CA2092703A1 - Arterial co2 monitor and closed loop controller - Google Patents

Arterial co2 monitor and closed loop controller

Info

Publication number
CA2092703A1
CA2092703A1 CA2092703A CA2092703A CA2092703A1 CA 2092703 A1 CA2092703 A1 CA 2092703A1 CA 2092703 A CA2092703 A CA 2092703A CA 2092703 A CA2092703 A CA 2092703A CA 2092703 A1 CA2092703 A1 CA 2092703A1
Authority
CA
Canada
Prior art keywords
patient
ratio
deadspace
paco2
breath
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.)
Granted
Application number
CA2092703A
Other languages
French (fr)
Other versions
CA2092703C (en
Inventor
John Stuart Packer
John Francis Cade
Eng-Boon Law (Lawrence)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
University of Melbourne
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Publication of CA2092703A1 publication Critical patent/CA2092703A1/en
Application granted granted Critical
Publication of CA2092703C publication Critical patent/CA2092703C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • A61B5/091—Measuring volume of inspired or expired gases, e.g. to determine lung capacity
    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0051—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes with alarm devices
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/021—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes operated by electrical means
    • A61M16/022—Control means therefor
    • A61M16/024—Control means therefor including calculation means, e.g. using a processor
    • A61M16/026—Control means therefor including calculation means, e.g. using a processor specially adapted for predicting, e.g. for determining an information representative of a flow limitation during a ventilation cycle by using a root square technique or a regression analysis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2230/00—Measuring parameters of the user
    • A61M2230/20—Blood composition characteristics
    • A61M2230/202—Blood composition characteristics partial carbon oxide pressure, e.g. partial dioxide pressure (P-CO2)

Abstract

The arterial CO2 monitor and closed loop controller for use with a ventilator monitors a patient's breath and determines PaCO2 based upon a determination of a deadspace ratio, which is the ratio of the alveolar deadspace to alveolar tidal volume. The method generally comprises the steps of continuously monitoring measurable parameter of a patient's breath;
obtaining an input value of PaCO2 from a blood sample of the patient and using the patient's breath parameters and the input value to calculate the deadspace ratio; and continuously determining PaCO2 based on the assumption that the dead-space ratio subsequently remains constant. Decision rules obtained from other measurable data are preferably also used to identify the onset of changes in the deadspace ratio, and a new deadspace ratio is then determined from the patient's breath parameters and further input value of PaCO2 from the patient's blood sample.
CA002092703A 1990-09-19 1991-09-19 Arterial co2 monitor and closed loop controller Expired - Lifetime CA2092703C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPK2403 1990-09-19
AUPK240390 1990-09-19

Publications (2)

Publication Number Publication Date
CA2092703A1 true CA2092703A1 (en) 1992-03-20
CA2092703C CA2092703C (en) 1998-06-30

Family

ID=3774966

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002092703A Expired - Lifetime CA2092703C (en) 1990-09-19 1991-09-19 Arterial co2 monitor and closed loop controller

Country Status (6)

Country Link
US (1) US5402796A (en)
EP (1) EP0549685B1 (en)
JP (1) JP2688453B2 (en)
CA (1) CA2092703C (en)
DE (1) DE69131836T2 (en)
WO (1) WO1992004865A1 (en)

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EP0549685A4 (en) 1997-12-29
US5402796A (en) 1995-04-04
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JPH06502090A (en) 1994-03-10

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