrode. The testing data for the first two electrodes in the array is provided below:

          The figure above shows three waveforms that were recorded from the first electrode in the array. The threshold current for the electrode was found to be 90 μA. This value is defined as the minimum stimulus current that must be passed through the electrode to generate a response from the cochlea. This value was verified by the sponsor to be an acceptable threshold current.

            The other waveforms in the above figure show that the cochlear response is directly related to the amplitude of the stimulus current. The red arrows indicate the response of the cochlea to a stimulus signal. As can be seen in the figures, a higher stimulus current generates higher amplitude in the cochlear response. This is what was expected and further verifies that the electrodes are functioning properly.