| 摘要 |
A calibration system for use with an implantable pacemaker allows the intracardiac electrogram (IEGM) generated by the pacemaker to be calibrated when the pacemaker is coupled to an external programmer. The calibration system includes telemetry circuits within both the pacemaker and programmer that allow data signals to be sent from the pacemaker to the programmer, and that allow command signals to be sent from the programmer to the pacemaker, in conventional manner. The system further includes circuitry within the pacemaker that generates a precision reference voltage as well as a zero reference voltage, and that selectively switches the precision reference voltage and/or the zero reference voltage into the IEGM data signals being telemetered to the external programmer from the pacemaker. The switching of the precision reference voltage and/or zero reference voltage into the IEGM data occurs within the pacemaker upon receipt of a special calibration command signal from the programmer. Such reference voltages, when thus included as part of the telemetry data received from the pacemaker, is thereafter included in the display or storage of the IEGM at the programmer, and may be used to scale the IEGM display so that it fits a calibrated n mv/div graticule. The precision reference voltage thus provides a known calibrated reference against which the IEGM can be compared in order to provide a true measure of its amplitude at any given time.
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