Fetal heart rate monitoring apparatus

Details Fetal heart rate monitoring apparatus Fetal heart rate monitoring apparatus

1974-08-09

1976-01-27

Kamm, William E.

Surgery

Truss

Perineal

73 687, 128 205Z, A61B 502

Patent

active

039345777

ABSTRACT:
Ultrasonic apparatus for monitoring heartbeat activity from electrical Doppler signals derived from heartbeat motion comprising means for selective passing of the electrical Doppler signals at one of two operable bandpass ranges to a retunable resonant circuit which de-emphasizes non-resonant frequency content, means for detecting a phase shift between the input signals to and output signals from the resonant circuit to retune it at a preselected rate, and means for inhibiting the phase detector operation with one of two operable refractory periods to prevent artifact from showing as a phase shift, whereby the operable bandpass ranges and refractory period are in response to separate preselected recorded heart rate values.

REFERENCES:
patent: 3554188 (1971-01-01), Lasch et al.
patent: 3605723 (1971-09-01), King et al.
patent: 3763851 (1973-10-01), Haff et al.

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