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Calibration system for pacemaker-generated intracardiac electrogram

  • US 5,620,473 A
  • Filed: 03/08/1995
  • Issued: 04/15/1997
  • Est. Priority Date: 03/08/1995
  • Status: Expired due to Term
First Claim
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1. A cardiac pacemaker system comprising:

  • an implanted pacemaker, the pacemaker having means for sensing intracardiac electrogram (IEGM) signals and means for telemetering such IEGM signals to a remote receiver;

    an external programmer in telemetered contact with the implanted pacemaker, the programmer having;

    receiver means for receiving the IEGM signals telemetered from the implanted pacemaker,processing means for processing the received IEGM signals for display, anddisplay means for displaying the processed IEGM signals as a function of a selected time base;

    the implanted pacemaker further having;

    means for generating a plurality of voltage reference signals, each having a fixed magnitude,means responsive to a calibrate signal for inserting a prescribed sequence of the plurality of voltage reference signals in a data stream of the sensed IEGM signals telemetered to the programmer, andimplanted receiver means for receiving control signals from the external programmer; and

    the external programmer further having;

    means for selectively generating the calibrate signal, andmeans for coupling the calibrate signal to the implanted receiver, thereby causing the prescribed sequence of the plurality of voltage reference signals to be included in the data stream received from the implanted pacemaker;

    whereby the sequence of voltage reference signals, when selectively inserted into the data stream of the sensed IEGM signals, becomes part of the IEGM signals displayed by the display means of the external programmer, andwhereby the fixed magnitude of the plurality of voltage reference signals thus displayed can be used to calibrate the display of the IEGM.

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