WO1991004067A1 - Methode et appareil pour le controle de gaz - Google Patents
Methode et appareil pour le controle de gaz Download PDFInfo
- Publication number
- WO1991004067A1 WO1991004067A1 PCT/GB1990/001465 GB9001465W WO9104067A1 WO 1991004067 A1 WO1991004067 A1 WO 1991004067A1 GB 9001465 W GB9001465 W GB 9001465W WO 9104067 A1 WO9104067 A1 WO 9104067A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gas
- conduit
- sensor
- sensing chamber
- sensing
- Prior art date
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims description 8
- 238000004891 communication Methods 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 63
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 230000000241 respiratory effect Effects 0.000 claims description 3
- 239000000523 sample Substances 0.000 description 9
- 238000005259 measurement Methods 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 2
- 206010016803 Fluid overload Diseases 0.000 description 1
- 206010036590 Premature baby Diseases 0.000 description 1
- 206010037660 Pyrexia Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000001886 ciliary effect Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000003097 mucus Anatomy 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000028327 secretion Effects 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0011—Sample conditioning
- G01N33/0016—Sample conditioning by regulating a physical variable, e.g. pressure or temperature
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0011—Sample conditioning
Definitions
- This invention relates to a monitoring apparatus, and in particular to a monitoring apparatus for artificial ventilation.
- Apparatus has been proposed for monitoring the relative humidity of the gas entering the infant, but its measurements depend on tapping a small amount (3-4%) of gas from the gas supply and feeding this through an electronic hygrometer and its associated thermistor. Consequently the sample size is small and the readings may be inaccurate.
- apparatus for monitoring gas from a ventilator comprising a gas supply conduit and a sensor for sensing one or more parameters of the gas, the sensor being in communication with the conduit so that in use a portion of the gas flowing in the conduit is diverted from the conduit to the sensor and thence re-joins the conduit.
- a method of monitoring gas from a ventilator comprising diverting a portion of the gas flowing from the ventilator, sensing one or more parameters of the portion and allowing the portion of gas to re-join the flowing gas.
- the gas supply conduit may be a line which supplies a mixture of air and oxygen to a patient receiving respiratory support from the ventilator.
- the sensor may be disposed in a sensing chamber.
- the conduit may be adjacent the sensing chamber and in communication with the chamber through a branch of the conduit.
- the conduit and the sensing chamber share a mutual wall which is cut away to provide a 'window' through which the gas from the conduit has access into and out of the sensing chamber.
- the flow rate of the gas ensures that this occurs in a turbulent fashion to ensure a good mix and give accurate sampling.
- a baffle or other obstruction may be provided in the conduit to cause positive diversion of a portion of the gas to the sensor.
- the senor comprises a probe.
- the probe may be attached to apparatus which measures physical parameters such as relative humidity and temperature.
- apparatus may be an electronic hygrometer and a thermistor.
- the gas at the sensor is at a temperature that exceeds its dewpoint. This avoids condensation which may lead to inaccurate measurement. Most preferably the temperature is from 37 to 40 degrees C.
- a heating coil may be provided to ensure the temperature of the gas is higher than its dewpoint.
- the heating coil is preferably wrapped around the sensing chamber, and may also be wrapped around the ' conduit in the vicinity of the sensing chamber.
- Fig. la is a side view of a first embodiment of monitoring apparatus of the present invention
- Fig. lb is a cross-sectional view along A-A of Fig. la
- Fig. 2a is a side view of a second embodiment of monitoring apparatus of the present invention
- Fig. 2b is a cross-sectional view along B-B of 1 Fig. 2a;
- FIG. 3 is an end view of the monitoring apparatus
- Figs. 5a, 5b and 5c are an end view, a
- FIG. 10 Figs. 6a and 6b is a sectional side view and an
- Figs, la and lb show a first embodiment of a monitoring
- the 6 apparatus comprises a gas supply conduit in the form of
- the heating coil 7 is electrically
- apparatus 101 a gas line 102 and a sensing chamber 103
- the chamber 103 are both wrapped in an insulated coil 107 and a socket 109 (see also Fig 3)is provided to heat both the gas line 102 and the chamber 103 to the same temperature.
- the gas line 102 is shown in more detail in Figs 5a to 5c and is a tube which has an internal diameter which is narrower than the internal diameter of the chamber 103.
- a baffle 15 is located in the line 102 and diverts air from the line 102 into the sensing chamber 103 through the window 11.
- the chamber 103 is blocked at one end 106 and its other end 105 is used to admit a probe (not shown).
- Figs. 4a to 4c show the sensing chamber 103 in more detail and Fig. 4b shows that the sensing chamber 103 is internally threaded at 12 and the probe has a corresponding thread to enable the probe to be screwed into the sensing chamber 103.
- the probe is connected to an electronic hygrometer and its associated thermistor (not shown).
- the thermistor and the humidity sensor are combined and may be, for example, a VAISALA (Trade Mark) humidity and temperature probe.
- VAISALA Trade Mark
- Fig. 3 an insulating jacket 13 is wrapped around the socket 109 and Figs. 6 and 6a show how the socket 109 is fitted into its jacket 13.
- both embodiments provide a closed loop between the gas line 102 and the sensing chamber 103, loss of pressure in the gas line, which may adversely affect the baby, is prevented.
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
On décrit un appareil pour contrôler du gaz provenant d'un ventilateur, ledit appareil comprenant un détecteur disposé dans une chambre de détection (103) en communication gazeuse avec un conduit d'alimentation en gaz (102), qui amène du gaz dudit ventilateur à un patient. La communication gazeuse (11) disposée entre la chambre (103) et le conduit (102) permet au gaz provenant du conduit (102) d'entrer d'abord dans ladite chambre de détection (103), et ensuite dans ledit conduit (102). En général, on prévoit une chicane (15) pour dévier dans la chambre (103) une partie du gaz provenant du conduit (102). On peut également prévoir une bobine de chauffage (107) de manière à assurer une température du gaz à proximité du détecteur supérieure au point de rosée dudit gaz.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB898921544A GB8921544D0 (en) | 1989-09-23 | 1989-09-23 | Monitoring apparatus |
GB8921544.6 | 1989-09-23 | ||
GB898921800A GB8921800D0 (en) | 1989-09-27 | 1989-09-27 | Monitoring apparatus |
GB8921800.2 | 1989-09-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991004067A1 true WO1991004067A1 (fr) | 1991-04-04 |
Family
ID=26295964
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1990/001465 WO1991004067A1 (fr) | 1989-09-23 | 1990-09-21 | Methode et appareil pour le controle de gaz |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU6409490A (fr) |
WO (1) | WO1991004067A1 (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000045163A2 (fr) * | 1999-01-28 | 2000-08-03 | Honeywell Inc. | Boitier de microcapteur |
WO2002085438A1 (fr) * | 2001-04-24 | 2002-10-31 | Nordisk Industrifysik Ab | Procede et dispositif de mesure de l'humidite transportee en provenance et a destination d'un ventilateur |
FR2854242A1 (fr) * | 2003-04-23 | 2004-10-29 | Renault Sa | Dispositif et procede de mesure d'une concentration de polluant dans des effluents gazeux |
WO2004097399A2 (fr) * | 2003-04-23 | 2004-11-11 | Renault S.A.S. | Dispositif et procede de mesure d’une concentration de polluant dans des effluents gazeux |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0029352A1 (fr) * | 1979-11-20 | 1981-05-27 | Michigan Instruments. Inc. | Réanimateur cardio-pulmonaire |
US4367734A (en) * | 1980-08-28 | 1983-01-11 | Dragerwerk Aktiengesellschaft | Y-Fitting in the patient system of respirators |
US4838257A (en) * | 1987-07-17 | 1989-06-13 | Hatch Guy M | Ventilator |
-
1990
- 1990-09-21 AU AU64094/90A patent/AU6409490A/en not_active Abandoned
- 1990-09-21 WO PCT/GB1990/001465 patent/WO1991004067A1/fr unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0029352A1 (fr) * | 1979-11-20 | 1981-05-27 | Michigan Instruments. Inc. | Réanimateur cardio-pulmonaire |
US4367734A (en) * | 1980-08-28 | 1983-01-11 | Dragerwerk Aktiengesellschaft | Y-Fitting in the patient system of respirators |
US4838257A (en) * | 1987-07-17 | 1989-06-13 | Hatch Guy M | Ventilator |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000045163A2 (fr) * | 1999-01-28 | 2000-08-03 | Honeywell Inc. | Boitier de microcapteur |
WO2000045163A3 (fr) * | 1999-01-28 | 2000-12-14 | Honeywell Inc | Boitier de microcapteur |
US6361206B1 (en) | 1999-01-28 | 2002-03-26 | Honeywell International Inc. | Microsensor housing |
WO2002085438A1 (fr) * | 2001-04-24 | 2002-10-31 | Nordisk Industrifysik Ab | Procede et dispositif de mesure de l'humidite transportee en provenance et a destination d'un ventilateur |
FR2854242A1 (fr) * | 2003-04-23 | 2004-10-29 | Renault Sa | Dispositif et procede de mesure d'une concentration de polluant dans des effluents gazeux |
WO2004097399A2 (fr) * | 2003-04-23 | 2004-11-11 | Renault S.A.S. | Dispositif et procede de mesure d’une concentration de polluant dans des effluents gazeux |
WO2004097399A3 (fr) * | 2003-04-23 | 2005-03-24 | Renault Sa | Dispositif et procede de mesure d’une concentration de polluant dans des effluents gazeux |
Also Published As
Publication number | Publication date |
---|---|
AU6409490A (en) | 1991-04-18 |
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