Surgery – Truss – Pad
Patent
1991-02-21
1992-05-05
Kamm, William E.
Surgery
Truss
Pad
36441306, A61B 5048
Patent
active
051098628
ABSTRACT:
A frequency domain signal processing and analysis method and apparatus displays, plots and makes measurements upon electrocardiographic signals (ECG) recorded from the body surface. Both the graphic plots and the numeric parameters measured reveal abnormalities of electrical conduction within the heart thought to be important in the identification of patients at risk of serious disturbances of heart rhythm including sudden death. The invention employs Fourier analysis of short overlapping segments of ECG signal to create a three dimensional map ("spectrocardiogram") whose axes are time, fequency and power thus disclosing changes in the frequency content of the ECG signal over short intervals of time. In additoin to the Fourier analysis itself, the method and apparatus provides a wide choice of user-selectable signal pre-processing, post-processing, display and plotting options as well as performing custom mathematical computations upon the Fourier spectra to distinguish and quantify visually apparent differences between normal and abnormal spectrocardiograms.
REFERENCES:
patent: 4630204 (1986-12-01), Mortara
patent: 4802491 (1989-02-01), Cohgn et al.
patent: 4924875 (1990-05-01), Chamoun
Henkin Raphael
Kelen George J.
Chapin William
Del Mar Avionics
Kamm William E.
Leimbach J. D.
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