EP1565711A1 - Debitmetre pour gaz - Google Patents

Debitmetre pour gaz

Info

Publication number
EP1565711A1
EP1565711A1 EP03758389A EP03758389A EP1565711A1 EP 1565711 A1 EP1565711 A1 EP 1565711A1 EP 03758389 A EP03758389 A EP 03758389A EP 03758389 A EP03758389 A EP 03758389A EP 1565711 A1 EP1565711 A1 EP 1565711A1
Authority
EP
European Patent Office
Prior art keywords
gas channel
sensors
gas
measured values
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.)
Ceased
Application number
EP03758389A
Other languages
German (de)
English (en)
Inventor
Harri Friberg
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.)
IMT Medical AG
Original Assignee
IMT Medical AG
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 IMT Medical AG filed Critical IMT Medical AG
Publication of EP1565711A1 publication Critical patent/EP1565711A1/fr
Ceased 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
    • A61B5/087—Measuring breath flow
    • 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
    • A61B5/097—Devices for facilitating collection of breath or for directing breath into or through measuring devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/40—Details of construction of the flow constriction devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/50—Correcting or compensating means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/02—Compensating or correcting for variations in pressure, density or temperature
    • G01F15/04—Compensating or correcting for variations in pressure, density or temperature of gases to be measured
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/02—Compensating or correcting for variations in pressure, density or temperature
    • G01F15/04—Compensating or correcting for variations in pressure, density or temperature of gases to be measured
    • G01F15/043—Compensating or correcting for variations in pressure, density or temperature of gases to be measured using electrical means
    • G01F15/046—Compensating or correcting for variations in pressure, density or temperature of gases to be measured using electrical means involving digital counting

Definitions

  • Measurements are influenced by the environmental conditions and incorrect calibrations occur. This is particularly problematic with medical devices such as ventilators or anesthesia devices. Since the devices are used worldwide, incorrect calibrations also result from incorrect operation of the devices.
  • Ultrasound 2 combined ultrasound transmitter-receiver units, which are arranged at an angle to the flow direction. These send an ultrasound pulse at regular intervals and wait for the pulse from the other transmitter to be received. If ultrasonic waves traverse a defined distance s in a known medium, they require a time t that depends on their propagation speed.
  • the speed of propagation of a wave is therefore dependent on the transit time of the signal from one transmitter / receiver to another.
  • An impeller is rotated in such a way that its speed is proportional to the mean flow velocity.
  • the medium flows through a nozzle or orifice.
  • the cross section is narrowed, which speeds up the flow rate.
  • Venturi nozzles are mostly used to avoid vortex formation.
  • the mass flow is then calculated from the pressure difference across the nozzle.
  • the laminar flow elements are based on the fact that the flow can be calculated from a pressure difference. In contrast to these, however, the flow is linear to the measured differential pressure. In medicine, the laminar flow elements are known as pneumotachographs.
  • a wire or surface is heated to a temperature that is above ambient. Molecules that hit this surface and then fly on again absorb kinetic energy there.
  • the heat loss of the heated area is proportional to the temperature difference between the heated area and the environment and to the number of molecules hitting per unit of time
  • the measuring properties of the individual methods are different and depending on the application, one or the other measuring device - possibly optimized - is used.
  • Ventilation devices such as Ventilation devices, anesthetic devices, etc.
  • a certain degree of accuracy of the measurement e.g. for calibration or control purposes - had to be satisfied.
  • the invention thus relates to a device for exact flow measurement of gases regardless of the ambient conditions such as temperature, humidity, Type of gas, oxygen concentration and the ambient pressure. In doing so, as few compromises as possible should be made and a multitude of different applications can be measured with high precision. Furthermore, the operation should be as simple as possible to avoid incorrect manipulation. The measurement should be able to be carried out with the same degree of accuracy in any environmental conditions.
  • the measuring device represents a device (1) for measuring gases with a gas channel (3), with a sieve (4) and with several different sensors (5), (6), (7), (8), (9), (10), wherein in the gas channel (3) through which the gas stream to be measured flows, a plurality of sensors (5-10) are installed, which can measure both moist and dry gases exactly, all sensors with are connected to a computer which compares the individual measured values of the individual sensors with one another and comprises a program with which a consolidated measured value for the gas actually flowing through can be specified from the various measured values. Certain sensors are used to record the environmental conditions.
  • the calculation of the gas flow in the computer e.g. a microcontroller (11) the environmental influences of humidity, absolute pressure, temperature and
  • Oxygen concentration is taken into account, so that the measurement is always accurate in all environmental conditions.
  • the gas channel (3) is designed as a compact block in which all sensors are directly integrated.
  • the use of hoses between the sensors is avoided according to the invention.
  • the gas channel (3) and the sieve (4) are constructed in such a way that a laminar gas flow results regardless of the direction of flow and that a bi-directional gas measurement is thus possible as a special feature.
  • a laminar gas flow results regardless of the direction of flow and that a bi-directional gas measurement is thus possible as a special feature.
  • a DAK button (“DAK” means Direct Access Knob) for direct access to help and measured values is arranged on the front plate of the device next to the gas channel (3), which is connected to a display via the computer and This display allows the immediate display of current measured values or help functions.
  • DAK Direct Access Knob
  • the invention is not restricted to certain sensors or sensor types. Rather, the person skilled in the art can use the known sensor types e.g. Select according to the introduction to the description.
  • Figure 1 shows the device for gas flow measurement.
  • the gas flow 2 flows through the gas channel 3 and through the sieve 4 that is mounted in the middle of the gas channel 3.
  • the screen is easy to replace and, like the other components, is only shown symbolically.
  • the gas channel 3 is designed such that a laminar flow of the gas flowing through results.
  • a large number of sensors 5-10 with different ones are located in the gas channel Measuring tasks and / or different measuring ranges.
  • a microcontroller 11 which is not shown in detail, processes the different measured values in order to be able to determine a flow measurement value which is as exact as possible for the respective application under the respective ambient conditions.
  • the sensor values of the sensors 5-10 are thus read in by the microcontroller 11, which is preferably provided as a module, and converted into an exact gas flow.
  • FIG. 4 shows a preferred overall construction of the device according to the invention.

Landscapes

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

Abstract

L'invention concerne un dispositif de mesure de gaz précise comprenant plusieurs capteurs évalués par l'intermédiaire d'un microcontrôleur, de sorte qu'une haute précision de mesure est fournie indépendamment des conditions ambiantes également mesurées.
EP03758389A 2002-11-20 2003-10-22 Debitmetre pour gaz Ceased EP1565711A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH02010/02A CH712588B1 (de) 2002-11-20 2002-11-20 Gasflussmessgerät.
CH201002 2002-11-20
PCT/IB2003/004653 WO2004046661A1 (fr) 2002-11-20 2003-10-22 Debitmetre pour gaz

Publications (1)

Publication Number Publication Date
EP1565711A1 true EP1565711A1 (fr) 2005-08-24

Family

ID=32315198

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03758389A Ceased EP1565711A1 (fr) 2002-11-20 2003-10-22 Debitmetre pour gaz

Country Status (6)

Country Link
US (1) US7212937B2 (fr)
EP (1) EP1565711A1 (fr)
JP (1) JP2006506636A (fr)
AU (1) AU2003274408A1 (fr)
CH (1) CH712588B1 (fr)
WO (1) WO2004046661A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH704346B1 (de) * 2007-02-05 2012-07-13 Imtmedical Ag Steuerventil für Beatmungsgeräte.
WO2009143447A1 (fr) * 2008-05-23 2009-11-26 Rosemount, Inc. Dispositif de circulation de fluide de process multi-variable avec calcul de flux d’énergie
EP2817518B1 (fr) 2012-02-02 2020-05-20 imtmedical ag Boîtier isolant pour un appareil respiratoire
US9541098B2 (en) 2013-06-28 2017-01-10 Vyaire Medical Capital Llc Low-noise blower
US9962514B2 (en) 2013-06-28 2018-05-08 Vyaire Medical Capital Llc Ventilator flow valve
US9746359B2 (en) 2013-06-28 2017-08-29 Vyaire Medical Capital Llc Flow sensor
US9433743B2 (en) 2013-06-28 2016-09-06 Carefusion 303, Inc. Ventilator exhalation flow valve
US9795757B2 (en) 2013-06-28 2017-10-24 Vyaire Medical Capital Llc Fluid inlet adapter
US9707369B2 (en) 2013-06-28 2017-07-18 Vyaire Medical Capital Llc Modular flow cassette
KR101905067B1 (ko) * 2016-11-29 2018-10-05 한국기계연구원 단일 호흡기체의 분석방법과 분석장치
US10861692B2 (en) * 2017-10-26 2020-12-08 Taiwan Semiconductor Manufacturing Co., Ltd. Substrate carrier deterioration detection and repair
US11896940B2 (en) 2018-07-31 2024-02-13 Halliburton Energy Services, Inc. Volumetric control for proppant concentration in hydraulic fracturing

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JPH0210421Y2 (fr) * 1984-12-24 1990-03-15
JPS61164117A (ja) * 1985-01-16 1986-07-24 Yokogawa Electric Corp 気体流量測定装置
US4704233A (en) * 1986-11-10 1987-11-03 The Procter & Gamble Company Detergent compositions containing ethylenediamine-N,N'-disuccinic acid
US5179958A (en) * 1988-06-29 1993-01-19 Mault James R Respiratory calorimeter with bidirectional flow monitor
US5205955A (en) * 1991-07-03 1993-04-27 Kiwi Brands, Inc. Lavatory cleansing and sanitizing blocks containing a halogen release bleach and a mineral oil stabilizer
JPH0951950A (ja) * 1995-08-11 1997-02-25 Nikkiso Y S I Kk 人工呼吸装置およびセンサーモジュール
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JP3989629B2 (ja) * 1998-07-21 2007-10-10 株式会社コスモ計器 流量検査装置
CN1271047A (zh) * 1999-04-19 2000-10-25 莎拉李/迪有限公司 悬垂于抽水马桶边缘的净化和清新设备
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EP1229833B1 (fr) 1999-11-16 2006-06-21 Cortex Biophysik GmbH Systeme ergospirometrique pour animaux, notamment pour chevaux ou chameaux
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Also Published As

Publication number Publication date
AU2003274408A1 (en) 2004-06-15
US7212937B2 (en) 2007-05-01
CH712588B1 (de) 2017-12-29
US20060144163A1 (en) 2006-07-06
JP2006506636A (ja) 2006-02-23
WO2004046661A1 (fr) 2004-06-03

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