Surgery – Truss – Pad
Patent
1979-01-05
1980-12-23
Kamm, William E.
Surgery
Truss
Pad
A61B 504
Patent
active
042404428
ABSTRACT:
An improved R-wave detector is provided for use in monitoring and/or analyzing electrical heart waveforms. Generally conventional R-wave detection means employ automatically variable scaling means for providing a threshold or reference value to a comparator which is variable not only in magnitude but also as a percentage of the average R-wave peak value from which it is derived. An ECG waveform is compared with this threshold of automatically variable percentage value and an indication of R-wave occurrence is provided when the ECG waveform exceeds the threshold. Upon an indication of R-wave occurrence, the percentage value of the threshold is rapidly increased such that a closely following T-wave of unusually large magnitude is not falsely detected as an R-wave. Then, following the interval during which a T-wave might occur and before the possible occurrence of even a premature following R-wave, the percentage value of the threshold decreases to a level capable of detecting even such premature R-waves of reduced amplitude.
REFERENCES:
patent: 3087488 (1963-04-01), Streimer
patent: 3174478 (1965-03-01), Kahn
patent: 3572321 (1971-03-01), Bloomfield et al.
patent: 3580243 (1971-05-01), Johnson
patent: 3590811 (1971-07-01), Harris
patent: 3939824 (1976-02-01), Arneson et al.
Andresen Richard P.
Armington Robert M.
Cannon, III Robert L.
Griffin Andrew J.
American Optical Corporation
Duggan Jeremiah J.
Kamm William E.
Schneeberger Stephen A.
Spencer Alan H.
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