US3830257A - Air-gas mixture metering device, notably for respiratory mask - Google Patents

Air-gas mixture metering device, notably for respiratory mask Download PDF

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Publication number
US3830257A
US3830257A US00263772A US26377272A US3830257A US 3830257 A US3830257 A US 3830257A US 00263772 A US00263772 A US 00263772A US 26377272 A US26377272 A US 26377272A US 3830257 A US3830257 A US 3830257A
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chamber
gas
holes
passage
volume
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US00263772A
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English (en)
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R Metivier
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MINERVE
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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
    • 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
    • A61M16/0057—Pumps therefor
    • A61M16/0081—Bag or bellow in a bottle
    • 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
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/12—Preparation of respiratory gases or vapours by mixing different gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/10—Mixing gases with gases
    • B01F23/19—Mixing systems, i.e. flow charts or diagrams; Arrangements, e.g. comprising controlling means
    • B01F23/191—Mixing systems, i.e. flow charts or diagrams; Arrangements, e.g. comprising controlling means characterised by the construction of the controlling 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
    • A61M16/0057—Pumps therefor
    • A61M16/0075—Bellows-type
    • 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
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/105—Filters
    • A61M16/106—Filters in a path
    • A61M16/107—Filters in a path in the inspiratory path
    • 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
    • A61M16/20—Valves specially adapted to medical respiratory devices
    • 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
    • A61M16/20—Valves specially adapted to medical respiratory devices
    • A61M16/201—Controlled valves
    • A61M16/207—Membrane valves with pneumatic amplification stage, i.e. having master and slave membranes
    • 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
    • A61M16/20—Valves specially adapted to medical respiratory devices
    • A61M16/208—Non-controlled one-way valves, e.g. exhalation, check, pop-off non-rebreathing valves
    • 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
    • Y10T137/2499—Mixture condition maintaining or sensing
    • 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
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86815—Multiple inlet with single outlet
    • 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
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86815—Multiple inlet with single outlet
    • Y10T137/86823—Rotary valve

Definitions

  • ABSTRACT 137/6254 A device providing a predetermmed mlxture of atmo- 51 1111.
  • C1 Fl6k 11/00, 005d 11 /02 spherie air and oxygen to a respiratory mask includes [58] Field of Search 128/1455, 145.6, 145.7, a first chamber responsive to pulses of oxygen and e 23 453 3 37 133 93 0 07, second chamber, which provides the output to the 254 25 41; 251/206 207 mask, which is responsive to the first chamber.
  • a mixing chamber is provided and is constructed such that 5 R f n Cited although the ratio of atmospheric air and oxygen pro- P vided to the mask may vary, the total amount of mixture remains at a predetermined value.
  • the present invention relates in general to metering devices and has specific reference to a device for proportioning a mixture of air and another gas under pressure, notably oxygen, more particularly for supplying a respiratory mask.
  • the second chamber aforesaid consists of a bellows suspended from an upper inner wall of the first chamber and weighted at its bottom portion; while the constantoutput adjustable mixing device comprises a mixing chamber of which one wall element has a relatively great number of small holes formed therethrough, these holes having preferably the same dimensions, and an adjustable distributor for delivering the air and oxygen flows from the corresponding intakes, respectively, to first and second sets of holes formed in said wall element, comprising first and second variable numbers of holes, respectively, of which the sum is preferably constant.
  • FIG. 1 is a vertical section taken along the median or center line of the device, and 7 FIG. 2 is a plan view from above showing a detail as seen at II-II of FIG. 1.
  • the specific form of embodiment of the present invention which is illustrated in the attached drawing comprises essentially a body 1, preferably of suitable metal or alloy, having formed preferably centrally or its upper portion a cylindrical bore 2 having a vertical axis AA.
  • the bottom of this bore 2 provides a mixing chamber 3 of which the top wall element comprises a partition disc 4 bearing with its circular edge on a shoulder 5 of bore 2.
  • this disc 4 has formed therethrough a relatively great number of holes 6a, 6b disposed on two concentric circular arcs centered to said axi AA.
  • each circular row of holes 6a, 6b comprises 20 small holes of same dimensions notably of the same diameter and same relative spacing.
  • a cylindrical drum 7 is engaged in said bore 2 so as to rotate freely therein, with its lower face urged against the top face of disc 4 by a coil compression spring 8 reacting against a plug 9 threaded in a tapped portion of the bore 2.
  • a stem 10 rigid with drum 7 extends through said plug 9 formed to this end with a suitable hole, and the outer end of said stem 10 carries a knurled knob 11 whereby the drum 7 can be rotated in said bore 2.
  • the lower face of drum 7 has formed therein a pair of distributor chambers 12 and 13 in the form of a pair of segments of circular rings of the same angular amplitude, disposed symmetrically to the axis AA and shown in FIG.
  • the two distributor chambers 12 and 13 have a radial width slightly greater than that of the two circular rows of holes 6a and 6b of disc 41 and the lengths of these chambers are equal and correspond substantially, in the example illustrated, to half the length of each one of the circular rows of holes 6a, 6b.
  • Known means (not shown) are provided to hold the disc 4 against rotation in the bottom of bore 2 and to limit the permissible rotation of drum 7 about the axis AA between two end positions. In one position, none of the holes 60, 6b register with one of said chambers 12 or 13, and in the other position a maximum number of holes, for example 20, register with the other chamber 13 or 12.
  • Drum 7 defines two annular grooves, l4, 15 formed in its cylindrical side surface which communicate with the aforesaid distribution chambers 12 and 13 respectively via passages 16 and 17 formed through the drum 7.
  • the chamber is connected via a passage 19 and a pipe 20 of said body 1 and also via a preferably flexible hose (not shown) to the outlet 21a of an automatic respirator 21 producing a pulsated flow of oxygen under pressure.
  • the present invention is not strictly limited by the use of a specific type of automatic respirator of this character, of which various types are known in the art; one of them is disclosed in my US. Pat. No.
  • a bellows 22 weighted at its lower portion 23 is suspended from the lower end of said body 1 thereby defining a second chamber consisting of the inner space of this bellows 22.
  • the second chamber communicates with the mixing chamber 3 formed in said body 1 via a passage 24 formed in the lower portion of said body 1 which passage includes a non-return valve 25.
  • the inner space of bellows 22, forming said second chamber is connected directly to a respiratory mask (not shown) via a passage 26 formed in the lower portion of body 1, a pipe 27 fitted in said body 1 and a preferably flexible hose (not shown), in which an air filter is preferably inserted.
  • first and second, constantly open atmospheric air intakes respectively, passages 28 and 29 formed in said body 1.
  • the second atmospheric air intake 29 also connects to an oxygen passage such as 30 leading into the annular groove 14 of drum 7, passage 30 is formed in the body 1 so as to open into the first chamber 18, and has a valve inserted therein.
  • This valve consists essentially of a lateral chamber 31 inserted in said passage 30.
  • Within chamber 31 is a seat 32 and a flexible membrane 33 normally somewhat spaced from said seat 32 but adapted to engage and close seat 32 when an overpressure is exerted on the face of membrane 33 which is opposite to said seat 32.
  • this overpressure is produced in the corresponding portion of chamber 31 via a pipe 34 for connecting a portion of chamber 31 to a source of pressure pulsated in synchronism with the oxygen flow produced by the respirator 21.
  • the pulsated pressure on membrane 33 is provided from an auxiliary outlet 21b which provides pulses in synchronism with the oxygen flow delivered through main outlet 21a.
  • Each pulsated oxygen flow produced by the respirator 21 increases the pressure in the first chamber 18 due to the latter being isolated from the second atmospheric air intake 29 by the engagement of membrane 33 with its seat 32 caused by the synchronous pulses provided at pipe 34.
  • the pressure increment in said first chamber 18 is attended by the compression of bellows 22. This causes valve 25 to close and the contents of the bellows is thus forced towards the respiratory mask via passage 26 and pipe 27.
  • the membrane 33 resumes its position of equilibrium illustrated in FIG. 1, in which it is spaced from the seat 32, and the oxygen under pressure in the first chamber 18 escapes partly through the second atmospheric air intake 29 and partly through the annular groove 14 of drum 7.
  • the fraction of this oxygen which penetrates undertlfese conditions into the bellows 22 notably via passage 16 and mixing chamber 3, and also through the then open non-return valve 25, depends on the number of holes 6a, 6b of disc 4 which register with said chamber 12 and therefore on the angular position or setting of drum 7.
  • the amount of atmospheric air drawn through passage 28, annular groove 15, passage 17 and chamber 13 of drum 7, as well as through the mixing chamber 3 and nonreturn valve 25, due to the expansion of bellows 22 caused by its weight 23, is also subordinate to the angular position of said drum 7.
  • the total amount of air and oxygen delivered to the bellows 22 is independent, of the angular position of drum 7 since, on the one hand, the total number of holes 6a, 6b fed simultaneously from the two distributor chambers 12 and I3 is constantly the same, and these holes 6a, 6b have the same dimensions.
  • the mass of the air and oxygen mixture contained in the bellows 22, which is subsequently forced towards the respiratory mask during the next pulsated oxygen flow, is substantially independent of the angular position of drum 7, whereas the proportions of air and oxygen constituting this gaseous mass are directly subordinate to this position, so that the drum control knob 11 may be provided with an index or pointer 35 registering with a corresponding graduation or scale (not shown) displaying for example the oxygen percentage and carried by the top surface of body 1.
  • the device of the present invention can be embodied in many different ways without departing from the basic principle of the invention.
  • the first and second chambers may be designed in many different manners, provided that they are separated by at least one deformable wall such as a membrane or a movable wall, such as a piston, so that any pressure increment in the first chamber is allegedlyd by a reduction in the volume of the other chamber.
  • the constant-output adjustable mixing device to which the second chamber is connected via a non-return valve may also be embodied in many different ways, some of which may be known, outside the one illustrated. Even the illustrated mixer lends itself to many different modifications as will readily occur to those conversant with the art.
  • this drum could be locked against rotation therein, and in this case the stem 10 of control knob 11 is connected to the perforated disc 4 adapted to rotate in the bore of body 1.
  • the distributor chambers 12 and 13 and the holes 6a, 6b of wall element 4 of mixing chamber 3 could be caused to engage each other along a cylindrical interface; in this case, the distributor chambers 12 and 13 may be formed either in a central cylindrical member or in an annular member surrounding said central member, and the adjustment rotation may be imparted either to said central member or to the annular member surrounding same.
  • the number, dimensions and relative arrangement of the holes 60, 6b and the arrangement and dimensions of the distributor chambers, 12 and 13 are also optional. Instead of being of rotational character, the relation movement produced between the members in which said distributor chambers and the holes of the wall element of the mixing chamber may be obtained for example by producing a movement of translation.
  • the valve inserted in the oxygen intake connecting the adjustable mixing device to the first chamber may be of one among many different and possibly known types outside the type illustrated, so that the properly pulsated pressure of a fluid is used more or less directly for controlling the closing and opening movements of the valve member.
  • the proportioning device of this invention is particularly suited for artificial respiratory apparatus designed for long service periods, notably for new-born children.
  • a device connectable to atmospheric air and a pulsated stream of another gas for generating a pulsated stream of a proportioned mixture of atmospheric air and another gas which comprises a first chamber having an inlet for receiving the pulsated stream of said other gas; a second chamber having an inner volume variable between a maximum and a minimum value, and having an outlet; means sensitive to the increasing pressure in said first chamber for decreasing the volume of said second chamber to its minimum value, means for restoring said second chamber volume to its maximum value when the pressure in said first chamber has decreased; a mixing chamber having a first inlet for the atmospheric air, a second inlet for said other gas, and an outlet; means coacting with said first and second inlets for adjusting the ratio of the volumes of air and said other gas admitted in said mixing chamber; a first passage inserted between said second inlet and said first chamber; a normally open valve inserted in said first passage; pressure sensitive valve closing means influenced by the pressure of the pulsated stream of said other gas to close said valve; a second passage inserted between
  • said mixing chamber has a wall consisting of a perforated plate with at least one row of small holes of same dimensions and disposed at regular intervals defined therein, said holes being aligned in a predetermined direction; and said air-gas ratio adjusting means further comprises a movable body having one face in fluid-tight contact with the face of said plate which is opposite to said mixing chamber, first and second elongated cavities being formed in said one face of said body, said cavities having a same extent in said direction and opening into the small holes of said plate, passages being formed in said body for connecting the atmospheric air inlet and the other gas inlet to said first and second cavities respectively, and means for moving said body and said plate in relation to each other, from a first end position, in which none of the holes of said plate register with said first cavity, and a plurality of holes register with said second cavity, to a second end position, in which none of said holes register with said second cavity, and a plurality of holes register with said first cavity;
  • said pressure sensitive means for decreasing the volume of the second chamber consists of a bellows suspended in said first chamber, and said means for restoring said second chamber volume to its maximum value consists of a weight attached to the lower portion of said bellows, said second chamber consisting of the inside volume of said bellows.

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  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Pulmonology (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (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)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
US00263772A 1971-06-22 1972-06-19 Air-gas mixture metering device, notably for respiratory mask Expired - Lifetime US3830257A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR717122657A FR2142628B1 (sv) 1971-06-22 1971-06-22

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US (1) US3830257A (sv)
DE (1) DE2229468C2 (sv)
FR (1) FR2142628B1 (sv)
GB (1) GB1362744A (sv)
IT (1) IT959191B (sv)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4054133A (en) * 1976-03-29 1977-10-18 The Bendix Corporation Control for a demand cannula
US4121580A (en) * 1977-02-07 1978-10-24 Robertshaw Controls Company Squeeze bag resuscitator with air-oxygen proportionating control
US4475573A (en) * 1983-05-09 1984-10-09 Sterling Faucet Co. Hot and cold mixing valve for feeding a shower head, bath tub or the like
US4609007A (en) * 1983-10-27 1986-09-02 Sterling Faucet Company Mixing valve for connection to hot and cold water supply lines for feeding a variably proportioned mixture of hot and cold water to a shower head or the like
US4699173A (en) * 1985-05-14 1987-10-13 Dragerwerk Ag Mixing and proportioning device for flowing media
US4702240A (en) * 1986-07-22 1987-10-27 Bear Medical Systems, Inc. Demand-responsive gas blending system for medical ventilator
US4848333A (en) * 1986-12-09 1989-07-18 Waite & Co. Pty. Limited Oxygen dilution apparatus
EP0553128A1 (en) * 1990-10-15 1993-08-04 Bird Products Corp AMBIENT AIR AND PRESSURE OXYGEN MIXER.
US5372129A (en) * 1992-06-23 1994-12-13 Ryder; Steven L. Oxygen dilution device for maintaining an essentially constant proportion of primary gas in a diluent gas
US5746199A (en) * 1996-08-21 1998-05-05 Bayron; Harry Respiratory valve
US6186143B1 (en) * 1996-06-19 2001-02-13 Siemens Elma Ab Apparatus for supplying atmospheric air and at least one additional gas to a respirating subject
US6647983B2 (en) * 2000-03-17 2003-11-18 The Johns Hopkins University Low-pressure valve
US6718979B1 (en) * 2000-06-05 2004-04-13 Dhd Healthcare Corporation Oxygen mask assembly
FR2852852A1 (fr) * 2003-03-24 2004-10-01 Saime Sarl Dispositif d'aide a la respiration
US20070227541A1 (en) * 2003-11-07 2007-10-04 Erik Van den Akker Hyperoxic breathing system
US7448594B2 (en) 2004-10-21 2008-11-11 Ameriflo, Inc. Fluid regulator
US7617826B1 (en) 2004-02-26 2009-11-17 Ameriflo, Inc. Conserver
US8146592B2 (en) 2004-02-26 2012-04-03 Ameriflo, Inc. Method and apparatus for regulating fluid flow or conserving fluid flow
CN104090593A (zh) * 2014-06-30 2014-10-08 深圳市科曼医疗设备有限公司 气体浓度控制装置
US20170284141A1 (en) * 2016-03-30 2017-10-05 Ford Global Technologies, Llc Bellows spring damper
US11434009B2 (en) * 2017-12-20 2022-09-06 Airbus Operations Gmbh System for providing oxygen to oxygen masks in an aircraft

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2521030A1 (fr) * 1982-02-05 1983-08-12 Carboxyque Francaise Generateur d'air enrichi en oxygene
FR2645027B1 (fr) * 1989-04-03 1992-04-17 Carburos Metalicos Sa Se De Debitmetre pour l'administration d'oxygene
DE19727640C2 (de) * 1997-06-28 2000-01-20 Sanitaets Und Gesundheitshaus Anordnung zur Versorgung von Personen mit Atemgas

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA604704A (en) * 1960-09-06 Air-Shields Driving apparatus for lung ventilators
US2969789A (en) * 1956-03-23 1961-01-31 Morch Ernst Trier Respirator
US3045668A (en) * 1959-01-20 1962-07-24 Invengineering Inc Intermittent positive pressure respirator
US3068857A (en) * 1958-11-19 1962-12-18 British Oxygen Co Ltd Apparatus for controlling or assisting respiration
US3429326A (en) * 1966-01-19 1969-02-25 Aga Ab Breathing apparatus for supplying a pair of gases in adjustable proportion
US3537450A (en) * 1966-06-30 1970-11-03 Cape Eng Co Ltd Device for administering a gas to a patient
US3605785A (en) * 1968-06-15 1971-09-20 Draegerwerk Ag Apparatus for mixing gases in a predetermined ratio particularly for respiratory and medical purpoes
US3664361A (en) * 1970-08-24 1972-05-23 Puritan Bennett Corp Respiration system

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Publication number Priority date Publication date Assignee Title
US3530856A (en) * 1967-02-28 1970-09-29 Bird F M Mechanical volume limiting ventilator

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA604704A (en) * 1960-09-06 Air-Shields Driving apparatus for lung ventilators
US2969789A (en) * 1956-03-23 1961-01-31 Morch Ernst Trier Respirator
US3068857A (en) * 1958-11-19 1962-12-18 British Oxygen Co Ltd Apparatus for controlling or assisting respiration
US3045668A (en) * 1959-01-20 1962-07-24 Invengineering Inc Intermittent positive pressure respirator
US3429326A (en) * 1966-01-19 1969-02-25 Aga Ab Breathing apparatus for supplying a pair of gases in adjustable proportion
US3537450A (en) * 1966-06-30 1970-11-03 Cape Eng Co Ltd Device for administering a gas to a patient
US3605785A (en) * 1968-06-15 1971-09-20 Draegerwerk Ag Apparatus for mixing gases in a predetermined ratio particularly for respiratory and medical purpoes
US3664361A (en) * 1970-08-24 1972-05-23 Puritan Bennett Corp Respiration system

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4054133A (en) * 1976-03-29 1977-10-18 The Bendix Corporation Control for a demand cannula
US4121580A (en) * 1977-02-07 1978-10-24 Robertshaw Controls Company Squeeze bag resuscitator with air-oxygen proportionating control
US4475573A (en) * 1983-05-09 1984-10-09 Sterling Faucet Co. Hot and cold mixing valve for feeding a shower head, bath tub or the like
US4609007A (en) * 1983-10-27 1986-09-02 Sterling Faucet Company Mixing valve for connection to hot and cold water supply lines for feeding a variably proportioned mixture of hot and cold water to a shower head or the like
US4699173A (en) * 1985-05-14 1987-10-13 Dragerwerk Ag Mixing and proportioning device for flowing media
US4702240A (en) * 1986-07-22 1987-10-27 Bear Medical Systems, Inc. Demand-responsive gas blending system for medical ventilator
US4848333A (en) * 1986-12-09 1989-07-18 Waite & Co. Pty. Limited Oxygen dilution apparatus
EP0553128A1 (en) * 1990-10-15 1993-08-04 Bird Products Corp AMBIENT AIR AND PRESSURE OXYGEN MIXER.
EP0553128A4 (en) * 1990-10-15 1993-09-15 Bird Products Corporation Ambient pressure air/oxygen blender
US5372129A (en) * 1992-06-23 1994-12-13 Ryder; Steven L. Oxygen dilution device for maintaining an essentially constant proportion of primary gas in a diluent gas
US6186143B1 (en) * 1996-06-19 2001-02-13 Siemens Elma Ab Apparatus for supplying atmospheric air and at least one additional gas to a respirating subject
US5746199A (en) * 1996-08-21 1998-05-05 Bayron; Harry Respiratory valve
US6647983B2 (en) * 2000-03-17 2003-11-18 The Johns Hopkins University Low-pressure valve
US6718979B1 (en) * 2000-06-05 2004-04-13 Dhd Healthcare Corporation Oxygen mask assembly
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Also Published As

Publication number Publication date
GB1362744A (en) 1974-08-07
FR2142628A1 (sv) 1973-02-02
DE2229468A1 (de) 1973-01-11
DE2229468C2 (de) 1982-02-18
FR2142628B1 (sv) 1973-05-25
IT959191B (it) 1973-11-10

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