JPS60176630A - Fetal movement detector - Google Patents
Fetal movement detectorInfo
- Publication number
- JPS60176630A JPS60176630A JP3200284A JP3200284A JPS60176630A JP S60176630 A JPS60176630 A JP S60176630A JP 3200284 A JP3200284 A JP 3200284A JP 3200284 A JP3200284 A JP 3200284A JP S60176630 A JPS60176630 A JP S60176630A
- Authority
- JP
- Japan
- Prior art keywords
- fetal
- signal
- fetal movement
- detection device
- heartbeat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Ultra Sonic Daignosis Equipment (AREA)
- Measuring And Recording Apparatus For Diagnosis (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
本発明は、胎動すなわち胎児の子宮内にお&Jる運動を
検出する装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for detecting fetal movements, that is, movements of a fetus within the uterus.
胎動は胎児の生存状態を示す重要な指標としζ古くから
d三口されていた。Fetal movements have long been regarded as an important indicator of the viability of the fetus.
従来のこの種胎動の検出方法としては、母体が胎動を感
知したときにスイッチを押し記録計にマーカーを記録す
る方法が一般的であって、これは自覚的な方法でありす
べての胎動を記録できるとは限らず、また個人差や胎位
による差異も考慮する必要があり、充分な胎動計測とは
いえない欠点があった。また超音波断層診断装置により
胎動の映像を連続的に観察する方法もあるが、この方法
にもやはり観察者の主観的因子が介在し、しかも簡便な
連続記録は不可能であるという欠点があった。The conventional method for detecting fetal movements of this type is to press a switch and record a marker on a recorder when the mother detects fetal movements; this is a subjective method that records all fetal movements. However, it is not always possible to do so, and it is necessary to take into account individual differences and differences due to fetal position, which has the disadvantage that it cannot be said to be an adequate measurement of fetal movements. There is also a method of continuously observing images of fetal movements using an ultrasonic tomographic diagnostic device, but this method also has the drawbacks of being subject to subjective factors on the part of the observer and not being able to perform simple continuous recording. Ta.
本発明は、上記のような従来の欠点を除去し、胎動を連
続的かつ簡易に妊産+iilのヘソ1〜のそばで記録で
きしかもそれが客観的な記録である胎動検出装置を提供
することを目的とするものである。The present invention aims to eliminate the above-mentioned conventional drawbacks and to provide a fetal movement detection device that can continuously and easily record fetal movements near the navel 1 to 1 during pregnancy and delivery, and that is an objective record. This is the purpose.
以下図面に示す実施例により本発明の詳細な説明する。The present invention will be explained in detail below with reference to embodiments shown in the drawings.
第1図において1は超音波振動子で、妊産婦の腹壁上M
にテープまたはヘルドなどで固定しである。2は超音波
送信回路で、腹壁上Mがら体内に向は超音波を送信する
とこの超音波の一部は体内の組織やその界面などから反
射してふたたび体表面にかえってくる。3は超音波受信
回路で、上記反射波による情報を増幅しドプラ検出回路
4へおくる。このとき界面などが運動していると、ドプ
ラ効果による低周波のドプラ信号があられれる。In Figure 1, 1 is an ultrasound transducer, which is placed on the abdominal wall of a pregnant woman.
Secure it with tape or a heald. Reference numeral 2 denotes an ultrasonic transmitting circuit, which transmits ultrasonic waves into the body from above the abdominal wall M, and a portion of these ultrasonic waves are reflected from internal tissues and their interfaces and return to the body surface. 3 is an ultrasonic receiving circuit which amplifies information from the reflected waves and sends it to the Doppler detection circuit 4. If the interface or the like moves at this time, a low-frequency Doppler signal is generated due to the Doppler effect.
ドプラ信号の周波数は運動体の運動速度(、V)、超音
波周波数(F)、超音波速度(C)、入射角度(e)に
よって変わり、上述の場合に得られるドプラ信号につい
ては近似的にドプラ信号周波数Fd=F X (2VX
CO5θ)/Cである。すなわち運動速度に応した周
波数のドプラ信号が現れる。The frequency of the Doppler signal changes depending on the motion velocity of the moving body (,V), the ultrasound frequency (F), the ultrasound velocity (C), and the incident angle (e), and the Doppler signal obtained in the above case can be approximately Doppler signal frequency Fd=F
CO5θ)/C. In other words, a Doppler signal with a frequency corresponding to the speed of movement appears.
上記ドプラ検出回路4で検出したドプラ信号を胎動信号
用フィルタ5に通し、胎動による信号成分だけをと゛り
だした後これを胎動信号検波回路6で検波し、胎動信号
増幅回路7で増幅する。The Doppler signal detected by the Doppler detection circuit 4 is passed through a fetal movement signal filter 5 to extract only the signal component due to fetal movement, which is then detected by a fetal movement signal detection circuit 6 and amplified by a fetal movement signal amplification circuit 7.
前記胎動信号用フィルタ5は、胎児の心拍動から発生ず
る高い周波数の成分と妊産婦の腹壁又は生体内部で発生
ずる内臓の動きから発生ずる低い周波数を遮断できるも
のである。The fetal movement signal filter 5 is capable of blocking high frequency components generated from the heartbeat of the fetus and low frequencies generated from the abdominal wall of the expectant mother or the movement of internal organs inside the living body.
増幅回路7で増幅された胎動信号は、記録計8に入り振
幅として紙上に記録される。The fetal movement signal amplified by the amplifier circuit 7 enters the recorder 8 and is recorded on paper as an amplitude.
この記録で胎動の有無、大きさを知ることができる。This record allows us to know whether the fetus is moving or not and its size.
第2図に示すものは、本発明のその他の実施例である。What is shown in FIG. 2 is another embodiment of the invention.
この実施例においては、ドプラ検出回路4でドプラ信号
を検出した後の処理は上記実施例と同しであるが、この
ISSシラ号から胎児心拍動信号を抽出する胎児心拍動
信号抽出手段にも供給している点て異なる。ずなわら前
記ドプラ信号を心拍動信号用フィルタ9に通し、ドプラ
信号のうちから胎児心拍動による信号成分をとりだす。In this embodiment, the processing after the Doppler detection circuit 4 detects the Doppler signal is the same as in the above embodiment, but the fetal heartbeat signal extraction means for extracting the fetal heartbeat signal from the ISS Shira is also the same. They are different in terms of what they supply. The Doppler signal is then passed through a heartbeat signal filter 9, and a signal component due to the fetal heartbeat is extracted from the Doppler signal.
この胎児心拍動信号は、心拍動信号検波回路10で検波
した後ろ拍数1旧数回路1]にて心拍故に変換され、ニ
チートンネル記録計12乙こて胎動と同11.5′に紙
」二に記録される。この記(,1!、は、両−17とも
共通の時間・I・111を用いて記録されるため、心拍
数と胎動の関連をIIJ察することができる。This fetal heartbeat signal is detected by the heartbeat signal detection circuit 10 and converted into a heartbeat by the backbeat rate circuit 1], and is detected by the Nichi tunnel recorder 12. recorded in the second. Since this record (,1!) is recorded using the common time ・I・111 for both -17, it is possible to understand the relationship between heart rate and fetal movements.
つぎに、本発明の詳細な説明する。Next, the present invention will be explained in detail.
如産婦の腹壁上Mから体内に向りて、例えば−例として
2MI+2の超音波をjX信すると、ドプラタフ果によ
り生ずるドプラ信号の周1娼:1その運動速度に応して
異なるために、妊産41iiの動きによるドプラ信号は
0〜]011zに、また胎児の心拍動によるドプラ信号
4J: 10011 z以上に分布する。これに対し胎
動によるI−プライ菖号は2011z〜11011 z
に存在する。For example, if an ultrasound of 2 MI + 2 is transmitted from above the abdominal wall of a pregnant woman into the body, the Doppler signal generated by the Doppler tuff effect will vary depending on its speed of movement. The Doppler signal due to the movement of 41ii is distributed from 0 to ]011z, and the Doppler signal due to the fetal heartbeat is distributed over 4J:10011z. On the other hand, I-ply iris due to fetal movement is 2011z to 11011z
exists in
超音波のI:’、11波数は任意の周波数でよいが、周
波数に比例して]−プラ周波数は変化するため、ここで
4:I: 2 Ml+2の場合を例にして説明するが本
発明ではこの周波数に限定されス【いごと勿論である。The ultrasonic I:', 11 wave number may be any frequency, but since the pla frequency changes in proportion to the frequency, the case of 4:I: 2 Ml+2 will be explained here as an example, but the present invention Of course, it is limited to this frequency.
ずなわら胎動は心拍動に比べてゆるやかな運動であるた
め、両省の)・ブラ信号は上記のように信号周波数が異
なる・;i;域に分布する。また妊産婦の動きは安静に
している場合はきわめて遅い動きであるため、その信号
周波数は胎動によるドプラ周波数よりもさらに低いとこ
ろに分布する。そこで2M1lzの超音波では1゛プラ
信のうち20+1/、〜80肚をとりだすごとにより、
連続的に胎動の存在を知ることができる。また同時に1
00IIZ以上の心拍動成分をとりだし、心拍数計4(
1回路に入力することにより、胎児の心拍数を知るごと
もできる。Since the fetal movement is a slower movement than the heartbeat, the ) and bra signals of both provinces are distributed in the range of different signal frequencies as described above. Furthermore, since the pregnant woman moves very slowly when she is at rest, the signal frequency is distributed even lower than the Doppler frequency due to fetal movement. Therefore, with 2M1lz ultrasound, by extracting 20+1/~80 degrees out of 1 degree,
The presence of fetal movements can be detected continuously. Also at the same time 1
Extract the heartbeat component of 00IIZ or higher and measure it with heart rate meter 4 (
By inputting it into one circuit, it is also possible to know the heart rate of the fetus.
胎Jリノによる周波数2011z〜8011zのドプラ
信号は、フィルり通過(&4灸波され、さらにFi′i
、流j曽中畠器で1曽幅され記録計により記lメされる
。The Doppler signal of frequency 2011z to 8011z by Fi'i
, the width of the stream was measured by So Nakabata ware and recorded by a recorder.
胎動の存在を知るためには記録計乙こよらずCIITに
よる表示、信号に同期した音や光の発生などを利用する
こともでき、またこれらを記録計と併用することもでき
るが、記録計により記録紙に記録することは簡便さと記
録の保存ということがら一般的に便利であると考えられ
る。In order to know the presence of fetal movements, it is possible to use the display by CIIT, the generation of sound or light synchronized with the signal, etc., and these can also be used in conjunction with a recorder. It is generally considered convenient to record on recording paper because of the simplicity and preservation of records.
胎動があるとその記録は記録紙」二で大抵はパルス状に
書かれ、このパルスの振幅は胎動の大きさに比例する。When there is a fetal movement, the record is usually written on a recording paper in the form of a pulse, and the amplitude of this pulse is proportional to the size of the fetal movement.
また二チャンネル記録計を用いて胎児の心拍数を同時に
紙上に記録することにより、相互の関連を検査すること
もできる。Furthermore, by simultaneously recording the fetal heart rate on paper using a two-channel recorder, it is also possible to examine the mutual relationship.
本発明に係る胎動検出装置では、上述のように妊産婦の
腹壁上から超音波を送(r’r Lドプラ信号を受信す
るごとにより、連続的にまた客観的にしかも簡便に胎動
を検出でき、更に同じドプラ信号から胎児の心拍動を検
出して同時記録し両者の関連を67C認することもでき
るといった諸効果がある。In the fetal movement detection device according to the present invention, as described above, fetal movements can be detected continuously, objectively, and simply by transmitting ultrasonic waves from above the abdominal wall of a pregnant woman (receiving r'r L Doppler signals). Furthermore, there are various effects such as being able to detect and simultaneously record the heartbeat of the fetus from the same Doppler signal and confirming the relationship between the two.
第1図は本発明に係る胎動検出装置のブロック図、第2
図は本発明のその他の実施例を示すブロック図である。
1・・超音波振動子、2・・超音波送信回路、3・・超
音波受信回路、4・・ドプラ検出回路、5・・胎動信号
用フィルタ、6・・胎動信号検波回路、7・・胎動信号
増幅回路、8・・記録計、9・・心拍動信号用フィルタ
、10・・心。
拍動信号検波回路、11・・心拍数計測回路、12・・
二チャンネル記録針。FIG. 1 is a block diagram of a fetal movement detection device according to the present invention, and FIG.
The figure is a block diagram showing another embodiment of the present invention. 1. Ultrasonic transducer, 2. Ultrasonic transmitter circuit, 3. Ultrasonic receiver circuit, 4. Doppler detection circuit, 5. Fetal movement signal filter, 6. Fetal movement signal detection circuit, 7. Fetal movement signal amplification circuit, 8. Recorder, 9. Heartbeat signal filter, 10. Heart. Pulsation signal detection circuit, 11... Heart rate measurement circuit, 12...
Two-channel recording needle.
Claims (4)
該送信手段によって妊婦の体表から入射され妊婦の体内
において反射された超音波を受信超音波として受信する
とともに該受イ、″7超音波に応した信号を受信信号と
して出力する受(M手段と、胎児の心拍動、胎動、妊婦
の腹壁や内臓の動きなどによって1−′プラ効果(周波
数変移)を受けた前記受信超音波による前記受信信号を
入力とし前記胎動による信号成分を胎動信号として選択
的に抽出するための抽出手段とを備えたごとを特徴とす
る胎動検出装置。(1) A transmitting means for injecting ultrasound waves from the body surface of a pregnant woman;
A receiver (M means) for receiving ultrasonic waves incident from the body surface of the pregnant woman and reflected in the pregnant woman's body by the transmitting means as received ultrasonic waves, and outputting a signal corresponding to the ultrasonic waves as a received signal. Then, the received signal from the received ultrasonic wave that has undergone a 1-' plas effect (frequency shift) due to fetal heartbeat, fetal movement, movement of the pregnant woman's abdominal wall and internal organs, etc. is input, and the signal component due to the fetal movement is used as a fetal movement signal. A fetal movement detection device characterized by comprising: extraction means for selective extraction.
えたことを特徴とする特5′目?j求の範囲第1項記載
の胎動検出装置。(2) Item 5', characterized in that it includes a recording means for recording the fetal movement signal on recording paper. j) The fetal movement detection device according to item 1.
る前記受信信号を入力とし前記胎児の心拍動による信号
成分を胎児心拍動信号として選択的に抽出するための胎
児心拍動信号抽出手段を備えたことを特徴とする特許請
求の範囲第1項記載の胎動検出装置。(3) Fetal heartbeat signal extraction means for inputting the received signal from the received ultrasonic wave subjected to the Doppler effect b) and selectively extracting a signal component due to the fetal heartbeat as a fetal heartbeat signal. The fetal movement detection device according to claim 1, further comprising: a fetal movement detection device;
号と共通の時間軸をもちいて記録する手段を備えたこと
を特徴とする特許請求の範囲第1項、第2項又は第3項
記載の胎動検出装置。(4) Claims 1, 2, or 3, characterized in that the recorder is equipped with means for recording fetal heart (automatic signals) using a common time axis with the fetal movement signals. Fetal movement detection device described in Section 1.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3200284A JPS60176630A (en) | 1984-02-22 | 1984-02-22 | Fetal movement detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3200284A JPS60176630A (en) | 1984-02-22 | 1984-02-22 | Fetal movement detector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS60176630A true JPS60176630A (en) | 1985-09-10 |
Family
ID=12346687
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3200284A Pending JPS60176630A (en) | 1984-02-22 | 1984-02-22 | Fetal movement detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60176630A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54105875A (en) * | 1978-02-07 | 1979-08-20 | Masanobu Inagaki | Fetal pulse rate meter |
JPS5894841A (en) * | 1981-11-20 | 1983-06-06 | ユニヴェルシテ・ド・フランシューコムテ | Method and apparatus for recording quickening |
-
1984
- 1984-02-22 JP JP3200284A patent/JPS60176630A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54105875A (en) * | 1978-02-07 | 1979-08-20 | Masanobu Inagaki | Fetal pulse rate meter |
JPS5894841A (en) * | 1981-11-20 | 1983-06-06 | ユニヴェルシテ・ド・フランシューコムテ | Method and apparatus for recording quickening |
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