Patent ID: 6421555
Filing Date: 2002-07-16
Classification: A61N

Abstract:
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.