US3662774A - Gas evacuator for breathing apparatus - Google Patents

Gas evacuator for breathing apparatus Download PDF

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Publication number
US3662774A
US3662774A US68364A US3662774DA US3662774A US 3662774 A US3662774 A US 3662774A US 68364 A US68364 A US 68364A US 3662774D A US3662774D A US 3662774DA US 3662774 A US3662774 A US 3662774A
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US
United States
Prior art keywords
gas
chamber
duct
pressure
conduit
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
US68364A
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English (en)
Inventor
Dag Olof Alfred Johannisson
Gustaf Silas Staffan Lundberg
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.)
Siemens AG
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
Application filed by AGA AB filed Critical AGA AB
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Publication of US3662774A publication Critical patent/US3662774A/en
Assigned to SIEMENS A.G., VBA PA PB, POSTFACH 22 0261, D-8000 MUNICH 22, reassignment SIEMENS A.G., VBA PA PB, POSTFACH 22 0261, D-8000 MUNICH 22, ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AGA AKTIEBOLAG,
Assigned to SIEMENS A.G. reassignment SIEMENS A.G. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AGA AKTIEBOLAG
Assigned to AGA AKTIEBOLAG reassignment AGA AKTIEBOLAG RERECORD OF INSTRUMENT RECORDED APRIL 19 83 REEL 417 REAMES 218 TO CORRECT ADDRESS OF ASSIGNEE IN A PREVIOUSLY RECORDED ASSIGMENT Assignors: AGA AKTIEBOLAG
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0087—Environmental safety or protection means, e.g. preventing explosion
    • A61M16/009—Removing used or expired gases or anaesthetic vapours
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S128/00—Surgery
    • Y10S128/91—Anesthesia gas scavenging system
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/2574—Bypass or relief controlled by main line fluid condition
    • Y10T137/2605—Pressure responsive
    • Y10T137/2642—Sensor rigid with valve
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7838—Plural
    • Y10T137/7842—Diverse types
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87917—Flow path with serial valves and/or closures

Definitions

  • a gas evacuator for removing excess gas conveyed to a patient through a duct from a gas supply includes a conduit connectable to the gas duct to convey the gas from one portion of the duct to another portion thereof.
  • a chamber is provided with a drain line connectable to a low pressure source, such as a vacuum pump, for maintaining a reduced pressure in the chamber.
  • a first valve is provided for venting excess gas from said conduit to said chamber in response to the differential pressure therebetween.
  • a second valve is provided to introduce gas to said chamber from atmosphere in response to pressure in the chamber. The chamber is kept under low pressure by the vacuum pump.
  • the second valve opens to maintain that pressure in the chamber. If excess gas is present in the duct, the first valve opens venting that excess gas to the chamber until the excess gas is removed. Thevented gas is removed through the drain line. In the event of a temporary increase in pressure in the chamber above the mentioned desired value, the second valve closes thus ensuring that the excess gas removed from the duct is not vented to atmosphere in the area adjacent the device.
  • the present invention relates to apparatus for removing excess gas from a duct in which the gas is flowing. More particularly, the invention relates to a breathing apparatus suchas a narcosis apparatus. Still more particularly, the invention relates to such apparatus wherein gas from a gas supply source is conveyed to a patient through a gas duct.
  • gas is introduced to a patient through a conduit from a gas supply source.
  • the patient intermittently breathes the gas and, accordingly, the gas pressure in the gas duct will vary.
  • the gas issupplied at a rate to permit free breathing. This usually results in temporary overpressures in the gas conduit and, in thepast, this excess gas has been permitted to leak out in the room in the vicinity of the breathing apparatus.
  • narcotics are added to the gas, the said leakage causes considerable trouble to personnel present in the room.
  • gas evacuating apparatus for removing excess gas from a duct in which said gas is flowing comprising: a conduit connectable to said duct to convey said gas from one portion of said duct to another portion thereof; a chamber; a drain line from said chamber connecta ble to a low pressure source for maintaining a reduced pressure in said chamber; first valve means responsive to differential pressure between said conduit and said chamber for venting excess gas from said conduit to said chamber; second valve means responsive to pressure in said chamber for introducing gas from atmosphere into said chamber to maintain a desired pressure therein.
  • FIG. 1 is a diagrammatic view, partially in section, of a gas evacuating apparatus according to the presentinvention.
  • FIG. 2 is a diagrammatic elevation of an alternative device according to the present invention.-
  • a gas breathing apparatus comprises a gas supply source 1, and a gasduct indicated generally as arrows 2 and 3'for conveying gas from the gas supply source to a patient.
  • Gas breathing devices of this type are conventional and a typical example is described in Swedish Pat. No. 212,054.
  • FIG. 1 illustrates a gas evacuating apparatus '10 for removing excess gas from duct 2, 3 in which the gas is flowing.
  • the device comprises a housing 11 in which is provided a conduit 12 connectable to duct 2, 3 to convey gas from portion 2 of the duct to portion 3 of the duct. Housing 11 also defines a chamber 13.
  • the chamber 13 is provided with a drain line connected to a low pressure source 15 by a suitable conduit indicated generally as arrow 16 for maintaining a reduced pressure in the chamber.
  • the chamber includes a first valve 17 for venting any excess gas from said conduit to said chamber in response to differential pressure between said conduit and said chamber.
  • Valve 17 comprises a valve stem l8carrying valve disc 19 which seats on valve seat 20.
  • the opposite end of stem 18 is provided with a disc 21.
  • Disc 2l is arranged in a recess 22 formed in a member 23 which is threaded into housing 11.
  • a spring 24 acting betweenthe bottom of recess 22 and disc 21 biases the valve disc 19 against valve seat 20 thus closing passageway 25 between conduit 12 and chamber 13.
  • Member 10 is adjustably located in housing 11 by means of screw threads to adjust the compression of spring 24.
  • a second valve 26 is provided for introducing gas from the atmosphere into the chamber in response to pressure therein.
  • the valve includes a valve disc 27'seating on valve seat 28'under the influence of spring 29.
  • the valve may include a conventional valve stem of the like not shown for purposes of simplicity.
  • the device also includes a reservoir 30 in gas communication with chamber 13.
  • a reservoir in gas communication with chamber 13
  • the device By providing the device with a reservoir which is in gas communication with the chamber and the drain line 14, it is possible to compensate for any gas volumes which may be introduced into chamber 13 and which cannot immediately be removed by the suction in the evacuating line due to the limited capacity of the vacuum pump. It is altematively possible to provide the device with a large volume such that a reservoir is not required. However, the large dimensions of a device of this type involve several disadvantages such as increased cost and excessive noise. Accordingly, it is preferred to provide a reservoir member such as member 30.
  • the reservoir may be a closed member in the form of a flexible bag 31 made of rubber of the like.
  • the reservoir may comprise an elongated tube of considerable length having one end in gas communication with the chamber 13 and having the other end remote from the gas chamber open as described in Swedish Pat. No. 302,660.
  • Low pressure source 15 such as a vacuum pump
  • Spring member 29 is adjusted such that valve 26 will open in the eve'ntthat pressure in chamber 13 is reduced below this desired value.
  • Spring member 24 is adjusted such that valve 17 will open in the event that the differential pressure between chamber 13 and conduit 12 exceeds a certain desired value.
  • the drain line 14 is provided with an evacuating line 16 and a suction valve 26 for the compensation of low pressure in the drain line and in chamber 13.
  • the equipment thus operates with a certain underpressure or suction in the evacuating line which is vented in an area remote from the breathing apparatus and from the patient.
  • the underpressure in the drain line must not become too low since,in
  • valve 17 would open and the breathing gas would be removed from the breathing apparatus.
  • the device has therefore been provided with suction valve 26 which compensates for any such underpressure in chamber 13.
  • valve 17 is replaced by valve 32 comprising a diaphragm 33 biased against a valve seat 34 by means of spring 35 the compression of which is adjustable by means of member 36 threadably secured in housing 11.
  • the gas conduit 37 described a tortuous path through the housing defined by openings 38, 39 therein connected by an annular passage 40 defined by diaphragm 33.
  • Gas evacuating apparatus for removing excess gas from a duct in which said gas is flowing comprising: a conduit connectable to said duct to convey said gas from one portion of said duct to another portion thereof; a chamber; a drain line from said chamber connectable to a low pressure source for maintaining a reduced pressure in said chamber; first valve means responsive to differential pressure between said conduit and said chamber for venting excess gas from said conduit to said chamber; second valve means responsive to pressure in said chamber for introducing gas from atmosphere into said chamber to maintain a desired pressure therein.
  • Apparatus according to claim 1 including a gas reservoir in gas communication with said chamber.
  • said reservoir comprises an elongate tube open at an end remote from said chamber.
  • Apparatus according to claim 1 further including means to maintain a low pressure in said chamber.
  • Apparatus according to claim 1 including gas supply means for supplying a flow of gas through said duct.
  • Apparatus according to claim 1 including conduit means for conveying gas flowing through said duct to a patient.

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  • Health & Medical Sciences (AREA)
  • Anesthesiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Environmental Sciences (AREA)
  • Emergency Medicine (AREA)
  • Pulmonology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
  • External Artificial Organs (AREA)
US68364A 1969-09-09 1970-08-31 Gas evacuator for breathing apparatus Expired - Lifetime US3662774A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE12384/69A SE348944B (de) 1969-09-09 1969-09-09

Publications (1)

Publication Number Publication Date
US3662774A true US3662774A (en) 1972-05-16

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ID=20295660

Family Applications (1)

Application Number Title Priority Date Filing Date
US68364A Expired - Lifetime US3662774A (en) 1969-09-09 1970-08-31 Gas evacuator for breathing apparatus

Country Status (5)

Country Link
US (1) US3662774A (de)
DE (1) DE2041446A1 (de)
DK (1) DK125827B (de)
GB (1) GB1322001A (de)
SE (1) SE348944B (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4143673A (en) * 1975-06-17 1979-03-13 Ab Kalle-Regulatorer Pressure regulator
US4243064A (en) * 1977-06-03 1981-01-06 Tuxhorn Kg Bypass valve for pumps, heating systems and the like
US4312339A (en) * 1980-03-31 1982-01-26 Porter Instrument Co., Inc. Device for administering an anesthetic gas
US5878743A (en) * 1996-09-23 1999-03-09 Respironics, Inc. Pressure sensitive flow control valve
US6041781A (en) * 1996-05-14 2000-03-28 Aglan; Magdy Yassin Breathing bag
US6098622A (en) * 1998-10-15 2000-08-08 Ntc Technology Inc. Airway valve to facilitate re-breathing, method of operation, and ventilator circuit so equipped
GB2383397A (en) * 2001-12-20 2003-06-25 Internat Safety Instr Inc Recharging valve for a breathing apparatus
US20060196727A1 (en) * 2005-02-18 2006-09-07 Shields Troy R Method of adapting an automatic greasing apparatus for hydraulic track tensioning
US20060249209A1 (en) * 2003-09-05 2006-11-09 Ben Jonathan K Valves
US20090223567A1 (en) * 2008-03-05 2009-09-10 Ahearn David J Nitrous Oxide Safety System

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2728723C3 (de) * 1977-06-25 1980-03-27 Draegerwerk Ag, 2400 Luebeck Anordnung zur Absaugung von Gasen im medizinischen Bereich und Vakuumrückschlagventil hierfür
DK421278A (da) * 1977-09-23 1979-03-24 Medishield Corp Ltd Gasaandingsudstyr
US4291689A (en) * 1979-10-19 1981-09-29 Airco, Inc. Evacuation manifold for medical anesthesia circuits
DE3236649C2 (de) * 1982-10-04 1984-12-06 Friedrich-Wilhelm Dr. 3057 Neustadt Sydow Absaugvorrichtung für Narkosegase

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2918086A (en) * 1948-10-18 1959-12-22 Maschinefabrik Surth Zweignied Valve devices
US3192946A (en) * 1963-04-15 1965-07-06 Heil Co Breather check valves

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2918086A (en) * 1948-10-18 1959-12-22 Maschinefabrik Surth Zweignied Valve devices
US3192946A (en) * 1963-04-15 1965-07-06 Heil Co Breather check valves

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4143673A (en) * 1975-06-17 1979-03-13 Ab Kalle-Regulatorer Pressure regulator
US4243064A (en) * 1977-06-03 1981-01-06 Tuxhorn Kg Bypass valve for pumps, heating systems and the like
US4312339A (en) * 1980-03-31 1982-01-26 Porter Instrument Co., Inc. Device for administering an anesthetic gas
US6041781A (en) * 1996-05-14 2000-03-28 Aglan; Magdy Yassin Breathing bag
US5878743A (en) * 1996-09-23 1999-03-09 Respironics, Inc. Pressure sensitive flow control valve
US6098622A (en) * 1998-10-15 2000-08-08 Ntc Technology Inc. Airway valve to facilitate re-breathing, method of operation, and ventilator circuit so equipped
GB2383397A (en) * 2001-12-20 2003-06-25 Internat Safety Instr Inc Recharging valve for a breathing apparatus
GB2383397B (en) * 2001-12-20 2005-10-12 Internat Safety Instr Inc Breathing apparatus
US20060249209A1 (en) * 2003-09-05 2006-11-09 Ben Jonathan K Valves
US20060196727A1 (en) * 2005-02-18 2006-09-07 Shields Troy R Method of adapting an automatic greasing apparatus for hydraulic track tensioning
US20090223567A1 (en) * 2008-03-05 2009-09-10 Ahearn David J Nitrous Oxide Safety System
US10076618B2 (en) 2008-03-05 2018-09-18 David J. Ahearn Nitrous oxide safety system

Also Published As

Publication number Publication date
DK125827B (da) 1973-05-14
GB1322001A (en) 1973-07-04
SE348944B (de) 1972-09-18
DE2041446A1 (de) 1971-04-01

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SIEMENS A.G., VBA PA PB, POSTFACH 22 0261, D-8000

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:AGA AKTIEBOLAG,;REEL/FRAME:004049/0019

Effective date: 19811209

AS Assignment

Owner name: SIEMENS A.G., VBA PA PB, POSTFACH 22 0261, D-8000

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. RERECORD OF INSTRUMENT RECORDED APRIL 19, 1983, REEL 4117 FRAMES 218-219 TO CORRECT ADDRESS OF ASSIGNEES IN A PREVIOUSLY RECORDED ASSIGNMENT;ASSIGNOR:AGA AKTIEBOLAG;REEL/FRAME:004117/0218

Effective date: 19830117

AS Assignment

Owner name: AGA AKTIEBOLAG, STATELESS

Free format text: RERECORD OF INSTRUMENT RECORDED APRIL 19 83 REEL 417 REAMES 218 TO CORRECT ADDRESS OF ASSIGNEE IN A PREVIOUSLY RECORDED ASSIGMENT;ASSIGNOR:AGA AKTIEBOLAG;REEL/FRAME:004157/0282

Effective date: 19830117

Owner name: AGA AKTIEBOLAG, BERLIN UND MUENCHEN, WITTELSBACHER

Free format text: RERECORD OF INSTRUMENT RECORDED APRIL 19 83 REEL 417 REAMES 218 TO CORRECT ADDRESS OF ASSIGNEE IN A PREVIOUSLY RECORDED ASSIGMENT;ASSIGNOR:AGA AKTIEBOLAG;REEL/FRAME:004157/0282

Effective date: 19830117