Surgery – Truss – Pad
Patent
1978-02-15
1980-05-13
Kamm, William E.
Surgery
Truss
Pad
128702, A61N 136
Patent
active
042023408
ABSTRACT:
Disclosed is a method and an apparatus for monitoring heart activity, for indicating or detecting abnormalities in such activity, and for taking corrective measures to return an arrhythmic heart to normal sinus rhythm. In one embodiment, monitoring and detecting are accomplished by developing a probability density function from ECG signals, or by sampling at least two portions of a probability density function. In another embodiment, a phase lock loop circuit is utilized to indicate fibrillation by the loop's inability to lock onto R--R interval signals. And in still another embodiment, cardiac electrodes are used to sense pulsatile impedance changes, absent in the presence of fibrillation. Also disclosed is a two-stage detector whose second stage is brought out of a stand-by state only after an arrhythmic condition is indicated by the first stage.
REFERENCES:
patent: 3352300 (1967-11-01), Rose
patent: 3587563 (1971-06-01), Ragsdale
patent: 3716059 (1973-02-01), Welborn et al.
patent: 3811428 (1974-05-01), Van Horn et al.
Ottonello, "English Journal of Physics", vol. 7, No. 11, Nov. 1974, pp. 878-879.
Stratbucker et al., "Rocky Mountain Engineering Society," 1965, pp. 57-61.
Heilman Marlin S.
Langer Alois A.
Mirowski Mieczyslaw
Mower Morton M.
Kamm William E.
Mirowski Mieczyslaw
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