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WO1991004067A1 - Methode et appareil pour le controle de gaz - Google Patents

Methode et appareil pour le controle de gaz Download PDF

Info

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
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.)
Ceased
Application number
PCT/GB1990/001465
Other languages
English (en)
Inventor
William Odita Tarnow-Mordi
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.)
University of Dundee
Original Assignee
University of Dundee
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
Priority claimed from GB898921544A external-priority patent/GB8921544D0/en
Priority claimed from GB898921800A external-priority patent/GB8921800D0/en
Application filed by University of Dundee filed Critical University of Dundee
Publication of WO1991004067A1 publication Critical patent/WO1991004067A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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.
PCT/GB1990/001465 1989-09-23 1990-09-21 Methode et appareil pour le controle de gaz Ceased WO1991004067A1 (fr)

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
GB8921800.2 1989-09-27
GB898921800A GB8921800D0 (en) 1989-09-27 1989-09-27 Monitoring apparatus

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 Ceased 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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000045163A3 (fr) * 1999-01-28 2000-12-14 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
WO2004097399A3 (fr) * 2003-04-23 2005-03-24 Renault Sa Dispositif et procede de mesure d’une concentration de polluant dans des effluents gazeux

Citations (3)

* Cited by examiner, † Cited by third party
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
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 (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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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