JPH0651031B2 - Electronic blood pressure monitor - Google Patents
Electronic blood pressure monitorInfo
- Publication number
- JPH0651031B2 JPH0651031B2 JP60033303A JP3330385A JPH0651031B2 JP H0651031 B2 JPH0651031 B2 JP H0651031B2 JP 60033303 A JP60033303 A JP 60033303A JP 3330385 A JP3330385 A JP 3330385A JP H0651031 B2 JPH0651031 B2 JP H0651031B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- signal
- low
- amplifier
- electronic sphygmomanometer
- 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 - Fee Related
Links
Landscapes
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は電子血圧計に関するものである。TECHNICAL FIELD The present invention relates to an electronic sphygmomanometer.
従来の技術 聴診法に基づく電子血圧計は、第４図の様な構成になっ
ている。まずその測定原理を説明する。腕帯１を腕に巻
き、ゴム球２で加圧して止血する。圧力を圧力検出回路
３で、またコロトコフ音を腕帯１に固定されたマイク４
とコロトコフ音検出回路５とで各々観測しながら、腕帯
１内の空気を徐々に排気して行く。そしてコロトコフ音
を検出し始めた時点の圧力が最高血圧、またコロトコフ
音を最後に検出した圧力が最低血圧であり、この決定は
信号処理部６でなされ、表示部７に表示される。８はゴ
ム管である。2. Description of the Related Art An electronic blood pressure monitor based on the auscultation method has a structure as shown in FIG. First, the measurement principle will be described. The arm band 1 is wrapped around the arm, and the rubber ball 2 is pressed to stop the bleeding. The pressure is detected by the pressure detection circuit 3, and the Korotkoff sound is fixed to the armband 1 by the microphone 4
The air in the armband 1 is gradually exhausted while observing each of them with the Korotkoff sound detection circuit 5. The pressure at the time when the Korotkoff sound is detected is the systolic blood pressure, and the pressure at which the Korotkoff sound is finally detected is the diastolic blood pressure. This determination is made by the signal processing unit 6 and displayed on the display unit 7. 8 is a rubber tube.
ところで従来は、上記圧力検出回路３を第５図の様に構
成していた。つまり、半導体圧力センサ９の圧力信号を
増幅器10により増幅し、Ａ／Ｄ変換器11によりＡ／Ｄ変
換する事により圧力検出を行なっていた。12は定電流回
路である。By the way, conventionally, the pressure detection circuit 3 has been constructed as shown in FIG. That is, the pressure signal of the semiconductor pressure sensor 9 is amplified by the amplifier 10 and A / D converted by the A / D converter 11 to detect the pressure. 12 is a constant current circuit.
発明が解決しようとする問題点 ゴム球２によって加圧を行う電子血圧計においては、ゴ
ム球２の圧縮時に圧力値が急峻に立ち上り、オーバーシ
ュートが起こる。従って圧力のアナログ値即ち第５図の
増幅器10の出力信号は、加圧時には第６図の様に変化す
る。そして加圧完了後に低速排気の測定状態に移行する
際に、圧力が数十mmHg急峻に立ち下がる。その為、加圧
の目標値より数十mmHg程低い圧力から測定が始まる事が
あった。また、加圧時も前記の圧力値のオーバーシュー
トにより圧力値が大きく変化し、加圧途中での圧力を読
み取りにくいという問題点があった。Problems to be Solved by the Invention In an electronic sphygmomanometer that pressurizes with the rubber ball 2, the pressure value rises sharply when the rubber ball 2 is compressed, and an overshoot occurs. Therefore, the analog value of the pressure, that is, the output signal of the amplifier 10 in FIG. 5 changes as shown in FIG. 6 during pressurization. After the pressurization is completed, the pressure drops sharply by several tens of mmHg when shifting to the low-speed exhaust measurement state. Therefore, the measurement may start from a pressure lower than the target value of pressurization by several tens of mmHg. Further, even during pressurization, the pressure value changes greatly due to the overshoot of the pressure value, which makes it difficult to read the pressure during pressurization.
本発明は上記問題点を解消するもので、加圧時の圧力の
急峻な変化の悪影響を打ち消すことのできる圧力検出回
路を備えた電子血圧計を提供することを目的とする。The present invention solves the above problems, and an object of the present invention is to provide an electronic sphygmomanometer equipped with a pressure detection circuit capable of canceling out the adverse effects of sharp changes in pressure during pressurization.
問題点を解決するための手段 上記問題点を解決するため、電子血圧計は、ゴム球によ
り加圧される止血用腕帯の圧力を検出する圧力センサ
と、この圧力センサの出力信号をデジタル信号に交換し
て信号処理部に供給するアナログ・デジタル変換器と、
前記圧力センサとアナログ・デジタル変換器との間に接
続され加圧時の圧力表示値の大きな変動を抑制するため
に、加圧時の急峻な圧力信号の変化を抑制するとともに
測定時の低速な圧力信号の変化を通過させるカットオフ
周波数を持つローパスフィルタと増幅器との直列回路と
を有する圧力検出回路を備えた構成としたものである。Means for Solving the Problems In order to solve the above problems, an electronic sphygmomanometer includes a pressure sensor for detecting the pressure of a hemostatic arm band that is pressurized by a rubber ball, and a digital output signal of the pressure sensor. An analog / digital converter that is exchanged for and supplied to the signal processing unit,
It is connected between the pressure sensor and the analog / digital converter to suppress a large fluctuation of the pressure display value at the time of pressurization, and suppresses a sharp change of the pressure signal at the time of pressurization and a low speed at the time of measurement. The configuration is provided with a pressure detection circuit having a series circuit of a low-pass filter having a cutoff frequency that allows changes in the pressure signal to pass and an amplifier.
作用 上記構成によれば、ローパスフィルタの効果によって、
加圧時の圧力のオーバーシュート分が圧力信号のアナロ
グ値に現れなくなるので、加圧完了直後から低速排気に
移行する時の圧力信号のアナログ値の急峻な立ち下がり
がなくなると同時に、加圧時の圧力の表示の変化幅も小
さくなる。Action According to the above configuration, the effect of the low-pass filter
Since the overshoot of the pressure during pressurization does not appear in the analog value of the pressure signal, there is no sharp fall of the analog value of the pressure signal when shifting to low-speed exhaust immediately after completion of pressurization, and at the same time during pressurization. The change range of the pressure display is also small.
実施例 以下本発明の実施例を第１図〜第３図に基づいて説明す
る。Embodiment An embodiment of the present invention will be described below with reference to FIGS.
第１図は本発明の第１の実施例における電子血圧計の圧
力検出回路の回路ブロック図で、21は定電流回路であ
り、半導体圧力センサ22に定電流を供給する。23はロー
パスフィルタであり、半導体圧力センサ22の出力信号を
入力信号とする。24は増幅器であり、ローパスフィルタ
23の出力信号を増幅する。25はＡ／Ｄ変換器であり、増
幅器24の出力信号をＡ／Ｄ変換する。26は信号処理部で
ある。FIG. 1 is a circuit block diagram of a pressure detection circuit of an electronic sphygmomanometer according to the first embodiment of the present invention, and 21 is a constant current circuit, which supplies a constant current to a semiconductor pressure sensor 22. Reference numeral 23 is a low-pass filter, which uses the output signal of the semiconductor pressure sensor 22 as an input signal. 24 is an amplifier, a low-pass filter
Amplifies the output signal of 23. Reference numeral 25 is an A / D converter, which A / D converts the output signal of the amplifier 24. 26 is a signal processing unit.
以下、上記構成における作用について説明する。ローパ
スフィルタ23の通過域は、従来例の第６図に示すように
ゴム球２による加圧時の圧力信号のオーバーシュート分
を平滑し、且つ血圧測定時の低速排気時の圧力変化に充
分追従するように設定されている。その結果、第２図に
示す様に、圧力信号のアナログ値、即ちＡ／Ｄ変換器25
への入力信号の加圧時のオーバーシュートは小さくな
る。そして、加圧中の圧力表示値の大きな変化や、加圧
完了後低速排気に移行する時の圧力表示値の急峻な立ち
下がりがなくなる。The operation of the above configuration will be described below. As shown in FIG. 6 of the conventional example, the pass band of the low-pass filter 23 smoothes the overshoot amount of the pressure signal at the time of pressurization by the rubber ball 2 and sufficiently follows the pressure change at the time of low-speed exhaust when measuring the blood pressure. Is set to. As a result, as shown in FIG. 2, the analog value of the pressure signal, that is, the A / D converter 25
The overshoot at the time of pressurization of the input signal to is small. Then, a large change in the pressure display value during pressurization and a sharp fall of the pressure display value at the time of shifting to low speed exhaust after completion of pressurization are eliminated.
第３図は本発明の第２の実施例における電子血圧計の圧
力検出回路の回路ブロック図で、第１の実施例との相違
点は、ローパスフィルタ23と増幅器24との接続位置を入
れ換えた点である。このような構成にしても第１の実施
例と同様な効果を得ることができる。なお、上記実施例
では、加圧手段として、ゴム球を説明したが、例えばポ
ンプなどの手段を使用した場合でも、上記と同様の効果
が得られる。また、圧力センサとして、半導体圧力セン
サを使用したが、例えば他の圧力センサを使用すること
もできる。FIG. 3 is a circuit block diagram of the pressure detection circuit of the electronic sphygmomanometer according to the second embodiment of the present invention. The difference from the first embodiment is that the connection positions of the low pass filter 23 and the amplifier 24 are exchanged. It is a point. Even with such a configuration, the same effect as that of the first embodiment can be obtained. In the above embodiment, the rubber ball was described as the pressurizing means, but the same effect as above can be obtained even when a means such as a pump is used. Further, although the semiconductor pressure sensor is used as the pressure sensor, for example, another pressure sensor may be used.
発明の効果 以上述べたごとく本発明によれば、加圧時の圧力表示値
の大きな変動、及び加圧完了後から低速排気に移行する
時の圧力表示値の急峻な立ち下がりを抑える事ができ、
その結果、加圧目標値までの加圧を確実に行なう事がで
きる。EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to suppress a large fluctuation of the pressure display value during pressurization and a sharp fall of the pressure display value when shifting to low speed exhaust after completion of pressurization. ,
As a result, it is possible to reliably perform the pressurization to the pressurization target value.
第１図は本発明の第１実施例における電子血圧計の圧力
検出回路の回路ブロック図、第２図は同圧力検出回路の
加圧時の圧力信号のアナログ値の変化の説明図、第３図
は本発明の第２の実施例における電子血圧計の圧力検出
回路の回路ブロック図、第４図は電子血圧計の構成図、
第５図は従来の電子血圧計の圧力検出回路の回路ブロッ
ク図、第６図は同圧力検出回路の加圧時の圧力信号のア
ナログ値の変化の説明図である。 １……腕帯、２……ゴム球、21……定電流回路、22……
半導体圧力センサ、23……ローパスフィルタ、24……増
幅器、25……Ａ／Ｄ変換器、26……信号処理部FIG. 1 is a circuit block diagram of a pressure detection circuit of an electronic sphygmomanometer according to the first embodiment of the present invention, FIG. 2 is an explanatory diagram of a change in analog value of a pressure signal at the time of pressurization of the pressure detection circuit, and FIG. FIG. 4 is a circuit block diagram of a pressure detection circuit of an electronic sphygmomanometer according to the second embodiment of the present invention, FIG. 4 is a configuration diagram of the electronic sphygmomanometer,
FIG. 5 is a circuit block diagram of a pressure detection circuit of a conventional electronic sphygmomanometer, and FIG. 6 is an explanatory diagram of changes in analog value of a pressure signal at the time of pressurization of the pressure detection circuit. 1 ... Armband, 2 ... Rubber ball, 21 ... Constant current circuit, 22 ...
Semiconductor pressure sensor, 23 ... Low pass filter, 24 ... Amplifier, 25 ... A / D converter, 26 ... Signal processing unit
Claims (3)
を検出する圧力センサと、この圧力センサの出力信号を
デジタル信号に交換して信号処理部に供給するアナログ
・デジタル変換器と、前記圧力センサとアナログ・デジ
タル変換器との間に接続され加圧時の圧力表示値の大き
な変動を抑制するために、加圧時の急峻な圧力信号の変
化を抑制するとともに測定時の低速な圧力信号の変化を
通過させるカットオフ周波数を持つローパスフィルタと
増幅器との直列回路とを有する圧力検出回路を備えた電
子血圧計。1. A pressure sensor for detecting the pressure of a haemostatic arm band pressed by a rubber ball, and an analog / digital converter for exchanging an output signal of the pressure sensor into a digital signal and supplying the digital signal to a signal processing section. , Which is connected between the pressure sensor and the analog / digital converter, suppresses a sharp change in the pressure signal during pressurization in order to suppress large fluctuations in the pressure display value during pressurization, and reduces the speed during measurement. Electronic sphygmomanometer equipped with a pressure detection circuit having a series circuit of a low-pass filter having a cut-off frequency that allows a change in the pressure signal to pass and an amplifier.
された構成とした特許請求の範囲第１項記載の電子血圧
計。2. The electronic sphygmomanometer according to claim 1, wherein the low-pass filter is connected to the front stage of the amplifier.
された構成とした特許請求の範囲第１項記載の電子血圧
計。3. The electronic sphygmomanometer according to claim 1, wherein the low-pass filter is connected to a stage subsequent to the amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60033303A JPH0651031B2 (en) | 1985-02-21 | 1985-02-21 | Electronic blood pressure monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60033303A JPH0651031B2 (en) | 1985-02-21 | 1985-02-21 | Electronic blood pressure monitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61191339A JPS61191339A (en) | 1986-08-26 |
| JPH0651031B2 true JPH0651031B2 (en) | 1994-07-06 |
Family
ID=12382780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60033303A Expired - Fee Related JPH0651031B2 (en) | 1985-02-21 | 1985-02-21 | Electronic blood pressure monitor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0651031B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10333204A1 (en) * | 2003-07-22 | 2005-02-24 | Conti Temic Microelectronic Gmbh | Method and device for pressure measurement |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54119788A (en) * | 1978-03-08 | 1979-09-17 | Asahi Toransu Kk | Digital system electronic blood pressure meter |
| JPS5586442A (en) * | 1978-12-22 | 1980-06-30 | Ueda Electronic Works | Indirect yonometer |
| JPS5849136A (en) * | 1981-09-17 | 1983-03-23 | 東芝テック株式会社 | Blood pressure measuring apparatus |
| JPS5911703U (en) * | 1982-07-13 | 1984-01-25 | 日本精密測器株式会社 | digital display blood pressure monitor |
| JPS59131329A (en) * | 1983-01-17 | 1984-07-28 | コーリン電子株式会社 | Digital type automatic blood pressure measuring apparatus |
| JPS59119802U (en) * | 1983-01-31 | 1984-08-13 | 株式会社日本コ−リン | blood pressure measuring device |
| JPS59164037A (en) * | 1983-03-07 | 1984-09-17 | コーリン電子株式会社 | Pulse discriminating method and blood pressure measuring apparatus |
-
1985
- 1985-02-21 JP JP60033303A patent/JPH0651031B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61191339A (en) | 1986-08-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |