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1. WO2007143543 - SYSTEM AND METHOD FOR ESTIMATING OXYGEN CONCENTRATION IN A MIXED GAS EXPERIENCING PRESSURE FLUCTUATIONS

Publication Number WO/2007/143543
Publication Date 13.12.2007
International Application No. PCT/US2007/070214
International Filing Date 01.06.2007
IPC
A61B 5/083 2006.01
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
5Measuring for diagnostic purposes; Identification of persons
08Measuring devices for evaluating the respiratory organs
083Measuring rate of metabolism by using breath test, e.g. measuring rate of oxygen consumption
G01N 27/49 2006.01
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
27Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means
26by investigating electrochemical variables; by using electrolysis or electrophoresis
416Systems
49Systems involving the determination of the current at a single specific value, or small range of values, of applied voltage for producing selective measurement of one or more particular ionic species
G01N 33/497 2006.01
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
33Investigating or analysing materials by specific methods not covered by groups G01N1/-G01N31/131
48Biological material, e.g. blood, urine; Haemocytometers
483Physical analysis of biological material
497of gaseous biological material, e.g. breath
CPC
A61M 16/021
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY
16Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
021operated by electrical means
A61M 16/085
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY
16Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
08Bellows; Connecting tubes
0816Joints or connectors
0841for sampling
085Gas sampling
A61M 16/12
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY
16Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
10Preparation of respiratory gases or vapours
12by mixing different gases
A61M 2016/1025
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY
16Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
10Preparation of respiratory gases or vapours
1005with O2 features or with parameter measurement
102Measuring a parameter of the content of the delivered gas
1025the O2 concentration
G01N 27/404
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
27Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means
26by investigating electrochemical variables; by using electrolysis or electrophoresis
403Cells and electrode assemblies
404Cells with anode, cathode and cell electrolyte on the same side of a permeable membrane which separates them from the sample fluid ; , e.g. Clark-type oxygen sensors
G01N 33/497
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
33Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
48Biological material, e.g. blood, urine
483Physical analysis of biological material
497of gaseous biological material, e.g. breath
Applicants
  • NELLCOR PURITAN BENNETT LLC [US]/[US] (AllExceptUS)
  • JAFARI, Mehdi, Matthew [US]/[US] (UsOnly)
Inventors
  • JAFARI, Mehdi, Matthew
Agents
  • NELLCOR PURITAN BENNETT LLC
Priority Data
11/421,94902.06.2006US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) SYSTEM AND METHOD FOR ESTIMATING OXYGEN CONCENTRATION IN A MIXED GAS EXPERIENCING PRESSURE FLUCTUATIONS
(FR) SYSTÈME ET PROCÉDÉ D'ESTIMATION DE LA CONCENTRATION D'OXYGÈNE DANS UN MÉLANGE GAZEUX SUBISSANT DES FLUCTUATIONS DE PRESSION
Abstract
(EN)
A method for estimating the concentration of a particular gas in a gas mixture having a fluctuating pressure is provided. A sensor output signal indicating the concentration of a particular gas in the gas mixture is received from a gas sensor. The received sensor output signal may vary over time due to the fluctuating pressure of the gas mixture. The received sensor output signal may be processed to determine an estimate of the concentration of the particular gas in the gas mixture. The processing includes performing an autocorrelation of the signal. In some embodiments, the particular gas is oxygen and the method is used to estimate the concentration of oxygen in a gas mixture having a fluctuating pressure.
(FR)
L'invention concerne un procédé d'estimation de la concentration d'un gaz particulier dans un mélange gazeux présentant une pression fluctuante. Un signal de sortie de capteur indiquant la concentration d'un gaz particulier dans le mélange gazeux est reçu d'un capteur de gaz. Le signal de sortie de capteur reçu peut varier dans le temps du fait de la pression fluctuante du mélange gazeux. Le signal de sortie de capteur reçu peut être traité pour déterminer une valeur estimée de la concentration du gaz particulier dans le mélange gazeux. Le traitement peut comprendre une étape consistant à effectuer une autocorrélation du signal. Dans certains modes de réalisation, le gaz particulier est de l'oxygène et le procédé est utilisé pour estimer la concentration d'oxygène dans un mélange gazeux présentant une pression fluctuante.
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