WO1997002070A1 - Appareil de respiration - Google Patents

Appareil de respiration Download PDF

Info

Publication number
WO1997002070A1
WO1997002070A1 PCT/SE1996/000852 SE9600852W WO9702070A1 WO 1997002070 A1 WO1997002070 A1 WO 1997002070A1 SE 9600852 W SE9600852 W SE 9600852W WO 9702070 A1 WO9702070 A1 WO 9702070A1
Authority
WO
WIPO (PCT)
Prior art keywords
breathing
hood
mask
valve
equipment according
Prior art date
Application number
PCT/SE1996/000852
Other languages
English (en)
Inventor
Pierre Bühlmann
Original Assignee
Interspiro Ab
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 Interspiro Ab filed Critical Interspiro Ab
Priority to DE69623353T priority Critical patent/DE69623353T2/de
Priority to EP96923136A priority patent/EP0956100B1/fr
Priority to AU63728/96A priority patent/AU711329B2/en
Publication of WO1997002070A1 publication Critical patent/WO1997002070A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B7/00—Respiratory apparatus
    • A62B7/12—Respiratory apparatus with fresh-air hose

Definitions

  • the present invention relates to breathing equipment of the kind which includes a breathing mask, a breathing hood or the 4 5 like, and conduit means for delivering breathing gas to the mask or hood.
  • ma ⁇ k is meant here both full face masks that are provided with a viewing visor, and so-called half masks which cover
  • breathing hood includes, among other things, so-called
  • breathing gas is 20 supplied to the space delimited by the ma ⁇ k or hood. If a fault ⁇ hould occur ⁇ o that the ⁇ upply of breathing gas ceases or becomes insufficient, for instance as a result of a mechanical fault in the equipment or because the ⁇ upply of breathing gas has been exhausted, no fresh gas will be 25 supplied to the wearer of the equipment. As a result, the carbon dioxide content of the available breathing air will build-up while the oxygen content diminishes at the same time, which can quickly lead to suffocation.
  • the main object of the present invention i ⁇ to provide breathing equipment of the afore ⁇ aid kind which in the event of a malfunction in the breathing ga ⁇ ⁇ upply will auto ati- cally open a connection between the interior of the mask or hood and the ⁇ urrounding atmo ⁇ phere so a ⁇ to enable this atmosphere to be breathed by the wearer of the ma ⁇ k or hood.
  • Thi ⁇ object i ⁇ achieved with breathing equipment of the kind which i ⁇ defined in the first paragraph and which i ⁇ charac ⁇ terized in accordance with the invention by a valve mean ⁇ which is normally closed in use and which when open connects the space delimitated by the mask or by the hood with the surrounding atmosphere, therewith to enable this atmosphere to be breathed, and by mean ⁇ for detecting when the ⁇ upply of breathing ga ⁇ to the ma ⁇ k or hood ha ⁇ fallen beneath a given level and for opening the valve means in accordance therewith.
  • valve means i ⁇ a pre ⁇ sure-controlled valve adapted to open when the pressure in the breathing gas conduit ha ⁇ fallen beneath a predetermined value.
  • the valve mean ⁇ may conveniently include a spring- biassed valve body which is pressed sealingly against a valve seat when the conduit pressure exceeds said value, but which is moved away from the seat by spring force when the pressure falls beneath said value.
  • the valve body has the form of a spring-loaded valve plate which is actuated directly by the pressure of the breathing ga ⁇ .
  • the plate is dispo ⁇ ed in a hou ⁇ ing which i ⁇ intended to be fitted over an opening in the ma ⁇ k or hood and which includes a chamber that communicates with the breathing gas conduit and whose one wall is comprised either completely or partially of said plate, which closes the opening when the pre ⁇ ure prevailing in the chamber i ⁇ ⁇ ufficient to this end.
  • Passageways are provided which connect the interior of the mask or hood with the surrounding atmosphere when the plate is moved away from the opening.
  • Fig. 1 is a schematic illustration of a so-called escape hood supplemented with an inventive arrangement
  • Fig. 2 illustrates schematically an exemplifying embodiment of the inventive arrangement.
  • Fig. 1 illustrates a so-called escape hood 1 which is con ⁇ nected to a breathing gas container (not shown) by means of a conduit 2.
  • a hood of this kind can be used temporarily, for instance, to protect against smoke and gases in an emergency, for instance in the case of fire, gas leakages from gas pipes, or in toxic gas environments created by chemicals.
  • a throttle means 14 in the conduit 2 As breathing gas flows through the conduit, a throttle means 14 in the conduit 2 generates an overpressure therein.
  • a valve means 4 is connected so as to be actuated by the gas pressure in the conduit 2.
  • the wearer breathes gas flowing from the conduit 2 into the hood 1 via an inlet 3.
  • the wearer is able to breathe the surrounding atmo ⁇ sphere when the supply of breathing gas ceases or has fallen to beneath a given value. This is a better alternative than breathing the exhalation air under any circumstance. Inhala ⁇ tion of exhalation air would quickly result in ⁇ uffocation. The danger of the surrounding atmosphere being immediately fatal is very small in many cases.
  • Fig. 2 illustrates an embodiment of an inventive valve means in more detail, wherein those components that find correspon- dence in Fig. 1 have been identified by the same reference signs.
  • Reference numeral 1 thus identifies part of the wall of a hood shown in Fig. 1.
  • the wall has provided therein an opening 6 which is held clo ⁇ ed by a valve plate 8 in normal u ⁇ e condition ⁇ .
  • the plate 8 form ⁇ one wall of a chamber 9 in a housing 10 mounted on the hood 1.
  • the chamber 9 communi ⁇ cates with the breathing gas supply conduit 2, so that the pressure in the conduit 2 will act directly on the plate 8 and a diaphragm 12.
  • the pressure in the conduit 2 may correspond to an overpressure of about 0.1-0.2 bar for instance, which is sufficient to hold the valve plate 8 in sealing abutment with the defining edges of the opening 6.
  • valve plate 8 If the pressure in the conduit 2 falls beneath a predetermined value, the valve plate 8 will be moved away from the edges of the opening 6 in re ⁇ ponse to the force exerted by a pres ⁇ ure ⁇ pring 11 mounted around the opening. Thi ⁇ movement of the plate 8 i ⁇ enabled by a flexible diaphragm 12 of the so-called roll diaphragm type fitted to the housing 10.
  • the interior of the hood 1 communicates with the surrounding atmo ⁇ phere through openings 13 in the housing 10, these openings corresponding to the outlet and inlet 7 shown in Fig. 1.
  • the wearer i ⁇ then able to breath the ⁇ urrounding atmo ⁇ phere freely.
  • the openings 13 may, of course, be provided with suitable filter means.
  • the valve means can be constructed to open at a desired pressure level in the conduit 2, by appropriate choice of the area of the valve plate 8 and the force of the spring 11.
  • the inventive arrangement can al ⁇ o be u ⁇ ed in a full face ma ⁇ k or a so-called half mask.
  • the illustrated and described embodiment has been chosen merely to describe the principle of the invention in a simple manner.
  • the design and attach ⁇ ment of the arrangement can be varied as desired within the scope of the Claims.
  • the conduit 2 can be connected to the chamber 9 so that all breathing gas will pass through the chamber before being delivered to the hood or mask.
  • valve means can also be varied in several respects while maintaining its function of control ⁇ ling the supply of breathing gas, such that the valve will automatically open the connection between the interior of the hood or the mask and the surrounding atmo ⁇ phere when nece ⁇ ary, without requiring the wearer to perform any action in this regard, which is a central characteristic feature of the inventive arrangement.
  • valve means may alternatively be mounted on the inside of the hood or mask and comprise an inwardly opening valve body.
  • the pre ⁇ ure ⁇ pring may, of course, be replaced with a pull spring when wishing to place the spring on the other side of the plate 8, for instance.
  • sensing the pre ⁇ ure in the conduit 2 it is also possible to use means which sense the flow of breathing gas and to initiate automatic opening of the valve means when the rate of flow is low or non-existent.

Landscapes

  • Health & Medical Sciences (AREA)
  • Pulmonology (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)

Abstract

L'invention porte sur un appareil de respiration comportant un masque respiratoire, une enveloppe respiratoire (1) ou analogue, et un conduit (2) alimentant le masque ou l'enveloppe en gaz respiratoire. L'appareil comporte également un clapet (4) normalement fermé et qui en position d'ouverture relie l'espace intérieur du masque ou de l'enveloppe (1) à l'atmosphère extérieure pour permettre la respiration. A cette fin des moyens de détection (8, 11) détectent lorsque l'alimentation du masque ou de l'enveloppe (1) en gaz respiratoire est descendue au-dessous d'un seuil donné ce qui provoque l'ouverture du clapet. Le clapet (4) est de préférence constitué d'un dispositif commandé par la pression qui s'ouvre lorsque la pression dans le conduit (2) de gaz respiratoire est tombée au-dessous d'une valeur prédéterminée.
PCT/SE1996/000852 1995-07-05 1996-06-27 Appareil de respiration WO1997002070A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE69623353T DE69623353T2 (de) 1995-07-05 1996-06-27 Atemausrüstung
EP96923136A EP0956100B1 (fr) 1995-07-05 1996-06-27 Appareil de respiration
AU63728/96A AU711329B2 (en) 1995-07-05 1996-06-27 A breathing equipment

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9502439-4 1995-07-05
SE9502439A SE511288C2 (sv) 1995-07-05 1995-07-05 Andningsutrustning som vid fraånfall automatiskt öppnar mot ytterluften

Publications (1)

Publication Number Publication Date
WO1997002070A1 true WO1997002070A1 (fr) 1997-01-23

Family

ID=20398858

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1996/000852 WO1997002070A1 (fr) 1995-07-05 1996-06-27 Appareil de respiration

Country Status (6)

Country Link
EP (1) EP0956100B1 (fr)
AU (1) AU711329B2 (fr)
CA (1) CA2226099A1 (fr)
DE (1) DE69623353T2 (fr)
SE (1) SE511288C2 (fr)
WO (1) WO1997002070A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106955431A (zh) * 2017-05-29 2017-07-18 东台市江海救生消防设备有限公司 紧急逃生呼吸器
US10758213B2 (en) 2015-01-13 2020-09-01 Covidien Lp Exchangeable core biopsy needle

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR796977A (fr) * 1935-10-22 1936-04-18 Perfectionnements aux appareils de protection contre les gaz
DE913260C (de) * 1941-09-04 1954-06-10 Draegerwerk Ag Rueckzugssignalvorrichtung fuer Sauerstoff- und Pressluftatemschutzgeraete

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5385141A (en) * 1992-04-16 1995-01-31 Siebe North, Inc. Speech diaphragm and exhalation valve
GB9226054D0 (en) * 1992-12-14 1993-02-10 Middlemace Ltd Flow indicator
SE504000C2 (sv) * 1995-02-20 1996-10-14 Comasec International Sa Ansiktsmask för andning av gas från förråd eller den omgivande atmosfären

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR796977A (fr) * 1935-10-22 1936-04-18 Perfectionnements aux appareils de protection contre les gaz
DE913260C (de) * 1941-09-04 1954-06-10 Draegerwerk Ag Rueckzugssignalvorrichtung fuer Sauerstoff- und Pressluftatemschutzgeraete

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10758213B2 (en) 2015-01-13 2020-09-01 Covidien Lp Exchangeable core biopsy needle
CN106955431A (zh) * 2017-05-29 2017-07-18 东台市江海救生消防设备有限公司 紧急逃生呼吸器

Also Published As

Publication number Publication date
SE9502439L (sv) 1997-01-06
EP0956100A1 (fr) 1999-11-17
AU711329B2 (en) 1999-10-14
SE9502439D0 (sv) 1995-07-05
DE69623353D1 (de) 2002-10-02
CA2226099A1 (fr) 1997-01-23
EP0956100B1 (fr) 2002-08-28
SE511288C2 (sv) 1999-09-06
DE69623353T2 (de) 2003-04-17
AU6372896A (en) 1997-02-05

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