GB1325039A - Oximeter and method for in vivo determination of oxygen saturatiion in blood - Google Patents
Oximeter and method for in vivo determination of oxygen saturatiion in bloodInfo
- Publication number
- GB1325039A GB1325039A GB1325039DA GB1325039A GB 1325039 A GB1325039 A GB 1325039A GB 1325039D A GB1325039D A GB 1325039DA GB 1325039 A GB1325039 A GB 1325039A
- Authority
- GB
- United Kingdom
- Prior art keywords
- light
- tissue
- ear
- haemoglobin
- different
- 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
Classifications
-
- 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
- A61B5/14552—Details of sensors specially adapted therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6813—Specially adapted to be attached to a specific body part
- A61B5/6814—Head
- A61B5/6815—Ear
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/683—Means for maintaining contact with the body
- A61B5/6838—Clamps or clips
-
- 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
- G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Health & Medical Sciences (AREA)
- Pathology (AREA)
- Animal Behavior & Ethology (AREA)
- Veterinary Medicine (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Engineering & Computer Science (AREA)
- Biophysics (AREA)
- Public Health (AREA)
- Biomedical Technology (AREA)
- Otolaryngology (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
1325039 Blood oximeters R F SHAW 7 Oct 1970 47787/70 Heading G1A In a device for measuring the oxy-haemoglobin content of blood in a portion of human tissue, e. g. an ear 15, and in which the tissue contains N-1 other components which also have absorption coefficients which vary with wavelength, light passing through or scattered from the tissue is arranged to produce N+1 output signals each corresponding to absorption at one wavelength by one component, and these signals are combined to give an absolute measure of the amount of oxyhaemoglobin in the tissue. As shown, three electro-luminescent diodes 9, 11, 13 illuminate an ear 15 containing two absorbing species oxy-haemoglobin and (reduced) haemoglobin. Each diode emits a different wavelength, two of which are strongly absorbed by the two respective absorbing species, modulated at different frequencies. Light transmitted through the ear is received by three photo-cells 47-51, e.g. photo-multipliers or photo-diodes, each supplying a demodulator 53-57 tuned to one of the light source frequencies. The three demodulator outputs therefore represent the light absorption at the three incident wavelengths and are supplied to log gain amplifiers 23-27. The amplifier outputs feed a network of resistors 59-69 whose values are chosen empirically so that the output on the meter 43 represents the ratio of oxy-haemoglobin to haemoglobin, i. e. the oxygen content of the blood. The instrument must first be calibrated by introducing a number of blood samples of known different oxygen content into a suitable absorption cell, and choosing the resistors 59-69 to give "correct" readings on the meter in all cases. The demodulators may be dispensed with by providing each photo-cell with a different wavelength filter 52-56. Alternatively, a single detector may have its response to the different wavelengths separated out by synchronous demodulation at the three different light source frequencies, or by time sharing sequential operation of the sources. A single broadspectrum light source may be used with three filtered detectors, or with a single detector having associated therewith a filter wheel containing three different filters, the detecting cycles of the detector being synchronized with the wheel rotation. In this latter case, light guides convey light both from the source to the ear and from the ear to the detector. In a further embodiment a number of sources (91) in a circular configuration, Figs.3ab (not shown) irradiate a body portion and the light scattered from within the tissue is received by a number of detectors (47-51). A circular aperture (95) placed between the detectors and the tissue ensures that light both direct from the sources and also merely reflected from the tissue surface is not received by the detectors.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4778770 | 1970-10-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1325039A true GB1325039A (en) | 1973-08-01 |
Family
ID=10446244
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1325039D Expired GB1325039A (en) | 1970-10-07 | 1970-10-07 | Oximeter and method for in vivo determination of oxygen saturatiion in blood |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1325039A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2368032A1 (en) * | 1976-10-18 | 1978-05-12 | Oximetrix | EQUIPMENT FOR REFERENCE OPTICAL DIFFUSER MEDIUM |
FR2450594A1 (en) * | 1979-03-07 | 1980-10-03 | Sumitomo Electric Industries | METHOD FOR MEASURING THE RESPIRATORY FUNCTION OF A BIOLOGICAL ORGAN AND TISSUE |
EP0619981A1 (en) * | 1993-04-12 | 1994-10-19 | Ohmeda Inc. | Arterial blood monitoring probe |
WO1999032030A1 (en) * | 1997-12-22 | 1999-07-01 | Btg International Limited | Artefact reduction in photoplethysmography |
US9883824B2 (en) | 2012-08-20 | 2018-02-06 | Taiwan Biophotonic Corporation | Detecting device |
-
1970
- 1970-10-07 GB GB1325039D patent/GB1325039A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2368032A1 (en) * | 1976-10-18 | 1978-05-12 | Oximetrix | EQUIPMENT FOR REFERENCE OPTICAL DIFFUSER MEDIUM |
FR2450594A1 (en) * | 1979-03-07 | 1980-10-03 | Sumitomo Electric Industries | METHOD FOR MEASURING THE RESPIRATORY FUNCTION OF A BIOLOGICAL ORGAN AND TISSUE |
EP0619981A1 (en) * | 1993-04-12 | 1994-10-19 | Ohmeda Inc. | Arterial blood monitoring probe |
WO1999032030A1 (en) * | 1997-12-22 | 1999-07-01 | Btg International Limited | Artefact reduction in photoplethysmography |
US9883824B2 (en) | 2012-08-20 | 2018-02-06 | Taiwan Biophotonic Corporation | Detecting device |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PE20 | Patent expired after termination of 20 years |