JPH071904U - Fetal monitoring device for multiple fetuses - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a fetal monitoring device for multiple fetuses capable of monitoring and recording the heart rate and fetal movement of multiple fetuses only by ultrasonic Doppler method. [Composition] A plurality of ultrasonic probes that operate at the same frequency and transmit and receive ultrasonic waves in a fetal monitoring device that detects the heart rate, fetal movement, etc. of the fetus inside the mother using the Doppler effect of the ultrasonic waves. 10, 20, means 11 and 21 for injecting ultrasonic waves of the same frequency from different positions on the surface of the mother body toward a plurality of target regions in the mother body, and a plurality of reflected waves of the ultrasonic waves from the plurality of regions. The ultrasonic probe 10, 20 is used to obtain the fetal heart rate for each Doppler signal from the Doppler signal obtained by each of the means 14, 24 for receiving each of the plurality of regions and the receiving means. A fetal monitoring apparatus for multiple fetuses, comprising heart rate counting circuits 17 and 27 for each receiving means.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fetus monitoring device, and more particularly to a fetal monitoring device having a function of monitoring and recording multiple fetuses.

[0002]

[Prior art]

 The fetal monitor is a device that measures fetal heart rate and maternal uterine contraction and records them simultaneously to diagnose the prognosis of the fetus, and plays an important role in managing high-risk pregnancy. In particular, multiple pregnancies tend to be high-risk pregnancies, so continuous monitoring of the fetal heart rate is absolutely necessary. Surveillance is considered for one person and is unsuitable for monitoring multiplets.

Therefore, a plurality of fetus monitoring devices are required to monitor multiple fetuses. However, in the conventional ultrasonic Doppler method, ultrasonic waves transmitted from a plurality of fetus monitoring devices interfere with each other, resulting in a difference in frequency. Occasionally, a beat occurred and fetal heartbeat could not be detected. For this reason, the heartbeat measuring method was changed, and one fetal monitoring device was measured by the ultrasonic Doppler method, and the other fetal monitoring device was measured by the electrocardiographic method or the heart sound method.

[0004]

[Problems to be solved by the device]

 However, the electrocardiography method can be used only after rupture of the membrane (membrane rupture) because the electrodes are attached directly to the fetal head. Therefore, the heart sound method has been mainly used, but due to its weakness in contact noise and external noise, only the ultrasonic Doppler method, which is currently the most popular non-invasive and more reliable fetal heartbeat detection method, is used. A multiplex monitoring device by Dr. An object of the present invention is to provide a fetus monitoring device for multiple fetuses, which eliminates the above-mentioned conventional problems and is capable of monitoring and recording the heart rate and fetal movement of multiple fetuses only by ultrasonic Doppler method. It is in.

[0005]

[Means for solving problems]

 In order to achieve the above-mentioned object, the present invention makes ultrasonic waves incident from different parts of the maternal surface by a plurality of probes, and again reflects ultrasonic waves from a plurality of target parts in the mother's body. The ultrasonic probe is configured to receive each part of the plurality of parts. In this case, it is an important requirement of the present invention to make the frequency of the ultrasonic waves from each probe the same, and by adopting such a configuration, interference between multiple ultrasonic waves can be avoided, and There are multiple target sites, and even if there are multiple fetuses, it is possible to obtain ultrasonic information of each fetus.

That is, when two ultrasonic Doppler method heartbeat detectors of the same model are used, the ultrasonic frequencies are similar but there are some differences. Then, during this period, a beat having a frequency difference between the two is generated, but if this is the target detection range of the Doppler frequency, the output of the detector will be an output due to an unnecessary beat. Moreover, since the reflected ultrasonic waves due to fetal heartbeat are weak, they produce a larger output than the target signal and cause interference such as saturation of the detector, which makes it impossible to achieve the purpose. It was

However, in the present invention, since each probe is supplied with an electric signal from the same oscillator to generate ultrasonic waves of the same frequency, the probe operates without causing the above-mentioned conventional inconvenience. Can be allowed to Further, in the present invention, since the fetal heart rate is obtained by the respective heart rate counting circuits from the Doppler signals respectively obtained from the plurality of ultrasonic probes, information is obtained from each of the plurality of regions. It is possible.

[0008]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in FIGS. The present example is an example for two twins, that is, for twins.

In FIGS. 1 and 2, reference numerals 10 and 20 denote ultrasonic probes, and inside thereof, transmitting ultrasonic transducers 12 and 22 and receiving ultrasonic transducers 13 and 23 are respectively described. It is attached and used by being mounted on the abdominal wall M of the mother's body as shown in FIG. An ultrasonic oscillator circuit 1 oscillates at a constant frequency. Reference numerals 11 and 21 denote ultrasonic wave transmission circuits, which are operated by an electric signal from the ultrasonic wave oscillating circuit 1 to output ultrasonic waves of the same frequency from the two ultrasonic wave transmitting elements 12 and 22 for transmission. The transmission ultrasonic transducer 12, 22, as shown in FIG. 2, so that each ultrasound hits the first pups S ₁ and the two children of S ₂ heart, pro - the blanking 10,20 maternal Wear on the abdominal wall M.

Thus, a part of the ultrasonic waves from the transmitting ultrasonic transducers 12 and 22 is reflected by the internal tissues of the first child S ₁ and the second child S ₂ and their boundary surfaces, respectively, and is again reflected by the mother's body. It returns to the surface of the abdominal wall M. Reference numerals 13 and 23 denote ultrasonic transducers for reception, which convert the reflected ultrasonic waves into electric signals, and the electric signals enter the ultrasonic wave receiving circuits 14 and 24. At this time, if the tissues or boundary surfaces in the body are moving, a signal having a frequency component of the difference between the received wave and the transmitted wave whose frequency is shifted by the Doppler effect, that is, the Doppler signal is received by the receiving circuits 14 and 2. 4 can be obtained. Then, the Doppler signals obtained from the receiving circuits 14 and 24 are taken out by the filters 15 and 25, only the Doppler signal component due to the fetal heartbeat, and the fetal heartbeat Doppler signals are detected by the detection circuits 16 and 26, and then the heart rate is counted. The circuits 17 and 27 convert the heart rate into a heart rate, and the recorder 4 simultaneously records the heart rate of each of the first child S ₁ and the second child S ₂ .

On the other hand, the labor signal detected by the strain gauge 2 on the abdominal wall M is amplified by the labor signal amplification circuit 3 and is also recorded by the recorder 4. The part relating to this labor is not included in the present invention, but since the present invention is often used with a labor signal recording system as shown in FIG. 1, it is described as an example at that time.

In the above-mentioned embodiment, the case of the double womb is described, but the number of the oscillator, the transmitter / receiver, the filter, the heart rate counting circuit and the recorder can be increased even in the case of multiple wombs of three or more wombs. Can handle. Also, in this example, the transducers for transmission are described as being separate, but the same transducer can be used for both transmission and reception by time-sharing transmission and reception. Although it is easy to use each probe provided with a transmitting / receiving oscillator in terms of directivity and operability, the probe is not necessarily limited to this, and a transmitting probe and a receiving probe may be provided separately. It is clear that the transmission and reception do not have to be paired, and can also be used in the configuration of, for example, one transmission probe and three reception probes.

[0013]

[Effect of device]

 As described above, the multiple fetus monitoring device according to the present invention is the same in the fetus monitoring device that detects the heart rate, fetal movement, etc. of the fetus in the mother's body from outside the mother by utilizing the Doppler effect of ultrasonic waves. A means for injecting ultrasonic waves of the same frequency from different positions on the surface of the mother body toward a plurality of target sites in the mother body by a plurality of ultrasonic probes that operate at a frequency and transmit and receive ultrasonic waves; Means for receiving the reflected waves of the ultrasonic waves from the respective parts by the plurality of ultrasonic probes for each part of the plurality of parts, and the fetal heartbeat for each of the doppler signals from the Doppler signals obtained by the respective receiving means. The heart rate counting circuit for each of the receiving means for obtaining the number is provided, so that the simultaneous heart rate of multiple fetuses and each fetal movement record can be obtained only by the Doppler signal, and their relations can be confirmed. it can There is a kind of effect.

[Brief description of drawings]

FIG. 1 is a block diagram of a multiple fetus monitoring device according to the present invention.

FIG. 2 is an explanatory diagram showing an example in which an ultrasonic probe is applied to the surface of a mother body.

[Explanation of symbols]

 1 Ultrasonic Oscillation Circuit 2 Strain Gauge 3 Labor Signal Amplification Circuit 4 Recorder 10 Ultrasonic Probe 11 Ultrasonic Transmitting Circuit 12 Ultrasonic Transducer 13 Transmitting Ultrasonic Transducer 14 Ultrasonic Receiving Circuit 15 Filter 16 Detection Circuit 17 Heart rate counting circuit 20 Ultrasonic probe 21 Ultrasonic transmission circuit 22 Ultrasonic transducer for transmission 23 Ultrasonic transducer for reception 24 Ultrasonic receiving circuit 25 Filter 26 Detection circuit 27 Heart rate counting circuit

Claims (1)

[Scope of utility model registration request] 1. In a fetus monitoring device for detecting the heart rate, fetal movement, etc. of a fetus in a mother from outside the mother by utilizing the Doppler effect of ultrasonic waves, a plurality of ultrasonic transmitters operating at the same frequency and transmitting and receiving ultrasonic waves. A means for injecting ultrasonic waves of the same frequency from different positions on the surface of the mother body toward a plurality of target regions in the mother body by means of an ultrasonic probe, and reflected waves of the ultrasonic waves from the plurality of regions being the plurality of ultrasonic waves. Means for receiving each part of the plurality of parts by a probe, and a heart rate counting circuit for each receiving means for obtaining a fetal heart rate for each Doppler signal from the Doppler signal obtained for each receiving means, A fetus monitoring device for multiple fetuses, comprising: