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WO2006136784A1 - Traitement de gaz - Google Patents

Traitement de gaz Download PDF

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Publication number
WO2006136784A1
WO2006136784A1 PCT/GB2006/002146 GB2006002146W WO2006136784A1 WO 2006136784 A1 WO2006136784 A1 WO 2006136784A1 GB 2006002146 W GB2006002146 W GB 2006002146W WO 2006136784 A1 WO2006136784 A1 WO 2006136784A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
column
chosen
exhaust
mixture
Prior art date
Application number
PCT/GB2006/002146
Other languages
English (en)
Inventor
Robert Bruce Grant
Original Assignee
The Boc Group Plc
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 The Boc Group Plc filed Critical The Boc Group Plc
Publication of WO2006136784A1 publication Critical patent/WO2006136784A1/fr

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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. ventilators; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/025—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with wetted adsorbents; Chromatography
    • 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
    • A61M2202/00—Special media to be introduced, removed or treated
    • A61M2202/02—Gases
    • A61M2202/0291—Xenon
    • 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
    • A61M2230/00—Measuring parameters of the user
    • A61M2230/40—Respiratory characteristics
    • A61M2230/43—Composition of exhalation
    • A61M2230/437—Composition of exhalation the anaesthetic agent concentration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/10—Single element gases other than halogens
    • B01D2257/11—Noble gases

Definitions

  • the present invention relates to the treatment of gases, and in particular to the recovery of a chosen gas from a gas mixture.
  • the invention relates to the recovery of a noble gas such as xenon from a first gas mixture to form a second gas mixture.
  • Xenon has a number of medical uses, for example, as a clinical anaesthetic and as a neural protector.
  • a mixture of gases typically comprising helium, oxygen and xenon as the major constituents, is delivered to a patient.
  • the gas mixture usually contains around 20-30% Xe, around 20- 30% O 2 and around 40-60% He. He is generally used to reduce the density of the gas mixture to a level approximating the density of ambient air, and thereby enable the patient to breathe easily.
  • the present invention provides a method of recovering a chosen gas from a first gas mixture comprising a first plurality of components, one of which is the chosen gas, to form a second gas mixture comprising a second plurality of components, the method comprising the steps of supplying the first gas mixture to a gas chromatography column for separating the components of the gas mixture and sequentially exhausting the components therefrom; supplying to the column a carrier gas, the carrier gas being a component of the second gas mixture; collecting an exhaust gas comprising the carrier gas and the chosen gas exhaust from column; and controlling the supply of carrier gas to the column to control the relative amounts of carrier gas and chosen gas within the collected exhaust gas.
  • a gas chromatography column separates components of a gas mixture by virtue of the different speeds at which the components pass through the column.
  • the rate at which a component travels through a particular gas chromatography column is dependent upon a number of factors, most notably the chemical and physical properties of the component.
  • Relatively large noble gas molecules such as xenon and krypton diffuse through the packed bad of a gas chromatography column much slower than many other gas molecules.
  • components such as He, Ar, O 2 , N 2 , and CO 2 would diffuse through a gas chromatography column quicker than Xe and Kr. Consequently, one of the components of the first gas mixture can be chosen for isolation from the other components.
  • a carrier gas is supplied to the column to draw the components of the gas mixture from the column, and so when the chosen gas is exhaust from the column, it will be exhaust along with an amount of the carrier gas.
  • the carrier gas is selected as a ..component of the second gas mixture of which the chosen, gas, when separated from the other components of the first gas mixture, is to form part.
  • the first gas mixture is a gas exhaled by a patient and includes, for example, Xe, He, O 2 , and CO 2
  • the second gas mixture is a ventilation gas comprising Xe, He and O 2
  • a column receiving the exhaled gas can enable a gas mixture comprising Xe and He to be collected from the column and in the relative concentrations required for the ventilation gas.
  • the collected gas can then be blended with a controlled amount of O 2 to form the ventilation gas.
  • the supply of carrier gas to the column is controlled in response to data indicative of the relative amounts of carrier gas and chosen gas within the exhaust gas, that is, prior to its collection in a storage vessel or the like.
  • a sensor may be located between the outlet of the column and the inlet of a storage vessel for collecting the exhaust gas. This ' sensor may be configured to detect the concentration of the chosen gas within the exhaust gas, or to detect the density of the exhaust gas. In response to a signal output from the sensor, the supply of the carrier gas to the column can be adjusted.
  • the chosen gas is a noble gas such as xenon
  • it can take, for a given supply rate of carrier gas to the column, a period of at least 1 or 2 minutes for all of the noble gas to be exhaust from the column, and during which period the concentration of the noble gas within the exhaust gas will vary with time.
  • the amount of noble gas within the collected exhaust gas once all of the noble gas has been exhaust from the column can be rapidly predicted for the current carrier gas supply rate.
  • any adjustment to the rate at which the carrier gas is supplied to the column will have a rapid influence on the relative amounts of carrier gas and noble gas exhaust from the column, and thus on the relative amounts of carrier gas and noble gas collected in the storage vessel.
  • the supply of carrier gas to the column is controlled in response to data indicative of the relative amounts of carrier gas and chosen gas within the collected exhaust gas.
  • a sensor located in the storage vessel may be configured to detect the concentration of chosen gas within the collected exhaust gas, or to detect the density of the collected exhaust gas. In response to a signal output from the sensor, the supply of the carrier gas to the column can be adjusted.
  • the supply of carrier gas to the column can thus be controlled to maintain the ratio of carrier gas to chosen gas within the collected exhaust gas at or around a chosen level, or to maintain the density of the collected exhaust gas at or around a chosen level.
  • concentration of xenon within the exhaust gas will typically rise rapidly to a maximum, and then decrease with time until all of the xenon has been exhaust from the column.
  • the amount of xenon within the exhaust gas may be around 20 - 30% depending on the supply rate of carrier gas to the column.
  • the supply of carrier gas to the column can therefore be dynamically adjusted according to the variation of the concentration of the noble gas within the exhaust gas, for example by controlling a mass flow controller for controlling the rate of supply of carrier gas to the column, so that the collected exhaust gas contains the noble gas and the carrier gas in relatively constant proportions during the collection period.
  • the first gas mixture may be supplied to the column by an inlet system having a first inlet for receiving the first gas mixture, a second inlet for receiving the carrier gas ⁇ a . rid an outlet for supplying the first gas mixture entrained within the carrier gas to the column.
  • This inlet system may comprise a storage vessel for receiving the first gas mixture and storing the first gas mixture prior to supply to the column. "Batch processing" of the first gas mixture may then be performed.
  • the present invention finds particular use in the recovery of a noble gas such as xenon from a gas exhaled by the patient to form a ventilation gas, comprising xenon, helium and oxygen, for the patient. Therefore, in a second aspect the present invention provides a method of forming a ventilation gas for a patient, the ventilation gas comprising helium, oxygen and xenon, the method comprising the steps of receiving an exhaled gas from the patient, the exhaled gas comprising a plurality of components, one of which is xenon; supplying the exhaled gas to a gas chromatography column for separating the components of the exhaled gas and sequentially exhausting the components therefrom; supplying a helium carrier gas to the column; collecting a gas mixture comprising helium and xenon exhaust from column; and adding oxygen to the collected gas mixture to form the ventilation gas.
  • the supply oftielium carrier gas to the column can be controlled to - control the relative amounts of helium and xenon within
  • the present invention provides apparatus for recovering a chosen gas from a first gas mixture comprising a plurality of components, one of which is the chosen gas, to form a second gas mixture comprising a second plurality of components
  • the apparatus comprising a gas chromatography column for separating the components of the first gas mixture and sequentially exhausting the components therefrom, means for supplying to the column a carrier gas, the carrier gas being a component of the second gas mixture, means for collecting an exhaust gas comprising the carrier gas and the chosen gas exhaust from column; and means for controlling the supply of carrier gas to the column to control the relative amounts of carrier gas and chosen gas within the collected exhaust gas.
  • the present invention provides a system for supplying ventilation gas to a patient, the ventilation gas comprising helium, oxygen and xenon, the system comprising means for receiving an exhaled gas from the patient, the exhaled gas comprising a plurality of components, one of which is xenon, means for supplying the exhaled gas to a gas chromatography column for separating the components of the exhaled gas and sequentially exhausting the components therefrom; means for supplying helium to the column as a carrier gas, means for collecting a gas mixture comprising helium and xenon exhaust from column, and means for combining the collected gas mixture with oxygen to form the ventilation gas.
  • Figure 1 illustrates schematically an example of a system for supplying a ventilation gas to a patient
  • Figure 2 illustrates schematically a first example of a gas recovery system for use in the system of Figure 1 ;
  • Figure 3 illustrates the time taken for various different gases to be exhaust from the gas chromatography column of the gas recovery system of Figure 2;
  • Figure 4 illustrates schematically a second example of a gas recovery system.
  • the gas recovery system illustrated in the drawings is provided for use in recovering xenon contained within a gas exhaled by a ventilated patient to form a ventilation gas for the patient.
  • the invention is not limited to such a purpose.
  • Aspects of the invention also find use in the recovery of a noble gas from a gas exhaust from a processing chamber to which a gas mixture comprising the noble gas is supplied, for example, for lamp filling or the like.
  • the invention Whilst the examples described below relate to the recovery of xenon from a gas mixture, the invention is not restricted to the recovery of xenon.
  • the invention is also suitable for the recovery of other gases, such as krypton, a mixture of xenon and krypton, or any other gas.
  • the recovered gas mixture may be re-used "as is", or it may be mixed wit/i another gas prior to re-use.
  • the recovered gas mixture may be mixed with fresh oxygen or other gas prior to re-use.
  • the term "noble gas” used herein is not limited to a single gas, but also includes a mixture of two or more noble gases.
  • ⁇ ventilation system for supplying a ventilation gas comprising a mixture of oxygen, helium and xenon to a patient comprises a xenon supply 10 for supplying fresh xenon to a gas mixing vessel 12, a helium supply 14 for supplying fresh helium to the mixing vessel 12, and an oxygen supply 16 for supplying fresh oxygen to the mixing vessel 12.
  • the supply of these three gases to the mixing vessel 12 is controlled by a ventilation system controller using valves (or mass flow controllers) 18, 20, 22 respectively so that the three gases are supplied to the mixing vessel 12 in appropriate amounts for forming the ventilation gas.
  • the ventilation gas may comprise around 20% Xe, around 20% O 2 and around 60% He, although the relative amounts of these gases within the ventilation gas may be varied as required.
  • a separate gas conduit may be used to convey each gas to a respective inlet of the mixing vessel.
  • two or more of the gases may be supplied to a common gas conduit by which o _
  • ventilation gas conduit 24 conveyed by ventilation gas conduit 24 to a ventilator 26 or similar device for ventilating the lungs of a patient.
  • the exhaled gas exhaled by the patient will comprise a plurality of components, notably He, Xe and unconsumed O 2 from the ventilation gas, and CO 2 as a by-product of respiration.
  • the exhaled gas may also comprise N 2 and trace gases such as Ar. Due to the high cost of xenon, it is desirable to recover the xenon from the exhaled gas for return to the mixing vessel 12 for forming further ventilation gas.
  • an exhaled gas conduit 28 conveys an exhaled gas exhaled by the patient to a gas recovery system 30 for recovering the xenon from the exhaled gas to enable the recovered xenon to be recirculated back to the mixing vessel 12 for re-use.
  • a three- way valve may be located within the exhaled gas conduit 28 for selectively diverting the exhaled gas away from the gas recovery system 30.
  • a non- return valve may also be located within the exhaled gas conduit 28 to prevent back-streaming of gas from the gas recovery system 30 to the ventilator 26.
  • FIG. 2 A first example of a gas recovery system 30 for use with the system of Figure 1 is illustrated in more detail in Figure 2.
  • the gas recovery system 30 comprises an inlet system, indicated generally at 32, for receiving the exhaled gas output from the exhaled gas conduit 28.
  • the received exhaled gas is conveyed to an exhaled gas storage vessel 34 of the inlet system 32 for storing temporarily the exhaled gas.
  • the received exhaled gas may be compressed prior to storage within the storage vessel 34.
  • a conduit 36 of the inlet system 32 has a first inlet 38 connected to the outlet of the storage vessel 34, and a second inlet 40 for receiving a pressurised stream of inert gas (that is, a gas that is chemically inert to the exhaled gas) from a source 42 thereof.
  • the inert gas is chosen as a component of the ventilation gas to be formed using the xenon to be recovered from the exhaled gas.
  • the inert gas is helium.
  • the inert gas may be any other inert gas, such as helium, argon, neon, hydrogen, nitrogen and carbon dioxide.
  • a neon inert gas may be used.
  • the supply of the inert gas to the conduit 36 is controlled by a recovery system controller 44, which outputs signals 46 to a mass flow controller 48 to control the flow rate of inert gas into the conduit 36.
  • a valve 50 is provided within the conduit 36 between the first inlet 38 and the second inlet 40.
  • the valve 50 is normally in a closed position so that, as the exhaled gas is received by the inlet system 32, the storage vessel 34 gradually fills with exhaled gas.
  • the valve 50 is controlled by signals 52 output from the recovery system controller 44 so that when the storage vessel 34 is almost full, or following the expiry of a predetermined time period, the valve 50 is opened for a period of time so that the exhaled gas is injected into the stream of the inert gas entering the conduit 36 through the second inlet 40.
  • the outlet 54 of the conduit 36 is connected to an inlet of a heated gas chromatography column 56.
  • a gas chromatography column separates components of a gas mixture by virtue of the different speeds at which the components pass through the column.
  • the stream of inert gas entering the conduit 36 from the inert gas source 42 provides a carrier gas for carrying the components of the exhaled gas through the column 56.
  • Gas chromatography columns are well known in the art, and therefore will not be described in detail here. The rate at which a component of a gas mixture travels through a particular gas chromatography column is dependent upon a number of factors, including:
  • the factors that influence most greatly the separation of the components of the gas mixture entering the column 56 are the chemical and physical properties of the components.
  • Xenon molecules have a relatively large size in comparison to that of the other components of the gas mixture.
  • xenon is a large molecule having outer electron rings a relatively long distance from its nucleus, xenon has a high electron affinity, and so molecules of xenon tend to become temporarily held within the column under weak Van der Waals forces.
  • xenon diffuses through the packed bad of the column 56 much slower than many of the other components of the gas mixture.
  • He, Ar, O 2 , N 2 , and CO 2 would diffuse through the column 56 quicker than Xe.
  • the temperature and size of the column 56 are configured such that the other components pass out from the outlet 58 of the column 56 whilst the xenon is still retained within the column 56. These factors are preferably configured so that the size of the column 56 is minimised, and so that the time taken for the other components to be output from the column 56, and therefore the time taken to separate xenon from the other components of the exhaust gas mixture, is also minimised.
  • a heater 57 extends about at least part of the column 56. In normal use, the column 56 is heated to a temperature of around 200 0 C.
  • the components of the gas mixture will thus be sequentially exhausted from the outlet 58 of the column 56.
  • An optional gas sensor 60 such as an FID or thermal conductivity sensor, may be located proximate the outlet 58 of the column 56 to detect the components of the gas mixture as they are exhaust from the column 56. Signals 62 output from the gas sensor 60 may be conveyed to the recovery system controller 44 to provide a trace indicating the sequential exhaust of the components from the column 56. An example of such a trace is illustrated in Figure 3.
  • the gas exhaust from the column will comprise carrier gas (helium) alone, or a mixture of carrier gas and one or more components of the exhaled gas.
  • the gas exhaust from the outlet of the column 56 is conveyed to a three-way valve 64.
  • the position of the three-way valve 64 is controlled by signals 66 generated by the recovery system controller 44 in response to the signals 62 output from the gas sensor 60 so that when the "faster" components of the exhaled gas are being exhaust from the column 56, these gases are being vented to the atmosphere.
  • the position of the three-way valve 64 is controlled on a time basis from the opening of the valve 50, the length of this time period depending on the current flow rate of carrier gas into the column 56.
  • the position of the three-way valve 56 is switched by the recovery system controller 44 to direct the gas exhaust from the column 56 into an exhaust gas storage vessel 68.
  • the exhaust gas entering the storage vessel 68 will comprise a binary gas mixture of helium carrier gas and xenon, with the amount of xenon contained within the exhaust gas varying with time, as shown in Figure 3.
  • the gas collected within the storage vessel 68 thus comprises two of the three components of the ventilation gas supplied to the ventilator 26.
  • the supply of helium carrier gas to the column 56 is controlled so that the exhaust gas collected in the storage vessel 68 contains the relative amounts of helium and xenon required for the ventilation gas.
  • the supply of helium carrier gas to the column 56 is controlled so that the exhaust gas collected in the storage vessel contains xenon and helium in the ratio of 1 :3.
  • a second gas sensor 70 is provided for detecting the concentration of xenon within the exhaust gas conveyed from the three-way sensor 64 to the storage vessel 68 by conduit 72.
  • the gas sensor 70 may be a thermal conductivity sensor, or an acoustic sensor.
  • the concentration of xenon within the exhaust gas will vary with time as the xenon is exhaust from the column 56.
  • the xenon concentration typically rises rapidly to a peak of around 20-30% Xe in He (depending on the supply rate of carrier gas to the column 56), and then gradually decreases with time until all of the xenon has been exhaust from the column 56.
  • signals 74 output from the gas sensor 70 indicative of #ie current concentration of the xenon in the exhaust gas .
  • the recovery system controller 44 can determine the current ratio of Xe. ⁇ e in the storage vessel 68, and may output signals to the mass flow controller 48 to adjust the supply rate of helium into the inlet system 32 so that the ratio of xenon to helium in the storage vessel 70 once all of the xenon has been exhausted from the column 56 is at the required value. Due to the much faster speed at which helium travels through the column 56 in comparison to xenon, any adjustment to the rate at which the helium is supplied to the column 56 from the inert gas source 42 will have a rapid influence on the concentration of xenon in the exhaust gas, and thus on the relative amounts of helium and xenon collected in the storage vessel 68.
  • the supply rate of helium carrier gas to the column 56 can be varied in a number of different ways to achieve the required ratio of xenon to helium in the storage vessel 70 once all of the xenon has been exhausted from the column 56.
  • the helium supply rate may be gradually decreased as the concentration of xenon in the exhaust gas increases towards the maximum, and then gradually increased as the xenon concentration subsequently decreases.
  • the supply rate ⁇ of the helium carrier gas may be maintained at a constant rate up to the maximum xenon concentration in the exhaust gas.
  • the ratio of helium to xenon in the storage vessel 70 once all of the xenon has been exhausted from the column 56 can be predicted for the current helium supply rate.
  • the supply rate can then be increased or decreased as required for the remainder of the collection period to achieve the desired ratio of helium to xenon in the storage vessel 70 once all of the xenon has been exhausted from the column 56.
  • the supply of helium carrier gas to the column 56 may be controlled so that the exhaust gas collected in the storage vessel 68 has a density similar to that of nitrogen, for example 80% helium and 20% xenon, to minimise patient discomfort during breathing.
  • the gas sensor 70 may.be provided by a sensor for detecting the density of the exhaust gas within the conduit 72.
  • the recovery system controller 44 may then vary the helium supply rate to the column 56 in dependence on signals received from this sensor so that the exhaust gas collected in the storage vessel 68 once all of the xenon has been exhaust from the column 56 has the required density.
  • the recovery system controller 44 switches the position of the three-way valve 64 so that any further gas exhaust from the column is vented to the atmosphere. A further injection of exhaled gas may then be added to the stream of carrier gas by opening valve 50, and the above process repeated to recover the xenon from that injection of exhaled gas.
  • the binary gas mixture of helium and xenon collected in the storage vessel 70 can be returned to the mixing vessel 12 by conduit 76 for blending with fresh oxygen to form fresh ventilation gas for the patient.
  • the ventilation system controller uses valve (or mass flow controller) 78 to control the supply of the binary gas mixture to the mixing vesseM2, and controls valve 22 to add the required amount of oxygen to the binary gas mixture to form the ventilation gas.
  • the gas sensor 70 may be positioned such that the sensor detects the concentration of xenon within the exhaust gas collected within the storage vessel 68, or the density of the collected exhaust gas.
  • the recovery system controller 44 controls the mass flow controller 48 to adjust the supply rate of helium carrier gas to . the column 56 to control the relative amounts of helium and xenon within the collected exhaust gas.

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  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Public Health (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Anesthesiology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Veterinary Medicine (AREA)
  • Pulmonology (AREA)
  • Emergency Medicine (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

Un procédé de récupération d'un gaz noble à partir d'un premier mélange gazeux comprend une pluralité de composants et consiste à acheminer ce premier mélange vers une colonne de chromatographie de gaz afin de séparer les composants du mélange et d'en éliminer séquentiellement les composants; à doter la colonne d'un gaz vecteur afin d'extraire le gaz noble de la colonne; à recueillir un gaz d'échappement provenant de la colonne qui comprend le gaz vecteur et le gaz noble; et à surveiller l'acheminement de gaz vecteur vers la colonne afin de régler les quantités relatives de gaz vecteur et de gaz noble dans le gaz d'échappement recueilli. Ce procédé trouve une application particulière dans la récupération de gaz noble à partir d'un mélange gazeux émanant d'un patient afin de former un gaz de ventilation comprenant à la fois le gaz noble et le gaz vecteur.
PCT/GB2006/002146 2005-06-21 2006-06-12 Traitement de gaz WO2006136784A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0512646.1A GB0512646D0 (en) 2005-06-21 2005-06-21 Treatment of gases
GB0512646.1 2005-06-21

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WO2006136784A1 true WO2006136784A1 (fr) 2006-12-28

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2033680A1 (fr) * 2007-09-10 2009-03-11 Hargasser, Stefan, Prof. Dr. med. Dr. med. habil. Système de respiration sous anesthésie à xénon

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4562000A (en) * 1982-04-21 1985-12-31 Kernforschungsanlage Julich Gesellschaft Mit Beschrankter Haftung Process for the separation of krypton from a radioactive waste gas mixture and arrangement for implementing the process
US4989597A (en) * 1987-03-09 1991-02-05 Olof Werner Apparatus for administration of at least two gases to a patient
DE19641643A1 (de) * 1996-10-09 1998-04-16 Linde Ag Verfahren zur Abtrennung von Xenon aus einem Gasgemisch
RU2183476C2 (ru) * 1999-07-26 2002-06-20 Государственное унитарное предприятие "Техноцентр "Лазерная диагностика и чистые технологии" Способ ингаляционной анестезии и оборудование для его осуществления
WO2003092778A1 (fr) * 2002-05-02 2003-11-13 Sysadvance - Sistemas De Engenharia Lda Unite de recyclage externe de xenon pour la recuperation, la purification et la reutilisation de xenon dans des circuits d'anesthesie

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4562000A (en) * 1982-04-21 1985-12-31 Kernforschungsanlage Julich Gesellschaft Mit Beschrankter Haftung Process for the separation of krypton from a radioactive waste gas mixture and arrangement for implementing the process
US4989597A (en) * 1987-03-09 1991-02-05 Olof Werner Apparatus for administration of at least two gases to a patient
DE19641643A1 (de) * 1996-10-09 1998-04-16 Linde Ag Verfahren zur Abtrennung von Xenon aus einem Gasgemisch
RU2183476C2 (ru) * 1999-07-26 2002-06-20 Государственное унитарное предприятие "Техноцентр "Лазерная диагностика и чистые технологии" Способ ингаляционной анестезии и оборудование для его осуществления
WO2003092778A1 (fr) * 2002-05-02 2003-11-13 Sysadvance - Sistemas De Engenharia Lda Unite de recyclage externe de xenon pour la recuperation, la purification et la reutilisation de xenon dans des circuits d'anesthesie

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 200262, Derwent World Patents Index; AN 581457, XP002397547 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2033680A1 (fr) * 2007-09-10 2009-03-11 Hargasser, Stefan, Prof. Dr. med. Dr. med. habil. Système de respiration sous anesthésie à xénon
WO2009033646A1 (fr) * 2007-09-10 2009-03-19 Stefan Hargasser Système de respiration sous anesthésie

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