Surgery – Truss – Pad
Patent
1991-09-09
1993-11-09
Kamm, William E.
Surgery
Truss
Pad
128703, A61B 50402
Patent
active
052593878
ABSTRACT:
A filter system for removing small amplitude, high frequency signals such as muscle artifact signals from an ECG signal is provided. The filter system includes a low pass filter with variable cutoff frequencies, an electronic delay and a system for detecting the R wave in the ECG signal and determining the variable cutoff frequency in response to the detection of the R wave. A digitized input ECG signal is simultaneously presented to the electronic delay and the system for detecting the R wave. During the portion of the ECG signal exclusive of the QRS complex, the filter is operated at a low cutoff frequency to filter the muscle artifact signals for a maximum smoothing effect. At a time slightly prior to the on set of the QRS complex, the cutoff frequency is rapidly incrementally increased to a higher cutoff frequency to pass the QRS complex with a minimum reduction of amplitude of the QRS signal. At the end of the QRS signal, the cutoff frequency of the filter is rapidly incrementally returned to the low cutoff frequency.
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Beck Andrew J.
Getzow Scott M.
Kamm William E.
Kinghorn Curtis D.
Quinton Instrument Company
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