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Method and apparatus for discriminating between electromagnetic interference signals and electromedical scanning signals, particularly of cardiological implants

  • US 6,421,555 B1
  • Filed: 06/16/2000
  • Issued: 07/16/2002
  • Est. Priority Date: 06/17/1999
  • Status: Expired due to Term
First Claim
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1. A method of discriminating between externally-radiated, electromagnetic interference signals and electromedical scanning signals, particularly in input signals of cardiological implants such as cardiac pacemakers, defibrillators or the like, in neurological stimulus detectors, etc., the method comprising the following steps:

  • preamplification of the scanning signals by means of two preamplifiers (7, 8);

    comparison of the preamplified scanning signals by a comparator (9);

    p1 phase-sensitive evaluation of the comparator output signal for differentiating between scanning signals (CARD) and interference signals (EMI); and

    feedback of the comparator output signal to an amplification control of the preamplifiers (7, 8) such that the comparator output signal is minimized when an interference signal is detected.

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