GB2297914A - Humidifier system with humidity sensor - Google Patents

Humidifier system with humidity sensor Download PDF

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Publication number
GB2297914A
GB2297914A GB9600483A GB9600483A GB2297914A GB 2297914 A GB2297914 A GB 2297914A GB 9600483 A GB9600483 A GB 9600483A GB 9600483 A GB9600483 A GB 9600483A GB 2297914 A GB2297914 A GB 2297914A
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GB
United Kingdom
Prior art keywords
humidifier
humidity sensor
humidifier system
tube
connector
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.)
Granted
Application number
GB9600483A
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GB9600483D0 (en
GB2297914B (en
Inventor
Christopher Stratton Turnbull
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.)
Smiths Group PLC
Original Assignee
Smiths 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 Smiths Group PLC filed Critical Smiths Group PLC
Publication of GB9600483D0 publication Critical patent/GB9600483D0/en
Publication of GB2297914A publication Critical patent/GB2297914A/en
Application granted granted Critical
Publication of GB2297914B publication Critical patent/GB2297914B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/14—Preparation of respiratory gases or vapours by mixing different fluids, one of them being in a liquid phase
    • A61M16/16—Devices to humidify the respiration air
    • A61M16/162—Water-reservoir filling system, e.g. automatic
    • 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
    • A61M16/1075—Preparation of respiratory gases or vapours by influencing the temperature
    • A61M16/109—Preparation of respiratory gases or vapours by influencing the temperature the humidifying liquid or the beneficial agent
    • 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
    • A61M16/14—Preparation of respiratory gases or vapours by mixing different fluids, one of them being in a liquid phase
    • A61M16/16—Devices to humidify the respiration air
    • 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
    • A61M16/14—Preparation of respiratory gases or vapours by mixing different fluids, one of them being in a liquid phase
    • A61M16/16—Devices to humidify the respiration air
    • A61M16/161—Devices to humidify the respiration air with means for measuring the humidity
    • 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
    • A61M16/1045—Devices for humidifying or heating the inspired gas by using recovered moisture or heat from the expired gas
    • 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
    • A61M16/1075—Preparation of respiratory gases or vapours by influencing the temperature

Description

HUMIDIFIER SYSTEMS This invention relates to humidifier systems.
2297914 Humidifier systems comprising a humidifier and a tracheal tube or mask are used to increase the humidity of gas supplied to a patient.
Examples of such systems are described in WO 91/19527 and 9522267. The humidifier usually incorporates a heater arranged to vaporize liquid water. The heater may be selfregulating or a separate temperature sensor may be provided to indicate the temperature of gas supplied to the patient. The humidity can be varied by altering the rate of water flow to the humidifier and this can be controlled in response to sensed temperature. This does not, however, provide a very accurate control of humidity.
It is an object of the present invention to provide a system that can be used to provide improved humidity control.
According to the present invention there is provided a humidifier system comprising a humidifier, gas supply means connected to the humidifier to supply humidified gas to the patient, and humidity sensor means connected in the gas supply means to provide an output representative of the humidity of gas supplied to the patient.
The gas supply means may include a tube and a connector connected with the tube, the humidity sensor being mounted in the connector. The tube may be a tracheal tube, the gas supply means including tubing connected between the machine end of the tracheal tube and the humidifier, and the connector being connected between the tracheal tube and the tubing. The output of the humidity sensor is preferably connected to the humidifier to control humidification of the gas. The humidifier may include a heat and moisture exchange device, a supply of water to the exchange device and a heater for heating the water supplied to the exchange device. The humidifier may include a water pump, the output of the humidity sensor being connected to control the speed of the pump. The output of the humidity sensor may be connected to control the temperature of the heater.
A humidifier system according to the present invention will now be described, by way of example, with reference to the accompanying drawing, which shows the system schematically.
The system comprises a tracheal tube 1, or other breathing device, connected to humidifier apparatus 2 controlled by a hun-fidity sensor 3. The system is connected to ventilator apparatus 4.
The tracheal tube 1 is of conventional construction, having an cuff 10 around its patient end, which seals with the trachea when inflated. At its machine or proximal end, the tube 1 is connected to a connector 15. The connector 15 includes a humidity sensor 3 exposed to gas flowing along the interior of the connector and hence along the tube. A wire 11 extends from the sensor 3 and is connected via a coupling 13 to a cable 14 extending to a control unit 20 of the humidifier apparatus 2. The sensor 3 could be mounted at various other locations such as, in the tube 1 itself, for example at its patient end, or in flexible tubing 16 connected to the connector 15.
The flexible tubing 16 extends to a heat and moisture exchange (HME) device 22 forming a part of the humidifier apparatus 2. The device 22 has an outer housing 23 and an exchange element 24 made of paper or foam plastics treated to be hygroscopic. On the patient side of the exchange element 24, within the housing 23, there is an electrical heater 25 covered by an absorbent wick 26. A water inlet 27 is located close to the wick 26 and is connected via tubing 28 to a water reservoir in the form of a suspended bag 29 of sterile water. The tubing 28 passes through a peristaltic pump 30 contained within the same housing 31 as the control unit 20. The control unit 20 controls the speed of the pump 30 and also provides power output -3 to the heater 25 via a lead 32. Various displays may be provided on the housing 3 1, such as a display 33 of humidity, as sensed by the sensor 3.
In operation, the ventilator 4 supplies gas to the patient via the HMEE device 22 and gas supply means comprising the tubing 16, connector 15 and the tracheal tube 1. Exhaled gas flows from the patient towards the ventilator 4 through the exchange element 24 to which it gives up a large part of its heat and moisture. Inhaled gas flows in the opposite direction through the exchange element 24 and, because it is relatively cool and dry, it takes up heat and moisture from the exchange element. The heat and moisture of the inhaled gas, after passing through the exchange element 24 is supplemented by heat from the heater 25 and moisture evaporated from the wick 26.
The level of humidity of gas supplied to the patient may vary for several reasons, such as, increased respiration rate, change in ambient temperature, or change in perfon-nance of the exchange element 24 with time. Any such change in humidity is sensed by the sensor 3 and signalled to the control unit 20. A fall in humidity causes the control unit 20 to increase the speed of the peristaltic pump 30 so as to increase the flow of water to the HME device 22; it may also increase the temperature of the heater 25 to increase the rate of evaporation from the wick 26.
Various modifications are possible. For example, the humidity sensor could be mounted in the BIVIE device 22 or on a separate probe that can be inserted in the tracheal tube 1, as desired, through, for example, a suctioning port in an angled coupling.
4 CLAMS A humidifier system comprising a humidifier, gas supply means connected to the humidifier to supply humidified gas to the patient, and humidity sensor means connected in said gas supply means to provide an output representative of the humidity of gas supplied to the patient.
2.

Claims (1)

  1. A humidifier system according to Claim 1, wherein the gas supply means
    includes a tube and a connector connected with the tube, and wherein the humidity sensor means is mounted in said connector.
    3. A humidifier system according to Claim 2, wherein the tube is a tracheal tube, and wherein the gas supply means includes tubing connected between the machine end of the tracheal tube and the humidifier, and wherein the connector is connected between the tracheal tube and the tubing.
    A humidifier system according to any one of the preceding claims, wherein the output of the humidity sensor means is connected to the hun-ddifier to control humidification of the gas.
    5. A humidifier system according to any one of the preceding claims, wherein the hun-fidifier includes a heat and moisture exchange device, a supply of water to the exchange device and a heater for heating the water supplied to the exchange device.
    6. A humidifier system according to Claim 5, wherein the hurridifier includes a water pump, and wherein the output of the humidity sensor means is connected to control the speed of the pump.
    A humidifier system according to Claim 5 or 6, wherein the output of the humidity sensor means is connected to control the temperature of the heater.
    8. A humidifier system substantially as hereinbefore described with reference to the accompanying drawing.
    9. Any novel feature or combination of features as hereinbefore described.
GB9600483A 1995-02-16 1996-01-10 Humidifier systems Expired - Fee Related GB2297914B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB9503012.8A GB9503012D0 (en) 1995-02-16 1995-02-16 Humidifier systems

Publications (3)

Publication Number Publication Date
GB9600483D0 GB9600483D0 (en) 1996-03-13
GB2297914A true GB2297914A (en) 1996-08-21
GB2297914B GB2297914B (en) 1999-02-10

Family

ID=10769690

Family Applications (2)

Application Number Title Priority Date Filing Date
GBGB9503012.8A Pending GB9503012D0 (en) 1995-02-16 1995-02-16 Humidifier systems
GB9600483A Expired - Fee Related GB2297914B (en) 1995-02-16 1996-01-10 Humidifier systems

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GBGB9503012.8A Pending GB9503012D0 (en) 1995-02-16 1995-02-16 Humidifier systems

Country Status (6)

Country Link
US (1) US5769071A (en)
JP (1) JPH08257126A (en)
AU (1) AU702011B2 (en)
DE (1) DE19602077A1 (en)
FR (1) FR2730640B1 (en)
GB (2) GB9503012D0 (en)

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US7962018B2 (en) 1997-06-17 2011-06-14 Fisher & Paykel Healthcare Limited Humidity controller
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US10130787B2 (en) 1997-06-17 2018-11-20 Fisher & Paykel Healthcare Limited Humidity controller
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US7962018B2 (en) 1997-06-17 2011-06-14 Fisher & Paykel Healthcare Limited Humidity controller
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AU4201296A (en) 1996-08-22
GB9600483D0 (en) 1996-03-13
GB9503012D0 (en) 1995-04-05
DE19602077A1 (en) 1996-08-22
FR2730640A1 (en) 1996-08-23
JPH08257126A (en) 1996-10-08
US5769071A (en) 1998-06-23
FR2730640B1 (en) 1999-06-11
AU702011B2 (en) 1999-02-11
GB2297914B (en) 1999-02-10

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