EP2229099A1 - Optimisation d'un capteur de flux - Google Patents

Optimisation d'un capteur de flux

Info

Publication number
EP2229099A1
EP2229099A1 EP08845961A EP08845961A EP2229099A1 EP 2229099 A1 EP2229099 A1 EP 2229099A1 EP 08845961 A EP08845961 A EP 08845961A EP 08845961 A EP08845961 A EP 08845961A EP 2229099 A1 EP2229099 A1 EP 2229099A1
Authority
EP
European Patent Office
Prior art keywords
resistor
sensor
flow
flow direction
angle
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
EP08845961A
Other languages
German (de)
English (en)
Inventor
Andreas Albert
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.)
Individual
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
Priority to EP08845961A priority Critical patent/EP2229099A1/fr
Publication of EP2229099A1 publication Critical patent/EP2229099A1/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—Measuring devices for evaluating the respiratory organs
    • A61B5/087—Measuring breath flow
    • 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
    • G01F1/42—Orifices or nozzles
    • 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
    • A61B5/091—Measuring volume of inspired or expired gases, e.g. to determine lung capacity

Definitions

  • the invention relates to a flow sensor for measuring respiratory volume and flow rate in pulmonary function diagnostics and performance diagnostics according to the preamble of claim 1.
  • Sensors for flow measurement are used in a variety of different embodiments and methods.
  • Common measuring methods for flow measurement work, for example, according to the principle of the multiheated wire, with ultrasonic measurements or with the differential pressure measurement.
  • the test person breathes through a mouthpiece, which is connected to a flow sensor via appropriate hose connections, through which the test person breathes via the mouthpiece and the hose connection.
  • the flow rate of the exhaled air can be determined and based on the known cross sections of the flow measuring device from the respiratory volume can be calculated.
  • the invention relates to an improvement of a flow sensor for differential pressure measurement.
  • a flow resistance is introduced into the flow path.
  • the pressure drop that is, the difference between the pressure before the resistance and the pressure after the resistance.
  • This pressure drop represents a measure of the rate at which the air passes through the resistor.
  • the relationship between flow rate and pressure drop depends on the shape of the resistor. For example, in a fine mesh screen as a drag, the flow after passing through the screen remains laminar, i. There are no turbulences, and there is a linear relationship between differential pressure and flow velocity.
  • An inventive sensor has an interior, in which a surface formed resistance to the air flow is arranged.
  • This sheet resistance has an angle of its resistance plane against the flow direction, which differs from 90 degrees. Due to the arrangement of the resistor at an angle to the flow direction can be at the same a larger resistive area is used to reduce the resistance and thus the back pressure on the lung, without negatively affecting the linearity of the resistance.
  • the ratio of sensor area of the angled resistor to the vertical cross-sectional area of the flow sensor, which corresponds to the area of a conventionally arranged resistor, is a factor where alpha is the angle of the angled resistor to sin ⁇
  • the angle at which the resistance to the flow direction is arranged can vary in the range of 20 to less than 90 degrees. Angles that are shallower than 20 degrees to the flow direction do not bring significant
  • Range for the angle to the flow direction is between 30 and 80, more preferably between 40 and 50 degrees. Particularly preferably, the
  • Resistance can be arranged at an angle of 45 degrees.
  • an area of about 1200 to 2400 qmm is provided, wherein the cross-sectional area should preferably be in the range of 1600 to 200 mm2.
  • the shape of the cross section is generally relatively freely selectable, with a circular or oval cross-section is preferred. Particularly preferred is an elliptical cross section is used, in which the shorter major axis between 17 and 24 mm, preferably between 19 or 22 mm, and particularly preferably 21 mm, and a longer major axis between 22 and 32 mm, preferably between 25 and 29 mm and more preferably 28 mm long.
  • the sensor may have an angle only to one of the two main axes or to both main axes.
  • FIG. 1 a section through a flow sensor according to FIG.
  • FIG. 3 shows a flow sensor according to the invention in a cross section along the line A from FIG.
  • FIG 1 shows a flow sensor 1, as is customary in the prior art.
  • the flow sensor 1 consists of a housing 2, which is designed as a hollow profile in the manner of a tube.
  • the embodiment in Figure 1 shows a one-piece housing, multi-part housing but are also possible.
  • a flow resistance 3 is arranged, which is perpendicular in the prior art, i. is arranged at an angle 5 of 90 degrees to the flow direction 4.
  • connections for connection of the pressure measuring devices (not shown in the drawing).
  • FIG. 2 shows the flow sensor 11 according to the invention.
  • the resistor 13 is arranged, which has an angle 15 to the flow direction 14, which is smaller than 90 degrees. Even with flow sensor according to the invention are located in the flow direction 14 before and after the resistor 13 connections are not drawn to connect the pressure measuring devices, by means of which the pressure difference or the pressure drop can be measured at the flow resistance.
  • the housing 12 may also be designed in one or more parts. In a particularly preferred embodiment, the housing is integrated by injection molding with the Flow resistance produced. Depending on the requirements, a constant or variable flow resistance can be used.
  • Figure 3 shows a section through the flow sensor in Figure 2 along the line A.
  • the housing 12 has an elliptical cross-section, in which the flow resistance 13 is arranged at an angle, so that the section line A, the flow sensor 13 approximately in the Middle cuts.

Landscapes

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

Abstract

La présente invention concerne un capteur destiné à un dispositif de mesure de flux permettant d'effectuer un diagnostic de la fonction respiratoire ou un diagnostic de puissance, le capteur présentant un espace intérieur, en particulier un espace intérieur allongé dans la direction du flux, et une résistance destinée à produire une pression différentielle entre une section d'espace intérieur qui se trouve en amont de la résistance, et une section d'espace intérieur qui se trouve en aval de la résistance, la résistance consistant en un élément plat traversé par des orifices qui est disposé en formant un angle compris entre 20° et moins de 90° par rapport à la direction du flux ou par rapport à la longueur de l'espace intérieur.
EP08845961A 2007-10-31 2008-10-29 Optimisation d'un capteur de flux Ceased EP2229099A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08845961A EP2229099A1 (fr) 2007-10-31 2008-10-29 Optimisation d'un capteur de flux

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP07119713 2007-10-31
EP08845961A EP2229099A1 (fr) 2007-10-31 2008-10-29 Optimisation d'un capteur de flux
PCT/EP2008/064667 WO2009056563A1 (fr) 2007-10-31 2008-10-29 Optimisation d'un capteur de flux

Publications (1)

Publication Number Publication Date
EP2229099A1 true EP2229099A1 (fr) 2010-09-22

Family

ID=40279108

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08845961A Ceased EP2229099A1 (fr) 2007-10-31 2008-10-29 Optimisation d'un capteur de flux

Country Status (4)

Country Link
US (1) US20110046501A1 (fr)
EP (1) EP2229099A1 (fr)
DE (1) DE202008017985U1 (fr)
WO (1) WO2009056563A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2000800C3 (de) * 1970-01-09 1975-11-13 Siemens Ag, 1000 Berlin Und 8000 Muenchen MeBvorrichtung zur Erfassung des Atemstromes
DE4325789C2 (de) 1993-07-31 1997-10-30 Zan Mesgeraete Gmbh I G Verfahren zur Kalibrierung von Strömungsblenden sowie Strömungsmesser mit derartigen Strömungsblenden
WO2001042744A2 (fr) * 1999-11-30 2001-06-14 Qrs Diagnostic, Llc. Modele de spirometre a element en matiere textile place a un certain angle d'inclinaison
CA2386639A1 (fr) * 2002-05-16 2003-11-16 Dynamic Mt Gmbh Spirometre electronique portatif
CN101072981A (zh) * 2004-12-09 2007-11-14 柯尼卡美能达医疗印刷器材株式会社 流量测定装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009056563A1 *

Also Published As

Publication number Publication date
US20110046501A1 (en) 2011-02-24
DE202008017985U1 (de) 2011-02-17
WO2009056563A1 (fr) 2009-05-07

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