JPS639459B2 - - Google Patents
Info
- Publication number
- JPS639459B2 JPS639459B2 JP57121091A JP12109182A JPS639459B2 JP S639459 B2 JPS639459 B2 JP S639459B2 JP 57121091 A JP57121091 A JP 57121091A JP 12109182 A JP12109182 A JP 12109182A JP S639459 B2 JPS639459 B2 JP S639459B2
- Authority
- JP
- Japan
- Prior art keywords
- acoustic
- heart rate
- fetal
- fetus
- measuring device
- 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.)
- Expired
Links
- 210000002458 fetal heart Anatomy 0.000 claims description 28
- 230000005236 sound signal Effects 0.000 claims description 23
- 210000003754 fetus Anatomy 0.000 claims description 19
- 230000000638 stimulation Effects 0.000 claims description 17
- 230000004044 response Effects 0.000 claims description 14
- 230000002441 reversible effect Effects 0.000 claims description 12
- 230000001605 fetal effect Effects 0.000 claims description 11
- 210000003815 abdominal wall Anatomy 0.000 claims description 7
- 230000008774 maternal effect Effects 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims 1
- 230000005284 excitation Effects 0.000 description 21
- 229920000642 polymer Polymers 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 230000036541 health Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 4
- 230000005856 abnormality Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 206010003497 Asphyxia Diseases 0.000 description 1
- 208000032943 Fetal Distress Diseases 0.000 description 1
- 206010016855 Foetal distress syndrome Diseases 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009532 heart rate measurement Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Description
【発明の詳細な説明】
本発明は、胎児に母体の腹壁を通して音響刺戟
を与えたときの胎児の心音反応を計測する胎児音
響刺戟反応計測装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fetal acoustic stimulation response measuring device that measures the fetal heart sound response when acoustic stimulation is applied to the fetus through the abdominal wall of the mother's body.
分娩時の胎児の心拍変化パターンが、胎児の健
康についての情報を含んでいることが知られてい
る。例えば、臨床現場では、胎児仮死の診断には
胎児の心拍数が用いられている。 It is known that the fetal heart rate change pattern during delivery contains information about the health of the fetus. For example, in clinical practice, fetal heart rate is used to diagnose fetal distress.
従来、胎児の心音の計測は、単に母体の腹壁に
圧電素子等よりなる音響変換器を接触させ、胎児
の心音を採取して電気信号に変換し、これを処理
して心拍数を測る等のことが行われていた。 Conventionally, fetal heart sounds have been measured by simply placing an acoustic transducer made of a piezoelectric element in contact with the mother's abdominal wall, collecting the fetal heart sounds, converting them into electrical signals, and processing this to measure the heart rate. things were being done.
しかしながら、このような受動的な方法だけで
は、胎児の健康状態の正確な診断ができない欠点
があつた。 However, this passive method alone has the drawback that it is not possible to accurately diagnose the health condition of the fetus.
本発明の目的は、胎児に外部から音響刺戟を与
えてその反応により積極的に胎児の健康状態の診
断を行える胎児音響刺戟反応計測装置を提供する
にある。 SUMMARY OF THE INVENTION An object of the present invention is to provide a fetal acoustic stimulus response measuring device that can positively diagnose the health condition of a fetus by externally applying acoustic stimulus to the fetus and based on the reaction.
本発明に係る胎児音響刺戟反応計測装置は、母
体の腹壁に載置されて胎児に音響刺戟を与える機
能と胎児の心音を採取して心音信号に変換する機
能とをもつ圧電式可逆音響変換器と、該圧電式可
逆音響変換器を間欠的に励振させて音響振動を発
生させる音響励振装置と、前記圧電式可逆音響変
換器が採取した心音信号を処理して胎児の心拍数
を計測する心拍数計測装置とを有することを特徴
とするものである。 The fetal acoustic stimulation response measuring device according to the present invention is a piezoelectric reversible acoustic transducer that is placed on the maternal abdominal wall and has the function of applying acoustic stimulation to the fetus and the function of collecting fetal heart sounds and converting them into heart sound signals. an acoustic excitation device that intermittently excites the piezoelectric reversible acoustic transducer to generate acoustic vibrations; and a heartbeat that processes the heart sound signal collected by the piezoelectric reversible acoustic transducer to measure the heart rate of the fetus. It is characterized by having a number measuring device.
以下本発明の実施例を図面を参照して詳細に説
明する。 Embodiments of the present invention will be described in detail below with reference to the drawings.
第１図は本発明に係る胎児音響刺戟反応計測装
置の第１実施例を示したものである。この装置
は、圧電式可逆音響変換器１を有する。この変換
器１は、母体の腹壁に設置されて胎児に音響刺戟
を与える機能と、前記胎児の心音を採取して心音
信号に変換する機能との２つの機能をもつてい
る。変換器１の入出力端子２には、切換スイツチ
３を介して音響励振装置４と、心拍数計測装置５
とが切換え接続されるようになつている。音響励
振装置４は、所要の周波数で発振をして励振信号
発生する発振部６と、この発振部６からの励振信
号を電力増幅して変換器１に与える電力増幅部７
とから成つている。心拍数計測装置５は、変換器
１から得られる心音信号を増幅する前置増幅部８
と、増幅された心音信号から母体心音信号等を除
去して胎児心音信号を取り出しこれを波形整形し
てパルス状の心泊信号として出力する波形処理部
９と、波形処理部９から得られるパルス状の胎児
心拍信号を計数して胎児の心拍数を測出する心拍
数計数部１０と、得られた胎児の心拍数を表示す
る心拍数表示部１１とから成つている。切換スイ
ツチ３には、切換駆動装置１２が接続されてい
る。この切換駆動装置１２は、切換周期を定める
タイマー１３と、このタイマー１３で定められた
間隔で切換スイツチ３を自動的に切換えるスイツ
チ自動切換駆動部１４と、スイツチ３の自動切換
えと手動切換えとを切換える手動自動切換選択部
１５とから成つている。手動自動切換選択部１５
は、自動端子１５Ａと手動端子部１５Ｂとを備
え、切換操作子１５Ｃを自動端子１５Ａに接続し
ておくことにより自動切換えができるようになつ
ている。 FIG. 1 shows a first embodiment of the fetal acoustic stimulation response measuring device according to the present invention. This device has a piezoelectric reversible acoustic transducer 1. This converter 1 has two functions: one is installed on the abdominal wall of the mother's body and provides acoustic stimulation to the fetus, and the other is to collect the fetal heart sounds and convert them into heart sound signals. An acoustic excitation device 4 and a heart rate measuring device 5 are connected to the input/output terminal 2 of the converter 1 via a changeover switch 3.
and are switched and connected. The acoustic excitation device 4 includes an oscillation section 6 that oscillates at a required frequency to generate an excitation signal, and a power amplification section 7 that amplifies the power of the excitation signal from the oscillation section 6 and supplies it to the converter 1.
It consists of. The heart rate measuring device 5 includes a preamplifier 8 that amplifies the heart sound signal obtained from the converter 1.
A waveform processing section 9 removes the maternal heart sound signal etc. from the amplified heart sound signal to extract the fetal heart sound signal, shapes the waveform of this signal, and outputs it as a pulsed heart signal, and a pulse obtained from the waveform processing section 9. It consists of a heart rate counting section 10 that measures fetal heart rate by counting fetal heart rate signals, and a heart rate display section 11 that displays the obtained fetal heart rate. A switching drive device 12 is connected to the switching switch 3 . This switching drive device 12 includes a timer 13 that determines the switching cycle, a switch automatic switching drive unit 14 that automatically switches the switching switch 3 at intervals determined by the timer 13, and a switch 3 that automatically switches and manually switches the switch 3. and a manual/automatic switching selection section 15 for switching. Manual automatic switching selection section 15
is equipped with an automatic terminal 15A and a manual terminal section 15B, and can perform automatic switching by connecting a switching operator 15C to the automatic terminal 15A.
第２図及び第３図は圧電式可逆音響変換器１の
具体例を示したものである。この変換器１は、シ
リコンゴム等の柔軟性に富むほぼ非圧縮性の材料
よりなる圧力伝達体１６を有する。この圧力伝達
体１６は、片側に滑らかな凸表面１６Ａを有し、
その反対側に平坦な被検体接触面１６Ｂを有する
中実形の断面かまぼこ状をなしている。この圧力
伝達体１６の凸表面１６Ａ上には、音響電気可逆
変換素子として高分子圧電フイルム１７が一様に
密着して張設されている。高分子圧電フイルム１
７としては、圧電定数の大きいポリフツ化ビニリ
デン等が好ましい。高分子圧電フイルム１７の表
裏両面には図示しないが薄い電極膜がそれぞれ設
けられている。このような高分子圧電フイルム１
７は、圧力伝達体１６の凸表面１６Ａ上に密着し
たまま緊張した状態となつているように、その周
辺の全部又は一部が金属などの剛体よりなる２個
の剛体枠１８，１９で緊張状態に保持され、効率
よく圧電変換が行えるようになつている。これら
剛体枠１８，１９は高分子圧電フイルム１７の表
裏両面にそれぞれ電気的に接続され、且つこれら
剛体枠１８，１９が入出力端子２を兼ねるように
なつている。剛体枠１８，１９は導線２０を介し
て前述した切換スイツチ３に接続されるようにな
つている。圧力伝達体１６とは反対側において高
分子圧電フイルム１７を保護するために保護カバ
ー２１が配設され、剛体枠１８に取付材２２を介
して周縁部が固定されている。保護カバー２１に
は複数の通気孔２３が設けられている。 2 and 3 show a specific example of the piezoelectric reversible acoustic transducer 1. FIG. The transducer 1 has a pressure transmitting body 16 made of a flexible and substantially incompressible material such as silicone rubber. This pressure transmitting body 16 has a smooth convex surface 16A on one side,
It has a solid semi-cylindrical cross section with a flat subject contacting surface 16B on the opposite side. On the convex surface 16A of the pressure transmitting body 16, a polymeric piezoelectric film 17 is stretched uniformly and tightly as an acoustoelectric reversible transducer. Polymer piezoelectric film 1
7 is preferably polyvinylidene fluoride or the like, which has a large piezoelectric constant. Although not shown, thin electrode films are provided on both the front and back surfaces of the polymer piezoelectric film 17, respectively. Such polymer piezoelectric film 1
7 is tensioned by two rigid frames 18 and 19, the whole or part of which is made of a rigid body such as metal, so that the pressure transmitting body 16 remains in a tensioned state while being in close contact with the convex surface 16A. This state allows efficient piezoelectric conversion. These rigid frames 18 and 19 are electrically connected to both the front and back surfaces of the polymer piezoelectric film 17, respectively, and these rigid frames 18 and 19 also serve as input/output terminals 2. The rigid frames 18 and 19 are connected to the aforementioned changeover switch 3 via a conductive wire 20. A protective cover 21 is provided to protect the polymer piezoelectric film 17 on the side opposite to the pressure transmitting body 16, and its peripheral portion is fixed to the rigid frame 18 via a mounting member 22. The protective cover 21 is provided with a plurality of ventilation holes 23.
次に、第１図乃至第３図に示す如き胎児音響刺
戟反応計測装置による胎児心拍数の測定の仕方に
ついて説明する。第２図及び第３図に示す如き圧
電式可逆音響変換器１は、圧力伝達体１６の被検
体接触面１６Ｂを母体の腹壁に接触させてばんそ
うこう等で腹壁に固定する。かかる状態で切換ス
イツチ３を切換駆動装置１２の操作で間欠的に音
響励振装置４側に切換えて変換器１を第４図Ａに
示すように間欠的に励振する。変換器１は励振信
号の電圧が高分子圧電フイルム１７の両面の電極
間に印加されると、励振信号の周波数で振動し、
音響信号が発生し、これが圧力伝達体１６を介し
て母体に伝えられ母体内の胎児を音響的に刺戟す
る。所定時間の間音響刺戟が与えられると、切換
スイツチ３の作用で変換器１が心拍数計測装置５
側に切換わり、胎児の心音が変換器１で受信され
て高分子圧電フイルム１７により第４図Ｂに示す
ような心音信号Ｓに変換される。この心音信号Ｓ
の中には、胎児心音信号S1と、S1以外の母体信音
信号などのノイズS2とが共に含まれている。心音
信号Ｓは前置増幅部８で増幅された後、波形処理
部９に入力されて母体心音信号などのノイズS2が
フイルター等の作用で除去され、第４図Ｃに示す
ように胎児心音信号S1が取り出され、これが波形
整形されてパルス状の心拍信号として心拍数計数
部１０に入力され、胎児の心拍数の計数が行わ
れ、心拍数表示部１１に第４図Ｄ，Ｅに示すよう
に胎児心拍数が表示される。この場合、胎児が正
常であれば音響刺戟を与えた直後に胎児心拍数の
増加の山が第４図Ｄに図示のように観測される。
胎児に異常があれば第４図Ｅに示すように胎児心
拍数の増加の山が観測されない。 Next, a method of measuring the fetal heart rate using the fetal acoustic stimulus response measuring device as shown in FIGS. 1 to 3 will be explained. The piezoelectric reversible acoustic transducer 1 as shown in FIGS. 2 and 3 is fixed to the abdominal wall with a bandage or the like with the subject contacting surface 16B of the pressure transmitting body 16 in contact with the abdominal wall of the mother's body. In this state, the changeover switch 3 is intermittently switched to the acoustic excitation device 4 side by operating the changeover drive device 12, and the transducer 1 is intermittently excited as shown in FIG. 4A. When the voltage of the excitation signal is applied between the electrodes on both sides of the polymer piezoelectric film 17, the transducer 1 vibrates at the frequency of the excitation signal,
An acoustic signal is generated which is transmitted to the mother's body via the pressure transmitter 16 to acoustically stimulate the fetus within the mother's body. When acoustic stimulation is applied for a predetermined period of time, the changeover switch 3 causes the transducer 1 to switch to the heart rate measuring device 5.
The fetal heart sounds are received by the transducer 1 and converted by the polymer piezoelectric film 17 into a heart sound signal S as shown in FIG. 4B. This heart sound signal S
This includes both the fetal heart sound signal S 1 and noise S 2 such as a maternal sound signal other than S 1 . After the heart sound signal S is amplified by the preamplifier 8, it is input to the waveform processing unit 9, where noise S2 such as the maternal heart sound signal is removed by a filter or the like, and the fetal heart sound is converted into the fetal heart sound as shown in FIG. 4C. The signal S1 is taken out, shaped into a waveform, and input as a pulsed heartbeat signal to the heart rate counting section 10, where the fetal heart rate is counted, and the heart rate display section 11 displays the signals shown in FIGS. 4D and E. The fetal heart rate is displayed as shown. In this case, if the fetus is normal, a peak in the fetal heart rate will be observed immediately after the acoustic stimulation is applied, as shown in FIG. 4D.
If there is an abnormality in the fetus, no peak of increase in fetal heart rate will be observed as shown in Figure 4E.
本実施例の胎児音響刺戟反応計測装置は、切換
スイツチ３を心拍数計測装置５側に接続しておく
と、通常の心拍数計測装置と同様に使用すること
ができる。 The fetal acoustic stimulus response measuring device of this embodiment can be used in the same manner as a normal heart rate measuring device by connecting the changeover switch 3 to the heart rate measuring device 5 side.
第５図は本発明に係る胎児音響刺戟反応計測装
置の第２実施例を示したものである。本実施例に
おいては、圧電式可逆音響変換器１として、高分
子圧電フイルム１７の表裏両面にそれぞれ励振用
電極２４と受信用電極２５とを共にもち、これが
図示のようにそれぞれ櫛歯状をなしていて相互に
噛み合うパターンに形成されている。その他の凸
形の圧力伝達体を有する点、剛体枠で圧電フイル
ム１７に張力がかけられている点等は第３図と同
様の構造になつている。ただし、この場合には剛
体枠１８，１９は各電極２４，２５に絶縁して取
付け、励振用電極２４は音響励振装置４側に接続
され、受信用電極２５は心拍数計測装置２８側に
接続されている。このような２種類の電極２４，
２５をもつ変換器１は、各側が音響的には強く結
合し、電気的には結合しないことが必要である。
なお、２６は両電極間に設けたシールドラインで
ある。 FIG. 5 shows a second embodiment of the fetal acoustic stimulus response measuring device according to the present invention. In this embodiment, the piezoelectric reversible acoustic transducer 1 has an excitation electrode 24 and a reception electrode 25 on both the front and back surfaces of a polymeric piezoelectric film 17, each having a comb-like shape as shown in the figure. They are formed in an interlocking pattern. The structure is similar to that shown in FIG. 3 except that it has a convex pressure transmitting body and that tension is applied to the piezoelectric film 17 by a rigid frame. However, in this case, the rigid frames 18 and 19 are attached to each electrode 24 and 25 insulated, the excitation electrode 24 is connected to the acoustic excitation device 4 side, and the reception electrode 25 is connected to the heart rate measurement device 28 side. has been done. These two types of electrodes 24,
The transducer 1 with 25 requires strong acoustic coupling on each side, but no electrical coupling.
Note that 26 is a shield line provided between both electrodes.
また、本実施例では心拍数計測装置２８は切換
スイツチ３を介さずに直接受信用電極２５に接続
している。 Further, in this embodiment, the heart rate measuring device 28 is directly connected to the receiving electrode 25 without using the changeover switch 3.
更に、本実施例では、心拍数計測装置２８内の
前置増幅部８と波形処理部９との間に励振波分離
フイルタ２７を接続し、受信された心音信号の中
から励振波成分を除去するようにしている。 Furthermore, in this embodiment, an excitation wave separation filter 27 is connected between the preamplifier section 8 and the waveform processing section 9 in the heart rate measuring device 28 to remove excitation wave components from the received heart sound signal. I try to do that.
次に、第５図に示す如き胎児音響刺戟反応計測
装置による胎児心拍数の測定の仕方について説明
する。切換操作子１５Ｃを自動端子１５Ａに接続
しておくと、切換駆動装置１２が切換スイツチ３
を間欠的に音響励振装置４側に接続して変換器１
をその励振用電極２４を利用して第６図Ａに示す
ように間欠的に励振し、高分子圧電フイルム１７
を励振周波数で振動させ、音響信号を発生させ圧
力伝達体を介して母体内の胎児に音響刺戟を間欠
的に与える。変換器１においては、第６図Ｂに示
すように音響刺戟と共に胎児の心音信号S1及び母
体心音信号などのノイズS2が受信される。このよ
うな心音信号Ｓは心拍数計数装置２８側に印加さ
れ、前置増幅器８で増幅された後、励振波分離フ
イルタ２７で励振波成分が除去され、次に波形処
理部９で母体心音信号S2が除去されて第６図Ｃに
示すような胎児心音信号S1が取り出され、波形整
形されてパルス状の心拍信号として心拍数計数部
１０に入力され、胎児心拍数の計数が行われ、心
拍数表示部１１に第４図Ｄ，Ｅに示すように胎児
心拍数が表示される。この場合、胎児が正であれ
ば前述したように音響刺戟を与えた直後に胎児心
拍数の増加の山が図示のように観測され、胎児に
異常があれば胎児心拍数の増加の山は観測されな
い。 Next, a method of measuring the fetal heart rate using the fetal acoustic stimulation response measuring device as shown in FIG. 5 will be explained. When the switching operator 15C is connected to the automatic terminal 15A, the switching drive device 12 operates the switching switch 3.
is intermittently connected to the acoustic excitation device 4 side and the transducer 1
is intermittently excited using the excitation electrode 24 as shown in FIG. 6A, and the polymer piezoelectric film 17
The device vibrates at an excitation frequency to generate an acoustic signal, which intermittently applies acoustic stimulation to the fetus inside the mother's body via a pressure transmitter. In the transducer 1, as shown in FIG. 6B, noise S2 such as a fetal heart sound signal S1 and a maternal heart sound signal is received together with acoustic stimulation. Such a heart sound signal S is applied to the heart rate counter 28 side, amplified by the preamplifier 8, the excitation wave component is removed by the excitation wave separation filter 27, and then the maternal heart sound signal is processed by the waveform processing unit 9. S2 is removed, and the fetal heart sound signal S1 as shown in FIG. , the fetal heart rate is displayed on the heart rate display section 11 as shown in FIGS. 4D and 4E. In this case, if the fetus is positive, a peak of increase in fetal heart rate will be observed immediately after applying acoustic stimulation as described above, and if there is an abnormality in the fetus, a peak of increase in fetal heart rate will be observed. Not done.
なお、第２実施例において、手動励振が不要で
あるならば、発振部６で間欠的に発振させるよう
にすると、切換駆動装置１２とスイツチ３とを省
略することができる。 In the second embodiment, if manual excitation is not necessary, the switching drive device 12 and the switch 3 can be omitted by causing the oscillation section 6 to oscillate intermittently.
以上説明したように本発明に係る胎児音響刺戟
反応計測装置によれば、胎児に外部から音響刺戟
を与え、胎児の反応信号を受信して胎児心拍数の
測定を行うので、仮死状態にあるのか否か等の判
断もつき、胎児の健康状態の正確な診断を行うこ
とができる。 As explained above, according to the fetal acoustic stimulation response measuring device according to the present invention, acoustic stimulation is applied to the fetus from the outside, and the fetal heart rate is measured by receiving the fetal response signal, so whether the fetus is in a state of asphyxia or not. It is also possible to determine whether or not the baby is pregnant, and to accurately diagnose the health condition of the fetus.
第１図は本発明に係る計測装置の第１実施例の
ブロツク図、第２図は第１実施例で用いる変換器
の一例を示す平面図、第３図は第２図のＸ−
X′線断面図、第４図Ａ〜Ｅは第１実施例の場合
の音響刺戟と反応心音信号の関係を示す波形図、
第５図は本発明に係る計測装置の第２実施例のブ
ロツク図、第６図Ａ〜Ｄは第２実施例の場合の音
響刺戟と反応心音信号の関係を示す波形図であ
る。
１……圧電式可逆音響変換器、３……切換スイ
ツチ、４……音響励振装置、５，２８……心拍数
計測装置、６……発振部、７……電力増幅部、８
……前置増幅部、９……波形処理部、１０……心
拍数計数部、１１……心拍数表示部、１２……切
換駆動装置、１６……圧力伝達体、１７……高分
子圧電フイルム、２４……励振用電極、２５……
受信用電極。
FIG. 1 is a block diagram of a first embodiment of a measuring device according to the present invention, FIG. 2 is a plan view showing an example of a converter used in the first embodiment, and FIG.
4A to 4E are waveform diagrams showing the relationship between acoustic stimulation and response heart sound signals in the case of the first embodiment;
FIG. 5 is a block diagram of a second embodiment of the measuring device according to the present invention, and FIGS. 6A to 6D are waveform diagrams showing the relationship between acoustic stimulation and response heart sound signals in the second embodiment. DESCRIPTION OF SYMBOLS 1... Piezoelectric reversible acoustic transducer, 3... Changeover switch, 4... Acoustic excitation device, 5, 28... Heart rate measuring device, 6... Oscillation section, 7... Power amplifier section, 8
... Preamplifier section, 9 ... Waveform processing section, 10 ... Heart rate counting section, 11 ... Heart rate display section, 12 ... Switching drive device, 16 ... Pressure transmission body, 17 ... Polymer piezoelectric Film, 24... Excitation electrode, 25...
Receiving electrode.
Claims (1)
える機能と胎児の心音を採取して心音信号に変換
する機能とをもつ圧電式可逆音響変換器と、該圧
電式可逆音響変換器を間欠的に励振させて音響振
動を発生させる音響励振装置と、前記圧電式可逆
音響変換器が採取した心音信号を処理して胎児の
心拍数を計測する心拍数計測装置とを有すること
を特徴とする胎児音響刺戟反応計測装置。1. A piezoelectric reversible acoustic transducer that is placed on the maternal abdominal wall and has the function of providing acoustic stimulation to the fetus and the function of collecting fetal heart sounds and converting them into heart sound signals, and the piezoelectric reversible acoustic transducer is intermittently operated. and a heart rate measuring device that measures the heart rate of the fetus by processing heart sound signals collected by the piezoelectric reversible acoustic transducer. Fetal acoustic stimulus response measurement device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12109182A JPS5911836A (en) | 1982-07-12 | 1982-07-12 | Apparatus for measuring reaction of acoustic stimulation of fetus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12109182A JPS5911836A (en) | 1982-07-12 | 1982-07-12 | Apparatus for measuring reaction of acoustic stimulation of fetus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5911836A JPS5911836A (en) | 1984-01-21 |
| JPS639459B2 true JPS639459B2 (en) | 1988-02-29 |
Family
ID=14802646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12109182A Granted JPS5911836A (en) | 1982-07-12 | 1982-07-12 | Apparatus for measuring reaction of acoustic stimulation of fetus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5911836A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS538145A (en) * | 1976-07-01 | 1978-01-25 | Xerox Corp | Document handling device |
| JPS5324757A (en) * | 1976-08-20 | 1978-03-07 | Hitachi Ltd | Subtraction circuit |
-
1982
- 1982-07-12 JP JP12109182A patent/JPS5911836A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS538145A (en) * | 1976-07-01 | 1978-01-25 | Xerox Corp | Document handling device |
| JPS5324757A (en) * | 1976-08-20 | 1978-03-07 | Hitachi Ltd | Subtraction circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5911836A (en) | 1984-01-21 |
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