WO2003055554A1 - A conduit for delivering air to a mask - Google Patents

A conduit for delivering air to a mask Download PDF

Info

Publication number
WO2003055554A1
WO2003055554A1 PCT/AU2002/001756 AU0201756W WO03055554A1 WO 2003055554 A1 WO2003055554 A1 WO 2003055554A1 AU 0201756 W AU0201756 W AU 0201756W WO 03055554 A1 WO03055554 A1 WO 03055554A1
Authority
WO
WIPO (PCT)
Prior art keywords
conduit
source
electrical
heat
power supply
Prior art date
Application number
PCT/AU2002/001756
Other languages
French (fr)
Inventor
Brian John Henry Richardson
Donald Leslie Herbert Fischer
Original Assignee
Brian John Henry Richardson
Donald Leslie Herbert Fischer
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 Brian John Henry Richardson, Donald Leslie Herbert Fischer filed Critical Brian John Henry Richardson
Priority to AU2002351882A priority Critical patent/AU2002351882A1/en
Publication of WO2003055554A1 publication Critical patent/WO2003055554A1/en

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. ventilators; Tracheal tubes
    • A61M16/08—Bellows; Connecting tubes ; Water traps; Patient circuits
    • 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. ventilators; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/1075—Preparation of respiratory gases or vapours by influencing the temperature
    • A61M16/1085—Preparation of respiratory gases or vapours by influencing the temperature after being humidified or mixed with a 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
    • 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

  • the present invention relates to a conduit for delivering air to a mask that may be used in treatment of obstructive sleep apnoea.
  • Continuous Positive Airway Pressure (C.P.A.P.) is an effective treatment for Obstructive Sleep Apnoea.
  • C.P.A.P. device delivers a positive pressure on airways of a patient.
  • the positive pressure acts as an "air splint" which keeps the patients airways open to avoid cessation of breathing related to airway closure that may occur in various stages during the patient's sleep.
  • the airflow in such a C.P.A.P device may be relatively high and may rapidly remove moisture from the airways.
  • the resultant drying-effect may cause discomfort for the patient and a high proportion of C.P.A.P. users complain of upper airway and nasal drying and other discomforting symptoms.
  • the present invention provides a conduit for delivering air to a mask, the conduit comprising:
  • the present invention also provides conduit for delivering air to a mask, the conduit comprising:
  • standard low voltage power supply refers to a low voltage transformer that is typically used a as a power source for small electronic devices .
  • the present invention further provides a conduit for delivering air to a mask, the conduit comprising:
  • the present invention even further provides a method of delivering air to a mask comprising the steps of:
  • the heat-source preferably is provided in form of at least one electrical wire.
  • the or each electrical wire preferably is positioned near or on a surface of the conduit and most preferably is wound around an outer surface of the conduit.
  • the conduit preferably is provided in form of a hose and the or each electrical wire preferably is wound substantially helically around the outer surface of the conduit .
  • a pair of generally parallel wires or a loop of continuous wire are wound substantially helically around the conduit.
  • the power supply preferably is a low voltage power supply such a ac transformer that may deliver a voltage of less that 20 Volts, preferably about 12 Volts.
  • the resistivity of the heat-source and the insulation properties of the insulating layer are selected such that the power provided by a standard low-voltage power supply is sufficient to provide the predetermined heat output.
  • the resistivity of the electrical heat-source and the insulation properties of the insulating layer are selected such that, in use, at least a portion of the conduit have a temperature approximately 10° above ambient room temperature.
  • the or each wire preferably is a copper wire that may comprise an insulation layer.
  • the or each copper wire preferably is attached to the outside of the conduit by means of adhesive.
  • the conduit may take any form, but preferably is provided in form of a hose.
  • the hose preferably comprises a polymeric material that is flexible.
  • the hose may comprise a helical spiral that is associated with the outer surface of the hose and arranged to provide stability and/or flexibility.
  • the hose most preferably is composed of a transparent material .
  • the insulating layer of the conduit preferably is removably attached to the conduit.
  • the insulating layer most preferably is provided in form of a sleeve that can be pulled over the outside of the conduit.
  • the insulating layer may comprise a fabric. In a preferred embodiment, the insulating layer comprises at least two layers of the fabric which sandwich a layer of a foam-like insulation material .
  • the resistivity preferably is selected so as to prevent moisture condensation within the conduit.
  • Figure 1 shows a schematic representation of a conduit for delivering air to a mask according to a preferred embodiment of the invention
  • Figure 2 shows a schematic representation of the conduit for delivering air to a mask according another preferred embodiment of the invention.
  • the Figure shows the conduit 10 having two ends 12 and 13 arranged for connection to a mask and to receive humidified and warmed air respectively.
  • the conduit is provided as a hose and comprises a polymeric material that is flexible and transparent.
  • the hose is of substantially round cross- section.
  • a loop 16 of a copper wire is wound around the hose.
  • the wire comprises a copper core that is surrounded by an insulating layer of an enamel material .
  • the ends of the loop 16 are connected to a socket 18.
  • the core of the loop 16 of the wire has a diameter of 0.3 mm and a length of approximately 40m.
  • the resultant resistivity is approximately 12 ohms.
  • the ends of the loop 16 are glued onto the outer surface of the hose.
  • the socket 18 is arranged for connection to a low voltage power supply 20.
  • the dimensions of the wire of the loop 16 are selected such that a predetermined elevated temperature of the conduit can be established and maintained.
  • the low-voltage power supply 20 delivers a voltage of 12 volts.
  • the predetermined temperature is approximately 10° above ambient room temperature.
  • Figure 2 shows the conduit 20 according to another preferred embodiment of the invention.
  • the conduit is provided as a hose and an insulating sleeve 22 surrounds the hose.
  • the insulating sleeve 22 comprises a lightweight- foam material that is sandwiched between layers of a fabric material .

Landscapes

  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Pulmonology (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Pipe Accessories (AREA)

Abstract

The present invention provides a conduit for delivering air from a humidifier to a mask. The conduit comprises an electrical heat-source for for providing a heat output for heating the conduit, a means for connecting the electrical heat-source to the power supply, and an insulating layer at least in part surrounding the conduit. The heat-source has an electrical resistivity and the insulating layer has insulation properties that are selected such that the power provided by a standard low voltage power supply is sufficient to provide the predetermined heat output.

Description

A CONDUIT FOR DELIVERING AIR TO A MASK
Field of the Invention
The present invention relates to a conduit for delivering air to a mask that may be used in treatment of obstructive sleep apnoea.
Background of the Invention
Continuous Positive Airway Pressure (C.P.A.P.) is an effective treatment for Obstructive Sleep Apnoea. A
C.P.A.P. device delivers a positive pressure on airways of a patient. The positive pressure acts as an "air splint" which keeps the patients airways open to avoid cessation of breathing related to airway closure that may occur in various stages during the patient's sleep.
The airflow in such a C.P.A.P device may be relatively high and may rapidly remove moisture from the airways. The resultant drying-effect may cause discomfort for the patient and a high proportion of C.P.A.P. users complain of upper airway and nasal drying and other discomforting symptoms.
It is recognized that the use of warmed humidification is a valuable aid in the compliance of sleep Apnoea patients. Intervention with the use of adjustable artificial humidification, delivered by a specialized humidifier, which is an attachment to the C.P.A.P. device, improves patient comfort. The nasal mucosa is responsible for heating and humidifying the air breathed in, but with the increased pressure flow of C.P.A.P.. The patient's natural ability to humidify inspired air is overwhelmed, resulting in the mucosa becoming dehydrated irritated and swollen. Humidification maintains airway mucosa moisture and hydration thereby minimizing discomfort. However, water condenses in the air delivery tubing between the humidifier and a mask worn by the patient. The condensed water is eventually collected in the mask which also causes discomfort or even danger for the patient as the patient breathes through the mask. Further, sleep may be disturbed by a gurgling sound that may result from the water accumulation in the mask.
Summary of the Invention The present invention provides a conduit for delivering air to a mask, the conduit comprising:
• an electrical heat-source for heating the conduit,
• a means for connecting the electrical heat-source to a power supply, and • an insulating layer at least in part surrounding the conduit . The inventors have observed that condensation of moisture is a consequence of a temperature gradient that typically exists between the warmed humidified air inside an air delivery tubing of a typical C.P.A.P. device and the ambient room temperature which usually is lower than that of the warmed and humidified air in the tubing. In use, the above-defined conduit is warmed whereby the temperature gradient between the warmed and humidified air inside the conduit and the conduit itself is reduced which reduces the condensation.
The present invention also provides conduit for delivering air to a mask, the conduit comprising:
• an electrical heat-source for providing a predetermined heat output for heating at least a portion of the conduit, and
• a means for connecting the electrical heat-source to a power supply wherein the heat-source has a resistivity that is selected such that the power provided by a standard low-voltage power supply is sufficient to provide the predetermined heat output . Throughout this specification, the term "standard low voltage power supply" refers to a low voltage transformer that is typically used a as a power source for small electronic devices .
The present invention further provides a conduit for delivering air to a mask, the conduit comprising:
• an electrical heat-source for providing a predetermined heat output for heating at least a portion of the conduit, • a means for connecting the electrical heat-source to a power supply and
• an insulating layer at least in part surrounding the conduit wherein the heat-source has an electrical resistivity and the insulating layer has insulation properties that are selected such that the power provided by a standard low- voltage power supply is sufficient to provide the predetermined heat output .
The present invention even further provides a method of delivering air to a mask comprising the steps of:
• guiding the air through a conduit, and
• heating the conduit using an electrical heat source that a resistivity that is selected such that the power provided by a standard low-voltage power supply is sufficient to provide the predetermined heat output .
Preferred Features of the Invention The heat-source preferably is provided in form of at least one electrical wire. The or each electrical wire preferably is positioned near or on a surface of the conduit and most preferably is wound around an outer surface of the conduit. The conduit preferably is provided in form of a hose and the or each electrical wire preferably is wound substantially helically around the outer surface of the conduit . In a preferred form, a pair of generally parallel wires or a loop of continuous wire are wound substantially helically around the conduit.
The power supply preferably is a low voltage power supply such a ac transformer that may deliver a voltage of less that 20 Volts, preferably about 12 Volts. The resistivity of the heat-source and the insulation properties of the insulating layer are selected such that the power provided by a standard low-voltage power supply is sufficient to provide the predetermined heat output. In a preferred embodiment of the invention, the resistivity of the electrical heat-source and the insulation properties of the insulating layer are selected such that, in use, at least a portion of the conduit have a temperature approximately 10° above ambient room temperature.
The or each wire preferably is a copper wire that may comprise an insulation layer. The or each copper wire preferably is attached to the outside of the conduit by means of adhesive.
The conduit may take any form, but preferably is provided in form of a hose. The hose preferably comprises a polymeric material that is flexible. The hose may comprise a helical spiral that is associated with the outer surface of the hose and arranged to provide stability and/or flexibility. The hose most preferably is composed of a transparent material . The insulating layer of the conduit preferably is removably attached to the conduit. The insulating layer most preferably is provided in form of a sleeve that can be pulled over the outside of the conduit. The insulating layer may comprise a fabric. In a preferred embodiment, the insulating layer comprises at least two layers of the fabric which sandwich a layer of a foam-like insulation material .
In the above-defined method the resistivity preferably is selected so as to prevent moisture condensation within the conduit.
Brief Description of the Drawings
Figure 1 shows a schematic representation of a conduit for delivering air to a mask according to a preferred embodiment of the invention and
Figure 2 shows a schematic representation of the conduit for delivering air to a mask according another preferred embodiment of the invention. i
Detailed Description of a Preferred Embodiment of the Invention
Referring to Figure 1, the conduit is now described. The Figure shows the conduit 10 having two ends 12 and 13 arranged for connection to a mask and to receive humidified and warmed air respectively. The conduit is provided as a hose and comprises a polymeric material that is flexible and transparent. The hose is of substantially round cross- section. A spiral 14, also composed of a polymeric material, forms an integral part of the hose and provides rigidity. A loop 16 of a copper wire is wound around the hose. The wire comprises a copper core that is surrounded by an insulating layer of an enamel material . The ends of the loop 16 are connected to a socket 18. The core of the loop 16 of the wire has a diameter of 0.3 mm and a length of approximately 40m. The resultant resistivity is approximately 12 ohms. The ends of the loop 16 are glued onto the outer surface of the hose. The socket 18 is arranged for connection to a low voltage power supply 20. The dimensions of the wire of the loop 16 are selected such that a predetermined elevated temperature of the conduit can be established and maintained. The low-voltage power supply 20 delivers a voltage of 12 volts. When the loop 16 of copper wire is connected to the low voltage power supply 20, the temperature rises on the surface of the hose to a predetermined temperature that is sufficient to reduce or prevent condensation of moisture within the conduit. In the preferred form the predetermined temperature is approximately 10° above ambient room temperature.
Figure 2 shows the conduit 20 according to another preferred embodiment of the invention. Again, the conduit is provided as a hose and an insulating sleeve 22 surrounds the hose. The insulating sleeve 22 comprises a lightweight- foam material that is sandwiched between layers of a fabric material .
Although the invention has been described with reference to particular examples, it will be appreciated by those skilled in the art that the invention may be embodied in many other forms .

Claims

Claims :
1. A conduit for delivering air to a mask, the conduit comprising:
• an electrical heat-source for heating the conduit,
• a means for connecting the electrical heat-source to a power supply, and
• an insulating layer at least in part surrounding the conduit .
2. A conduit for delivering air to a mask, the conduit comprising:
• an electrical heat-source for providing a predetermined heat output for heating at least a portion of the conduit, and
• a means for connecting the electrical heat-source to a power supply wherein the heat-source has a resistivity that is selected such that the power provided by a standard low-voltage power supply is sufficient to provide the predetermined heat output .
3. A conduit for delivering air to a mask, the conduit comprising: • an electrical heat-source for providing a predetermined heat output for heating at least a portion of the conduit,
• a means for connecting the electrical heat-source to a power supply and • an insulating layer at least in part surrounding the conduit wherein the heat-source has an electrical resistivity and the insulating layer has insulation properties that are selected such that the power provided by a standard low- voltage power supply is sufficient to provide the predetermined heat output .
4. The conduit as claimed in claim 3 wherein the resistivity of the heat-source and the insulation properties of the insulating layer are selected such that the power provided by a standard low-voltage power supply is sufficient to provide the predetermined heat output.
5. The conduit as claimed in any one of claims 1 to 4 wherein the heat-source is provided in form of at least one electrical wire.
6. The conduit as claimed in claim 5 wherein the or each electrical wire is positioned on an external surface of the conduit .
7. The conduit as claimed in claim 5 or 6 wherein the or each electrical wire is wound around the external surface of the conduit for the length thereof .
8. The conduit as claimed in any one of the preceding claims being provided as a hose.
9 The conduit as claimed in claim 8 when dependent on claims 5 to 7 wherein the or each electrical wire is wound in a substantially helical pattern around at least a portion of the external surface of the hose.
10. The conduit as claimed in any one of claims 5 to 7 wherein the or each electrical wire is provided as a pair of generally parallel wires.
11. The conduit as claimed in claim 10 wherein the pair of generally parallel wires is wound in a substantially helical pattern around the external surface of the hose.
12. The conduit as claimed in any one of claims 5 to 7 wherein the or each electrical wire is provided as a loop of continuos wire.
13. The conduit as claimed in claim 12 wherein the loop of continuos wire is wound in a substantially helical pattern around the external surface of the hose .
14. The conduit as claimed in any one of claims 5 to 7 or claims 8 to 13 when dependent on claims 5 to 7 wherein the or each electrical wire is a copper wire.
15. The conduit as claimed in any one of claims 5 to 7 or claims 8 to 14 when dependant on claims 5 to 7 wherein the or each electrical wire comprises an insulation layer.
16. The conduit as claimed in any one of claims 5 to 7 or claims 8 to 15 when dependant on claims 5 to 7 wherein the or each electrical wire is attached to the outside of the conduit by means of adhesive.
17. The conduit as claimed in any one of claims 12 or 13 wherein the loop of continuous wire is glued to the hose at ends of the loop.
18. The conduit as claimed in claim 1 or any one of claims 4 to 17 when dependent on claim 1 or 3 wherein the insulating layer is removably attached to the conduit.
19. The conduit as claimed in claim 18 wherein the insulating layer is provided as a sleeve that can be pulled over the outside of the conduit.
20. The conduit as claimed in claim 18 or 19 wherein the insulating layer comprises a fabric.
21. The conduit as claimed in claim 20 wherein the insulating layer comprises at least two layers of the fabric which sandwich a layer of a foam-like insulation material .
22. The conduit as claimed in any one of the preceding claims comprising a polymeric material that is flexible.
23. The conduit as claimed in claim 1 wherein the power supply is a low voltage power supply.
24. A method of delivering air to a mask comprising the steps of :
• guiding the air through a conduit, and
• heating the conduit using an electrical heat source that a resistivity that is selected such that the power provided by a standard low-voltage power supply is sufficient to provide the predetermined heat output .
25. The method as claimed in claim 24 wherein the resistivity is selected so as to prevent moisture condensation within the conduit .
PCT/AU2002/001756 2001-12-16 2002-12-20 A conduit for delivering air to a mask WO2003055554A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002351882A AU2002351882A1 (en) 2001-12-16 2002-12-20 A conduit for delivering air to a mask

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2001100648A AU2001100648A4 (en) 2001-12-16 2001-12-16 Air delivery tubing warmer
AU2001100648 2001-12-21

Publications (1)

Publication Number Publication Date
WO2003055554A1 true WO2003055554A1 (en) 2003-07-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2002/001756 WO2003055554A1 (en) 2001-12-16 2002-12-20 A conduit for delivering air to a mask

Country Status (2)

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AU (1) AU2001100648A4 (en)
WO (1) WO2003055554A1 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1743672A1 (en) * 2005-07-12 2007-01-17 Deas S.R.L. Flexible duct with devices for heating the conveyed stream
WO2007045928A1 (en) * 2005-10-20 2007-04-26 Intersurgical Ag Ventilation tubes
WO2008055308A1 (en) 2006-11-08 2008-05-15 Resmed Ltd Conduit for use in a respiratory apparatus
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
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
US11013875B2 (en) 2005-08-15 2021-05-25 ResMed Pty Ltd Low cost CPAP flow generator and humidifier assembly
US12053587B2 (en) 2012-11-14 2024-08-06 Fisher & Paykel Healthcare Limited Zone heating for respiratory circuits
US12233212B2 (en) 2021-02-18 2025-02-25 Fisher & Paykel Healthcare Limited Zone heating for respiratory circuits

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3730551A1 (en) * 1987-09-11 1989-03-30 Annedore Kinnle Med Techn Zube Respiratory gas humidifier
US5357948A (en) * 1992-01-18 1994-10-25 Heinz Eilentropp Heatable respiratory hose
US5640951A (en) * 1994-03-15 1997-06-24 Fisher & Paykel Limited Humidifier conduit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3730551A1 (en) * 1987-09-11 1989-03-30 Annedore Kinnle Med Techn Zube Respiratory gas humidifier
US5357948A (en) * 1992-01-18 1994-10-25 Heinz Eilentropp Heatable respiratory hose
US5640951A (en) * 1994-03-15 1997-06-24 Fisher & Paykel Limited Humidifier conduit

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1743672A1 (en) * 2005-07-12 2007-01-17 Deas S.R.L. Flexible duct with devices for heating the conveyed stream
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
US8726901B2 (en) 2005-10-20 2014-05-20 Intersurgical Ag Ventilation tubes
WO2007045928A1 (en) * 2005-10-20 2007-04-26 Intersurgical Ag Ventilation tubes
US11338104B2 (en) 2006-11-08 2022-05-24 ResMed Pty Ltd Humidifier for respiratory apparatus
EP2079505A1 (en) * 2006-11-08 2009-07-22 ResMed Ltd. Conduit for use in a respiratory apparatus
AU2007317198B2 (en) * 2006-11-08 2013-08-22 ResMed Pty Ltd Conduit for use in a respiratory apparatus
US11712535B2 (en) 2006-11-08 2023-08-01 ResMed Pty Ltd Humidifier for respiratory apparatus
EP2079505A4 (en) * 2006-11-08 2013-10-02 Resmed Ltd Conduit for use in a respiratory apparatus
US9855398B2 (en) 2006-11-08 2018-01-02 Resmed Limited Humidifier for respiratory apparatus
EP4166184A1 (en) * 2006-11-08 2023-04-19 ResMed Pty Ltd Respiratory apparatus
WO2008055308A1 (en) 2006-11-08 2008-05-15 Resmed Ltd Conduit for use in a respiratory apparatus
JP2010508875A (en) * 2006-11-08 2010-03-25 レスメド・リミテッド Conduit for use in respiratory equipment
US9802022B2 (en) 2008-03-06 2017-10-31 Resmed Limited Humidification of respiratory gases
US11707587B2 (en) 2009-07-31 2023-07-25 ResMed Pty Ltd 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
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
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
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
US12201768B2 (en) 2009-07-31 2025-01-21 ResMed Pty Ltd Wire heated tube with temperature control system, tube type detection, and active over temperature protection for humidifier for respiratory apparatus
US12053587B2 (en) 2012-11-14 2024-08-06 Fisher & Paykel Healthcare Limited Zone heating for respiratory circuits
US11260186B2 (en) 2013-02-01 2022-03-01 ResMed Pty Ltd Wire heated tube with temperature control system for humidifier for respiratory apparatus
US10363382B2 (en) 2013-02-01 2019-07-30 ResMed Pty Ltd Wire heated tube with temperature control system for humidifier for respiratory apparatus
US9572949B2 (en) 2013-02-01 2017-02-21 Resmed Limited Wire heated tube with temperature control system for humidifier for respiratory apparatus
US11779719B2 (en) 2013-02-01 2023-10-10 ResMed Pty Ltd Wire heated tube with temperature control system for humidifier for respiratory apparatus
US12233212B2 (en) 2021-02-18 2025-02-25 Fisher & Paykel Healthcare Limited Zone heating for respiratory circuits

Also Published As

Publication number Publication date
AU2001100648A9 (en) 2002-02-07
AU2001100648A4 (en) 2002-01-17

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