WO2007132206A1 - Indicateur de débit gazeux - Google Patents

Indicateur de débit gazeux Download PDF

Info

Publication number
WO2007132206A1
WO2007132206A1 PCT/GB2007/001744 GB2007001744W WO2007132206A1 WO 2007132206 A1 WO2007132206 A1 WO 2007132206A1 GB 2007001744 W GB2007001744 W GB 2007001744W WO 2007132206 A1 WO2007132206 A1 WO 2007132206A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas flow
rotor
flow rate
gas
rate indicator
Prior art date
Application number
PCT/GB2007/001744
Other languages
English (en)
Inventor
David Edgar Peel
Richard Radford
Original Assignee
Bpr Mecical Ltd
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 Bpr Mecical Ltd filed Critical Bpr Mecical Ltd
Publication of WO2007132206A1 publication Critical patent/WO2007132206A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P13/00—Indicating or recording presence, absence, or direction, of movement
    • G01P13/0006—Indicating or recording presence, absence, or direction, of movement of fluids or of granulous or powder-like substances
    • G01P13/004—Indicating or recording presence, absence, or direction, of movement of fluids or of granulous or powder-like substances by using the rotation of vanes
    • 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
    • G01F1/053—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 using rotating vanes with tangential and axial admission
    • 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
    • G01F1/10—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 using rotating vanes with axial admission
    • G01F1/103—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 using rotating vanes with axial admission with radiation as transfer means to the indicating device, e.g. light transmission
    • 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
    • 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
    • A61B5/09—Measuring breath flow using an element rotated by the flow

Definitions

  • This invention is concerned with improvements in or relating to gas flow indicators and is specifically concerned with such indicators capable of indicating that not only is there gas flow but that the gas is flowing at an acceptable or desired rate of flow; this is particularly useful for monitoring the rate of flow of oxygen in apparatus for providing respiratory assistance to a patient, whether in the home or in a hospital, for example as part of a respiratory device provided for a patient to assist with breathing, or as an emergency device which may be used by emergency services such as ambulance and air/sea rescue crews.
  • the present invention finds particular utility in connection with respiratory devices, and will hereinafter be described with particular reference to this application without, however, thereby introducing any limitation to the scope of invention as defined in the following claims.
  • Oxygen supply apparatus is frequently provided for the purpose of assisting those with respiratory ailments including, for example, lung disorders, so that patients can administer oxygen themselves in the home environment.
  • Such apparatus is usually of a portable nature.
  • Oxygen may be supplied in one of three ways, namely in compressed form in cylinders, from concentrators which extract oxygen from the atmosphere or as liquid oxygen in a Dewar Flask. Such sources are coupled typically via a line to a face mask.
  • control regulators There are two main types of control regulators currently in use for regulating the rate of flow of oxygen in therapeutic respirators, namely the needle-valve regulator, which comprises an orifice or passage into which penetrates a tapered needle the position of which determines the effective flow cross section of the orifice and thus the rate of flow.
  • the needle may project transversely into the lumen or may lie substantially parallel to the direction of gas flow.
  • Such devices can have associated with them a flow rate indictor of the type comprising a tapered and calibrated transparent tube (typically methyl methacrylate, commonly called perspex) housing a ball which, in use, 'floats' in a rising gas stream within the tube, the height of the ball in the tube indicating the rate of flow of the gas.
  • the flow rate indication is corrupted or even lost if the tube is not positioned exactly vertically, and the build up of static electricity on the Perspex tubes can cause the ball to adhere to the side wall and thus corrupt the flow rate indication.
  • the other type of flow regulator in common use is the so-called fixed-orifice flow regulator having a number of different calibrated holes in a plate which can be turned to position a selected hole in the part of the gas stream to select a discrete flow rate.
  • Such part of the devices provide an indirect indication of the flow rate by the position of the plate, but this does not confirm that gas is actually flowing. It is important both for self-administration and for third party administration of oxygen to be certain that the gas is actually flowing and monitoring of the rate of flow of oxygen to the patient to ascertain that an acceptable flow rate is being delivered. There is, for example, the possibility that flow of oxygen to a patient may be disrupted due to a fault in the supply line between the oxygen source and the face mask.
  • the present invention provides a gas flow rate indicator comprising a container having an inlet and an outlet, the container providing internally a passage through which gas under pressure can be directed from the inlet to the outlet, and the container further having indicator means within the passage responsive to the flow of gas therethrough, the container having a viewing port through which response of said indicator means to the flow of gas therethrough can be observed.
  • the indicator means comprises a rotor mounted so as to be free to rotate within the container.
  • This rotor may comprise a central hub mounted on a rotatable spindle supported by bearings, with the rotor having one or more vanes or blades arranged in spaced circumferential relationship with respect to an axis of the spindle.
  • the rotor may comprise a central hub mounted on a rotatable spindle as referred to above with the rotor further comprising one or more vanes or blades each of arcuate cross-section when viewed in the direction of the axis of rotation of the spindle and mounted on the hub for rotation about the axis of the spindle when gas flows through the container.
  • the vanes or blades may be of helical form, and indeed, may be in the form of a single helical vane.
  • the indicator means may comprise a rotor mounted in 'frictionless' magnetic bearings wherein the rotor includes a magnetised element which is polarised to float between corresponding magnetically polarised members located upstream and downstream relative to the flow of gas to maintain the rotor in the passage, the rotor further comprising a plurality of vanes or blades as in the preceding embodiments.
  • At least one part of at least one vane or blade of the rotor visually discernible, for example at least partially coloured, so that the rate of rotation of the rotor can be observed and judged by the rate at which the colour changes traverse the window.
  • the spindle is aligned with the direction of flow of gas through the container.
  • the rotor may be mounted for rotation about an axis which is transverse to the flow of gas through the container.
  • the means responsive to gas flow may comprise a piezoelectric element mounted within the passage of the container, this element then being arranged to sense change in pressure due to change in flow of gas through the passage, hi such an arrangement the element will then be coupled electrically to a visual indicator mounted in or on the body of the container and arranged to indicate when a correct flow of gas occurs.
  • Figure 1 is a side view of a gas flow rate indicator according to a preferred embodiment of the present invention.
  • FIG 2 is a further side view of the gas flow rate indicator shown in Figure 1;
  • FIGS. 3 to 5 are perspective views of a rotor unit for use in an indicator according to the invention.
  • the gas flow rate indicator illustrated in the accompanying drawings is intended for use in conjunction with an oxygen supply designed for use by a patient whether in the home, in hospital or by deployment by emergency services such as ambulance crews or air/sea rescue teams.
  • a supply will typically comprise an oxygen source such as an oxygen cylinder or concentrator which provides a supply of oxygen which can be typically admixed with an air supply to enrich the oxygen content thereof, the gas supply being regulated and supplied to an oxygen mask or the like.
  • the gas flow indicator illustrated in the Figures comprises a container 10, having an inlet 12 and an outlet 14.
  • the container 10 is a hollow receptacle providing a chamber which defines a passage through which gas under pressure, usually oxygen-enriched air, can be directed from the inlet to the outlet.
  • the container has at least one viewing port or window 15 through which the interior of the container can be viewed by an observer.
  • a rotor 16 that rotates in response to flow of gas through the container for providing visual indication of that flow.
  • the rotor 16 shown more clearly in Figures 3 to 5, is mounted on a spindle 18 within the container in a position such that it can be viewed through the viewing window 15.
  • the spindle is supported in a housing 20 that is fitted within the container so that the axis of rotation of the spindle is aligned with flow of gas through the container.
  • the means may comprise upper and lower spider supports which provide low-friction bearings that support the spindle.
  • the rotor 16 comprises a hub 21 from which extend vanes providing rotor blades 22.
  • the vanes 22 are integral with the hub 21, and extend outwardly from the spindle axis.
  • Each vane or blade is of a substantially arcuate cross section when viewed in a direction along the axis of the spindle.
  • Each vane or blade is joined to the hub along a line that is itself curved along the length of the spindle such that the outermost edge of each vane or blade is of helical shape.
  • the vanes or blades 22 are arranged in spaced circumferential relationship to each other and extend outwardly of the spindle, hi an alternative embodiment, the vanes or blades may extend radially with respect to the spindle axis.
  • the blades 22 may be at least partially coloured in any manner such that rotation of the rotor 16 can be readily seen.
  • the colouring of the blades may ideally be by provision of stripes so that not only can rotation of the rotor be observed but also the rate of rotation. Such stripes can be provided by colour being applied to the outermost edges of the blades.
  • the hub of the rotor may be formed as or include a magnetic element, the hub being mounted between support members which are also magnetic so that the hub 'floats' in the magnetic field provided by the support members. The magnetic element can thus float in balance in a virtually frictionless arrangement.
  • the means which is arranged and provided to give indication that gas is flowing through the container to a patient can be provided by a piezoelectric device provided within the container and associated with a light source that can be powered from the device to provide a visual indication of flow through the container.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

La présente invention concerne un indicateur de débit gazeux comprenant un récipient (10) comportant une admission (12) et une évacuation (14). Le récipient présente un passage interne par lequel un gaz sous pression peut circuler depuis l'admission (12) vers l'évacuation (14). Il comporte également des moyens indicateurs (16) à l'intérieur du passage qui sont sensibles au débit du gaz passant par le passage. Le récipient comporte un orifice de visualisation (15) par lequel la réponse des moyens indicateurs (16) au débit gazeux peut être observée.
PCT/GB2007/001744 2006-05-12 2007-05-11 Indicateur de débit gazeux WO2007132206A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0609405.6 2006-05-12
GB0609405A GB0609405D0 (en) 2006-05-12 2006-05-12 Gas flow indicator

Publications (1)

Publication Number Publication Date
WO2007132206A1 true WO2007132206A1 (fr) 2007-11-22

Family

ID=36637357

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2007/001744 WO2007132206A1 (fr) 2006-05-12 2007-05-11 Indicateur de débit gazeux

Country Status (2)

Country Link
GB (2) GB0609405D0 (fr)
WO (1) WO2007132206A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9773393B2 (en) 2015-10-07 2017-09-26 Michael D. Velez Flow alarm
USD887549S1 (en) 2018-09-10 2020-06-16 Masino Corporation Cap for a flow alarm device
USD887548S1 (en) 2018-09-10 2020-06-16 Masimo Corporation Flow alarm device housing

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3097297A1 (fr) * 2019-06-17 2020-12-18 Air Liquide Medical Systems Ensemble de distribution de gaz comprenant un détendeur de gaz et un dispositif de visualisation du débit de gaz
KR102054115B1 (ko) * 2019-08-09 2019-12-09 조시온 환자의 호흡 여부를 확인할 수 있는 기도삽관 어셈블리

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US729660A (en) * 1897-11-26 1903-06-02 Niels Poulson Device for illuminating rooms opening on light-wells.
GB2220485A (en) * 1988-04-25 1990-01-10 Pennwalt Piezo Film Gas flow detector
US5343763A (en) * 1992-06-15 1994-09-06 Racine Federated Inc. Flow indicator impeller module
EP1096144A2 (fr) * 1999-11-01 2001-05-02 Masaharu Miyake Eolienne
US6386196B1 (en) * 2000-03-13 2002-05-14 Steven E. Culton Warning device for oxygen delivery system failure
US20050011282A1 (en) * 2003-06-06 2005-01-20 Voege James A. Lighted fluid flow indication apparatus

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB765847A (en) * 1953-08-25 1957-01-16 Arthur Cyril Rhodes Improvements in or relating to sight flow indicators
US4745877A (en) * 1987-01-12 1988-05-24 Chang Shih Chih Rotary sight flow indicator
US4793190A (en) * 1987-07-23 1988-12-27 Chang Shih Chih Device for measuring and indicating flow around a bend
JP3430112B2 (ja) * 2000-03-16 2003-07-28 ワシノ機器株式会社 フラッパー式サイトグラス
US7159533B1 (en) * 2002-09-12 2007-01-09 Iris Gail Redd System and method for monitoring the delivery of gas to a person's airway

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US729660A (en) * 1897-11-26 1903-06-02 Niels Poulson Device for illuminating rooms opening on light-wells.
GB2220485A (en) * 1988-04-25 1990-01-10 Pennwalt Piezo Film Gas flow detector
US5343763A (en) * 1992-06-15 1994-09-06 Racine Federated Inc. Flow indicator impeller module
EP1096144A2 (fr) * 1999-11-01 2001-05-02 Masaharu Miyake Eolienne
US6386196B1 (en) * 2000-03-13 2002-05-14 Steven E. Culton Warning device for oxygen delivery system failure
US20050011282A1 (en) * 2003-06-06 2005-01-20 Voege James A. Lighted fluid flow indication apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9773393B2 (en) 2015-10-07 2017-09-26 Michael D. Velez Flow alarm
USD887549S1 (en) 2018-09-10 2020-06-16 Masino Corporation Cap for a flow alarm device
USD887548S1 (en) 2018-09-10 2020-06-16 Masimo Corporation Flow alarm device housing
USD908213S1 (en) 2018-09-10 2021-01-19 Masimo Corporation Wingnut for a flow alarm device
USD917046S1 (en) 2018-09-10 2021-04-20 Masimo Corporation Cap for a flow alarm device

Also Published As

Publication number Publication date
GB0609405D0 (en) 2006-06-21
GB2438086A (en) 2007-11-14
GB0709095D0 (en) 2007-06-20

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