| 摘要 |
Monitoring/measurement circuitry within an implantable stimulator, e.g., an implantable cochlear stimulator (ICS), includes a first analog multiplexer (MUX) connected to a gain controlled, low noise, differential amplifier. The output of the differential amplifier is coupled to a second analog MUX along with other analog signals, e.g., operating or bias voltages used within the implantable stimulator. The signal appearing at the output of the second analog MUX is preliminary processed as required, e.g., to adjust the amplitude (attenuate) and/or filter out high frequency components. Once processed, the signal is then digitized in an analog-to-digital (A/D) converter. The digitized signal is then stored in memory as measured data, and eventually transmitted to a remote (non-implanted) processor for further processing, analysis, examination and/or feedback. Such monitoring/measurement circuitry may operate in a low power mode for frequent monitoring of certain signals selected by the second analog MUX, and a high power mode for less frequent monitoring of other signals, e.g., an evoked potential, selected by the first analog MUX. When sensing an evoked response, all signal activity associated with an applied stimulus, including the artifact and the evoked response, may be sensed, monitored, preliminarily processed, and stored in real time, and then subsequently telemetered to the remote signal processing device. The remote signal processing device may then apply additional signal processing to the received data, including removal of the artifact from the evoked response, thereby allowing the evoked response to be identified and analyzed and used.
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