WO2008148151A1 - Cpap filter - Google Patents

Cpap filter Download PDF

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Publication number
WO2008148151A1
WO2008148151A1 PCT/AU2008/000793 AU2008000793W WO2008148151A1 WO 2008148151 A1 WO2008148151 A1 WO 2008148151A1 AU 2008000793 W AU2008000793 W AU 2008000793W WO 2008148151 A1 WO2008148151 A1 WO 2008148151A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
gas
filter system
receptacle
filtering
Prior art date
Application number
PCT/AU2008/000793
Other languages
French (fr)
Inventor
Alexander Pieri
Original Assignee
Compumedics Medical Innovation Pty Ltd
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 AU2007903098A external-priority patent/AU2007903098A0/en
Application filed by Compumedics Medical Innovation Pty Ltd filed Critical Compumedics Medical Innovation Pty Ltd
Publication of WO2008148151A1 publication Critical patent/WO2008148151A1/en

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M16/00Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10Preparation of respiratory gases or vapours
    • A61M16/105Filters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0002Casings; Housings; Frame constructions
    • B01D46/0012In-line filters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M2205/00General characteristics of the apparatus
    • A61M2205/60General characteristics of the apparatus with identification means
    • A61M2205/6045General characteristics of the apparatus with identification means having complementary physical shapes for indexing or registration purposes
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M2205/00General characteristics of the apparatus
    • A61M2205/75General characteristics of the apparatus with filters
    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62BDEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B23/00Filters for breathing-protection purposes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2275/00Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/20Shape of filtering material
    • B01D2275/206Special forms, e.g. adapted to a certain housing

Definitions

  • This invention relates to filters for gas streams.
  • the invention relates to in-line filters for gas-delivery devices for delivering gasses to patients.
  • CPAP continuous positive air pressure
  • Figure 1 shows a side perspective view of an embodiment of the components of a gas filter.
  • Figure 2 shows a side perspective view of an embodiment of gas filter system.
  • Figure 3 shows a transverse section of a gas filter being positioned in a receptacle.
  • Figure 4 shows a transverse section of a gas filter positioned for operation.
  • the present invention provides a filtering means that is tapered from the insertion end to the opposite end and a receptacle for the filtering means that is similarly tapered. This arrangement provides an effective filter that is easy to insert into its receptacle, the receptacle having a complementary shape and dimension.
  • the material of the filtering means may be any appropriate material known in the art to be useful for removing particulate matter resulting in minimal loss of efficiency of filtration while enhancing the insertion and removal of the filter from its receptacle.
  • the invention provides a filter system for a gas stream, the filtering means having a first end and second end, the first end forming a substantially obtuse angle with a side of the filtering means and the second end forming a substantially acute angle with the side of the filtering means and a receptacle having a complementary shape for engaging the filtering means.
  • the filtering means may have at least a portion of a side tapering substantially smoothly from the first substantially obtuse angle to a spaced portion of the side of the filtering means.
  • the filtering means may taper from the first end to the second end, the taper being smooth or stepped.
  • the invention provides a filter system for a gas stream, comprising a filtering means having a trapezoidal shape; and a receptacle having a complementary shape for engaging the filter.
  • the filter system may be located in the air stream of a gas-delivery device for delivering gas to the nose of a subject.
  • the invention provides a filter system for a gas stream, comprising a filtering means having a first end smaller in cross section than a second end; and a receptacle having a complementary shape for engaging the filter means. A portion of a side of the filter means may tapers substantially smoothly from.
  • the filter system of may be located in the gas stream of a gas-delivery device for delivering gas to the nose of a subject.
  • the invention provides a method of filtering the gas in a gas- delivery device for delivering gas to the nose of a subject, comprising the steps of; engaging a filtering means having a generally trapezoidal shape into a receptacle of complementary shape; and placing the resulting filtering system in the path of the gas stream of said gas-delivery device.
  • Figure 1 shows in side perspective view a filter 2 and receptacle 1 which comprise a filter apparatus for a gas-delivery system.
  • a first end 3 of the filter 2 has a first width or cross sectional area, which tapers along an outer surface 7 to a second insertion end 4 having a second width of the filter 2.
  • the outer surfaces of the insertion end and the side walls form a generally obtuse angle and the inner surfaces of the corresponding walls of the receptacle 1 form a corresponding angle while the surface of the distal end of the filter and the side surfaces form a generally acute angle.
  • the receptacle 1 has a corresponding width at a first end 5 which tapers along a side surface 8 to a second corresponding width 6.
  • the taper of the side walls may be stepped as well as smooth, as long as the insertion end of the filter is smaller in width or cross sectional area than the distal end 3.
  • Figure 1 shows that both sides 7, 9 of the filter 2 taper from the first end to the second end.
  • the scope of the invention includes that a single side of the filter to be tapered from the first end to the second end.
  • the filter may be generally cone-shaped.
  • the taper results from the insertion end 4 forming an acute angle with the side 7.
  • both sides 7 of the filter taper to the insertion end 4.
  • the receptacle 1 has a corresponding taper to the filter 2 from a first end to a second end.
  • the filter is an essentially trapezoidal shape when viewed from an end of the filter and receptacle provide a simple but effective means to filter air but which is simple and easy to remove for cleaning and replacement.
  • the invention includes embodiments where there sides of the shape are stepped in width, reducing from one end to the insertion end.
  • the clearance 14, shown in Figure 3 between the outside surface of the filter 2 and the inside surface of the receptacle 1 is minimised.
  • the outside surfaces of the filter 2 are essentially smooth planes. This arrangement helps to minimise any channelling or air flow around the edges of the filter in passing through the receptacle. Any channelling reduces the effectiveness of the filtration.
  • the taper of the filter most advantageously requires little insertion force in engaging the filter with its receptacle.
  • the maximum force required to position the filter occurs as the filter engages the inside faces 15 of the receptacle.

Landscapes

  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Engineering & Computer Science (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Pulmonology (AREA)
  • Emergency Medicine (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)

Abstract

The present invention provides a filter system for filtering gas streams. The filter system comprises of a shaped filter means, which can be any suitable filter for filtering particles from gas steams, and a receptacle having a complementary shape, the filter means and receptacle having one end with a smaller cross section than another end. Preferably, a side of the filter means is tapered from the larger cross section end to the smaller cross section end. The filter system may take many shapes, including trapezoidal and cylindrical shapes. Preferably, the filter system is incorporated into a gas-delivery device for delivering gases to the nose of a subject.

Description

Title
CPAP Filter
Field of the Invention
This invention relates to filters for gas streams. In particular, the invention relates to in-line filters for gas-delivery devices for delivering gasses to patients.
Background
There are a number of commercial devices available for delivering breathable gas to a patient for the treatment of sleep disordered breathing. For example, in the treatment of obstructive sleep apnoea, air is often delivered at continuous positive air pressure (CPAP) wherein air is supplied continuously at a pressure greater than ambient to the nose of a sleeping patient through a mask to keep the patient's airways open for effective respiration.
It is important for that the air and other gases delivered for treatment of sleep- disordered breathing to be as pure as possible and not to include particulate contaminants such as dust and micro-organisms, both of which could result in unintended consequences for a patient. It is known to filter the input air for a CPAP gas-delivery system, such as that which is described in patent application WO 2007/045017 and other systems and devices as known in the art. What is needed is a gas filter for a CPAP device that is effective in removing impurities but is also easy to remove for cleaning and replacement as needed.
Brief Description of the Figures
Figure 1 shows a side perspective view of an embodiment of the components of a gas filter.
Figure 2 shows a side perspective view of an embodiment of gas filter system.
Figure 3 shows a transverse section of a gas filter being positioned in a receptacle.
Figure 4 shows a transverse section of a gas filter positioned for operation. Summary of the Invention
Currently available gas filters for CPAP devices and other gas-delivery devices incorporate substantially parallel faces of filters that are inserted into receptacles having substantially parallel engaging faces. It is an object of the invention to provide a gas filter that is effective for removing particulate matter from a gas stream but also easy to remove for cleaning or replacement. The present invention provides a filtering means that is tapered from the insertion end to the opposite end and a receptacle for the filtering means that is similarly tapered. This arrangement provides an effective filter that is easy to insert into its receptacle, the receptacle having a complementary shape and dimension. The material of the filtering means may be any appropriate material known in the art to be useful for removing particulate matter resulting in minimal loss of efficiency of filtration while enhancing the insertion and removal of the filter from its receptacle.
In one aspect the invention provides a filter system for a gas stream, the filtering means having a first end and second end, the first end forming a substantially obtuse angle with a side of the filtering means and the second end forming a substantially acute angle with the side of the filtering means and a receptacle having a complementary shape for engaging the filtering means. The filtering means may have at least a portion of a side tapering substantially smoothly from the first substantially obtuse angle to a spaced portion of the side of the filtering means. The filtering means may taper from the first end to the second end, the taper being smooth or stepped.
In second aspect, the invention provides a filter system for a gas stream, comprising a filtering means having a trapezoidal shape; and a receptacle having a complementary shape for engaging the filter. The filter system may be located in the air stream of a gas-delivery device for delivering gas to the nose of a subject.
In a third aspect, the invention provides a filter system for a gas stream, comprising a filtering means having a first end smaller in cross section than a second end; and a receptacle having a complementary shape for engaging the filter means. A portion of a side of the filter means may tapers substantially smoothly from. The filter system of may be located in the gas stream of a gas-delivery device for delivering gas to the nose of a subject. In a further aspect, the invention provides a method of filtering the gas in a gas- delivery device for delivering gas to the nose of a subject, comprising the steps of; engaging a filtering means having a generally trapezoidal shape into a receptacle of complementary shape; and placing the resulting filtering system in the path of the gas stream of said gas-delivery device.
Detailed Description of the Drawings and Most Preferred Embodiments
In this document a reference to "comprising" is a reference to "including", where both words are used in a context that is not limiting. The invention is most easily understood with reference to the accompanying figures. It will be understood that the figures are intended to be illustrative embodiments of the invention and that the scope of the invention as defined in the claims includes further embodiments not so illustrated. For example, the preferred embodiment of the invention has a trapezoidal shape. The scope of the invention includes embodiments with conical shapes and other suitable shapes.
Figure 1 shows in side perspective view a filter 2 and receptacle 1 which comprise a filter apparatus for a gas-delivery system. A first end 3 of the filter 2 has a first width or cross sectional area, which tapers along an outer surface 7 to a second insertion end 4 having a second width of the filter 2. It can be seen in Figure 1 that the outer surfaces of the insertion end and the side walls form a generally obtuse angle and the inner surfaces of the corresponding walls of the receptacle 1 form a corresponding angle while the surface of the distal end of the filter and the side surfaces form a generally acute angle. The receptacle 1 has a corresponding width at a first end 5 which tapers along a side surface 8 to a second corresponding width 6. The taper of the side walls may be stepped as well as smooth, as long as the insertion end of the filter is smaller in width or cross sectional area than the distal end 3. Figure 1 shows that both sides 7, 9 of the filter 2 taper from the first end to the second end. The scope of the invention includes that a single side of the filter to be tapered from the first end to the second end. Alternatively, the filter may be generally cone-shaped. The taper results from the insertion end 4 forming an acute angle with the side 7. Preferably, both sides 7 of the filter taper to the insertion end 4. The receptacle 1 has a corresponding taper to the filter 2 from a first end to a second end. This enables the filter to be easily inserted into the receptacle as indicated in the direction of the arrow for a snug fit. As shown in Figure 2, in operation the pathway of air flow, indicated by the arrow 13, is substantially perpendicular to the end of the filter 2 through the opening of the receptacle and through the material of the filter 2.
Preferably the filter is an essentially trapezoidal shape when viewed from an end of the filter and receptacle provide a simple but effective means to filter air but which is simple and easy to remove for cleaning and replacement. Alternatively, the invention includes embodiments where there sides of the shape are stepped in width, reducing from one end to the insertion end.
The most effective filtration is achieved if the clearance 14, shown in Figure 3, between the outside surface of the filter 2 and the inside surface of the receptacle 1 is minimised. Preferably the outside surfaces of the filter 2 are essentially smooth planes. This arrangement helps to minimise any channelling or air flow around the edges of the filter in passing through the receptacle. Any channelling reduces the effectiveness of the filtration. Preferably, there is interference between the engagement surfaces 9 of the filter 2 with the inside surfaces 15 of the receptacle 1 when the filter is in position for operation as shown in Figure 4. Such interference minimises any channelling of the air so that the air flows through the filter and particulate matter is filtered.
The taper of the filter most advantageously requires little insertion force in engaging the filter with its receptacle. The maximum force required to position the filter occurs as the filter engages the inside faces 15 of the receptacle.

Claims

Claims
1. A filter system for a gas stream, comprising: a filtering means having a first end and a second end; said first end forming a substantially obtuse angle with a side of the filtering means and said second end forming a substantially acute angle with said side of said filtering means; and a receptacle having a complementary shape for engaging the filtering means.
2. The filter system of claim 1 wherein at least a portion of a side of the filter means tapers substantially smoothly from said first substantially obtuse angle to a spaced portion of said side of said filter means.
3. The filter system of claims 1 or claim 2 wherein the filter means tapers from said first end to the second end.
4. A filter system for a gas stream, comprising: a filtering means having a trapezoidal shape; and a receptacle having a complementary shape for engaging the filter.
5. The filter system of claims 1 to 4 wherein the filter system is located in the air stream of a gas-delivery device for delivering gas to the nose of a subject.
6. A filter system for a gas stream, comprising: a filtering means having a first end smaller in cross section than a second end; and a receptacle having a complementary shape for engaging the filter.
7. The filter system of claim 5 wherein at least a portion of a side of the filter means tapers substantially smoothly from said first substantially obtuse angle to a spaced portion of said side of said filter means.
8. The filter system of claims 5 or 6 wherein a wall of said filter means tapers from said first end to said second end.
9. The filter system of claims 5 to 8 wherein the filter system is located in the air stream of a gas-delivery device for delivering gas to the nose of a subject.
10. A filter system for a gas stream substantially as herein described with reference to the figures.
11. A method of filtering the gas in a gas-delivery device for delivering gas to the nose of a subject, comprising the steps of; engaging a filtering means having a generally trapezoidal shape into a receptacle of complementary shape; and placing the resulting filtering system in the path of the gas stream of said gas- delivery device.
PCT/AU2008/000793 2007-06-08 2008-06-05 Cpap filter WO2008148151A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2007903098A AU2007903098A0 (en) 2007-06-08 Air Filter
AU2007903098 2007-06-08

Publications (1)

Publication Number Publication Date
WO2008148151A1 true WO2008148151A1 (en) 2008-12-11

Family

ID=40093070

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2008/000793 WO2008148151A1 (en) 2007-06-08 2008-06-05 Cpap filter

Country Status (1)

Country Link
WO (1) WO2008148151A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108245758A (en) * 2017-12-28 2018-07-06 广州德瑞康医疗器械有限公司 A kind of disposable breathing circuit filter being easily installed
CN108907106A (en) * 2018-09-30 2018-11-30 广东肇庆动力金属股份有限公司 A kind of cylinder cap running gate system
WO2021013388A1 (en) * 2019-07-19 2021-01-28 Hamilton Medical Ag Breathing tube with a more easily interchangeable breathing-gas filter

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1282879A1 (en) * 1985-09-12 1987-01-15 Специальное Конструкторское Бюро По Подземному Самоходному Горному Оборудованию High-rate bag filter
US5505197A (en) * 1992-12-11 1996-04-09 Modex/Metric Products, Inc. Respirator mask with tapered filter mount and valve aligning pins and ears
US6447587B1 (en) * 2000-05-03 2002-09-10 Hamilton Beach/Proctor-Silex, Inc. Air filtration device
US20030022617A1 (en) * 2001-07-27 2003-01-30 Gebke Kevin J. Conical air filter
WO2004067094A1 (en) * 2003-01-30 2004-08-12 Msa Auer Gmbh Respiration filter and method for producing the same
US20060096597A1 (en) * 2004-11-09 2006-05-11 Home Health Medical Equipment Incorporated, D/B/A Ag Industries Swivel filter for use with sleep apnea and other respiratory equipment including associated interface systems
WO2007045017A2 (en) * 2005-10-21 2007-04-26 Compumedics Limited Apparatus for delivery of pressurised gas

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1282879A1 (en) * 1985-09-12 1987-01-15 Специальное Конструкторское Бюро По Подземному Самоходному Горному Оборудованию High-rate bag filter
US5505197A (en) * 1992-12-11 1996-04-09 Modex/Metric Products, Inc. Respirator mask with tapered filter mount and valve aligning pins and ears
US6447587B1 (en) * 2000-05-03 2002-09-10 Hamilton Beach/Proctor-Silex, Inc. Air filtration device
US20030022617A1 (en) * 2001-07-27 2003-01-30 Gebke Kevin J. Conical air filter
WO2004067094A1 (en) * 2003-01-30 2004-08-12 Msa Auer Gmbh Respiration filter and method for producing the same
US20060096597A1 (en) * 2004-11-09 2006-05-11 Home Health Medical Equipment Incorporated, D/B/A Ag Industries Swivel filter for use with sleep apnea and other respiratory equipment including associated interface systems
WO2007045017A2 (en) * 2005-10-21 2007-04-26 Compumedics Limited Apparatus for delivery of pressurised gas

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108245758A (en) * 2017-12-28 2018-07-06 广州德瑞康医疗器械有限公司 A kind of disposable breathing circuit filter being easily installed
CN108907106A (en) * 2018-09-30 2018-11-30 广东肇庆动力金属股份有限公司 A kind of cylinder cap running gate system
WO2021013388A1 (en) * 2019-07-19 2021-01-28 Hamilton Medical Ag Breathing tube with a more easily interchangeable breathing-gas filter

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