EP1817069A1 - Procede pour preparer des melanges gazeux pour des appareils respiratoires et dispositif pour realiser ce procede - Google Patents

Procede pour preparer des melanges gazeux pour des appareils respiratoires et dispositif pour realiser ce procede

Info

Publication number
EP1817069A1
EP1817069A1 EP05812811A EP05812811A EP1817069A1 EP 1817069 A1 EP1817069 A1 EP 1817069A1 EP 05812811 A EP05812811 A EP 05812811A EP 05812811 A EP05812811 A EP 05812811A EP 1817069 A1 EP1817069 A1 EP 1817069A1
Authority
EP
European Patent Office
Prior art keywords
valves
switching valves
opened
pressure
mixing chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05812811A
Other languages
German (de)
English (en)
Inventor
Dominik Lirsch
Robert KÖLBL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carl Reiner GmbH
Original Assignee
Carl Reiner GmbH
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 Carl Reiner GmbH filed Critical Carl Reiner GmbH
Publication of EP1817069A1 publication Critical patent/EP1817069A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/12—Preparation of respiratory gases or vapours by mixing different gases
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/20—Valves specially adapted to medical respiratory devices
    • A61M16/201—Controlled valves
    • A61M16/202—Controlled valves electrically actuated
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D11/00—Control of flow ratio
    • G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
    • G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
    • G05D11/131—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by measuring the values related to the quantity of the individual components
    • G05D11/133—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by measuring the values related to the quantity of the individual components with discontinuous action
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow
    • G05D7/06—Control of flow characterised by the use of electric means
    • G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
    • G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
    • G05D7/0635—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means
    • G05D7/0641—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means using a plurality of throttling means
    • G05D7/0652—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means using a plurality of throttling means the plurality of throttling means being arranged in parallel
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/1005—Preparation of respiratory gases or vapours with O2 features or with parameter measurement
    • A61M2016/102—Measuring a parameter of the content of the delivered gas
    • A61M2016/1025—Measuring a parameter of the content of the delivered gas the O2 concentration

Definitions

  • the invention relates to a method for providing gas mixtures for respirators in which a plurality of mutually different gases is supplied via switching valves to a mixing chamber, the switching valves are opened and closed in a timed manner, and the pressure in the mixing chamber is monitored and monitored a corresponding device for carrying out this method.
  • a method of the type mentioned above and a corresponding device can be found for example in US 4 576 159.
  • switching valves are used, which are operated in each case pulsed. Since a high degree of pressure fluctuations occurs due to the pulsating operation of the switching valves, it has been proposed here to supply the gas flows guided in each case via the valves to a wind chamber, in which the pressure has been uniformed and correspondingly monitored.
  • a wind chamber in which the pressure has been uniformed and correspondingly monitored.
  • an elastic membrane or a valve for maintaining constant pressure can be arranged, the air chamber was used as a mixing chamber and should primarily eliminate fluctuations of the gas pressures.
  • Other known devices in which the switching frequency has been influenced by switching valves can be found, for example, in US Pat. No. 3,626,963.
  • US Pat. No. 3,895,642 discloses the use of differential pressure valves to achieve the desired mixing ratio
  • US Pat. No. 4,380,233 discloses a ventilator with a special circuit arrangement for the operation of solenoid valves with which, apart from the switching frequency for the pulsed valves, also the Ratio of inspiratory and expiratory time could be preset.
  • the invention now aims to provide, independently of the preset mixing ratio and the respectively changing removal quantity, constant mixing and pressure " ⁇ J" ** ratios to ensure being able to perform a jet Beatm ⁇ ngs réelle a correspondingly high flow with correspondingly high pressure.
  • the inventive method consists essentially in that the gases different from each other are each guided over a plurality of parallel switching valves and ⁇ the control of the switching valves is such that a coarse mixing ratio of the gases corresponding number of each other different valves associated switching valves is opened and closed synchronously.
  • a plurality of valves is arranged in parallel for different gases, such as oxygen and air, it is possible by coarse and further to ensure the desired flow rate by choosing the appropriate number of each openable valves a desired mixing ratio.
  • These respective basic settings serving valves or valve groups can be operated synchronously, clocked accordingly, the respective gas streams are fed to the mixing chamber.
  • the mixing chamber thus receives directly the desired gas mass in the unit time and the respective gas streams in the desired mixing ratio.
  • the inventive method is advantageously developed so that at least another of the adaptation to a defined mixing ratio serving switching valve opened and closed asynchronously compared to other other switching valves is, with the sum of each opened further valves is kept constant.
  • This further valve or these other valves are now operated asynchronously, so that when, for example, a valve in the oxygen line is closed, a valve in the air line or a further gas line is opened.
  • the procedure is such that the total number of valves opened in each case is selected as a function of the desired flow rate and kept constant.
  • the clocked respectively pulsed operated switching valves can be operated pulsed according to the requirements of the pressure control, the pressure itself can be subjected to a two-point control in a conventional manner and the corresponding control signals can be made directly the switching valves available.
  • a throttle gas can be diverted and fed to a gas analysis, whereby the mixing ratio is continuously checked and quality control is enabled.
  • the inventive device for carrying out this method is essentially characterized in that between each port for a gas line and a mixing chamber, a plurality of clocked open and closable switching valves is turned on and that the switching valves are connected to a controller and a clock whose clock frequency or Control signals for opening and closing the switching valves depending on specifications for the mixing ratio of the gases and the desired flow rate for individual valves in the same gas path are separately adjustable.
  • the design is advantageously such that in each gas path at least three, preferably four, valves are arranged parallel to each other, wherein preferably the mixing chamber is designed as a pressure vessel whose pressure is monitored by at least one sensor whose sensor signals is supplied to the control unit to a pressure control.
  • the mixing chamber is designed as a pressure vessel whose pressure is monitored by at least one sensor whose sensor signals is supplied to the control unit to a pressure control.
  • a quality control training is advantageously made such that in at least one gas path, a throttle is guided to a branch line, to which a Gasanaly ⁇ e réelle can be connected.
  • the inventive design results in a device in which the corresponding pressure, flow rate and mixing constancy can be preset in one operation, so that a much smaller mixing chamber can be used to equalize the pressure peaks used.
  • the mixing ratio can be set with a higher accuracy with a deviation of less than 1% of the nominal value, whereby with short-term maximum sampling a corresponding buffering in the mixing chamber can be ensured.
  • FIG. 2 shows a diagram of the switching times of the valves for setting the desired mixing ratio
  • FIG. 3 shows a modified and supplemented illustration corresponding to FIG. 2, in which the pressure profile and so that the pressure control over a plurality of switching cycles is shown.
  • Fig.l 1 with the compressed air coupling and with 2 the oxygen coupling of the corresponding gas supply of a hospital is indicated schematically.
  • the respective clutches each pressure regulator 3 are connected downstream, the corresponding pressure sensors are denoted by 4.
  • a plurality of valves are arranged in parallel, wherein in the illustration of Fig.l four valves are provided, which are referred to in the case of the airway as VLl to VL4 and in the case of the oxygen path as VOl to VO4 are drawn. All these valves are open as clocked open and closable valves are formed and are opened and closed by a pulse generator not shown in each case.
  • the respective sum output of the gas lines 5 and 6 is combined via a line 7 and fed to a mixing chamber 8.
  • the mixing chamber 8 can build relatively small, wherein the respectively supplied with high pressure and in an appropriate amount of gases for better turbulence and separated from each other and can be introduced tangentially into the mixing chamber.
  • the mixing chamber itself has a pressure sensor 9, via which the respective upper or lower pressure value for the two-point control is set.
  • Denoted at 10 is a throttle via which gas is supplied to an oxygen sensor 11 for analysis of the gas.
  • the mixture is supplied via line 12 to the ventilator.
  • valves VO2 and VL3 are provided, which are now alternately operated, that is operated asynchronously, so that in total from Tl to TO that flow rate is performed, which would correspond to another valve, since the two valves VO2 and VL3 are switched at time tl, so that in each case only one valve is open.
  • the period of valve change results in a corresponding fine adjustment of the mixing ratio, and in particular the desired oxygen concentration in the air-oxygen mixture.
  • the corresponding pressure curve can be seen in addition via the respective switching times of the different valves VO1, VO2 and VL1, VL2 and VL3.
  • the pressure is at the lower limit value pl and rises in the course of the switch-on cycle, in which the respective valve change times tl and t2 are for the switching of valves, up to a pressure p2, followed by a switch-off at this time TO until the pressure has again dropped from p2 to pl.
  • pressure values between p1 and p2 are again obtained correspondingly shifted from T1 to TO, wherein now three switching change times t1, t2 and t3 are observed in order to ensure the desired constancy and the desired mixing ratio for the same mass in the unit of time.
  • the switching valves VOl to V04 or VLl to VL4 each fill the mixing chamber with the desired mixture, and as soon as the upper pressure limit is reached in the mixing chamber, all valves are closed. As soon as the pressure drops to the lower pressure limit, the respectively corresponding valves are opened again, whereby a two-point control is realized.
  • the number of the used switching valves for air and oxygen are a coarse mixing ratio before, preferablyi- additionally by 'the momentary switch back and forth at least one of air and an oxygen valve, the mixture may be refined, in the "mixing chamber, the resulting oxygen concentration with high accuracy of less than +/- 1% by weight.
  • the central gas supply of a hospital usually supplies air and oxygen with pressures between 4 and 10 bar, whereby the respective operating pressures are usually set to 4.5 to 5 bar via an inlet pressure regulator. Even if, for example, can not be ensured that a central gas supply to a hospital With pressures reaching from 4.5 to 5 bar or more, certain operating modes can still be achieved with restrictions, such as reduced flow or radiation pressure, for which the operating pressures according to the inlet pressure regulators for air and oxygen are exactly the same for an optimal air-oxygen mixture should.
  • the oxygen concentration is measured via an oxygen sensor, which is connected to the mixing chamber via a controllable throttle pressure regulator.
  • the control detects signals of all cited sensors and in particular the signals of the sensors 4 of the input controller 3 in order to take into account different operating pressures in the gas supply can.
  • pressure differences of up to 1 bar can be compensated by appropriately influencing the clock frequencies or opening times of the respective valves VL1 to VL4 or VO1 to V04.

Abstract

L'invention concerne un procédé pour préparer des mélanges gazeux pour des appareils respiratoires, selon lequel une pluralité de gaz différents sont introduits par des soupapes de commande (VL, VO) d'une chambre de mélange (8), les soupapes de commande (VL, VO) étant ouvertes et fermées de manière cadencée et la pression de la chambre de mélange (8) étant surveillée. Les différents gaz sont conduits par une pluralité de soupapes de commande (VL, VO) parallèles, qui sont commandées de sorte qu'un nombre correspondant à un mélange gazeux approximatif de soupapes de commande (VL, VO) associées chacune à des gaz différents est ouvert et fermé de manière synchrone.
EP05812811A 2004-12-01 2005-11-30 Procede pour preparer des melanges gazeux pour des appareils respiratoires et dispositif pour realiser ce procede Withdrawn EP1817069A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT20192004 2004-12-01
PCT/AT2005/000479 WO2006058354A1 (fr) 2004-12-01 2005-11-30 Procede pour preparer des melanges gazeux pour des appareils respiratoires et dispositif pour realiser ce procede

Publications (1)

Publication Number Publication Date
EP1817069A1 true EP1817069A1 (fr) 2007-08-15

Family

ID=35737233

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05812811A Withdrawn EP1817069A1 (fr) 2004-12-01 2005-11-30 Procede pour preparer des melanges gazeux pour des appareils respiratoires et dispositif pour realiser ce procede

Country Status (4)

Country Link
US (1) US20080127975A1 (fr)
EP (1) EP1817069A1 (fr)
CN (1) CN101111277A (fr)
WO (1) WO2006058354A1 (fr)

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SE533365C2 (sv) * 2008-02-08 2010-09-07 Igeloesa Life Science Ab Förfarande och system för hjärtlungräddning
US20090205661A1 (en) * 2008-02-20 2009-08-20 Nellcor Puritan Bennett Llc Systems and methods for extended volume range ventilation
US8393323B2 (en) 2008-09-30 2013-03-12 Covidien Lp Supplemental gas safety system for a breathing assistance system
US8082312B2 (en) * 2008-12-12 2011-12-20 Event Medical, Inc. System and method for communicating over a network with a medical device
GB0920165D0 (en) * 2009-11-18 2009-12-30 Fairlight Developments Ltd Gas mixing apparatus
US8434484B2 (en) 2009-12-03 2013-05-07 Covidien Lp Ventilator Respiratory Variable-Sized Gas Accumulator
CN102114295B (zh) * 2009-12-31 2013-10-23 北京谊安医疗系统股份有限公司 用于电动呼吸机的混氧方法
US8171094B2 (en) * 2010-01-19 2012-05-01 Event Medical, Inc. System and method for communicating over a network with a medical device
CN102266630B (zh) * 2010-12-31 2014-10-01 北京谊安医疗系统股份有限公司 一种呼吸机气体比例控制方法及装置
JP6034383B2 (ja) * 2011-09-22 2016-11-30 コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． 圧力サポート装置を監視するための及び制御するための方法並びに装置
US10751500B2 (en) 2011-11-30 2020-08-25 Oxus Co., Ltd. Apparatus and method for oxygen delivery
KR101317927B1 (ko) * 2011-11-30 2013-10-16 주식회사 옥서스 산소 공급 장치 및 방법
EP3756714B1 (fr) * 2013-03-15 2023-05-17 Mallinckrodt Hospital Products IP Limited Dispositif d'administration de gaz thérapeutique à commande d'écoulement pulsée ou continue
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US11872349B2 (en) 2020-04-10 2024-01-16 Covidien Lp Systems and methods for increasing ventilator oxygen concentration
US11883604B2 (en) 2020-04-10 2024-01-30 Covidien Lp Gas mixing system for medical ventilator

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Also Published As

Publication number Publication date
CN101111277A (zh) 2008-01-23
WO2006058354A1 (fr) 2006-06-08
US20080127975A1 (en) 2008-06-05

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