Fetal heart monitoring

A fetal heart and monitoring system technology, applied in the measurement of pulse/heart rate, medical science, diagnosis, etc., can solve problems such as undetected fetal heart

Inactive Publication Date: 2011-08-24
KCI LICENSING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even when the transducer is subsequently moved to such as figure 2 Although the fetal heart (6) is now in the beam (3) in the correct position shown in , the system does not detect the fetal heart because the heart is not inside the sensitive area (5)

Method used

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  • Fetal heart monitoring
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Examples

Experimental program
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Embodiment Construction

[0026] refer to image 3 , the present invention uses multiple gating where the beam is partitioned into four sensitive regions, but more or fewer regions are possible. The zones (7, 8, 9, 10) are shown non-overlapping for clarity, but by choosing the appropriate opening and closing times for each gate, taking into account the duration of the firing pulse, the zones can be made overlap to any desired extent or indeed have gaps in between.

[0027] In this example, one received signal is split into four components, each from a different depth. As with adaptive range gating, each signal benefits from a reduced noise level because it originates from a smaller volume. Gates 1 and 3 (7 and 9) contain only aperiodic noise. Gates 2 and 4 (8 and 10) contain periodic signals from which fetal and maternal heart rates can be inferred. Standard heart rate algorithms are able to extract both rates simultaneously and without confusion because the signals are already spatially separated....

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PUM

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Abstract

Fetal heart rate monitoring using ultrasound by means of a transducer in contact with the maternal abdomen. The transducer (11) is driven by a transmit amplifier (12), a receive amplifier (13) amplifies the echoes detected by the transducer. While the receive gate is open, demodulator (14) multiplies the received signal by the local oscillator signal. The sum of the frequencies is removed by low-pass filter (15), while the difference of the frequencies is the Doppler frequency of the received signal which passes through the filter to be digitised by ADC (16), the Rx gate opening a fixed delay after the end of the transmit pulse. A number of range bins are chosen and two ADC readings are made for each bin in intervals during the Rx gate-open interval. One or two of the Doppler audio signals, aperiodic or periodic, will contain the signal from the fetal heart. When a periodic signal is found, its rate is tested to see if it lies within or outside the typical range of a fetal heart.

Description

technical field [0001] The present invention relates to a method of monitoring heart rate, especially the heart rate of a fetus. Ultrasound is used to monitor the fetal heart with a transducer in contact with the pregnant woman's abdomen. Echoes from the fetal heart are processed to make heart sounds audible and analyzed to determine the fetal heart rate. Background technique [0002] Doppler Ultrasound Fetal Heart Rate Monitor uses high-frequency sound waves to subject the fetal heart and surrounding tissues to sound waves. Echoes from internal tissue experience a Doppler shift proportional to the relative velocity of the reflective surface and transducer. Demodulates the received ultrasound to convert the Doppler signal into the audible range; reassuring when the fetal heart can be heard in this manner. Filters are used to reject signals from stationary and slowly moving tissue, and processing algorithms are used to determine when each heartbeat occurred and thus the he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B8/02
CPCA61B8/02A61B8/0866
Inventor 罗伊·杰克逊
Owner KCI LICENSING INC
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