[go: up one dir, main page]

WO1991006335A1 - Soupape pneumatique a oxygene actionnee par la demande - Google Patents

Soupape pneumatique a oxygene actionnee par la demande Download PDF

Info

Publication number
WO1991006335A1
WO1991006335A1 PCT/US1989/004900 US8904900W WO9106335A1 WO 1991006335 A1 WO1991006335 A1 WO 1991006335A1 US 8904900 W US8904900 W US 8904900W WO 9106335 A1 WO9106335 A1 WO 9106335A1
Authority
WO
WIPO (PCT)
Prior art keywords
diaphragm
sensing
slave
gas
flow
Prior art date
Application number
PCT/US1989/004900
Other languages
English (en)
Inventor
William Carter
Original Assignee
Puritan-Bennett
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 Puritan-Bennett filed Critical Puritan-Bennett
Priority to PCT/US1989/004900 priority Critical patent/WO1991006335A1/fr
Publication of WO1991006335A1 publication Critical patent/WO1991006335A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B9/00—Component parts for respiratory or breathing apparatus
    • A62B9/02—Valves
    • A62B9/022—Breathing demand regulators
    • A62B9/027—Breathing demand regulators pilot operated, i.e. controlled by valve means sensitive to a reduced downstream pressure
    • 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
    • A61M16/08—Bellows; Connecting tubes ; Water traps; Patient circuits
    • A61M16/0816—Joints or connectors
    • A61M16/0841—Joints or connectors for sampling
    • A61M16/0858—Pressure sampling ports
    • 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
    • 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
    • A61M16/0003—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
    • A61M2016/0021—Accessories therefor, e.g. sensors, vibrators, negative pressure inhalation detectors electrical with a proportional output signal, e.g. from a thermistor

Definitions

  • the present invention is broadly concerned with a demand-type pneumatic valve particularly adapted for administering medicinal gas, normally oxygen, to a patient undergoing respiratory therapy. More particularly, it is concerned with a compact,
  • a medicinal gas such as oxygen
  • a source of pressurized gas with the gas being administered on a more or less continuous basis.
  • oxygen how ⁇ ever, studies have indicated that, in the continuous administration mode, significant quantities of oxygen are lost. That is to say, during the normal breathing cycle, the patient will inhale, exhale and pause before beginning the next inhalation; as a consequence, oxygen delivered to the patient during the exhale and pause portions of the breathing cycle
  • valves of the so-Coiled demand type i.e, valves adapted to open only during the inspiration period of the patient's breathing
  • the Myers valve makes use of a sensing diaphragm arrangement made up of a pair of inter-
  • the Myers device includes a rather complicated arrangement associated with the dual diaphragm structure de ⁇ signed to prevent the wastage of control volumes of gas, which typically may account for only 4 or 5% of the volume of gas used. As a consequence, the Myers design is inherently costly, and is believed prone to malfunction because of the inability to precisely respond to the changing pressure conditions induced during the patient's breathing cycle.
  • the demand valve of the invention over ⁇ comes the noted difficulties and provides a greatly improved pneumatic demand valve designed for coup ⁇ ling between a source of pressurized gas, such as oxygen, and a breathing gas recipient, in order to supply gas to the recipient as needed on a demand basis.
  • the demand valve broadly includes a body presenting a gas flow passageway therethrough having an inlet adapted for connection to the gas source and an outlet adapted for connection to the recipi ⁇ ent.
  • the valve body further has an internal sensing chamber having a port adapted for coupling to the recipient for transmission of the changing pressure conditions induced by the recipient's breathing to the sensing chamber.
  • a dual lumen cannula is coupled to the device of the invention, with one of the lumen being a gas supply passageway for delivering quantities of oxygen on a demand basis.
  • the remaining lumen is connected to the aforementioned sensing chamber port and leads to the nasal cavities of the patient, whereby to transmit to the sensing chamber the patient-induced pressure variations attendant to normal breathing.
  • the demand valve also includes sensing means in the form of only a single shiftable dia ⁇ phragm operatively disposed in and forming a part of the sensing chamber and shiftable between a position corresponding to inhalation by the recipient, and a position corresponding to exhalation by the reci ⁇ pient. Such shifting is in response to the pressure conditions within the sensing chamber induced by the recipient's breathing and transmitted through the aforementioned cannula lumen.
  • the overall demand valve further includes a slave diaphragm operably interposed in the gas flow passageway and movable between a gas flow- blocking position and a gas flow-permitting posi ⁇ tion.
  • the slave diaphragm engages an adjacent seat forming a part of the gas flow passageway through the body, and re ⁇ sists the forces exerted thereagainst by the pres ⁇ surized gas.
  • the valve includes means opera ⁇ tively coupling the sensing diaphragm and the slave diaphragm for movement of the slave diaphragm from the flow-blocking position thereof to its flow- permitting position, in response to shifting of the sensing diaphragm from the exhalation to the inhala- tion positions thereof.
  • the coup ⁇ ling means provides for movement of the slave dia ⁇ phragm from the flow-permitting to the flow-blocking positions thereof in response to shifting of the
  • This diaphragm coupling means preferably includes a port separate from the patient outlet and leading to the atmosphere for passage of pressurized gas from the region adjacent the other
  • spring means is provided for engaging the slave diaphragm and biasing the same in a preselected direction.
  • the relief passageway is provided for communicating the adjacent faces of the sensing and slave diaphragms
  • the ratio between the effective area of the sensing diaphragm, and the effective area presented by the relief passageway seat is at least about 5 35,000 to 1. This relatively large ratio is af ⁇ forded by precision drilling of the appropriate relief passageway in the valve body, and makes it possible to significantly reduce the size of the overall valve while at the same time enhancing the ratio
  • the sensiti ⁇ vity of the valve apparatus refers to the pressure level required in the sensing cavity of the valve to induce movement of the sensing and slave diaphragms from a flow-preventing to a flow-permitting posi-
  • Figure 1 is an elevational view with parts cut away showing a complete demand valve/flow con ⁇ troller in accordance with the invention, with a dual lumen cannula operatively coupled to the valve/ flow controller apparatus;
  • Fig. 2 is a fragmentary, enlarged view in vertical section illustrating the internal construc ⁇ tion of the preferred demand valve
  • Fig. 3 is an essentially schematic, verti ⁇ cal sectional view depicting the preferred demand valve device, shown during exhalation;
  • Fig. 4 is a view similar to that of Fig. 3, but showing the operation of the demand valve during inhalation;
  • Fig. 5 is an essentially schematic, verti ⁇ cal sectional view illustrating another embodiment of the demand valve of the invention, shown during the exhalation phase of operation thereof;
  • Fig. 6 is a view similar to that of Fig. 5, but showing the operation of the demand valve during inhalation.
  • the device 10 is in the form of a combined demand valve/flow controller unit 12 having a demand valve 14 operatively coupled with a selectable, multiple orifice flow controller 16.
  • the demand valve includes an inlet 18 adapted for connection to a source of oxygen or other medicinal gas, illu ⁇ strated by arrow 20.
  • Valve 14 also has a sensing port 22 which is important for reasons to be des- cribed.
  • the flow controller 16 on the other hand is of conventional construction and includes a gas outlet 24 adapted to supply gas to a recipient.
  • the overall assist apparatus 10 further includes a dual lumen cannula 26 having a pair of elongated flexible tubes in the form of a gas supply tube 28 and a sensing tube 30.
  • the gas supply tube 28 is operatively connected to outlet 24 as shown, and, adjacent the recipient, divides at juncture 32 to present two branch legs 34, 36.
  • the latter are interconnected by means of a nasal delivery struc ⁇ ture 38 including a pair of spaced apart gas deliv ⁇ ery tubes 40 respectively insertable into the pa ⁇ tient's nasal cavities.
  • the sensing tube 30 is operatively coupled to port 22 as depicted, and, adjacent the recipient, divides at juncture 41 to present two branch legs 41a and 41b; these legs are in turn connected to structure 38 as shown.
  • a pair of short sensing tubes 42 are respectively located within the spaced delivery tubes 40 as shown, and these are coupled with the legs 41a, 41b.
  • the function of sensing tube 30 is to convey and trans ⁇ mit, via the tubes 42 and the remainder of the tube body, the pressure conditions induced during the patient's breathing efforts, such pressure condi ⁇ tions being transmitted to port 22.
  • the valve 14 includes interconnected upper, intermediate and lower body components re ⁇ spectively numbered 44, 46 and 48.
  • the components 44, 46, 48 are interconnected by means of screws 50 or other appropriate fasteners, in order to present a complete valve housing.
  • the upper body component 44 is in the form of a substan- tially planar, circular in plan plate 52 presenting a lower chamber-defining wall surface 53 and a central, internal, depending stop 54.
  • the righthand edge of plate 52 as shown in Fig. 2 is bored for reception of the elongated tubular port 22.
  • Intermediate body component 46 is designed to mate with upper component 44, and accordingly includes an upper wall surface 56 which, in conjunc ⁇ tion with lower wall surface 53 of component 44, defines an internal recess 58.
  • the intermediate component 46 includes a circular, essentially square in cross-section channel 60 in surrounding relationship to recess 58.
  • a sensing diaphragm 62 is located within recess 58 and is in the form of a circular, unbiased elastomeric body having a central reinforcing ele ⁇ ment therewithin, a downwardly extending, semicircu ⁇ lar in cross-section, integral bead 66, and an essentially square in cross-section outermost peri ⁇ pheral connection rib 68. As illustrated, rib 68 is seated within channel 60, and the complete diaphragm 62 is maintained in position by virtue of the inter ⁇ connection of the components 44, 46, serving to retain the peripheral connection bead 66.
  • the sensing diaphragm 62 in effect divides overall recess 58 into an upper sensing chamber 70 and a lower relief passageway 72.
  • the port 22 is in communication with sensing chamber 70, whereas body component 44 is bored as at 74 to present an outlet or relief port communicating with passageway 72 and the atmosphere.
  • the intermediate body portion 46 is fur ⁇ ther provided with a central, stepped bore 76.
  • T ? bore 76 presents a lowermost, radially expanded section 78, an upright spring-receiving section 80, and an uppermost section 82 presenting a bore o ⁇ therethrough.
  • An axially bored member 84 is seated within bore 83, with the bore 86 therethrough termi ⁇ nating in an uppermost restricted seat portion 88.
  • inter ⁇ mediate body portion 46 is provided with an angled bore 90 leading from expanded section 78 to the lower wall surface 92 presented by body component 46.
  • the terminus of bore 90 is radially outwardly spaced from the expanded lower section 78 of bore 76, for reasons to be described.
  • the lower body component 48 includes an upper wall surface 94, an opposed lower surface 96, and a depending circular flange 98.
  • the flange 98 is adapted to interfit with the upper end of flow controller 16 and to be connected thereto by means of fasteners 100.
  • the lower body component is provided with an inlet bore 102 adapted to receive the inlet tube 18.
  • the inlet bore 102 in turn communicates with an upright, circular in cross-section pressurized gas chamber 104 which aligns with radially expanded section 78 of intermediate body component 44 as illustrated.
  • An angled pilot bore 106 extends radially outwardly from the gas chamber 104 and terminates in opposed relationship to the end of bore 90 provided in intermediate body component 44.
  • the upper wall surface 94 is relieved as at 108 and receives an O-ring 110 as well as an apertured metallic disc 112. In this fashion, compression of the body components 46, 48 serves to create a seal and hence a continuous gas flow passageway between chamber 104 and the expanded section of bore 76; the importance of the feature will be explained herein ⁇ after.
  • the slave diaphragm 114 is situated atop and defines the upper surface of gas flow chamber 104.
  • the diaphragm 114 includes an upstanding semicircular in cross-section marginal bead and is of elastomeric construction.
  • the diaphragm 114 further is held in place by compression between the adjacent surfaces of body components 44, 46, and for this purpose, upper surface 94 of lower body compon ⁇ ent 48 is appropriately relieved as at 95 to receive the outermost marginal edge of the diaphragm 114.
  • a metallic actuator body 116 is in engage ⁇ ment with the upper surface of diaphragm 114 and includes an upright central section.
  • a biasing spring 118 receiving the central section of the body 116 is interposed between the latter and the upper portion of body component 44 defining the aperture 82. This serves to bias diaphragm 114 downwardly as will be readily apparent.
  • the lower body component 48 has an inner ⁇ most, central, upstanding, annular wall 120 which defines a central gas flow path 122 and an uppermost diaphragm seat 124 of reduced cross-sectional dimen ⁇ sions.
  • diaphragm 114 serves as the uppermost wall of gas chamber 104.
  • This diaphragm also serves as the bottom or lower wall of a biasing chamber 125 defined by the stepped bore 76 and the diaphragm itself.
  • the flow controller 16 is of entirely conventional design and provides a selector (not shown) for selecting any one of a number of differ ⁇ ently sized, fixed dimension orifices which serve to deliver to the patient fixed rates of gas flow, e.g., 2, 4 or 6 liters per minute.
  • the demand valve 14 presents a continuous gas flow passageway from the source of pressurized gas to the patient outlet.
  • this passage- way (see Fig. 3) is defined by the inlet 18, chamber 104 and flow path 122 leading to the flow controller 16 and ultimately outlet 24.
  • Slave diaphragm 114 is operably interposed in this flow passageway, namely by engagement with the uppermost end of annular wall 120.
  • the sensing diaphragm 62 is pneumat ⁇ ically coupled with the slave diaphragm 114 for operation of the latter in response to operation of the sensing diaphragm.
  • schema ⁇ tic Figs. 3 and 4 respectively show operation of the valve during exhalation and inhalation.
  • sensing diaphragm 62 is in engagement with the seat portion 88 of bore 86 thereby effecting a seal between biasing chamber 125 and relief passageway 72.
  • the diaphragm 114 is retained in its sealing orientation by virtue of two factors, namely passage of gas from chamber 104 through the bores 90, 106 (shown for purposes of simplification in Figs.
  • the biasing gas within chamber 125 passes into the passageway 72 and is immediately exhausted to the atmosphere through communicating passageway 74.
  • the pressure within chamber 104 is suffi ⁇ cient to raise slave diaphragm 114 from seat 124, thereby opening the gas flow passageway through the valve and permitting gas to travel from chamber 104 through flow path 122 and into flow controller 16.
  • the flow controller 16 is of conventional design and includes selectable fixed orifice means schematically referred to by the throat 128; the flow controller creates, during inhalation, a fixed back pressure within the demand valve downstream of slave diaphragm 114.
  • Figs. 5 and 6 illustrate another embodi ⁇ ment in accordance with the invention which is in many respects identical with that shown in Figs. 3 and 4, and accordingly the same reference numerals are employed where appropriate, except with a letter designation "a".
  • the principal difference between the embodiment of Figs. 5 and 6 as compared with the preferred embodiment is that in the second embodi ⁇ ment the flow controller device 16a is upstream of the demand valve 14a.
  • the oxygen supply referred to by the arrow 20a first passes through the fixed throat 128a of the flow controller and thence into the path 122a of demand valve 14a.
  • valve 14a is different in that the slave diaphragm 114a is inverted as compared with the embodiment of Figs. 3-4, i.e., the marginal bead thereof opens upwardly as opposed to downwardly. Furthermore, the equalization orifice 90/106a is located in the
  • ⁇ c within sensing chamber 70a maintain diaphragm 62a in engagement with seat 88a.
  • pres ⁇ surized gas is located within path 122a and biasing chamber 125a by virtue of pilot orifice 90/106a or its equivalent. This serves to maintain slave dia ⁇ phragm 114a in engagement with seat 124a to prevent
  • sensing chamber 70a When the patient inspires, the negative pressure within sensing chamber 70a causes diaphragm 62a to lift, whereby biasing gas within chamber 125a passes into passageway 72a and ultimately to the
  • the slave diaphragm in response to movement of the sensing diaphragm; the latter is in turn moved in response to the patient's breathing efforts as transmitted through the cannula.
  • a fail safe demand device is one that, upon a mechanical failure of one or more components, establishes a continuous flow of oxygen to be de ⁇ livered to the recipient at the prescribed rate.

Landscapes

  • Health & Medical Sciences (AREA)
  • Pulmonology (AREA)
  • Emergency Medicine (AREA)
  • General Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Otolaryngology (AREA)
  • Emergency Management (AREA)
  • Business, Economics & Management (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)

Abstract

On décrit une soupape (14) actionnée par la demande, totalement pneumatique, simplifiée et à faible encombrement servant à relier une source de gaz pressurisé à un utilisateur récepteur. Ladite soupape présente un degré élevé de sensibilité et de réglage de l'écoulement sans recours aux configurations de soupape volumineuses et coûteuses qui sont caractéristiques des soupapes actionnées par la demande précédentes. De préférence, ladite soupape (14) comporte un corps de soupape possédant un passage d'écoulement de gaz associé à des membranes de détection (62) et auxiliaire (114). La membrane auxiliaire (114) est disposé dans le passage de gaz et empêche l'écoulement du gaz pendant les phases d'exhalation du cycle ventilatoire du malade. Pendant l'inhalation détectée par la membrane de détection (62), la membrane auxiliaire (114) est déplacée afin de dégager ledit passage dans la soupape (14) et de permettre l'écoulement de gaz vers le malade. La soupape (14) est destinée à être couplée à un dispositif de limitation du débit (16) à orifice fixe et pouvant être disposé soit en aval de la soupape soit en amont de celle-ci.
PCT/US1989/004900 1989-11-01 1989-11-01 Soupape pneumatique a oxygene actionnee par la demande WO1991006335A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US1989/004900 WO1991006335A1 (fr) 1989-11-01 1989-11-01 Soupape pneumatique a oxygene actionnee par la demande

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1989/004900 WO1991006335A1 (fr) 1989-11-01 1989-11-01 Soupape pneumatique a oxygene actionnee par la demande

Publications (1)

Publication Number Publication Date
WO1991006335A1 true WO1991006335A1 (fr) 1991-05-16

Family

ID=22215341

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1989/004900 WO1991006335A1 (fr) 1989-11-01 1989-11-01 Soupape pneumatique a oxygene actionnee par la demande

Country Status (1)

Country Link
WO (1) WO1991006335A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997041812A1 (fr) * 1996-05-08 1997-11-13 Resmed Limited Commande de la pression de distribution dans le traitement par ventilation spontanee avec pression respiratoire positive ou la respiration assistee
US6550493B2 (en) 2001-06-13 2003-04-22 Baxter International Inc. Vacuum demand valve
US6554023B2 (en) 2001-06-13 2003-04-29 Baxter International Inc. Vacuum demand flow valve
USD499793S1 (en) 2003-03-17 2004-12-14 Baxter International Inc. Valve
US6863261B2 (en) 2002-03-12 2005-03-08 Baxter International Inc. Valve stop
USD507631S1 (en) 2003-03-17 2005-07-19 Baxter International Inc. Valve
CN107661561A (zh) * 2017-10-27 2018-02-06 成都忆氧源科技有限公司 一种呼吸脉冲阀

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2318827A (en) * 1941-03-03 1943-05-11 Mine Safety Appliances Co Valve
US2552595A (en) * 1948-09-21 1951-05-15 Seeler Henry Oxygen demand breathing system, including means for automatic altitude regulation
US3285261A (en) * 1962-12-21 1966-11-15 Robertshaw Controls Co Breathing demand regulator
US4054133A (en) * 1976-03-29 1977-10-18 The Bendix Corporation Control for a demand cannula
US4575042A (en) * 1984-08-17 1986-03-11 Associates Of Dallas Pneumatically amplified conservation valve
WO1987002590A1 (fr) * 1985-11-05 1987-05-07 Shattuck, Leonard, L. Regulateur de la respiration a ecoulement positif sensible a la demande

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2318827A (en) * 1941-03-03 1943-05-11 Mine Safety Appliances Co Valve
US2552595A (en) * 1948-09-21 1951-05-15 Seeler Henry Oxygen demand breathing system, including means for automatic altitude regulation
US3285261A (en) * 1962-12-21 1966-11-15 Robertshaw Controls Co Breathing demand regulator
US4054133A (en) * 1976-03-29 1977-10-18 The Bendix Corporation Control for a demand cannula
US4575042A (en) * 1984-08-17 1986-03-11 Associates Of Dallas Pneumatically amplified conservation valve
WO1987002590A1 (fr) * 1985-11-05 1987-05-07 Shattuck, Leonard, L. Regulateur de la respiration a ecoulement positif sensible a la demande

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997041812A1 (fr) * 1996-05-08 1997-11-13 Resmed Limited Commande de la pression de distribution dans le traitement par ventilation spontanee avec pression respiratoire positive ou la respiration assistee
US6679288B2 (en) 2001-06-13 2004-01-20 Baker International Inc. Vacuum demand valve
US6554023B2 (en) 2001-06-13 2003-04-29 Baxter International Inc. Vacuum demand flow valve
US6604545B2 (en) 2001-06-13 2003-08-12 Baxter International Inc. Vacuum demand valve
US6648011B2 (en) 2001-06-13 2003-11-18 Baxter International Inc. Vacuum demand valve
US6672333B2 (en) 2001-06-13 2004-01-06 Baxter International Inc. Vacuum demand valve
US6550493B2 (en) 2001-06-13 2003-04-22 Baxter International Inc. Vacuum demand valve
US6684903B2 (en) 2001-06-13 2004-02-03 Baxter International Inc. Vacuum demand valve
US6712095B2 (en) 2001-06-13 2004-03-30 Baxter International Inc. Vacuum demand valve
US6863083B2 (en) 2001-06-13 2005-03-08 Baxter International Inc. Vacuum demand flow valve
US6863261B2 (en) 2002-03-12 2005-03-08 Baxter International Inc. Valve stop
USD499793S1 (en) 2003-03-17 2004-12-14 Baxter International Inc. Valve
USD507631S1 (en) 2003-03-17 2005-07-19 Baxter International Inc. Valve
CN107661561A (zh) * 2017-10-27 2018-02-06 成都忆氧源科技有限公司 一种呼吸脉冲阀

Similar Documents

Publication Publication Date Title
US5360000A (en) Pneumatic demand oxygen valve
US11344692B2 (en) Respiratory therapy systems and methods
US6378520B1 (en) Variable pressure and flow control for a pneumatically-operated gas demand apparatus
US3933171A (en) Anesthesia breathing circuit with positive end expiratory pressure valve
US7721735B2 (en) Portable gas powered positive pressure breathing apparatus and method
KR101524100B1 (ko) 호흡 가스 전달과 공유 시스템 및 방법
US6116242A (en) Oxygen-conserving regulator assembly
US4278110A (en) Demand responsive flow controller
US6237594B1 (en) Pneumatically-operated gas demand apparatus
US8230859B1 (en) Method and apparatus for regulating fluid
AU2019276585C1 (en) Pressure safety device for bag valve mask
US20080173304A1 (en) Pneumatic single-lumen medical gas conserver
US5787882A (en) Demand valve resuscitator
US8146592B2 (en) Method and apparatus for regulating fluid flow or conserving fluid flow
US6425396B1 (en) Sensing valve motion limiting mechanism for respiratory equipment
US10166360B2 (en) System and method for controlling flow during exhalation in a respiratory support system
JP2001521794A (ja) 酸素治療装置
JPS6125386B2 (fr)
EP1214112B1 (fr) Soupape d'alimentation et membrane destinees a un appareil d'alimentation en gaz a la demande a commande pneumatique
US5520170A (en) Automatic resuscitator
US20060124130A1 (en) Ventilation system for respiratory devices
JPS5836983B2 (ja) 呼吸装置の呼吸弁
US3995625A (en) Inhalation devices
WO1991006335A1 (fr) Soupape pneumatique a oxygene actionnee par la demande
US20020023648A1 (en) Gas pressure regulator incorporating flow meter

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AT AU BB BG BR CH DE DK FI GB HU JP KP KR LK LU MC MG MW NL NO RO SD SE SU

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE BF BJ CF CG CH CM DE FR GA GB IT LU ML MR NL SE SN TD TG

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642