Method and apparatus for discriminating between electromagnetic interference signals and electromedical scanning signals, particularly of cardiological implants
First Claim
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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Abstract
A method for discriminating between externally-radiated, electromagnetic interference signals and electromedical scanning signals comprises the following steps: the preamplification of the scanning signals by means of two preamplifiers; the comparison of the preamplified scanning signals by a comparator; the phase-sensitive evaluation of the comparator output signal for differentiating between scanning signals and interference signals; the feedback of the comparator output signal to the amplification control of the preamplifiers such that the comparator output signal is minimized when an interference signal is detected.
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Citations
4 Claims
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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:
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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. - View Dependent Claims (2, 3, 4)
a respective preamplifier (7, 8) for scanning signals (CARD); a comparator (9), which is connected by its inputs to outputs of the preamplifiers (7, 8);
an amplification-control circuit (10), which is connected between the output of the comparator (9) and amplification-control inputs (11, 12) of the preamplifiers (7, 8); and
an evaluation circuit (13), which is disposed upstream of the amplification-control circuit (10) for phase-sensitive evaluation of the comparator output signal to differentiate between scanning signals (CARD) and interference signals (EMI).
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Specification