Surgery – Truss – Pad
Patent
1984-11-05
1986-02-11
Kamm, William E.
Surgery
Truss
Pad
128663, A61B 504
Patent
active
045693560
ABSTRACT:
A fetal heartbeat signal detected by the principle of an ultrasonic Doppler effect is autocorrelated, and a fetal heart rate is detected from the periodicity of peaks of a determined autocorrelation function. In such a process, peaks of the autocorrelation function are detected, and a peak truly indicative of the fetal heart rate is detected from closeness of righthand inclindations of the peaks to a righthand inclination of the origin of the autocorrelation function.
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Takeuchi et al., "An Adaptive Correlation Rate Meter: A New Method for Doppler Fetal Heart Rate Measurements", Ultrasonics, May 1978, vol. 16, No. 3, pp. 127-137.
Courtin et al., "A Versatile, Semiautomatic Fetal Monitor for Non Technical Users", Hewlett-Packard Journal, Jan. 1977, vol. 28, No. 5, pp. 16-23.
Kamm William E.
Nihon Kohden Corporation
Shein Mitchell J.
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