JPH0466575B2 - - Google Patents
Info
- Publication number
- JPH0466575B2 JPH0466575B2 JP62172629A JP17262987A JPH0466575B2 JP H0466575 B2 JPH0466575 B2 JP H0466575B2 JP 62172629 A JP62172629 A JP 62172629A JP 17262987 A JP17262987 A JP 17262987A JP H0466575 B2 JPH0466575 B2 JP H0466575B2
- Authority
- JP
- Japan
- Prior art keywords
- probe
- blood flow
- flow meter
- living body
- alternating current
- 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 - Lifetime
Links
- 239000000523 sample Substances 0.000 claims description 21
- 230000017531 blood circulation Effects 0.000 claims description 16
- 238000005259 measurement Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 8
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 6
- 238000013459 approach Methods 0.000 claims description 5
- 239000008280 blood Substances 0.000 claims 1
- 210000004369 blood Anatomy 0.000 claims 1
- 239000000284 extract Substances 0.000 claims 1
- 230000010354 integration Effects 0.000 claims 1
- 239000000835 fiber Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000003743 erythrocyte Anatomy 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
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、レーザー光を光フアイバを用いて人
体等の被測定部位に照射し、その散乱光を測定す
ることにより血流の状態を検知するための血流計
に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention detects the state of blood flow by irradiating laser light onto a part to be measured such as a human body using an optical fiber and measuring the scattered light. This relates to a blood flow meter for blood flow measurement.
［従来の技術］
従来、レーザー光を利用した血流計としては、
例えば特開昭60−203236号公報に記載された装置
が知られている。この従来装置は通常はプローブ
が人体に接触しているか否かを検知する手段を備
えていない。なお、散乱光の全体の信号の大きさ
を比較することによつて、プローブに物体が接触
していることを判断する機能を持つものもある。[Conventional technology] Conventionally, blood flow meters using laser light have
For example, a device described in Japanese Unexamined Patent Publication No. 60-203236 is known. This conventional device usually does not have a means for detecting whether or not the probe is in contact with the human body. Note that some devices have a function of determining whether an object is in contact with the probe by comparing the magnitude of the overall signal of scattered light.
しかしながら、これらの従来例ではプローブに
何も接触していなくとも、或いは動いている赤血
球等を持つ人体以外の静止物体に接触しても測定
をしてしまうことがある。 However, in these conventional examples, measurements may be made even if the probe is not in contact with anything or even if it is in contact with a stationary object other than a human body having moving red blood cells or the like.
［発明の目的］
本発明の目的は、上述の欠点を解消し、プロー
ブが確実に生体に接近したことを検知してから作
動するようにした血流計を提供することにある。[Object of the Invention] An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a blood flow meter that operates after reliably detecting that the probe approaches the living body.
［発明の概要］
上述の目的を達成するための本発明の要旨は、
レーザー光を第１の光結合手段を介してプローブ
に送出し、該プローブから照射されるレーザー光
の生体からの散乱光を第２の光結合手段を介して
光電検出器に導き、該光電検出器から出力される
信号を解析して血流状態を測定する血流計におい
て、前記第２の光結合手段を介した光を光電変換
することにより得られる電気信号の交流成分を取
出し、その大きさに基づいて前記プローブが生体
に接近したことを検知する検知手段と、該検知手
段の出力に基づいて前記測定を開始させる制御手
段とを有することを特徴とする血流計である。[Summary of the invention] The gist of the present invention for achieving the above object is as follows:
The laser beam is sent to the probe via the first optical coupling means, and the scattered light from the living body of the laser beam irradiated from the probe is guided to the photoelectric detector via the second optical coupling means, and the photoelectric detection is performed. In a blood flow meter that measures the state of blood flow by analyzing signals output from a device, the alternating current component of the electrical signal obtained by photoelectrically converting the light via the second optical coupling means is extracted, and its magnitude is measured. The blood flow meter is characterized in that it has a detection means for detecting that the probe approaches a living body based on the detection means, and a control means for starting the measurement based on the output of the detection means.
［発明の実施例］
本発明を図示の実施例に基づいて詳細に説明す
る。[Embodiments of the Invention] The present invention will be described in detail based on illustrated embodiments.
第１図は本発明の血流計のブロツク回路構成図
である。ここでは、１はプローブであり、このプ
ローブには送光フアイバ２、受光フアイバ３を介
してそれぞれレーザー光源４、光電検知器５が接
続されている。光電検知器５の出力は増幅器６に
接続され、増幅器６の出力はデータ処理部７、ハ
イパスフイルタ８に接続されている。ハイパスフ
イルタ８の出力は絶対値回路９、積分器１０を介
してデータ処理部７に接続され、データ処理部７
の出力は表示器１１、制御回路１２に接続されて
いる。 FIG. 1 is a block circuit diagram of a blood flow meter according to the present invention. Here, 1 is a probe, and a laser light source 4 and a photoelectric detector 5 are connected to this probe via a light transmitting fiber 2 and a light receiving fiber 3, respectively. The output of the photoelectric detector 5 is connected to an amplifier 6, and the output of the amplifier 6 is connected to a data processing section 7 and a high-pass filter 8. The output of the high-pass filter 8 is connected to the data processing section 7 via the absolute value circuit 9 and the integrator 10.
The output of is connected to a display 11 and a control circuit 12.
レーザー光源４から発したレーザー光は、送光
フアイバ２を通りプローブ１を介して外部に照射
される。出射されたレーザー光はプローブ１に或
る物体Ｓが接近或いは接触していると、その散乱
光が再びプローブ１に戻り、受光フアイバ３を通
つて光電検出器５で電気信号に変換され、増幅器
６で増幅された後にデータ処理部７とハイパスフ
イルタ８に分けられる。ハイパスフイルタ８を通
過した交流信号は絶対値回路９により整流され、
積分器１０によつて積分し安定した信号とされ、
その出力をデータ処理部７に入力する。データ処
理部７はこの入力信号が或る一定値を超えたら、
生態である物体Ｓが接近したとして制御回路１２
に信号を送り、制御回路１２は測定を開始するた
めの指令信号を出力する。通常の測定状態になれ
ば、データ処理部７は増幅器６からの信号を処理
して血流値を求め、表示部１１に表示する。 Laser light emitted from the laser light source 4 passes through the light transmission fiber 2 and is irradiated to the outside via the probe 1. When a certain object S approaches or contacts the emitted laser beam, the scattered light returns to the probe 1 again, passes through the light receiving fiber 3, is converted into an electric signal by the photoelectric detector 5, and is sent to the amplifier. After being amplified in step 6, the signal is divided into a data processing section 7 and a high-pass filter 8. The AC signal that has passed through the high-pass filter 8 is rectified by the absolute value circuit 9.
It is integrated by an integrator 10 and made into a stable signal,
The output is input to the data processing section 7. When this input signal exceeds a certain value, the data processing section 7
Assuming that an ecological object S approaches, the control circuit 12
The control circuit 12 outputs a command signal to start measurement. When the normal measurement state is reached, the data processing section 7 processes the signal from the amplifier 6 to obtain a blood flow value and displays it on the display section 11.
第２図、第３図はプローブ１を静止物体と生体
に当てた時のそれぞれのスペクトラム分布図であ
るが、遮断周波数F0を持つハイパスフイルタ８
を通すと、静止物体の場合は出力がレベルP0以
下となる。生体の場合の出力はレベルP0以上に
なり、レベルP0を基準に判断することにより静
止物体と生体とを区別することができる。 Figures 2 and 3 are spectrum distribution diagrams when the probe 1 is applied to a stationary object and a living body, respectively.
If the object is stationary, the output will be below the level P 0 . In the case of a living body, the output is at level P 0 or higher, and by making a judgment based on level P 0 , it is possible to distinguish between a stationary object and a living body.
このようにレーザー光が動いている物体に照射
されると、その散乱光の信号のパワースペクトラ
ムは周波数成分を持ち、静止している物体に照射
された散乱光のスペクトラム分布とは明らかに異
なる。そこで、交流成分の有無いよつてプローブ
１に接触している物体が生体か否か判断すること
ができる。 When a moving object is irradiated with a laser beam in this way, the power spectrum of the signal of the scattered light has frequency components, which is clearly different from the spectrum distribution of the scattered light that is irradiated onto a stationary object. Therefore, it can be determined whether the object in contact with the probe 1 is a living body or not based on the presence or absence of the alternating current component.
本実施例では、交流成分をハイパスフイルタ８
で取り出し、絶対値回路９により絶対値化し、そ
れを積分器１０によつて積分した信号が或る一定
の大きさ以上にあると、プローブ１に生体が接触
しているものと判断し、制御回路１２の指令によ
つて測定を開始するようにしたが、ハイパスフイ
ルタ８に代りにバンドパスフイルタを用いて、特
定の周波数信号のみを通過させるようにしても同
等の効果を得ることができる。 In this embodiment, the AC component is filtered through a high-pass filter 8.
If the signal obtained by extracting the signal from the probe 1, converting it into an absolute value by the absolute value circuit 9, and integrating it by the integrator 10 exceeds a certain level, it is determined that a living body is in contact with the probe 1, and the control is performed. Although the measurement is started in response to a command from the circuit 12, the same effect can be obtained by using a band pass filter instead of the high pass filter 8 to pass only a specific frequency signal.
［発明の効果］
以上説明したように本発明に係る血流計は、レ
ーザー光の散乱光の交流成分を検知し、その大き
さが十分大きいときにプローブが生体に接触して
いるとみなして測定を開始することにより、不必
要な測定動作を回避することができる。[Effects of the Invention] As explained above, the blood flow meter according to the present invention detects the alternating current component of the scattered light of the laser beam, and when the magnitude of the alternating current component is sufficiently large, it is determined that the probe is in contact with the living body. By starting the measurement, unnecessary measurement operations can be avoided.
図面は本発明に係る血流計の実施例を示し、第
１図はその構成図、第２図、第３図はプローブを
静止物体と生体にあてたときのそれぞれのスペク
トラム分布図である。
符号１はプローブ、２は送光フアイバ、３は受
光フアイバ、４はレーザー光源、５は光電検知
器、６は増幅器、７はデータ処理部、８はハイパ
スフイルタ、９は絶対値回路、１０は積分器、１
１は表示部、１２は制御回路である。
The drawings show an embodiment of a blood flow meter according to the present invention, and FIG. 1 is a configuration diagram thereof, and FIGS. 2 and 3 are spectrum distribution diagrams when a probe is applied to a stationary object and a living body, respectively. 1 is a probe, 2 is a light transmitting fiber, 3 is a light receiving fiber, 4 is a laser light source, 5 is a photoelectric detector, 6 is an amplifier, 7 is a data processing section, 8 is a high pass filter, 9 is an absolute value circuit, 10 is a Integrator, 1
1 is a display section, and 12 is a control circuit.
Claims (1)
ーブに送出し、該プローブから照射されるレーザ
ー光の生体からの散乱光を第２の光結合手段を介
して光電検出器に導き、該光電検出器から出力さ
れる信号を解析して血流状態を測定する血流計に
おいて、前記第２の光結合手段を介した光を光電
変換することにより得られる電気信号の交流成分
を取出し、その大きさに基づいて前記プローブが
生体に接近したことを検知する検知手段と、該検
知手段の出力に基づいて前記測定を開始させる制
御手段とを有することを特徴とする血流計。 ２ 前記検知手段は交流成分を取り出した後に整
流して積分し、その積分レベルにより前記検知を
行うようにした特許請求の範囲第１項記載の血流
計。 ３ 前記交流成分はバンドパスフイルタを用いて
取り出すようにした特許請求の範囲第１項記載の
血流計。[Claims] 1. A laser beam is sent to a probe via a first optical coupling means, and the scattered light from the living body of the laser beam irradiated from the probe is photoelectrically detected via a second optical coupling means. In a blood flow meter that measures the state of blood flow by analyzing the signal output from the photoelectric detector, the electrical signal obtained by photoelectrically converting the light via the second optical coupling means. Blood, characterized by having a detection means for extracting an alternating current component and detecting that the probe approaches a living body based on the magnitude thereof, and a control means for starting the measurement based on the output of the detection means. Flow meter. 2. The blood flow meter according to claim 1, wherein the detection means extracts the alternating current component, rectifies it and integrates it, and performs the detection based on the level of the integration. 3. The blood flow meter according to claim 1, wherein the alternating current component is extracted using a band pass filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62172629A JPS6415031A (en) | 1987-07-10 | 1987-07-10 | Blood flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62172629A JPS6415031A (en) | 1987-07-10 | 1987-07-10 | Blood flowmeter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6415031A JPS6415031A (en) | 1989-01-19 |
| JPH0466575B2 true JPH0466575B2 (en) | 1992-10-23 |
Family
ID=15945418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62172629A Granted JPS6415031A (en) | 1987-07-10 | 1987-07-10 | Blood flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6415031A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6907475B2 (en) * | 2016-07-15 | 2021-07-21 | 富士フイルムビジネスイノベーション株式会社 | Biometric information measuring device and biometric information measuring program |
| JP6988061B2 (en) * | 2016-07-15 | 2022-01-05 | 富士フイルムビジネスイノベーション株式会社 | Biometric information measuring device and biometric information measuring program |
| WO2024157638A1 (en) * | 2023-01-25 | 2024-08-02 | ソニーグループ株式会社 | Information processing device, information processing method, and program |
-
1987
- 1987-07-10 JP JP62172629A patent/JPS6415031A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6415031A (en) | 1989-01-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |