US3460558A - Valve device,particularly for breathing apparatus - Google Patents

Valve device,particularly for breathing apparatus Download PDF

Info

Publication number
US3460558A
US3460558A US3460558DA US3460558A US 3460558 A US3460558 A US 3460558A US 3460558D A US3460558D A US 3460558DA US 3460558 A US3460558 A US 3460558A
Authority
US
United States
Prior art keywords
aperture
tube
valve
chamber
seat
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.)
Expired - Lifetime
Application number
Inventor
Dag Olof Alfred Johannisson
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.)
AGA AB
Original Assignee
AGA 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
Priority to SE694061A priority Critical patent/SE205191C1/en
Application filed by AGA AB filed Critical AGA AB
Application granted granted Critical
Publication of US3460558A publication Critical patent/US3460558A/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

Links

Images

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/20Valves specially adapted to medical respiratory devices
    • A61M16/208Non-controlled one-way valves, e.g. exhalation, check, pop-off non-rebreathing valves
    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62BDEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
    • A62B18/08Component parts for gas-masks or gas-helmets, e.g. windows, straps, speech transmitters, signal-devices
    • A62B18/10Valves
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/2496Self-proportioning or correlating systems
    • Y10T137/2544Supply and exhaust type
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/7722Line condition change responsive valves
    • Y10T137/7837Direct response valves [i.e., check valve type]
    • Y10T137/7879Resilient material valve
    • Y10T137/7888With valve member flexing about securement
    • Y10T137/7891Flap or reed

Description

8" 1219.679: b. o. A. JOHANNISSON 3,460,558

VALVE DEVICE, PARTICULARLY FOR BREATHING APPARATUS Filed Feb. 5. 1966 FIG. 2

FIG. 3

INVENTOR DAG O. A. JOHANNISSON BY oz/ csw ATTORNEY 5 United States Patent Int. Cl. F16k 7/17; A61m 16/00 US. Cl. 137-102 2 Claims ABSTRACT OF THE DISCLOSURE A valve device for use With breathing apparatus comprises a chamber having three apertures, the first of which is for connection to the patient, the second to the source of breathing gas, and the third for exhalation. The second and third apertures terminate in valve seats. A flexible closure member cooperates to open and close the second and third apertures. The closure member is constructed and positioned so as to seat in its inoperative position on the valve seat of the third aperture and is formed with a free edge portion which in the inoperative position seats on a corresponding portion of the seat of the second aperture. The closure member is easily flexible inwardly toward the chamber upon the creation of a relative subpressure therein, thereby opening the second aperture to the chamber.

This application is a continuation-in-part of my copending application Ser. No. 206,509, filed June 29, 1962, entitled Valve Device, Particularly for Breathing Apparatus, now abandoned.

This invention relates to a valve device by means of which the wearer of a breathing apparatus may be connected either to a source of breathing gas for inhalation or with the surrounding atmosphere for exhalation. The device comprises a chamber having three apertures, the first one of which is for connection to the patient, the second to the source of breathing gas, and the third for exhalation.

According to the invention the second and third apertures terminate in valve seats With which a flexible closure member cooperates to open and close the second and third apertures. The closure member preferably is constructed and positioned so as to seat in its inoperative position on the valve seat of the third aperture and is formed with a free edge portion which in the inoperative position seats on a corresponding portion of the valve seat of the second aperture and which is easily flexible inwardly toward the chamber upon the creation of a relative subpressure therein, thereby creating a free passage between the second aperture and the chamber around the free edge. There is thus an exposed portion of the flexible closure member between the portion which seats on the third aperture seat and the free edge portion which seats on the second aperture seat, and the relative chamber pressure acts upon this exposed portion to open the second aperture or the third aperture depending upon whether the chamber pressure relatively decreases or increases. By virtue of the fact that the second and third apertures are normally closed, and because of the ease with which the closure member may flex, particularly the free outer edge portion, the closure member operates in response to relatively small pressure differences or changes, and there is no danger of the third aperture being open during inhalation or the second aperture being open during exhalation.

Preferably the second and third apertures are in opposed facing relationship, and at least part of the valve seat of the second aperture lies laterally outwardly of the valve seat of the third aperture, and conveniently the valve seats may be aligned, with the second aperture seat having a greater lateral extent than the third aperture seat. Also conveniently the valve seats lie in closely adjacent substantially parallel planes so as to permit the closure member to take the form of a substantially disclike member with the freely flexing outer edge thereof normally seated on the second aperture seat.

Accordingly, it will be apparent from the foregoing summary that the general object of this invention is to provide an improved valve device for use particularly with breathing apparatus.

I have set forth with particularity in the appended claims those novel features which I consider characteristic of my invention, but the invention itself, its structure, operation, advantages and variants, will be best understood by those skilled in the art from the following description and the accompanying illustration of an exemplary and presently preferred embodiment incorporating the invention.

In the drawings:

FIGURE 1 is a schematic section through a valve device during inhalation, with the inoperative or normal position being shown in broken lines;

FIGURE 2 is a view corresponding to FIGURE 1 of the valve device during exhalation;

FIGURE 3 shows a detail of the structure of the closure member in accordance with one embodiment thereof.

In the drawings the arrows indicate how the gas flow takes place during the respective operative positions of the flexible closure member. The valve device comprises a housing 1, 2, of which one portion 1 is cylindrical and carries a tubular member 3, while the portion 2 has the form of a cover for the portion 1 and also carries a tubular member 4. The portion 1 carries furthermore a lateral tube 5. The tube 5 is the first aperture referred to previously, the tube 4 the second aperture and the tube 3 the third aperture of the chamber formed by the housing 1, 2.

Each of the tubes 3 and 4 forms a valve seat facing the chamber for a valve member 6 in the form generally of an elastic disc. The disc conveniently is attached at a portion of its circumference for cooperation with the two valve seats. A simple arrangement of this kind is obtained if a circular disc of rubber is placed as a sealing member between the two principal portions 1 and 2, and a cut is made in it along the circumference leaving a stem of suitable width, as indicated generally in FIG- URE 3.

FIGURE 1 shows the inhalation state, the normal or inoperative state being shown in broken lines at 6a. In this inoperative or normal state the closure member 6 thus beats with one of its faces against the third aperture seat and with the free edge portion on the other of its faces against the second aperture seat. Both the second and third apertures are thus closed. Breathing gas is applied through 4, for instance from an oxygen container. The valve disc then seats on the seat of tube 3, and because of the relative pressures bearing against the flexible closure member, it moves from the position shown at 6a to the position shown in full lines. That is, its borders flex and allow the breathing gas to pass as indicated by the arrows of FIGURE 1.

FIGURE 2 shows the exhalation state, during which the pressure created by the patient forces the disc 6 away from the third aperture seat and more firmly against the second aperture seat. This is so because the valve disc, even when it is seated on the tube 3, has a peripheral surface of sufiicient magnitude facing toward the chamber and which responds to an increase in pressure to force the disc 011 the third aperture seat and against the tube 4.

It is important for the disc to have its inoperative position on the seat of the tube 3 so that the patient will not be able to inhale through the tube 3. If the inoperative be able to inhale through the tube 3. If the inoperaing to FIGURE 2, such inhalation would be possible if it took place at such a small subpressure in the chamber that it would not suflice for drawing the valve member toward the seat on the tube 3. A similar situation might be possible if the aperture of tube 4 were not closed in the inoperative position. A very weak exhalation might then not create suflicient overpressure to close the aperture of tube 4, and exhaled air might conceivably leak out this way. Because the second and third apertures are normally closed, and because of the ease with which the flexible closure member, particularly the free edge portion, may flex to open these apertures, these possibilities are obviated, and the flexible closure member is fully responsive to relatively slight changes or differences in chamber pressure.

The valve device may also be used for artificial respiration if the rescuer blows air to the patient through the tube 4, the patient being connected to the tube 5. The tube 4 may then be provided with a non-return valve for inhalation, through which valve the rescuer inhales air which is then forced into the lungs of the patient when the rescuer exhales. The lungs are emptied through the tube 3 as before.

The exhalation tube 3 may be somewhat flared out- Wardly to lower the resistance to the exhalation.

The valve member 6 obviously may be an elastic disc of other material, such as plastic or possibly leather.

As an alternative, the valve disc may be completely free around its outer edge, and may be supported in the device by small prongs or projections which project into the tube 3.

The valve device may also be used for administering a liquid through the tube 3 from a container connected to the tube 5. The liquid is supplied through the tube 4 to the container, and may flow out from it by way of the tube 3 when the pressure in the aperture 4 is smaller than the pressure existing within the tube and the chamber. In this manner the valve device may be used for intravenous application of blood or other liquid.

Having thu described my invention in the manner required by the patent statutes, I claim:

1. In a breathing apparatus comprising a source of breathing gas and a valve device for connecting the breathing organs of a user to the breathing gas and for carrying off exhaled gas from the breathing organs, the improvement wherein said valve device comprises a casing forming a chamber; a first aperture for connection to the breathing organs of the user; a second aperture connected to said source of breathing gas; a third aperture for carrying off exhaled gas; said second and third apertures terminating in valve seats in said chamber;

said second and third apertures being located in substantially opposed relationship; a flexible closure member in said chamber for normally closing said third aperture by engaging said valve seat of said third aperture in the inoperative position of the closure member, and for opening said third aperture While closing said second aperture upon an increase of pressure in said chamber above the pressure from said second aperture; said closure membe comprising a thin elastic disc of impervious material having a free edge portion for controlling the second aperture.

2. In a breathing apparatus, a valve device comprising: a casing forming a chamber, a first aperture for connection to the breathing organs of the user; a second aperture for connection to a source of breathing gas; a third aperture for carrying off exhaled gas; said second and third apertures terminating in valve seats in said chamber; said second and third apertures being located in substantially opposed relationship; said casing comprising two separable parts with a sealing member interposed therebetween; said sealing member comprising an elastic member extending entirely across the chamber formed by said casing, said elastic member having a cut extending in a partially closed path lying inwardly of the part of the member which is interposed between said separable parts so as to form a partially cut-out inner portion in the form of a thin elastic disc of impervious material having a free edge portion for controlling the second aperture, and connected to the outer part of the sealing member by the uncut portion of the partially closed path; said partially cut-out inner portion comprising a flexible closure member in said chamber for normally closing said third aperture by engaging said valve seat of said third aperture in the inoperative position of the closure member, and for opening said third aperture while closing said second aperture upon an increase of pressure in said chamber above the pressure from said second aperture.

References Cited UNITED STATES PATENTS 1,412,473 4/1922 Lane 137102 1,506,012 8/1924 Lewis 137102 XR 2,533,965 12/1950 Schmohl et a1. 137-525.3 XR 3,105,488 10/1963 Richards 128-1457 3,196,890 7/1965 Brandenberg 137-102 3,285,267 11/1966 Groth l37525 XR 3,356,100 12/1967 Seeler 137-102 FOREIGN PATENTS 799,225 8/ 1958 Great Britain.

WILLIAM F. ODEA, Primary Examiner RICHARD GERARD, Assistant Examiner US. Cl. X.R. 137--525

US3460558D 1961-07-04 1966-02-03 Valve device,particularly for breathing apparatus Expired - Lifetime US3460558A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE694061A SE205191C1 (en) 1961-07-04 1961-07-04 Valve for breathing apparatus

Publications (1)

Publication Number Publication Date
US3460558A true US3460558A (en) 1969-08-12

Family

ID=20269968

Family Applications (1)

Application Number Title Priority Date Filing Date
US3460558D Expired - Lifetime US3460558A (en) 1961-07-04 1966-02-03 Valve device,particularly for breathing apparatus

Country Status (5)

Country Link
US (1) US3460558A (en)
CH (1) CH399915A (en)
DK (1) DK111181B (en)
GB (1) GB990870A (en)
SE (1) SE205191C1 (en)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3581770A (en) * 1969-05-31 1971-06-01 Fram Corp Valve
US3593732A (en) * 1969-03-12 1971-07-20 Ernest A Holscher Tee joint with flow-diverting valve
US4204555A (en) * 1978-06-12 1980-05-27 Midland-Ross Corporation Exhaust valve assembly
US4239038A (en) * 1978-03-07 1980-12-16 The Commonwealth Industrial Gases Limited Manual resuscitators
US4520811A (en) * 1981-02-08 1985-06-04 Grove Medical Supply, Inc. Pulmonary resuscitator
US4552133A (en) * 1983-08-18 1985-11-12 Kawaei Co., Ltd. Rapid exhaust valve for use in blood circulation stimulator
DE3837032A1 (en) * 1988-10-31 1990-05-03 Hansa Metallwerke Ag plants pipe interrupter for indoor plumbing, in particular for installation in a sanitaerarmatur
US5176658A (en) * 1991-05-03 1993-01-05 Sherwood Medical Company Valve assembly for use in medical devices
US5295478A (en) * 1993-02-16 1994-03-22 Baldwin Gene R Mouth-to-mask resuscitator
FR2762067A1 (en) * 1997-04-10 1998-10-16 Kawaei Co Ltd Quick Exhaust Valve has
DE19929607C1 (en) * 1999-06-28 2000-11-23 Jan Willem Marinus Myers Two-way valve comprises an additional clamping zone which is located between the outer annular clamped rim and the inner annular seating surface of the membrane disk, for use in e.g. a liquid dispenser
US6460539B1 (en) * 2000-09-21 2002-10-08 3M Innovative Properties Company Respirator that includes an integral filter element, an exhalation valve, and impactor element
US20020170563A1 (en) * 1992-05-29 2002-11-21 Japuntich Daniel A. Filtering face mask that has a new exhalation valve
WO2003004082A1 (en) * 2001-05-31 2003-01-16 Seleon Gmbh Breathing valve for cpap units, valve body and method
US7117868B1 (en) * 1992-05-29 2006-10-10 3M Innovative Properties Company Fibrous filtration face mask having a new unidirectional fluid valve
US20070119459A1 (en) * 1992-05-29 2007-05-31 3M Innovative Properties Company Method Of Making A Filtering Face Mask Having New Exhalation Valve
US20080314257A1 (en) * 2004-09-20 2008-12-25 Koninklijke Philips Electronics N.V. Beverage Making Device Comprising a Brewing Chamber and Pressure Release Means
WO2009136333A1 (en) 2008-05-07 2009-11-12 Koninklijke Philips Electronics, N.V. Exhaust assembly
CN102580220A (en) * 2011-12-28 2012-07-18 苏州凯迪泰医学科技有限公司 Leak damping valve
US20130068330A1 (en) * 2011-09-05 2013-03-21 Canon Kabushiki Kaisha Flow path switching valve and discharge control apparatus for fluid material using the same
WO2013067592A1 (en) * 2011-11-11 2013-05-16 Resmed Limited Exchanger assembly for respiratory treatment
US20160201308A1 (en) * 2015-01-13 2016-07-14 Intelligent Environmental Systems B.V. Odour trap and system of a transport conduit with a division into a main branch and a side branch and such an odour trap

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3419031A (en) * 1965-03-15 1968-12-31 Hesse Breathing valve

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1412473A (en) * 1920-08-17 1922-04-11 Westinghouse Air Brake Co Relief valve
US1506012A (en) * 1921-10-13 1924-08-26 Westinghouse Air Brake Co Quick-release valve
US2533965A (en) * 1946-12-24 1950-12-12 Parker Appliance Co Fluid pump
GB799225A (en) * 1954-01-16 1958-08-06 Chirana Praha Automatic valve for applying anaesthetics or artificial respiration
US3105488A (en) * 1959-09-17 1963-10-01 Albert M Richards Respiratory devices
US3196890A (en) * 1961-11-28 1965-07-27 Modernair Corp Double acting check valve
US3285267A (en) * 1964-03-13 1966-11-15 Westinghouse Air Brake Co Quick release valve device
US3356100A (en) * 1962-11-07 1967-12-05 Gerda A Seeler Breathing control valve and operator therefor

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1412473A (en) * 1920-08-17 1922-04-11 Westinghouse Air Brake Co Relief valve
US1506012A (en) * 1921-10-13 1924-08-26 Westinghouse Air Brake Co Quick-release valve
US2533965A (en) * 1946-12-24 1950-12-12 Parker Appliance Co Fluid pump
GB799225A (en) * 1954-01-16 1958-08-06 Chirana Praha Automatic valve for applying anaesthetics or artificial respiration
US3105488A (en) * 1959-09-17 1963-10-01 Albert M Richards Respiratory devices
US3196890A (en) * 1961-11-28 1965-07-27 Modernair Corp Double acting check valve
US3356100A (en) * 1962-11-07 1967-12-05 Gerda A Seeler Breathing control valve and operator therefor
US3285267A (en) * 1964-03-13 1966-11-15 Westinghouse Air Brake Co Quick release valve device

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3593732A (en) * 1969-03-12 1971-07-20 Ernest A Holscher Tee joint with flow-diverting valve
US3581770A (en) * 1969-05-31 1971-06-01 Fram Corp Valve
US4239038A (en) * 1978-03-07 1980-12-16 The Commonwealth Industrial Gases Limited Manual resuscitators
US4204555A (en) * 1978-06-12 1980-05-27 Midland-Ross Corporation Exhaust valve assembly
US4520811A (en) * 1981-02-08 1985-06-04 Grove Medical Supply, Inc. Pulmonary resuscitator
US4552133A (en) * 1983-08-18 1985-11-12 Kawaei Co., Ltd. Rapid exhaust valve for use in blood circulation stimulator
DE3837032A1 (en) * 1988-10-31 1990-05-03 Hansa Metallwerke Ag plants pipe interrupter for indoor plumbing, in particular for installation in a sanitaerarmatur
US5009247A (en) * 1988-10-31 1991-04-23 Hansa Metallwerke Ag Pipe interrupter
US5176658A (en) * 1991-05-03 1993-01-05 Sherwood Medical Company Valve assembly for use in medical devices
US6843248B2 (en) 1992-05-29 2005-01-18 3M Innovative Properties Company Filtering face mask that has a new exhalation valve
US7428903B1 (en) * 1992-05-29 2008-09-30 3M Innovative Properties Company Fibrous filtration face mask having a new unidirectional fluid valve
US7311104B2 (en) 1992-05-29 2007-12-25 3M Innovative Properties Company Method of making a filtering face mask that has an exhalation valve
US20070119459A1 (en) * 1992-05-29 2007-05-31 3M Innovative Properties Company Method Of Making A Filtering Face Mask Having New Exhalation Valve
US20020170563A1 (en) * 1992-05-29 2002-11-21 Japuntich Daniel A. Filtering face mask that has a new exhalation valve
US7493900B1 (en) * 1992-05-29 2009-02-24 3M Innovative Properties Company Fibrous filtration face mask having a new unidirectional fluid valve
US6854463B2 (en) * 1992-05-29 2005-02-15 3M Innovative Properties Company Filtering face mask that has a new exhalation valve
US7117868B1 (en) * 1992-05-29 2006-10-10 3M Innovative Properties Company Fibrous filtration face mask having a new unidirectional fluid valve
US5295478A (en) * 1993-02-16 1994-03-22 Baldwin Gene R Mouth-to-mask resuscitator
FR2762067A1 (en) * 1997-04-10 1998-10-16 Kawaei Co Ltd Quick Exhaust Valve has
DE19929607C1 (en) * 1999-06-28 2000-11-23 Jan Willem Marinus Myers Two-way valve comprises an additional clamping zone which is located between the outer annular clamped rim and the inner annular seating surface of the membrane disk, for use in e.g. a liquid dispenser
US6708714B1 (en) 1999-06-28 2004-03-23 Ing. Erich Pfeiffer Gmbh Two-way valve, especially for liquid dispensers
US6460539B1 (en) * 2000-09-21 2002-10-08 3M Innovative Properties Company Respirator that includes an integral filter element, an exhalation valve, and impactor element
WO2003004082A1 (en) * 2001-05-31 2003-01-16 Seleon Gmbh Breathing valve for cpap units, valve body and method
US20080314257A1 (en) * 2004-09-20 2008-12-25 Koninklijke Philips Electronics N.V. Beverage Making Device Comprising a Brewing Chamber and Pressure Release Means
US9259120B2 (en) * 2004-09-20 2016-02-16 Koninklijke Philips N.V. Brew beverage device with pressure release
US10194769B2 (en) 2004-09-20 2019-02-05 Koninklijke Philips N.V. Brew beverage device with pressure release
CN102015000A (en) * 2008-05-07 2011-04-13 皇家飞利浦电子股份有限公司 Exhaust assembly
US20110056495A1 (en) * 2008-05-07 2011-03-10 Koninklijke Philips Electronics, N.V. Exhaust assembly
US8573208B2 (en) 2008-05-07 2013-11-05 Koninklijke Philips N.V. Exhaust assembly
WO2009136333A1 (en) 2008-05-07 2009-11-12 Koninklijke Philips Electronics, N.V. Exhaust assembly
US20130068330A1 (en) * 2011-09-05 2013-03-21 Canon Kabushiki Kaisha Flow path switching valve and discharge control apparatus for fluid material using the same
US9133943B2 (en) * 2011-09-05 2015-09-15 Koganei Corporation Flow path switching valve and discharge control apparatus for fluid material using the same
WO2013067592A1 (en) * 2011-11-11 2013-05-16 Resmed Limited Exchanger assembly for respiratory treatment
AU2012334820B2 (en) * 2011-11-11 2014-12-18 ResMed Pty Ltd Exchanger assembly for respiratory treatment
CN102580220A (en) * 2011-12-28 2012-07-18 苏州凯迪泰医学科技有限公司 Leak damping valve
US20160201308A1 (en) * 2015-01-13 2016-07-14 Intelligent Environmental Systems B.V. Odour trap and system of a transport conduit with a division into a main branch and a side branch and such an odour trap
US9945107B2 (en) * 2015-01-13 2018-04-17 Intelligent Environmental Systems B.V. Odour trap and system of a transport conduit with a division into a main branch and a side branch and such an odour trap

Also Published As

Publication number Publication date
GB990870A (en) 1965-05-05
CH399915A (en) 1965-09-30
DK111181B (en) 1968-06-24
SE205191C1 (en) 1966-06-07

Similar Documents

Publication Publication Date Title
US3330274A (en) Oro-nasal face mask with improved pneumatic sealing cuff
US3537448A (en) Therapeutic intermittent positive pressure respirator
US3319627A (en) Intermittent positive pressure breathing apparatus
US3137299A (en) Tracheotomy tube
US3473529A (en) Squeeze-bag resuscitator
US3444857A (en) Compensated action nonreturn exhalation valve,more particularly for respiratory mask
US3315672A (en) Surgical mask
US3037501A (en) Quick-donning breathing mask
US3700000A (en) Valve arrangement,especially for use in anaesthetic gas supply systems
US4210155A (en) Inspirational inhalation spirometer apparatus
US5002050A (en) Medical gas flow control valve, system and method
US5297547A (en) Laryngeal mask construction
US5065756A (en) Method and apparatus for the treatment of obstructive sleep apnea
AU651882B2 (en) Aerosol inhalation device
US3905361A (en) Apparatus for sealing the esophagus and providing artificial respiration and evacuating the stomach
US7210480B2 (en) Shock treatment systems and methods
JP4598339B2 (en) Variable opening vent for breathing mask
US4469097A (en) Medical breathing apparatus
US5086768A (en) Respiratory protective device
US4870963A (en) Respiratory aid device
US5165393A (en) Deep breathing exercise apparatus
AU2003200100B2 (en) Helmet for artifical respiration without the aid of masks
US4655213A (en) Method and apparatus for the treatment of obstructive sleep apnea
US4877025A (en) Tracheostomy tube valve apparatus
US4470412A (en) Inhalation valve