Medical device ECG marker for use in compressed data stream

  • US 7,016,721 B2
  • Filed: 10/10/2001
  • Issued: 03/21/2006
  • Est. Priority Date: 07/14/1999
  • Status: Expired due to Term
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First Claim
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1. A method comprising:

  • monitoring an electrogram signal to find a trigger event in the electrogram signal, wherein said electrogram signal is obtained via at least a pair of subcutaneous electrodes spaced from a heart;

    generating a trigger indicator signal upon finding the trigger event;

    recording a plurality of sampled values of the electrogram signal in a memory structure; and

    recording the trigger indicator signal in the memory structure contemporaneously with the recording of the sampled values of the electrogram signal, wherein recording the trigger indicator signal in the memory structure comprises replacing one of the sampled values with the trigger indicator signal and wherein the trigger event comprises detection of out-of-range values of the electrogram signal.

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