WO1993009413A3 - Filter selection for shutterless optically stabilized capnograph - Google Patents

Filter selection for shutterless optically stabilized capnograph Download PDF

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Publication number
WO1993009413A3
WO1993009413A3 PCT/US1992/009028 US9209028W WO9309413A3 WO 1993009413 A3 WO1993009413 A3 WO 1993009413A3 US 9209028 W US9209028 W US 9209028W WO 9309413 A3 WO9309413 A3 WO 9309413A3
Authority
WO
WIPO (PCT)
Prior art keywords
capnographs
shutterless
thermopiles
constituents
optically
Prior art date
Application number
PCT/US1992/009028
Other languages
French (fr)
Other versions
WO1993009413A2 (en
Inventor
Mark L Yelderman
James R Braig
Daniel S Goldberger
Original Assignee
Critikon Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US07/782,991 external-priority patent/US5281817A/en
Application filed by Critikon Inc filed Critical Critikon Inc
Publication of WO1993009413A2 publication Critical patent/WO1993009413A2/en
Publication of WO1993009413A3 publication Critical patent/WO1993009413A3/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
    • A61B5/083—Measuring rate of metabolism by using breath test, e.g. measuring rate of oxygen consumption
    • A61B5/0836—Measuring rate of CO2 production
    • 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
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
    • G01J5/12—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using thermoelectric elements, e.g. thermocouples

Abstract

Methods and apparatus for constructing optically stabilized, shutterless infrared capnographs are disclosed. The capnographs of the present invention provide the absolute concentration of the constituents of the respiratory airstream of a patient, without thermal drift problems normally associated with thermopile detectors, thereby providing a device with a high degree of accuracy. The present invention eliminates the need for a mechanical shutter to modulates the incident infrared beam and the need for a modulated source, thereby increasing the reliability and response time of the devices disclosed. Capnographs which are substantially unaffected by changes in the ambient temperature at which they operate are provided by connecting pairs of optically filtered thermopiles in series and processing the resulting differential pair. In addition, techniques are provided for selecting overlapping optical filters for use with thermopiles with a minimum level of cross-talk. A processing technique is also given which allows the concentrations of two or more airstream constituents to be separately quantified even when such overlapping optical filters are used.
PCT/US1992/009028 1991-10-28 1992-10-21 Filter selection for shutterless optically stabilized capnograph WO1993009413A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US782,991 1991-10-28
US07/782,991 US5281817A (en) 1989-09-01 1991-10-28 Method of selecting an optical filter for a shutterless optically stabilized capnograph

Publications (2)

Publication Number Publication Date
WO1993009413A2 WO1993009413A2 (en) 1993-05-13
WO1993009413A3 true WO1993009413A3 (en) 1993-06-10

Family

ID=25127843

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1992/009028 WO1993009413A2 (en) 1991-10-28 1992-10-21 Filter selection for shutterless optically stabilized capnograph

Country Status (4)

Country Link
AU (1) AU2888092A (en)
PT (1) PT101016A (en)
WO (1) WO1993009413A2 (en)
ZA (1) ZA928319B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI934871A0 (en) * 1993-11-03 1993-11-03 Instrumentarium Oy Foerfarande ochordord Foer compensating av vaermekrypningen hos en gasanalysator
EP0733341B1 (en) * 1995-02-24 2003-08-20 Nihon Kohden Corporation Capnometer
FI112824B (en) * 1999-04-08 2004-01-15 Wallac Oy Procedure for the analysis of exhaled gas
DE10322860B4 (en) * 2003-05-21 2005-11-03 X-Fab Semiconductor Foundries Ag Circuit arrangement for reading out electronic signals from high-resolution thermal sensors
RU2499235C2 (en) * 2009-04-17 2013-11-20 Данфосс Икса А/С Gas sensor using band-pass filters to measure source temperature
JP6113080B2 (en) * 2011-01-25 2017-04-12 コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． System and method for performing heaterless lead selenide-based capnometry and / or capnography

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4423739A (en) * 1981-08-24 1984-01-03 Andros Analyzers Incorporated End tidal carbon dioxide gas analyzer
US4914719A (en) * 1989-03-10 1990-04-03 Criticare Systems, Inc. Multiple component gas analyzer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4423739A (en) * 1981-08-24 1984-01-03 Andros Analyzers Incorporated End tidal carbon dioxide gas analyzer
US4914719A (en) * 1989-03-10 1990-04-03 Criticare Systems, Inc. Multiple component gas analyzer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
COMPUTERIZED QUANTITATIVE INFRARED ANALYSIS, 1987, D.M. HAALAND, 78-94. *

Also Published As

Publication number Publication date
PT101016A (en) 1994-01-31
AU2888092A (en) 1993-06-07
WO1993009413A2 (en) 1993-05-13
ZA928319B (en) 1993-05-18

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