Method and apparatus for calculating the fetal heart rate

Details Method and apparatus for calculating the fetal heart rate Method and apparatus for calculating the fetal heart rate

1991-03-28

1992-12-15

Howell, Kyle L.

Surgery

Truss

Pad

128696, 128698, 12866104, A61B 800

Patent

active

051707918

ABSTRACT:
Determining the fetal heart rate comprises irradiating an ultrasound beam in the direction of the fetal heart. The moving parts of the fetal heart cause a Doppler shift which is used to determine the fetal heart rate via an autocorrelation function. Moving parts of the fetal heart with different velocities and Doppler shifts originating from other physiological sources generate secondary maxima in the autocorrelation function, so that an accurate heart rate determination becomes nearly impossible. This problem is overcome by parallel processing of the demodulated ultrasound signal in various pass-bands, for which purpose the signal is fed to filters (28, 30) of different frequency characteristics. The output of the pass band with the better result is used for fetal heart rate circulation.

REFERENCES:
patent: 3982528 (1976-09-01), Phillipps
patent: 3991365 (1976-11-01), Takeuchi
patent: 4211237 (1980-07-01), Nagel
patent: 4456959 (1984-06-01), Hirano et al.
patent: 4537200 (1985-08-01), Widrow
patent: 4569356 (1986-02-01), Kyozuka

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