JP6385865B2 - パルスフォトメータ - Google Patents
パルスフォトメータ Download PDFInfo
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- JP6385865B2 JP6385865B2 JP2015054995A JP2015054995A JP6385865B2 JP 6385865 B2 JP6385865 B2 JP 6385865B2 JP 2015054995 A JP2015054995 A JP 2015054995A JP 2015054995 A JP2015054995 A JP 2015054995A JP 6385865 B2 JP6385865 B2 JP 6385865B2
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- 238000002835 absorbance Methods 0.000 claims description 44
- 239000008280 blood Substances 0.000 claims description 40
- 210000004369 blood Anatomy 0.000 claims description 40
- 239000000126 substance Substances 0.000 claims description 17
- 238000000926 separation method Methods 0.000 claims description 15
- 230000010349 pulsation Effects 0.000 description 9
- 230000008033 biological extinction Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 108010054147 Hemoglobins Proteins 0.000 description 5
- 102000001554 Hemoglobins Human genes 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- PXFBZOLANLWPMH-UHFFFAOYSA-N 16-Epiaffinine Natural products C1C(C2=CC=CC=C2N2)=C2C(=O)CC2C(=CC)CN(C)C1C2CO PXFBZOLANLWPMH-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 108010061951 Methemoglobin Proteins 0.000 description 1
- 108010064719 Oxyhemoglobins Proteins 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
- A61B5/14551—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters for measuring blood gases
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/02416—Detecting, measuring or recording pulse rate or heart rate using photoplethysmograph signals, e.g. generated by infrared radiation
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/74—Details of notification to user or communication with user or patient ; user input means
- A61B5/7405—Details of notification to user or communication with user or patient ; user input means using sound
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/74—Details of notification to user or communication with user or patient ; user input means
- A61B5/742—Details of notification to user or communication with user or patient ; user input means using visual displays
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/74—Details of notification to user or communication with user or patient ; user input means
- A61B5/7455—Details of notification to user or communication with user or patient ; user input means characterised by tactile indication, e.g. vibration or electrical stimulation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/483—Physical analysis of biological material
- G01N33/487—Physical analysis of biological material of liquid biological material
- G01N33/49—Blood
- G01N33/4925—Blood measuring blood gas content, e.g. O2, CO2, HCO3
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
- A61B5/7207—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal of noise induced by motion artifacts
- A61B5/7214—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal of noise induced by motion artifacts using signal cancellation, e.g. based on input of two identical physiological sensors spaced apart, or based on two signals derived from the same sensor, for different optical wavelengths
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7221—Determining signal validity, reliability or quality
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/061—Sources
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/12—Circuits of general importance; Signal processing
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- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- General Health & Medical Sciences (AREA)
- Pathology (AREA)
- Molecular Biology (AREA)
- Biophysics (AREA)
- Medical Informatics (AREA)
- Veterinary Medicine (AREA)
- Heart & Thoracic Surgery (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- Public Health (AREA)
- Chemical & Material Sciences (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Hematology (AREA)
- Cardiology (AREA)
- Immunology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
- Ecology (AREA)
- Optics & Photonics (AREA)
- Urology & Nephrology (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Physiology (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Description
互いに波長が異なる少なくとも3種の光を出射する発光部と、
被検者の生体を透過あるいは反射した前記少なくとも3種の光の各々の強度に応じて少なくとも3種の強度信号を出力する受光部と、
前記少なくとも3種の光から選ばれた第1の組合せの2種の光に係る前記強度信号に基づいて第1信号成分と第1ノイズ成分を分離する第1信号分離部と、
前記少なくとも3種の光から選ばれた第2の組合せの2種の光に係る前記強度信号に基づいて第2信号成分と第2ノイズ成分を分離する第2信号分離部と、
前記第1信号成分の吸光度比と前記第1ノイズ成分の吸光度比の第1差分が第1所定値未満であるかを判定する第1判定部と、
前記第1差分が前記第1所定値未満であると判定された場合に、前記第2信号成分の吸光度比と前記第2ノイズ成分の吸光度比の第2差分が第2所定値未満であるかを判定する第2判定部と、
前記第1差分が前記第1所定値以上であると判定された場合に、前記第1信号成分の基本周波数に基づいて前記被検者の血中吸光物質濃度を算出し、前記第2差分が前記第2所定値以上であると判定された場合に、前記第2信号成分の基本周波数に基づいて前記血中吸光物質濃度を算出する濃度算出部を備えている。
Φ1=tanφ1 (6)
ΔA1=ln[I1s/(I1s−ΔI1s)]≒ΔI1s/I1s (7)
ΔA2=ln[I2s/(I2s−ΔI2s)]≒ΔI2s/I2s (8)
ΔA3=ln[I3s/(I3s−ΔI3s)]≒ΔI3s/I3s (9)
ここでΔI1s、ΔI2s、ΔI3sは、血液の脈動に伴う第1の光、第2の光、および第3の光に係る出力信号の変化を示している。
ΔA1=ΔAb1+ΔAt1=E1HbΔDb+Z1ΔDt (10)
ΔA2=ΔAb2+ΔAt2=E2HbΔDb+Z2ΔDt (11)
ΔA3=ΔAb3+ΔAt3=E3HbΔDb+Z3ΔDt (12)
ここで、Eは吸光係数(dl g-1cm-1)、Hbは血中ヘモグロビン濃度(g dl-1)、Zは血液以外の組織の減光率(cm-1)、ΔDは血液の脈動に伴う厚み変化(cm)を表している。添え字bは血液を、添え字tは血液以外の組織を、添え字1は第1の光を、添え字2は第2の光を、添え字3は第3の光を表している。
Ab21=ΔA2−ΔA1=(E2−E1)HbΔDb (13)
Ab23=ΔA2−ΔA3=(E2−E3)HbΔDb (14)
右辺には血液の情報のみが含まれている。したがって、減光度変化量ΔA1と減光度変化量ΔA2の差分、および減光度変化量ΔA2と減光度変化量ΔA3の差分をとることにより、血液由来の減光度変化量Ab21、Ab23を得ることができる。
Ab23/Ab21 =(ΔA2−ΔA3)/(ΔA2−ΔA1)
=(E2−E3)/(E2−E1) (15)
ここで(15)式における(E2−E1)、(E2−E3)は、SpO2の関数である。したがって、(E2−E1)と(E2−E3)の比もまたSpO2の関数となる。百分率表記であるSpO2をSと少数表記すると、各吸光係数E1、E2、E3は、次式で表わされる。
E1=Eo1S+Er1(1−S) (16)
E2=Eo2S+Er2(1−S) (17)
E3=Eo3S+Er3(1−S) (18)
ここで、Eoは酸化ヘモグロビンの吸光係数を、Erは脱酸化ヘモグロビンの吸光係数を表している。上記と同様に、添え字1は第1の光を、添え字2は第2の光を、添え字3は第3の光を表している。
λ1=660nm、λ2=700nm、λ3=730nm、λ4=880nm
λ1=660nm、λ2=700nm、λ3=880nm、λ4=940nm
Claims (6)
- 互いに波長が異なる少なくとも3種の光を出射する発光部と、
被検者の生体を透過あるいは反射した前記少なくとも3種の光の各々の強度に応じて少なくとも3種の強度信号を出力する受光部と、
前記少なくとも3種の光から選ばれた第1の組合せの2種の光に係る前記強度信号に基づいて第1信号成分と第1ノイズ成分を分離する第1信号分離部と、
前記少なくとも3種の光から選ばれた第2の組合せの2種の光に係る前記強度信号に基づいて第2信号成分と第2ノイズ成分を分離する第2信号分離部と、
前記第1信号成分の吸光度比と前記第1ノイズ成分の吸光度比の第1差分が第1所定値未満であるかを判定する第1判定部と、
前記第1差分が前記第1所定値未満であると判定された場合に、前記第2信号成分の吸光度比と前記第2ノイズ成分の吸光度比の第2差分が第2所定値未満であるかを判定する第2判定部と、
前記第1差分が前記第1所定値以上であると判定された場合に、前記第1信号成分の基本周波数に基づいて前記被検者の血中吸光物質濃度を算出し、前記第2差分が前記第2所定値以上であると判定された場合に、前記第2信号成分の基本周波数に基づいて前記血中吸光物質濃度を算出する濃度算出部を備えている、パルスフォトメータ。 - 前記第1の組合せと前記第2の組合せの各々は、前記2種の光として赤外光と赤色光を含んでいる、請求項1に記載のパルスフォトメータ。
- 前記第2差分が前記第2所定値未満であると判定された場合に、エラー状態を報知する報知部を備えている、請求項1または2に記載のパルスフォトメータ。
- 前記少なくとも3種の光の波長は、660nm、700nm、および880nmである、請求項1から3に記載のパルスフォトメータ。
- 前記少なくとも3種の光は、各波長が660nm、700nm、730nm、および880nmである4種の光を含んでいる、請求項4に記載のパルスフォトメータ。
- 前記少なくとも3種の光は、各波長が660nm、700nm、880nm、および940nmである4種の光を含んでいる、請求項4に記載のパルスフォトメータ。
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JP2015054995A JP6385865B2 (ja) | 2014-03-28 | 2015-03-18 | パルスフォトメータ |
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JP2014068791 | 2014-03-28 | ||
JP2014068791 | 2014-03-28 | ||
JP2015054995A JP6385865B2 (ja) | 2014-03-28 | 2015-03-18 | パルスフォトメータ |
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JP2015192865A JP2015192865A (ja) | 2015-11-05 |
JP6385865B2 true JP6385865B2 (ja) | 2018-09-05 |
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US (2) | US9854999B2 (ja) |
EP (1) | EP2923639B1 (ja) |
JP (1) | JP6385865B2 (ja) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
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US10004408B2 (en) | 2014-12-03 | 2018-06-26 | Rethink Medical, Inc. | Methods and systems for detecting physiology for monitoring cardiac health |
RU2645943C1 (ru) * | 2016-10-04 | 2018-02-28 | Общество с ограниченной ответственностью "ТЕЛЕБИОМЕТ" | Способ неинвазивного определения концентраций компонентов крови |
JP6794219B2 (ja) * | 2016-10-27 | 2020-12-02 | 日本光電工業株式会社 | 医用フォトメータ、および医用フォトメータの制御方法 |
JP6857484B2 (ja) * | 2016-10-27 | 2021-04-14 | 日本光電工業株式会社 | 医用フォトメータ、および医用フォトメータの制御方法 |
JP6847627B2 (ja) * | 2016-10-27 | 2021-03-24 | 日本光電工業株式会社 | 医用フォトメータ、および医用フォトメータの制御方法 |
JP7278102B2 (ja) * | 2019-02-25 | 2023-05-19 | フクダ電子株式会社 | 生体信号解析装置およびその制御方法 |
JP2022045590A (ja) | 2020-09-09 | 2022-03-22 | 日本光電工業株式会社 | プローブ、およびパルスフォトメトリシステム |
JP2022057749A (ja) * | 2020-09-30 | 2022-04-11 | 日本光電工業株式会社 | 生体パラメータ演算装置、コンピュータプログラムおよび非一時的コンピュータ可読媒体 |
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US4623248A (en) * | 1983-02-16 | 1986-11-18 | Abbott Laboratories | Apparatus and method for determining oxygen saturation levels with increased accuracy |
JPH03136637A (ja) * | 1989-10-24 | 1991-06-11 | Nippon Koden Corp | 非観血式血中成分濃度測定装置 |
US6662033B2 (en) * | 1994-04-01 | 2003-12-09 | Nellcor Incorporated | Pulse oximeter and sensor optimized for low saturation |
DE19537646C2 (de) * | 1995-10-10 | 1998-09-17 | Hewlett Packard Gmbh | Verfahren und Vorrichtung zum Erkennen verfälschter Meßwerte in der Pulsoximetrie zur Messung der Sauerstoffsättigung |
US6226540B1 (en) * | 1995-12-13 | 2001-05-01 | Peter Bernreuter | Measuring process for blood gas analysis sensors |
US6163715A (en) | 1996-07-17 | 2000-12-19 | Criticare Systems, Inc. | Direct to digital oximeter and method for calculating oxygenation levels |
EP1082050B1 (en) * | 1998-06-03 | 2011-08-24 | Masimo Corporation | Stereo pulse oximeter |
IL138884A (en) * | 2000-10-05 | 2006-07-05 | Conmed Corp | Pulse oximeter and a method of its operation |
JP4352315B2 (ja) * | 2002-10-31 | 2009-10-28 | 日本光電工業株式会社 | 信号処理方法/装置及びそれを用いたパルスフォトメータ |
JP2004202190A (ja) * | 2002-11-08 | 2004-07-22 | Minolta Co Ltd | 生体情報測定装置 |
JP4284674B2 (ja) | 2003-01-31 | 2009-06-24 | 日本光電工業株式会社 | 血中吸光物質濃度測定装置 |
JP4196209B2 (ja) * | 2003-06-30 | 2008-12-17 | 日本光電工業株式会社 | 信号処理方法及びそれを適用したパルスフォトメータ |
US7025728B2 (en) | 2003-06-30 | 2006-04-11 | Nihon Kohden Corporation | Method for reducing noise, and pulse photometer using the method |
US8798702B2 (en) | 2011-03-31 | 2014-08-05 | Covidien Lp | Multiplexed photodetector array for optical medical sensors |
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- 2015-03-18 JP JP2015054995A patent/JP6385865B2/ja active Active
- 2015-03-19 US US14/662,476 patent/US9854999B2/en active Active
- 2015-03-20 EP EP15160123.4A patent/EP2923639B1/en active Active
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- 2017-11-21 US US15/819,619 patent/US10702196B2/en active Active
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Publication number | Publication date |
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EP2923639B1 (en) | 2017-11-15 |
US20180092579A1 (en) | 2018-04-05 |
US10702196B2 (en) | 2020-07-07 |
US9854999B2 (en) | 2018-01-02 |
US20150272488A1 (en) | 2015-10-01 |
EP2923639A1 (en) | 2015-09-30 |
JP2015192865A (ja) | 2015-11-05 |
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