US3400712A - System for intermittently dispensing oxygen or other gas suitable for breathing - Google Patents

System for intermittently dispensing oxygen or other gas suitable for breathing Download PDF

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Publication number
US3400712A
US3400712A US479128A US47912865A US3400712A US 3400712 A US3400712 A US 3400712A US 479128 A US479128 A US 479128A US 47912865 A US47912865 A US 47912865A US 3400712 A US3400712 A US 3400712A
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United States
Prior art keywords
oxygen
person
breathing
solenoid valve
belt
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Expired - Lifetime
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US479128A
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English (en)
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James E Finan
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Individual
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Priority to US479128A priority Critical patent/US3400712A/en
Priority to GB35909/66A priority patent/GB1158124A/en
Priority to DE19666600039U priority patent/DE6600039U/de
Priority to NL6611385A priority patent/NL6611385A/xx
Priority to SE10949/66A priority patent/SE329896B/xx
Application granted granted Critical
Publication of US3400712A publication Critical patent/US3400712A/en
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    • 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. ventilators; Tracheal tubes
    • A61M16/06—Respiratory or anaesthetic masks
    • A61M16/0666—Nasal cannulas or tubing
    • 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. ventilators; Tracheal tubes
    • A61M16/021—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes operated by electrical means
    • 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. ventilators; Tracheal tubes
    • A61M16/06—Respiratory or anaesthetic masks
    • A61M16/0666—Nasal cannulas or tubing
    • A61M16/0672—Nasal cannula assemblies for oxygen therapy
    • A61M16/0677—Gas-saving devices therefor
    • 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. ventilators; Tracheal tubes
    • A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
    • A61M2016/0015—Accessories therefor, e.g. sensors, vibrators, negative pressure inhalation detectors
    • A61M2016/0018—Accessories therefor, e.g. sensors, vibrators, negative pressure inhalation detectors electrical
    • A61M2016/0024—Accessories therefor, e.g. sensors, vibrators, negative pressure inhalation detectors electrical with an on-off output signal, e.g. from a switch

Definitions

  • ABSTRACT OF THE DISCLOSURE A portable, self-contained apparatus useful for dispensing a gas such as oxygen.
  • a gas such as oxygen.
  • the gas or oxygen is dispensed only when the person wearing the device is inhaling.
  • the supply of oxygen is interrupted. This is accomplished by including in the device adapted to be worn on the person, along with the oxygen supply, an oxygen flow control means and the oxygen dispensing means which may be a nasal cannula connected with the oxygen source via the oxygen flow control means by means of a conduit, an actuating means responsive to the torso body movement of the person wearing the device.
  • the actuating means comprises a belt and a switch with a lost motion connection between the belt and the switch, the switch being operatively connected to the oxygen flow control means which may be a solenoid valve.
  • the oxygen flow control means which may be a solenoid valve.
  • This invention relates to a system or device or apparatus for dispensing oxygen or other gas suitable for inhalation. More particularly, this invention relates to a portable system or device for intermittently dispensing oxygen for breathing. Still more particularly, this invention relates to a system or apparatus capable of being Worn on the person and for dispensing intermittently oxygen for breathing.
  • this invention is directed to a portable oxygen supply apparatus useful for intermittently supplying oxygen for breathing. In accordance with another embodiment this invention is directed to a method or technique for supplying oxygen for breathing. In accordance with yet another embodiment this invention is directed to a technique of oxygen therapy particularly useful for an emphysematous person. In accordance with yet another embodiment this invention is directed to a system for training or aiding in proper breathing control, particularly useful in emphserna therapy involving the supply of oxygen for breathing.
  • oxygen is normally gaseous and has a low boiling point
  • strong and heavy containers must be employed'to contain the oxygen. This has contributed sub. stantially to the weight of the portable oxygen breathing apparatus and to the effort and discomfort of the person carrying the same.
  • such systems and technique for supplying oxygen for breathing in a manner when oxygen is supplied continuously, such as by means of a nasal cannula or the like, the continuous supply of oxygen, particularly over a long period of time, may have an irritant effect upon the mucous membranes and the like in contact therewith. This irritant effect can to some extent be mollified by humidifying the oxygen.
  • Another object of this invention is to provide a relatively lightweight, simple, portable system for dispensing oxygen intermittently and on demand.
  • Another object of this invention is to provide a technique for supplying oxygen for breathing in a manner particularly useful for an emphysematous person or in oxygen therapy for emphysema.
  • Yet another object of this invention is to provide a portable oxygen supply system adapted to be worn on the person and providing a longer useful life for a given amount of oxygen contained in the system as compared with other known comparable portable systems which continuously dispense oxygen.
  • Still another object of this invention is to provide a portable system adapted to be worn on the person for the supply of gaseous oxygen for breathing purposes wherein the face of the person wearing the same is free and exposed save for a nasal cannula or the like for the supply of the dispensed oxygen and wherein the freedom of movement of the person, including use of nose or mouth, wearing the system is substantially unrestricted.
  • Still another object of this invention is to provide an oxygen supply system adapted to be worn on the person for the supply of oxygen for breathing purposes via the nose or mouth and only when the person is inhaling, the mouth or nose not being necessarily sealed to the system during use.
  • FIG. 1 schematically illustrates major elements of the oxygen supply system in accordance with this invention
  • FIG. 2 shows a disposition and arrangement of the system or device in accordance with this invention when worn on the person
  • FIG. 3 is a plan view in partial cross section of a switching or actuating element useful in the system or apparatus of this invention; and wherein FIG. 4 is a cross sectional view taken through lines 44 of FIG. 3.
  • a system and/or apparatus wherein oxygen or other gas suitable for breathing is dispensed or delivered intermittently on demand. More particularly in accordance with this invention there is provided a system and/or apparatus wherein oxygen or other gas suitable for breathing is dispensed intermittently and on demand only when the person employing said system and/ or apparatus is inhaling, the supply of oxygen or other suitable gas being interrupted or shut off during exhaling.
  • the system and/ or apparatus in accordance with this invention comprises an oxygen supply or tank 10, such as an oxygen tank together with conventional pressure reduction and flow control valves and equipment.
  • an oxygen supply or tank 10 such as an oxygen tank
  • a humidifying device or humidifier 11 for humidifying the gaseous oxygen issuing from oxygen supply just before it is dispensed to the user.
  • the dispensed gaseous oxygen is arranged to flow through a suitable valving device, such as solenoid valve 12.
  • Solenoid valve 12 is adapted to be opened or closed to permit the flow or interruption of the flow of oxygen therethrough depending upon whether or not solenoid valve 12 is opened or closed.
  • solenoid valve 12 Operation of the solenoid valve 12 is effected by means of a suitable electrical power source, such as battery 14, and actuating mechanism or switch 15.
  • a suitable electrical power source such as battery 14, and actuating mechanism or switch 15.
  • switch When switch is closed solenoid valve 12 is actuated to open and to permit the flow of gaseous oxygen to a suitable dispensing means, such as nasal cannula 16.
  • switch 15 When switch 15 is opened the flow of current from. battery 14 to solenoid valve 12 is interrupted and solenoid valve 12 closed thereby shutting otf the flow of oxygen to nasal cannula 16.
  • actuating mechanism or switch 15 is operated so that oxygen is supplied to nasal cannula 16 intermittently and on demand during inhaling and only when the person Wearing or employing the system and/or apparatus of this invention is inhaling.
  • FIG. 2 of the drawings which illustrates generally the portable oxygen dispensing system and/or apparatus of this invention and 'how it may be adapted to be Worn on the person, there is illustrated a container 20 suspended from one shoulder of the person wearing the same by means of shoulder strap 21.
  • Container 20 is provided with an oxygen source, such as a small oxygen tank, together with an associated humidifying device and battery and solenoid valve, all not shown but suitably disposed within container 20.
  • Conduit 22, such as a flexible plastic tubing leads from container 20 to nasal cannula 24 which is held in place on the face of the person by means of adjustable strap 25.
  • Flexible tubing or conduit 22 is in fluid communication with the oxygen source within container 20 and the humidifying device and solenoid valve therein for the transmission and dispensing of the oxygen to nasal cannula 24.
  • the solenoid valve within container 20 is actuated by -means of a switch, generally indicated by reference numeral 26, which is in electrical contact with the battery and solenoid valve within container 20 by means of Wire or conductor 28.
  • switch 26 is positioned and adapted to be worn on the torso of the person by means of belt 29 which encircles the body of the person wearing the same at the waist, below the rib cage, in substantially the usual belt-wearing position.
  • the system and/or apparatus of this invention employed as illustrated in FIG. 2 of the drawings is specially suited to promote diaphragmatic breathing of the person wearing the same. If desired, however, the belt may be worn to encircle the chest if thoracic breathing is predominant. In normal persons breathing is both thoracic and diaphragmatic.
  • the diaphragm in diaphragmatic breathing the diaphragm, during inhalation, descends. Upon descension the diaphragm tends to draw air into the lungs while at the same time causing the abdomen to expand. At the conclusion of diaphragmatic inhalation the diaphragm ascends thereby tending to expel air from the lungs and causing the abdomen to contract.
  • Switch 26 is effective, upon inhalation and expansion or enlargement of the abdomen as the diaphragm descends, to dispense oxygen via tubing 22 and nasal cannula 24 to the person breathing and to shut off the flow of oxygen as the person commences to exhale as the diaphragm ascends with resulting contraction of the abdomen.
  • This disposition and arrangement for supplying and interrupting the supply of oxygen through diaphragmatic breathing is particularly advantageous for an emphysema tous person since an emphysematous person is encouraged to breath diaphragmatically.
  • the system and/ or apparatus of this invention since it can be employed to be operative exclusively with diaphragmatic breathing, can be employed to encourage diaphragmatic breathing and, in use, to award the person properly breathing diaphragmatically with a draught of oxygen. If the person employing the device and/ or apparatus of this invention does not properly breath, ie does not breath enough diaphragmatically, no oxygen is supplied.
  • the person employing the system and/or apparatus of this invention is more conscious and aware of diaphragmatic breathing and the necessity of diaphragmatic breathing if oxygen is to be supplied.
  • This arrangement and disposition, as indicated hereinabove, is particularly valuable for an emphysematous person.
  • FIGS. 3 and 4 which illustrate in greater detail a switch suitable for use in a system and/or apparatus of this invention, as illustrated therein ends of belt 29 are expandably held together by means of springs 30.
  • Belt 29 is adapted, as illustrated, to encircle the wearer and is fastened to the wearer by means of an adjustable buckle, not shown.
  • Springs 30 are fastened to belt 29 by suitable means, such as rivets 30a.
  • the switch is made up of an outer, bottle-shaped shell or body 31 of suitable material, such as glass or plastic.
  • the necked-down or neck portion of switch body 31 is fastened to belt 29 by means of clip 32 and the cylindrical portion of switch body 31 is fastened to belt 29 by means of clip 34.
  • a stiff member 35 such as a stiff wire, is fastened at one end to belt 29 by means of rivet 35a.
  • the other end of stiff wire 35 is disposed within switch body 31, stiff wire 35 being slidably fitted within the neck portion thereof.
  • the other end of stiff wire 35 is formed into loop 35b.
  • Wire or conductor 28 is disposed to pass through cylinder plug or body 36'slidably disposed within switch body 31.
  • plug 36 is made of insulatingmaterial and fairly closely fitted within switch body 31 for a snug fit and so that sufficient friction is present between plug 36 and switch body 31 such that plug 36 does not tend to chatter or move therein unless positively moved by wire 35.
  • Metallic wire elements 28a and 28b of conductor 28 enter one end of and are separated within plug 36 and pass therethrough. At the other end of plug 36 the insulating material is stripped from elements 28a and 28b and the bare metallic electricallyconducting elements exposed. Bare metallic elements 28a and 28b of conductor 28 are exposed to form two separate loops. Disposed within loops 28a and 28b is bar 38 of suitable electrically conductive material, such as copper. Bar 38 is fastened or connected to stiff wire 35 with the result that stiff wire 35 at loop portion 35b thereof together with bar 38 forms a lost motion-type connection with respect to plug 36 via looped elements 28a and 28b.
  • stiff wire 35 pulls copper bar 38 to contact elements 28a and 28b to complete the circuit by electrically joining elements 28a and 28b.
  • stiff wire 35 moves bar 38 out of contact with elements 28a and 28b pressing bar 38 against plug 36 and moving plug 36 backwards Within switch body 31.
  • the circuit is broken and the solenoid valve closed thereby preventing the How of oxygen to the nasal cannula during the period of exhalation when oxygen is not required and would be wasted.
  • a switch operative to actuate or to open a solenoid valve to permit the flow of oxygen during inhalation only and to close the solenoid valve and to prevent the flow of oxygen when exhalation is commenced.
  • the switch employed in the apparatus in accordance with this invention is motion sensitive and can be made such that upon the slightest expansion or contraction of the chest or abdomen, an electrical connection is made to permit oxygen to be dispensed through the solenoid valve during inhalation and to break the electrical connection, thereby interrupting the flow of oxygen during exhalation.
  • switches effective upon diaphragmatic inhalation to dispense oxygen and effective upon diaphragmatic exhalation to interrupt the supply of oxygen, all in the manner described in accordance with this invention, are suitable.
  • Such switches may be mechanical, electromechanical, electrical, magnetic, and combinations thereof in operation.
  • the oxygen supply source may be from a central source of large capacity and even remote from the person.
  • the benefits of this invention are still obtainable in such a situation since the actuating means attached to the person is effec tive to supply and dispense the oxygen from this central source only when the person is inhaling.
  • Portable apparatus useful for oxygen therapy and capable of being worn on the person permitting freedom of movement of the person wearing the apparatus and leaving the face exposed and the nose and mouth of the person Wearing the apparatus substantially unrestricted, comprising a source of oxygen, oxygen flow control means, an electrical circuit comprising an electric circuit means, a source of electrical power to operate through said electrical circuit said oxygen flow control means, oxygen dispensing means, a conduit in fluid communication with said oxygen source and said oxygen dispensing means for supplying oxygen to the person wearing said apparatus, said oxygen flow control means being disposed in association with said conduit to perrnit the flow or the interruption of the fiow of oxygen through said conduit, actuating means to actuate said oxygen flow control means, said actuating means comprising a belt adapted to encircle the torso of the person wearing said apparatus and to expand and contract with the torso body movement of the person wearing said apparatus, said electric circuit means being carried on said belt and adapted to permit the supply of electrical power via said electrical circuit from said electrical power source to said oxygen flow control means when
  • said oxygen flow control means is a solenoid valve
  • said oxygen dispensing means is a nasal cannula and including a humidifying means effective to humidify the oxygen flowing from said oxygen source to said nasal cannula.

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  • Health & Medical Sciences (AREA)
  • Pulmonology (AREA)
  • Emergency Medicine (AREA)
  • Biomedical Technology (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Otolaryngology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
US479128A 1965-08-12 1965-08-12 System for intermittently dispensing oxygen or other gas suitable for breathing Expired - Lifetime US3400712A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US479128A US3400712A (en) 1965-08-12 1965-08-12 System for intermittently dispensing oxygen or other gas suitable for breathing
GB35909/66A GB1158124A (en) 1965-08-12 1966-08-10 Apparatus For Intermittently Dispensing Oxygen Or Other Gas Suitable For Breathing
DE19666600039U DE6600039U (de) 1965-08-12 1966-08-11 Vorrichtung zum intermittierenden abgeben von sauerstoff oder einem anderen fuer die atmung geeigneten gas
NL6611385A NL6611385A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1965-08-12 1966-08-12
SE10949/66A SE329896B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1965-08-12 1966-08-12

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US479128A US3400712A (en) 1965-08-12 1965-08-12 System for intermittently dispensing oxygen or other gas suitable for breathing

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US3400712A true US3400712A (en) 1968-09-10

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US (1) US3400712A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE6600039U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1158124A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL6611385A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
SE (1) SE329896B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987002590A1 (en) * 1985-11-05 1987-05-07 Shattuck, Leonard, L. Positive-flow, demand responsive, respiratory regulator
US4665911A (en) * 1983-11-25 1987-05-19 Electro-Fluidics Intermittent supplemental oxygen apparatus and method
US4744356A (en) * 1986-03-03 1988-05-17 Greenwood Eugene C Demand oxygen supply device
US4915103A (en) * 1987-12-23 1990-04-10 N. Visveshwara, M.D., Inc. Ventilation synchronizer
EP0678304A1 (de) * 1994-04-18 1995-10-25 Peter Schneider Steuerung für den Durchflussregler in einem Sauerstofftherapiegerät
US5492110A (en) * 1994-12-23 1996-02-20 Golden West Communications Switched alert circuit for fireman's breathing system
US6371114B1 (en) 1998-07-24 2002-04-16 Minnesota Innovative Technologies & Instruments Corporation Control device for supplying supplemental respiratory oxygen
US6532958B1 (en) 1997-07-25 2003-03-18 Minnesota Innovative Technologies & Instruments Corporation Automated control and conservation of supplemental respiratory oxygen
US20080202522A1 (en) * 2007-02-23 2008-08-28 General Electric Company Setting mandatory mechanical ventilation parameters based on patient physiology
US20080202520A1 (en) * 2007-02-23 2008-08-28 General Electric Company Setting mandatory mechanical ventilation parameters based on patient physiology
US20080202519A1 (en) * 2007-02-23 2008-08-28 General Electric Company Setting mandatory mechanical ventilation parameters based on patient physiology
US20080202517A1 (en) * 2007-02-23 2008-08-28 General Electric Company Setting madatory mechanical ventilation parameters based on patient physiology
US20080202518A1 (en) * 2007-02-23 2008-08-28 General Electric Company Setting mandatory mechanical ventilation parameters based on patient physiology
US20080230063A1 (en) * 2007-03-23 2008-09-25 General Electric Company Setting inspiratory time in mandatory mechanical ventilation based on patient physiology, such as forced inhalation time
US20080230060A1 (en) * 2007-03-23 2008-09-25 General Electric Company Setting inspiratory time in mandatory mechanical ventilation based on patient physiology, such as when tidal volume is inspired
US20080230061A1 (en) * 2007-03-23 2008-09-25 General Electric Company Setting expiratory time in mandatory mechanical ventilation based on a deviation from a stable condition of end tidal gas concentrations
US20080230064A1 (en) * 2007-03-23 2008-09-25 General Electric Company Setting inspiratory time in mandatory mechanical ventilation based on patient physiology, such as when forced inhalation flow ceases
US7448594B2 (en) 2004-10-21 2008-11-11 Ameriflo, Inc. Fluid regulator
US20090007911A1 (en) * 2006-01-06 2009-01-08 Doreen Cleary Pulmonary Rehabilitation Providing Respiratory Assistance by Application of Positive Airway Pressure
US7617826B1 (en) 2004-02-26 2009-11-17 Ameriflo, Inc. Conserver
US20110240017A1 (en) * 2010-04-02 2011-10-06 Glenn Butler Apparatus and methods for microbaric oxygen delivery
US8146592B2 (en) 2004-02-26 2012-04-03 Ameriflo, Inc. Method and apparatus for regulating fluid flow or conserving fluid flow
US20150075528A1 (en) * 2013-09-18 2015-03-19 Susan Leeds Kudo Method and apparatus for tangle-free oxygen lines
US9737450B2 (en) 2013-09-04 2017-08-22 Microbaric Oxyygen Systems, Llc Hyperoxic therapy systems, methods and apparatus
US20170326328A1 (en) * 2016-05-11 2017-11-16 Joshua Hensley Peripheral neuropathy breathing device

Families Citing this family (5)

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NL8500314A (nl) * 1984-07-19 1986-02-17 Drs Erna Peltzer Inrichting voor het bepalen van het ademhalingsgedrag van een patient.
FI81500C (fi) * 1985-05-23 1990-11-12 Etelae Haemeen Keuhkovammayhdi Andningsbehandlingsapparat.
DE3823381A1 (de) * 1987-11-03 1989-05-24 Draegerwerk Ag Kreislaufatemschutzgeraet
DE3901919A1 (de) * 1989-01-24 1990-07-26 Draegerwerk Ag Kreislaufatemschutzgeraet
DE3906202A1 (de) * 1989-02-28 1990-09-06 Medicommerz Gmbh Verfahren und vorrichtung zur zufuehrung von atemgas

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US2693178A (en) * 1949-12-21 1954-11-02 Air Reduction Demand type gas regulator
FR1078669A (fr) * 1953-04-08 1954-11-22 Air Equipement Perfectionnements aux dispositifs de respiration
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US3083707A (en) * 1956-02-13 1963-04-02 Henry W Seeler Device for treatment of pulmonary diseases
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US1176146A (en) * 1913-04-14 1916-03-21 Floyd B Jones Instrument for administering anesthetics.
US1392700A (en) * 1920-09-21 1921-10-04 Henry M Oyen Lung-exercising device
US2185069A (en) * 1938-05-07 1939-12-26 Ohio Chemical & Mfg Company Anesthetic apparatus
US2693178A (en) * 1949-12-21 1954-11-02 Air Reduction Demand type gas regulator
US2774348A (en) * 1952-05-31 1956-12-18 John H Emerson Artificial respirator
FR1078669A (fr) * 1953-04-08 1954-11-22 Air Equipement Perfectionnements aux dispositifs de respiration
US2868199A (en) * 1955-05-20 1959-01-13 Charles H Hudson Cannula
US3083707A (en) * 1956-02-13 1963-04-02 Henry W Seeler Device for treatment of pulmonary diseases
US2912979A (en) * 1956-02-17 1959-11-17 Lieber Samuel Loewenstein Apparatus for administering and conserving gas
US3043302A (en) * 1958-05-08 1962-07-10 Oxy Gear Inc Flow control unit for portable inhalators
DE1124631B (de) * 1959-09-04 1962-03-01 Walter Minner Atemkontrollguertel
US3191596A (en) * 1960-09-19 1965-06-29 Forrest M Bird Respirator
US3186252A (en) * 1962-06-25 1965-06-01 Specialties Dev Corp Actuator
US3208449A (en) * 1964-05-07 1965-09-28 Jr Roscoe G Bartlett Compact walk-around rebreathing device

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4665911A (en) * 1983-11-25 1987-05-19 Electro-Fluidics Intermittent supplemental oxygen apparatus and method
WO1987002590A1 (en) * 1985-11-05 1987-05-07 Shattuck, Leonard, L. Positive-flow, demand responsive, respiratory regulator
US4744356A (en) * 1986-03-03 1988-05-17 Greenwood Eugene C Demand oxygen supply device
US4915103A (en) * 1987-12-23 1990-04-10 N. Visveshwara, M.D., Inc. Ventilation synchronizer
EP0678304A1 (de) * 1994-04-18 1995-10-25 Peter Schneider Steuerung für den Durchflussregler in einem Sauerstofftherapiegerät
EP0684048A1 (de) * 1994-04-18 1995-11-29 Peter Schneider Vorrichtung zur Sauerstofftherapie
US5492110A (en) * 1994-12-23 1996-02-20 Golden West Communications Switched alert circuit for fireman's breathing system
US6532958B1 (en) 1997-07-25 2003-03-18 Minnesota Innovative Technologies & Instruments Corporation Automated control and conservation of supplemental respiratory oxygen
US6561187B2 (en) 1997-07-25 2003-05-13 Minnesota Innovative Technologies & Instruments Corporation Control of supplemental respiratory oxygen
US20030145852A1 (en) * 1997-07-25 2003-08-07 Minnesota Innovative Technologies And Instruments Control of supplemental respiratory Oxygen
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GB1158124A (en) 1969-07-16
DE6600039U (de) 1969-01-02
NL6611385A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1967-02-13
SE329896B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1970-10-26

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