EP1817069A1 - Method for providing gas mixtures for respirators and method for carrying out said method - Google Patents
Method for providing gas mixtures for respirators and method for carrying out said methodInfo
- 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- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000000203 mixture Substances 0.000 title claims abstract description 13
- 239000007789 gas Substances 0.000 claims abstract description 54
- 230000006978 adaptation Effects 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 description 21
- 229910052760 oxygen Inorganic materials 0.000 description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 19
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 230000003434 inspiratory effect Effects 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT20192004 | 2004-12-01 | ||
PCT/AT2005/000479 WO2006058354A1 (en) | 2004-12-01 | 2005-11-30 | Method for providing gas mixtures for respirators and method for carrying out said method |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1817069A1 true EP1817069A1 (en) | 2007-08-15 |
Family
ID=35737233
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05812811A Withdrawn EP1817069A1 (en) | 2004-12-01 | 2005-11-30 | Method for providing gas mixtures for respirators and method for carrying out said method |
Country Status (4)
Country | Link |
---|---|
US (1) | US20080127975A1 (en) |
EP (1) | EP1817069A1 (en) |
CN (1) | CN101111277A (en) |
WO (1) | WO2006058354A1 (en) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE533365C2 (en) * | 2008-02-08 | 2010-09-07 | Igeloesa Life Science Ab | Cardiac rescue procedure and system |
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 |
US8424523B2 (en) * | 2009-12-03 | 2013-04-23 | Covidien Lp | Ventilator respiratory gas accumulator with purge valve |
CN102114295B (en) * | 2009-12-31 | 2013-10-23 | 北京谊安医疗系统股份有限公司 | Oxygen mixing method for electric respirator |
US8171094B2 (en) * | 2010-01-19 | 2012-05-01 | Event Medical, Inc. | System and method for communicating over a network with a medical device |
CN102266630B (en) * | 2010-12-31 | 2014-10-01 | 北京谊安医疗系统股份有限公司 | Breathing machine gas proportion control method and device |
EP2744555B1 (en) | 2011-09-22 | 2019-07-10 | Koninklijke Philips N.V. | Method and apparatus for monitoring and controlling a pressure support device |
KR101317927B1 (en) * | 2011-11-30 | 2013-10-16 | 주식회사 옥서스 | Device and method for supplying oxygen |
US10751500B2 (en) | 2011-11-30 | 2020-08-25 | Oxus Co., Ltd. | Apparatus and method for oxygen delivery |
ES2952557T3 (en) * | 2013-03-15 | 2023-11-02 | Mallinckrodt Hospital Products Ip Ltd | Therapeutic gas delivery device with continuous and pulsed flow control |
ES2860999A1 (en) * | 2020-04-01 | 2021-10-05 | Gas N2Itrogen S L | MECHANICAL INTUBATION RESPIRATOR (Machine-translation by Google Translate, not legally binding) |
US11872349B2 (en) | 2020-04-10 | 2024-01-16 | Covidien Lp | Systems and methods for increasing ventilator oxygen concentration |
WO2021207600A1 (en) | 2020-04-10 | 2021-10-14 | Covidien Lp | Gas mixing system for medical ventilator |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3369558A (en) * | 1965-08-30 | 1968-02-20 | Air Reduction | Gas mixture proportioner |
US3515155A (en) | 1967-02-24 | 1970-06-02 | Air Reduction | Gas mixture proportioner |
US3809109A (en) * | 1969-06-25 | 1974-05-07 | Draegerwerk Ag | Method and apparatus for mixing gases under pressure particularly for respirators and medical devices |
US3626963A (en) | 1970-02-04 | 1971-12-14 | United Aircraft Corp | Fluid mixer utilizing fluidic timer actuating fluidic amplifier valves |
GB1364841A (en) * | 1971-08-12 | 1974-08-29 | British Oxygen Co Ltd | Fluid mixing |
US3762428A (en) * | 1971-11-15 | 1973-10-02 | Ocean Systems | Volumetric gas mixing system |
US3895642A (en) | 1972-12-20 | 1975-07-22 | Bird Corp | Method and apparatus for mixing gases |
US3841344A (en) * | 1973-06-06 | 1974-10-15 | Airco Inc | Gas mixing systems |
US3905394A (en) * | 1974-04-12 | 1975-09-16 | Digital Dynamics Inc | Flow control system |
US4323064A (en) * | 1976-10-26 | 1982-04-06 | Puritan-Bennett Corporation | Volume ventilator |
FR2472937A1 (en) | 1980-01-04 | 1981-07-10 | Synthelabo | ARTIFICIAL RESPIRATOR CONTROL DEVICE |
US4440176A (en) * | 1981-02-10 | 1984-04-03 | Memorial Hospital For Cancer And Allied Diseases | Digitally programmable cardiac synchronized high frequency jet ventilator control system |
SE430213B (en) * | 1981-03-10 | 1983-10-31 | Siemens Elema Ab | RESPIRATOR INTENDED TO BE CONNECTED TO THE HUMAN OR ANIMAL PATIENTS |
DE3611018C1 (en) * | 1986-03-27 | 1987-06-19 | Wiest Peter P | Insufflation device for gas |
GB2216816B (en) * | 1988-04-07 | 1991-07-03 | Lvovsky Politekhn I Im Leninsk | Apparatus for preparing gas mixtures from constituents taken in a given proportion |
DE69625244T2 (en) * | 1996-02-27 | 2003-08-14 | Koster Henk W | BREATHING SYSTEM WITH ADDITIONAL ADMINISTRATION OF GAS |
US5887611A (en) * | 1996-12-31 | 1999-03-30 | The University Of Florida | Gas blender |
WO2000059566A1 (en) * | 1999-04-07 | 2000-10-12 | Event Medical Limited | Breathing apparatus |
-
2005
- 2005-11-30 EP EP05812811A patent/EP1817069A1/en not_active Withdrawn
- 2005-11-30 CN CNA2005800476197A patent/CN101111277A/en active Pending
- 2005-11-30 WO PCT/AT2005/000479 patent/WO2006058354A1/en active Application Filing
- 2005-11-30 US US11/791,973 patent/US20080127975A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2006058354A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20080127975A1 (en) | 2008-06-05 |
WO2006058354A1 (en) | 2006-06-08 |
CN101111277A (en) | 2008-01-23 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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Effective date: 20071019 |
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RBV | Designated contracting states (corrected) |
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DAX | Request for extension of the european patent (deleted) | ||
RIC1 | Information provided on ipc code assigned before grant |
Ipc: G05D 7/06 20060101ALI20150903BHEP Ipc: A61M 16/10 20060101ALN20150903BHEP Ipc: A61M 16/12 20060101AFI20150903BHEP Ipc: A61M 16/20 20060101ALI20150903BHEP Ipc: G05D 11/13 20060101ALI20150903BHEP |
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INTG | Intention to grant announced |
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Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20160308 |