WO2005021076A2 - Element chauffant pour conduit de ventilateur - Google Patents

Element chauffant pour conduit de ventilateur Download PDF

Info

Publication number
WO2005021076A2
WO2005021076A2 PCT/GB2004/003688 GB2004003688W WO2005021076A2 WO 2005021076 A2 WO2005021076 A2 WO 2005021076A2 GB 2004003688 W GB2004003688 W GB 2004003688W WO 2005021076 A2 WO2005021076 A2 WO 2005021076A2
Authority
WO
WIPO (PCT)
Prior art keywords
heating wire
assembly
wire
sensors
tube
Prior art date
Application number
PCT/GB2004/003688
Other languages
English (en)
Other versions
WO2005021076A3 (fr
Inventor
Stuart Corner
Paul Berwick
Original Assignee
E.M.E. (Electro Medical Equipment) Limited
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 E.M.E. (Electro Medical Equipment) Limited filed Critical E.M.E. (Electro Medical Equipment) Limited
Publication of WO2005021076A2 publication Critical patent/WO2005021076A2/fr
Publication of WO2005021076A3 publication Critical patent/WO2005021076A3/fr

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
    • A61M16/1075—Preparation of respiratory gases or vapours by influencing the temperature
    • 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
    • A61M16/1095—Preparation of respiratory gases or vapours by influencing the temperature in the connecting tubes
    • 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
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/33—Controlling, regulating or measuring
    • A61M2205/3368—Temperature
    • 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
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/36—General characteristics of the apparatus related to heating or cooling
    • A61M2205/3653—General characteristics of the apparatus related to heating or cooling by Joule effect, i.e. electric resistance

Definitions

  • Heater for Ventilator Conduit This invention relates to heaters for conduits which supply humidified air from a ventilator to a patient for reducing condensation in the conduit .
  • a plastics conduit i.e. a breathing tube
  • This phenomenon is also known as "rainout". Rainout is undesirable since the water collects in the tube which can cause blockages or provide a breeding ground for bacteria. Such water must therefore be periodically drained.
  • GB-A-2284356 An example of such a proposal is shown in GB-A-2284356.
  • one such system which is currently available commercially has a specially modified breathing tube with apertures moulded into it at certain points into which encased thermistors are inserted.
  • the thermistors monitor the temperature of the gas in the tube and may therefore be used to regulate the power supply to the heating wire if the temperature of the supplied gas rises too high.
  • the Applicant has realised that there are a number of problems associated with it. Firstly, the encased thermistor assembly is relatively expensive such that it must be reused from one patient to the next.
  • the breathing tube itself and the heating wire are disposable.
  • a further problem with the system described above is that the encased thermistors must be inserted into the apertures in the breathing tube each time the equipment is set up. In order to achieve a good seal, the thermistors are designed to be a tight fit in the apertures, but this can make them difficult to insert properly. It is therefore not uncommon for the thermistors not to be pushed fully home. This makes them inaccurate as they are not then in the degree of thermal contact with the gas flow that they were designed for.
  • the present invention provides a heating wire assembly for reducing condensation in a breathing tube delivering humidified gas to a patient for breathing, said assembly comprising: an electrically resistive heating wire; a plurality of thermally responsive sensors at discrete locations along the heating wire assembly; and at least one signal wire connected to each of said sensors, wherein said heating wire and said signal wires are terminated for connection thereto at a common end of the assembly and are bound together to facilitate insertion of the assembly into a breathing tube.
  • a self- contained heating wire assembly with thermal sensors is provided that may be simply inserted into one end of a breathing to tube to extend along at least part of the length of the tube .
  • the wire assembly in accordance with the invention may be manufactured sufficiently inexpensively that it may be disposable.
  • the wire assembly may therefore be inserted into the tube at the time of manufacture and the entire system - i.e. the breathing tube and the heating wire and sensors may be disposed of together after a single use. Not only does this facilitate setting up the ventilator apparatus, it avoids the potential hygiene problems outlined above with respect to the prior art.
  • Any thermally responsive sensor giving an electrical signal may be used, but preferably the sensors comprise thermistors since these are relatively inexpensive and give an easily measured electrical response by their change in resistance.
  • sensors are provided at two locations along the wire assembly, most preferably approximately at the proximal and distal ends thereof respectively.
  • the thermal sensors will be in relatively close proximity to the heating wire. They will therefore at least partially measure the temperature of the heating wire as well as the gas passing over them. This provides an additional safety benefit in that if for any reason the wire should begin to increase in temperature, this will be sensed immediately by the sensors and the power thereto may be reduced.
  • a single sensor may be provided at each location.
  • a pair of sensors is provided at the proximal end, with one being in closer thermal contact with the heating wire than the other. This allows the temperature of the heating wire and the temperature of the gas passing through the tube to be measured independently.
  • the heating and sensor wires may be bound together by any suitable means. For example, they may simply be inter-engaged with one another - e.g. by twisting. Alternatively, they may be held together by a sleeve, tape, clips or the like. Since insertion of the heating wire assembly into the breathing tube may be carried out at the manufacturing stage, this may be optimised for maximum efficiency.
  • the invention provides a method of assembling a wire or wire assembly into a flexible ventilator tube comprising cooling said wire to a predetermined temperature in order to reduce its flexibility and inserting said wire axially into said flexible tube.
  • this novel procedure is beneficial in the insertion of wires generally into a flexible breathing tube, it is particularly beneficial when used with a heating wire assembly in accordance with the first aspect of the invention.
  • the appropriate degree of cooling will depend upon the materials present in the wire or wire assembly, particularly the insulation on the individual wire or wires.
  • Fig. 1 is a schematic view of a sensor sub-assembly for use in a heating wire assembly in accordance with the invention
  • Fig. 2 is a schematic circuit diagram showing how the two thermistors are connected
  • Fig. 3 is a schematic view of the heating wire assembly after insertion into a breathing tube.
  • Fig. 1 shows a thermal sensor sub-assembly 2.
  • At the distal end is a standard bead thermistor 4.
  • thermistor 4 Electrical connection to the thermistor 4 is made by a pair of insulated low voltage electrical wires comprising feed and return signal wires 6,8 respectively.
  • the signal wires 6,8 run the length of the sensor sub-assembly 2.
  • Towards the proximal end of the assembly is a further bead thermistor 10.
  • One side of this second thermistor 10 is connected electrically to the same signal feed wire 6 as the first thermistor 4.
  • the other side is connected to a third signal wire 12.
  • the electrical connections are shown schematically in Fig. 2. All three signal wires are terminated in a common three-pin connector 14 for connection to an existing temperature monitoring and power supply unit .
  • Fig. 3 shows the final heater wire assembly 16 in a breathing tube 18.
  • the sensor sub-assembly 2 of Fig. 1 is bound to a heating wire in the form of a single loop of insulated nickel- chromium resistance wire 20 which is terminated in a known two-pin electrical connector 22.
  • the heating wire 20 is bound at its distal end to the signal wires 6,8 of the sensor sub-assembly by means of a clip 24. Further clips may be provided along the length of the heater wire 20 as necessary. Additionally or alternatively, the heater wires 20 may be twisted together with the signal wires 6,8,12 to bind them together.
  • the breathing tube has standard Luer connectors 25 at either end.
  • the tube 18 is connected in use to a face mask or the like (not shown) for supplying the gas for a patient to breath.
  • a connector piece 26 which has an inlet port 26a for gas from a humidified gas source and two airtight grommets 28 through which the wires 6,8,12,20 pass to permit external access to the two electrical connectors 14,22.
  • the sensor sub-assembly is longer than the heating wire 20 so that the distal thermistor 4 is spaced from the looped end of the heating wire 20. This means that it will sense accurately the temperature of the gas being delivered to the patient without being directly influenced by the temperature of the heating wire 20.
  • the proximal thermistor 10 on the other end will be influenced by the temperature of the heater which provides for a safety backup that prevents the heater wire 20 becoming too hot and potentially melting the breathing tube in the event of a malfunction. Together the temperatures sensed at the two thermistors 4,10 may be used to regulate the electrical power to the heating wire to provide reliable rainout prevention whilst ensuring that gas is delivered to the patient at a constant comfortable temperature.
  • the heating wire 20 and sensor sub-assembly 2 are fabricated separately including the grommets 28 which are moulded onto the respective wires. The heating wire 20 and sensor sub-assembly 2 are then bound together by one or more clips 24 and/or twisted together.
  • the resultant wire assembly is then cooled to -20 C C so that it becomes stiff.
  • the assembly may then easily be inserted into the tube 18. Thereafter the grommets are pushed into apertures in the connector piece 26.
  • a sterile environment must be maintained during manufacture until the finished assembly has been packaged.
  • the whole of the arrangement shown in Fig. 3 may be made sufficiently inexpensively as to be disposable after a single use, thereby maximising hygiene.
  • the tube 18 simply needs to be connected into the breathing circuit by connecting it to a gas source and face mask as is well known in the art.
  • the two connectors 14,22 are then plugged into sockets on a corresponding power supply unit and the breathing circuit may be safely operated. Set up is therefore straightforward and intuitive.

Abstract

L'invention porte sur un ensemble de fils chauffants (16) permettant de réduire la condensation dans un tube respiratoire (18) délivrant à un patient un gaz humidifié pour que celui-ci respire. Cet ensemble comprend un fil chauffant électrorésistant (20), une pluralité de capteurs thermosensibles (4,10) situés en des points espacés le long du fil chauffant (20) et au moins un fil de transmission (6,8,12) raccordé à chacun des capteurs (4,10). Le fil chauffant (20) et les fils de transmission (6,8,12) sont terminés de façon à se raccorder au niveau d'une extrémité commune de l'ensemble et sont liés de façon à faciliter l'insertion de l'ensemble dans un tube respiratoire (18). L'invention porte également sur un procédé d'assemblage d'un fil (20) ou ensemble fils (16) dans un tube de ventilateur flexible (18) qui consiste à refroidir le fil (20) à une température prédéterminée afin de réduire sa flexibilité et à insérer le fil (20) axialement dans le tube flexible (18).
PCT/GB2004/003688 2003-08-28 2004-08-27 Element chauffant pour conduit de ventilateur WO2005021076A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0320194.4 2003-08-28
GB0320194A GB0320194D0 (en) 2003-08-28 2003-08-28 Heater for ventilator conduit

Publications (2)

Publication Number Publication Date
WO2005021076A2 true WO2005021076A2 (fr) 2005-03-10
WO2005021076A3 WO2005021076A3 (fr) 2005-04-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2004/003688 WO2005021076A2 (fr) 2003-08-28 2004-08-27 Element chauffant pour conduit de ventilateur

Country Status (2)

Country Link
GB (1) GB0320194D0 (fr)
WO (1) WO2005021076A2 (fr)

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006019323A1 (fr) * 2004-08-20 2006-02-23 Fisher & Paykel Healthcare Limited Appareil de mesure des propriétés des gaz administrés à un patient
WO2007069922A1 (fr) * 2005-12-15 2007-06-21 Fisher & Paykel Healthcare Limited Appareil d'assistance respiratoire
WO2007136343A1 (fr) * 2006-05-19 2007-11-29 Wilhelmsen Callenberg Fläkt Ab Système de ventilation et procédé correspondant
EP2079505A1 (fr) * 2006-11-08 2009-07-22 ResMed Ltd. Conduit destiné à être utilisé dans un appareil respiratoire
CN102125716A (zh) * 2010-01-19 2011-07-20 崇仁(厦门)医疗器械有限公司 具有感温变色片的传输管
WO2012087644A3 (fr) * 2010-12-21 2012-10-04 Carefusion 207, Inc. Barrière rayonnante pour circuits d'air chauffé
US8733349B2 (en) 2009-07-31 2014-05-27 Resmed Limited Wire heated tube with temperature control system, tube type detection, and active over temperature protection for humidifier for respiratory apparatus
CN104784800A (zh) * 2015-04-23 2015-07-22 刘茹涵 一种自动控温的呼吸长管加热装置
EP2613837A4 (fr) * 2010-09-10 2015-10-21 Carefusion 207 Inc Ajustement d'élément pour circuit respiratoire
US20160354573A1 (en) 2012-11-14 2016-12-08 Matthew Liam Buswell Zone heating for respiratory circuits
US9572949B2 (en) 2013-02-01 2017-02-21 Resmed Limited Wire heated tube with temperature control system for humidifier for respiratory apparatus
US9802022B2 (en) 2008-03-06 2017-10-31 Resmed Limited Humidification of respiratory gases
US10709866B2 (en) 2014-05-13 2020-07-14 Fisher & Paykel Healthcare Limited Usability features for respiratory humidification system
US10751498B2 (en) 2014-03-17 2020-08-25 Fisher & Paykel Healthcare Limited Medical tubes for respiratory systems
US10814091B2 (en) 2013-10-24 2020-10-27 Fisher & Paykel Healthcare Limited System for delivery of respiratory gases
US10828482B2 (en) 2013-12-20 2020-11-10 Fisher & Paykel Healthcare Limited Humidification system connections
US10960167B2 (en) 2015-09-09 2021-03-30 Fisher & Paykel Healthcare Limited Zone heating for respiratory circuits
US10974015B2 (en) 2012-03-15 2021-04-13 Fisher & Paykel Healthcare Limited Respiratory gas humidification system
US11013875B2 (en) 2005-08-15 2021-05-25 ResMed Pty Ltd Low cost CPAP flow generator and humidifier assembly
US11058844B2 (en) 2012-12-04 2021-07-13 Fisher & Paykel Healthcare Limited Medical tubes and methods of manufacture
US11129956B2 (en) 2012-04-27 2021-09-28 Fisher & Paykel Healthcare Limited Usability features for respiratory humidification system
US11173272B2 (en) 2014-05-02 2021-11-16 Fisher & Paykel Healthcare Limited Gas humidification arrangement
US11278689B2 (en) 2014-11-17 2022-03-22 Fisher & Paykel Healthcare Limited Humidification of respiratory gases
US11311695B2 (en) 2016-12-22 2022-04-26 Fisher & Paykel Healthcare Limited Medical tubes and methods of manufacture
US11318270B2 (en) 2011-06-03 2022-05-03 Fisher & Paykel Healthcare Limited Medical tubes and methods of manufacture
US11324911B2 (en) 2014-06-03 2022-05-10 Fisher & Paykel Healthcare Limited Flow mixers for respiratory therapy systems
US11351332B2 (en) 2016-12-07 2022-06-07 Fisher & Paykel Healthcare Limited Sensing arrangements for medical devices
WO2022180517A1 (fr) * 2021-02-26 2022-09-01 Fisher & Paykel Healthcare Limited Humidificateur respiratoire ou chirurgical et ses composants
US11511069B2 (en) 2013-09-13 2022-11-29 Fisher & Paykel Healthcare Limited Humidification system
US11559653B2 (en) 2014-02-07 2023-01-24 Fisher & Paykel Healthcare Limited Respiratory humidification system
US11596752B2 (en) 2012-04-05 2023-03-07 Fisher & Paykel Healthcare Limited Breathing assistance apparatus with serviceability features
US11801360B2 (en) 2013-09-13 2023-10-31 Fisher & Paykel Healthcare Limited Connections for humidification system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2284356A (en) * 1993-11-22 1995-06-07 Fisher & Paykel Respiratory humidifier conduit
DE19647548A1 (de) * 1996-11-16 1998-05-28 Bgm Buerk Ges Fuer Vertrieb Un Medizinische Vorrichtung zur Beheizung eines Atemgases

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2284356A (en) * 1993-11-22 1995-06-07 Fisher & Paykel Respiratory humidifier conduit
DE19647548A1 (de) * 1996-11-16 1998-05-28 Bgm Buerk Ges Fuer Vertrieb Un Medizinische Vorrichtung zur Beheizung eines Atemgases

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US11911564B2 (en) 2004-08-20 2024-02-27 Fisher & Paykel Healthcare Limited Apparatus for measuring properties of gases supplied to a patient
US10537698B2 (en) 2004-08-20 2020-01-21 Fisher & Paykel Healthcare Limited Apparatus for measuring properties of gases supplied to a patient
CN101018582A (zh) * 2004-08-20 2007-08-15 菲舍尔和佩克尔保健有限公司 用于测量供应给患者的气体的特性的装置
US11007340B2 (en) 2004-08-20 2021-05-18 Fisher & Paykel Healthcare Limited Apparatus for measuring properties of gases supplied to a patient
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US9265902B2 (en) 2004-08-20 2016-02-23 Fisher & Paykel Healthcare Limited Apparatus for measuring properties of gases supplied to a patient
WO2006019323A1 (fr) * 2004-08-20 2006-02-23 Fisher & Paykel Healthcare Limited Appareil de mesure des propriétés des gaz administrés à un patient
US8186345B2 (en) 2004-08-20 2012-05-29 Fisher & Paykel Healthcare Limited Apparatus for supplying gases to a patient
US11458273B2 (en) 2004-08-20 2022-10-04 Fisher & Paykel Healthcare Limited Apparatus for measuring properties of gases supplied to a patient
US8453641B2 (en) 2004-08-20 2013-06-04 Fisher & Paykel Healthcare Limited Apparatus for measuring properties of gases supplied to a patient
CN103143099A (zh) * 2004-08-20 2013-06-12 菲舍尔和佩克尔保健有限公司 用于测量供应给患者的气体的特性的装置
US11679224B2 (en) 2004-08-20 2023-06-20 Fisher & Paykel Healthcare Limited Apparatus for measuring properties of gases supplied to a patient
US10709865B2 (en) 2004-08-20 2020-07-14 Fisher & Paykel Healthcare Limited Apparatus for measuring properties of gases supplied to a patient
US11298482B2 (en) 2005-08-15 2022-04-12 ResMed Pty Ltd Low cost CPAP flow generator and humidifier assembly
US11013875B2 (en) 2005-08-15 2021-05-25 ResMed Pty Ltd Low cost CPAP flow generator and humidifier assembly
US9526807B2 (en) 2005-12-15 2016-12-27 Fisher & Paykel Healthcare Limited Breathing assistance apparatus
WO2007069922A1 (fr) * 2005-12-15 2007-06-21 Fisher & Paykel Healthcare Limited Appareil d'assistance respiratoire
US11576990B2 (en) 2005-12-15 2023-02-14 Fisher & Paykel Healthcare Limited Breathing assistance apparatus
US10512702B2 (en) 2005-12-15 2019-12-24 Fisher & Paykel Healthcare Limited Breathing assistance apparatus
US8741220B2 (en) 2005-12-15 2014-06-03 Fisher & Paykel Healthcare Limited Breathing assistance apparatus
CN101479534B (zh) * 2006-05-19 2011-06-15 威廉森卡伦贝格弗莱克特股份公司 通风系统和方法
WO2007136343A1 (fr) * 2006-05-19 2007-11-29 Wilhelmsen Callenberg Fläkt Ab Système de ventilation et procédé correspondant
EP4166184A1 (fr) * 2006-11-08 2023-04-19 ResMed Pty Ltd Appareil respiratoire
EP2079505A1 (fr) * 2006-11-08 2009-07-22 ResMed Ltd. Conduit destiné à être utilisé dans un appareil respiratoire
US9855398B2 (en) 2006-11-08 2018-01-02 Resmed Limited Humidifier for respiratory apparatus
EP4176915A1 (fr) * 2006-11-08 2023-05-10 ResMed Pty Ltd Appareil respiratoire
CN110141752A (zh) * 2006-11-08 2019-08-20 瑞思迈私人有限公司 在呼吸装置中使用的导管
US11338104B2 (en) 2006-11-08 2022-05-24 ResMed Pty Ltd Humidifier for respiratory apparatus
US11712535B2 (en) 2006-11-08 2023-08-01 ResMed Pty Ltd Humidifier for respiratory apparatus
EP3782688A1 (fr) * 2006-11-08 2021-02-24 ResMed Pty Ltd Appareil respiratoire
EP2079505A4 (fr) * 2006-11-08 2013-10-02 Resmed Ltd Conduit destiné à être utilisé dans un appareil respiratoire
US9802022B2 (en) 2008-03-06 2017-10-31 Resmed Limited Humidification of respiratory gases
US8733349B2 (en) 2009-07-31 2014-05-27 Resmed Limited Wire heated tube with temperature control system, tube type detection, and active over temperature protection for humidifier for respiratory apparatus
US11033698B2 (en) 2009-07-31 2021-06-15 ResMed Pty Ltd Wire heated tube with temperature control system, tube type detection, and active over temperature protection for humidifier for respiratory apparatus
AU2010206053B2 (en) * 2009-07-31 2014-08-07 ResMed Pty Ltd Wire Heated Tube with Temperature Control System, Tube Type Detection, and Active Over Temperature Protection for Humidifier for Respiratory Apparatus
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US10086158B2 (en) 2009-07-31 2018-10-02 Resmed Limited Wire heated tube with temperature control system, tube type detection, and active over temperature protection for humidifier for respiratory apparatus
US11607512B2 (en) 2009-07-31 2023-03-21 ResMed Pty Ltd Wire heated tube with temperature control system, tube type detection, and active over temperature protection for humidifier for respiratory apparatus
CN102125716A (zh) * 2010-01-19 2011-07-20 崇仁(厦门)医疗器械有限公司 具有感温变色片的传输管
EP2613837A4 (fr) * 2010-09-10 2015-10-21 Carefusion 207 Inc Ajustement d'élément pour circuit respiratoire
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US10363382B2 (en) 2013-02-01 2019-07-30 ResMed Pty Ltd Wire heated tube with temperature control system for humidifier for respiratory apparatus
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US9572949B2 (en) 2013-02-01 2017-02-21 Resmed Limited Wire heated tube with temperature control system for humidifier for respiratory apparatus
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US10751498B2 (en) 2014-03-17 2020-08-25 Fisher & Paykel Healthcare Limited Medical tubes for respiratory systems
US11173272B2 (en) 2014-05-02 2021-11-16 Fisher & Paykel Healthcare Limited Gas humidification arrangement
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US11712536B2 (en) 2014-06-03 2023-08-01 Fisher & Paykel Healthcare Limited Flow mixers for respiratory therapy systems
US11278689B2 (en) 2014-11-17 2022-03-22 Fisher & Paykel Healthcare Limited Humidification of respiratory gases
CN104784800A (zh) * 2015-04-23 2015-07-22 刘茹涵 一种自动控温的呼吸长管加热装置
US10960167B2 (en) 2015-09-09 2021-03-30 Fisher & Paykel Healthcare Limited Zone heating for respiratory circuits
US11351332B2 (en) 2016-12-07 2022-06-07 Fisher & Paykel Healthcare Limited Sensing arrangements for medical devices
US11311695B2 (en) 2016-12-22 2022-04-26 Fisher & Paykel Healthcare Limited Medical tubes and methods of manufacture
WO2022180517A1 (fr) * 2021-02-26 2022-09-01 Fisher & Paykel Healthcare Limited Humidificateur respiratoire ou chirurgical et ses composants

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Publication number Publication date
GB0320194D0 (en) 2003-10-01
WO2005021076A3 (fr) 2005-04-21

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