EP0125274A1 - Agencement permettant de mesurer des flux respiratoires bidirectionnels sans accroitre l'espace mort - Google Patents

Agencement permettant de mesurer des flux respiratoires bidirectionnels sans accroitre l'espace mort

Info

Publication number
EP0125274A1
EP0125274A1 EP19830903599 EP83903599A EP0125274A1 EP 0125274 A1 EP0125274 A1 EP 0125274A1 EP 19830903599 EP19830903599 EP 19830903599 EP 83903599 A EP83903599 A EP 83903599A EP 0125274 A1 EP0125274 A1 EP 0125274A1
Authority
EP
European Patent Office
Prior art keywords
tube
arrangement
venturi
gas
measuring
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.)
Withdrawn
Application number
EP19830903599
Other languages
German (de)
English (en)
Inventor
Dag Linnarsson
Tommy Ribbe
Georg Matell
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.)
Karolinska Institutet
Original Assignee
Karolinska Institutet
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 Karolinska Institutet filed Critical Karolinska Institutet
Publication of EP0125274A1 publication Critical patent/EP0125274A1/fr
Withdrawn legal-status Critical Current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—Measuring devices for evaluating the respiratory organs
    • A61B5/087—Measuring breath flow

Definitions

  • the present invention relates to an arrangement for measuring two-way or bidirectional respiration gas flows w ithout increasing the dead space.
  • Such an arrangement includes a hose which is connected to the breathing passages of a patient and which , via a Y-piece , is connected to a tube for inspiration gas and a tube for -
  • a hose 1 is connected to the breating passages of the patient. 5 That end of the hose 1 which extends away from the patient is connected to a Y-piece 2, to which is connected two tubes 3 and 4. Unidirectional flow for alternating inspiration gas is effected through the one tube 3 and for expiration gas through the other tube 4.
  • the tubes are, in turn, connected to a respirator or breathing 0 apparatus not shown.
  • the known technique employs various kinds of flow meter, for example: 1 ) Respiration flow meters according to Fleisch, incorporating inserts having narrow, mutually parallel channels. The pressure drop across the inserts is proportional to the flow. The flow meter is symmetrical, and measures in both directions.
  • Vortex meters in which a rod is placed perpendicular to the gas flow, so as to generate vortices.
  • the vortices move as swiftly as the gas and can be detected with the aid of ultrasonic devices.
  • the vortex meter is intended for flow in one direction only.
  • Venturi tubes which are provided with a constriction, such that the gas moves at a faster rate and the lateral pressure falls. Downstream of the constriction there is an elongate gradual transition to the "general" diameter of the gas tube.
  • the difference is lateral pressure between a location immediately upstream of the constriction to the narrowest location thereof is proportional to the square of the flow.
  • the total drop in pressure over the whole of the venturi tube is much lower than the pressure difference measured in the first instance.
  • the lateral pressure in the constricted area of the tube is lower than the lateral pressure upstream and downstream of the constriction. Consequently, the flow can be measured by determining the difference is lateral pressure between the narrowest part of the constriction and the lateral pressure downstream of the venturi tube.
  • the differential pressure thus measured is 20-30% lower than the difference in pressure which prevails simultaneously between an upstream location and the narrowest location of the constriction.
  • the venturi tube is intended for flow in one direction.
  • Routines for setting the arrangement to zero are necessary in all methods, except for the vortex method.
  • the object of the present invention is to improve the aforementioned techniques for measuring the bidi rectional respiration f lows of anaesthetized patients or patients under intensive care.
  • the invention is mainly characterized in that a pressure-differential meter having two inlets or inputs is connected to the inlet of each venturi 's device, that a magnet valve is arranged to connect the two inlets together periodically; and that an electronic means is arranged to ca lculate the measured value and to control setting of the arrangement to zero, said electronic means to this end being electrical ly connected to the pressure- differential meter and to the magnet values.
  • a pressure-differential meter having two inlets or inputs is connected to the inlet of each venturi 's device, that a magnet valve is arranged to connect the two inlets together periodically; and that an electronic means is arranged to ca lculate the measured value and to control setting of the arrangement to zero, said electronic means to this end being electrical ly connected to the pressure- differential meter and to the magnet values.
  • the invention is illustrated schematically in Figure 2 and relates to a venturi-tube meter, which offers many advantages when used as a respi ration flow meter, as will be gathered from the resume above.
  • a tube 1 connected to the breathing passages of a patient is connected to an inspiration tube 3 and an expiration tube 4, via a Y-piece 2.
  • a venturi means In each of these tubes there is arranged a venturi means, the latter being arranged to co-act with a common transducer means in the form of a pressure differential meter 8 and to indicate the flow electrically.
  • the meter 8 is connected to the venturi means in the tube 3 via a first line 5, and to the venturi means in the tube 4 via a second line 6.
  • An annular chamber 5 'and 6* connects the lateral orifices together at the narrowest location of the venturi means.
  • Connected across the two inputs of the meter 8 is a short line 10.
  • Zero-setting of the transducer is essential for obtaining a correct measurement.
  • simple zero-balancing' of the pressure differential meter 8 is effected by intermittently (e.g. each hour) connecting both inlets of the meter to the same pressure, by means of a magnet valvue 7 (by rotating the valve body 90 , as shown by the arrow in Figure 2).
  • An electronic means 9 for calculating the measured value and for controlling the zero-setting of the transducers is arranged to control the setting of the valve 7 and to lineate the measured pressure-differential signal, so that it can be presented as a calibrated flow signal. Flow will be present alternately in either the inspiration tubes 3 or the expiration tube 4. The pressure signal will have different characteristics, depending upon which of the two tubes 3 , 4 is through-passed by gas.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Molecular Biology (AREA)
  • Pulmonology (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Physiology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Physics & Mathematics (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Measuring Volume Flow (AREA)

Abstract

Agencement de mesure d'un flux respiratoire bidirectionnel, comprenant une conduite (1) qui est reliée au passage respiratoire d'un patient et qui, au travers d'une pièce en Y (2), est également reliée à un tube (3) pour le gaz inspiré et à un tube (4) pour le gaz expiré. Les tubes (3, 4) sont reliés à un appareil respiratoire. Chaque tube est pourvu d'un organe de venturi. Selon l'invention un manomètre différentiel (8) possédant deux orifices d'admission est relié avec un orifice d'admission à chaque organe de venturi. Une vanne magnétique (7) permet de relier périodiquement les deux orifices d'entrée entre eux, et un organe électronique (9) permet de calculer la vanne mesurée et pour commander le réglage au point zéro. A cet effet l'organe de commande est relié électriquement au manomètre différentiel (8) et à la vanne magnétique (7).
EP19830903599 1982-11-02 1983-10-28 Agencement permettant de mesurer des flux respiratoires bidirectionnels sans accroitre l'espace mort Withdrawn EP0125274A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8206211A SE8206211L (sv) 1982-11-02 1982-11-02 Anordning for metning av dubbelriktade andningsfloden, utan att utoka det skadliga rummet
SE8206211 1982-11-02

Publications (1)

Publication Number Publication Date
EP0125274A1 true EP0125274A1 (fr) 1984-11-21

Family

ID=20348429

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830903599 Withdrawn EP0125274A1 (fr) 1982-11-02 1983-10-28 Agencement permettant de mesurer des flux respiratoires bidirectionnels sans accroitre l'espace mort

Country Status (3)

Country Link
EP (1) EP0125274A1 (fr)
SE (1) SE8206211L (fr)
WO (1) WO1984001704A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5170798A (en) * 1988-02-10 1992-12-15 Sherwood Medical Company Pulmonary function tester
US5058601A (en) * 1988-02-10 1991-10-22 Sherwood Medical Company Pulmonary function tester
US5137026A (en) * 1990-01-04 1992-08-11 Glaxo Australia Pty., Ltd. Personal spirometer
US5522380A (en) * 1995-01-18 1996-06-04 Dwork; Paul Metered dose medication adaptor with improved incentive spirometer
DE69931820T2 (de) * 1999-10-11 2007-06-06 Koninklijke Philips Electronics N.V. Differenzielle gasmessung, insbesondere um atemgas zu analysieren
DE102004017403B4 (de) * 2004-04-08 2010-03-25 Dräger Medical AG & Co. KG Messvorrichtung zur Messung des Volumenstromes eines Gases, dessen Strömungsrichtung sich umkehren kann
DE102011011874A1 (de) * 2011-02-21 2012-08-23 R. Cegla Gmbh & Co. Kg Therapiegerät
EP2968811B1 (fr) * 2013-03-13 2018-05-09 Teleflex Medical Incorporated Circuit respiratoire à multiples lumières comprenant un ensemble carte de circuit imprimé flexible

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2023568A (en) * 1932-05-10 1935-12-10 Walter J Albersheim Flow meter
US3921448A (en) * 1973-08-29 1975-11-25 Flo Tron Mass flowmeter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8401704A1 *

Also Published As

Publication number Publication date
WO1984001704A1 (fr) 1984-05-10
SE8206211L (sv) 1984-05-03
SE8206211D0 (sv) 1982-11-02

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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RIN1 Information on inventor provided before grant (corrected)

Inventor name: MATELL, GEORG

Inventor name: RIBBE, TOMMY

Inventor name: LINNARSSON, DAG

18D Application deemed to be withdrawn

Effective date: 19841003

RIN1 Information on inventor provided before grant (corrected)

Inventor name: MATELL, GEORG

Inventor name: RIBBE, TOMMY

Inventor name: LINNARSSON, DAG