WO1998034665A1 - A mask and a vent assembly therefor - Google Patents

A mask and a vent assembly therefor Download PDF

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Publication number
WO1998034665A1
WO1998034665A1 PCT/AU1998/000067 AU9800067W WO9834665A1 WO 1998034665 A1 WO1998034665 A1 WO 1998034665A1 AU 9800067 W AU9800067 W AU 9800067W WO 9834665 A1 WO9834665 A1 WO 9834665A1
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WO
WIPO (PCT)
Prior art keywords
mask
insert
vent assembly
conduit
shell
Prior art date
Application number
PCT/AU1998/000067
Other languages
French (fr)
Inventor
Philip Rodney Kwok
Original Assignee
Resmed 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 Resmed Limited filed Critical Resmed Limited
Priority to AU58476/98A priority Critical patent/AU5847698A/en
Priority to EP98901876A priority patent/EP0968022B1/en
Priority to JP53342098A priority patent/JP3687981B2/en
Priority to DE69839041T priority patent/DE69839041T2/en
Publication of WO1998034665A1 publication Critical patent/WO1998034665A1/en

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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
    • A61M16/06—Respiratory or anaesthetic masks
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
    • A62B18/02—Masks
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
    • A62B18/08—Component parts for gas-masks or gas-helmets, e.g. windows, straps, speech transmitters, signal-devices
    • A62B18/10—Valves
    • 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
    • A61M16/06—Respiratory or anaesthetic masks
    • A61M16/0683—Holding devices therefor
    • 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
    • A61M2202/00—Special media to be introduced, removed or treated
    • A61M2202/02—Gases
    • A61M2202/0225—Carbon oxides, e.g. Carbon dioxide
    • 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
    • A61M2205/02—General characteristics of the apparatus characterised by a particular materials
    • A61M2205/0216—Materials providing elastic properties, e.g. for facilitating deformation and avoid breaking
    • 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
    • A61M2205/42—Reducing noise

Definitions

  • the present invention relates to a mask and a vent assembly therefor.
  • the mask and vent assembly according to the invention have been developed primarily for the venting of washout gas in the application of continuous positive airway pressure (CPAP) treatment in conjunction with a system for supplying breathable gas pressurised above atmospheric pressure to a human or animal.
  • CPAP continuous positive airway pressure
  • Such a system is used, for example, in the treatment of obstructive sleep apnea (OS A) and similar sleep disordered breathing conditions.
  • OS A obstructive sleep apnea
  • the invention is also suitable for other purposes including, for example, the application of assisted ventilation or respiration.
  • mask is herein intended to include face masks, nose masks, mouth masks, nasal pillows, appendages in the vicinity of any of these devices and the like.
  • Treatment of OSA by CPAP flow generator systems involves the continuous delivery of air (or other breathable gas) pressurised above atmospheric pressure to a patient's airways via a conduit and a mask.
  • air or other breathable gas
  • the pressure of the gas delivered to a patient can be at a constant level, bi-level (ie. in synchronism with patient inspiration and expiration) or autosetting in level to match therapeutic need.
  • CPAP is intended to incorporate a reference to any one of, or combinations of, these forms of pressure delivery.
  • the masks used in CPAP treatment generally include a vent for washout of the gas to atmosphere.
  • the vent is normally located in the mask or in the gas delivery conduit adjacent the mask.
  • the washout of gas through the vent is essential for removal of exhaled gases from the breathing circuit to prevent carbon dioxide "re- breathing" or build-up, both of which represent a health risk to the mask wearer.
  • Adequate gas washout is achieved by selecting a vent size and configuration that will allow a minimum safe gas flow at the lowest operating CPAP pressure, which, typically can be as low as around 4 cm H2O for adults and 2 cm H2O in paediatric applications.
  • Prior art masks are generally comprised of a rigid plastic shell which covers the wearer's nose and/or mouth.
  • a flexible or resilient rim (or cushion) is attached to the periphery of the shell which abuts and seals against the wearer's face to provide a gas-tight seal around the nose and/or mouth.
  • a prior art washout vent utilized one or more holes or slits in the rigid shell or in a rigid portion of the delivery conduit to allow the washout gas to vent to atmosphere.
  • the holes or slits were formed during the moulding process. In others, they were drilled or cut as a separate step after the shell or conduit had been moulded.
  • Another prior art vent included hollow rivets or plugs manufactured from stainless steel or other rigid materials attached to openings in the rigid shell.
  • the outer edges of the rivets were rounded to help reduce noise.
  • this approach was expensive, required an extra production step and did not prove effective in reducing noise.
  • Foam filters wrapped around the air outlets in the shell were also attempted. However, they also suffered from the disadvantages of being prone to blocking, difficult to clean and requiring constant replacement.
  • Remote outlet tubes have been used to distance the noise source from the patient.
  • these tubes are difficult to clean, are prone to entanglement by the patient and/or their bed partner and suffer the further disadvantage that a volume of exhausted gas is retained in the tube adjacent the mask. It is an object of the present invention to substantially overcome or at least ameliorate the prior art disadvantages and, in particular, to reduce the noise generated by gas washout through a mask.
  • the invention in a first aspect, discloses a mask for use with a system for supplying breathable gas pressurised above atmospheric pressure to a human or animal's airways, the mask includes a mask shell which is, in use, in fluid communication with a gas supply conduit, a gas washout vent assembly, wherein at least the region of the mask shell or conduit surrounding or adjacent the vent assembly is formed from a relatively flexible elastomeric material.
  • the entire mask is formed from the elastomeric material.
  • the mask shell and/or conduit is formed from a relatively rigid material and the region surrounding or adjacent the vent assembly is formed from the relatively flexible elastomeric material.
  • the invention discloses a vent assembly for the washout of gas from a mask or conduit used with a system for supplying breathable gas pressurized above atmospheric pressure to a human or animal, wherein the vent assembly is formed from the relatively flexible elastomeric material.
  • the vent assembly is an insert of relatively flexible elastomeric material, wherein the insert is attachable to the mask shell or conduit.
  • the insert preferably has at least one orifice therethrough.
  • the rigid plastics mask shell is formed from polycarbonate and the insert is formed from SilasticTM or SantopreneTM.
  • the insert is substantially crescent-shaped and includes a plurality of orifices therethrough.
  • the insert preferably includes a groove around its periphery, the groove adapted to locate the insert against a correspondingly sized rim of an opening formed in the mask shell or conduit.
  • the insert is substantially circular, triangular, cross or peanut shaped.
  • the mask shell and/or the conduit can desirably also include one or more inserts.
  • Fig. 1 is a perspective view of a first embodiment
  • Fig. 2 is a perspective view of a second embodiment
  • Fig. 3 is a perspective view of a third embodiment
  • Fig. 4 is a perspective view of a fourth embodiment
  • Fig. 5 is a perspective view of a fifth embodiment
  • Fig. 6 is a perspective view of a sixth embodiment
  • Fig. 7 is a perspective view of a seventh embodiment
  • Fig. 8 is a partial cross-sectional view of the first embodiment along the line 8- 8 of Fig. 1 ;
  • Fig. 9 is a perspective view of an eighth embodiment
  • Fig. 10 is a plan view of the insert of the third embodiment
  • Fig. 11 is a cross-sectional view of the third embodiment insert along the line 11-11 of Fig. 10;
  • Fig. 12 is a partial cross-sectional view of the third embodiment insert along the line 12-12 of Fig. 10.
  • a mask 10 for use with a system (not shown) for supplying- breathable gas pressurised above atmospheric pressure to a human or animal's airways.
  • the mask includes a rigid plastics shell 12 having an inlet tube 14 for connection to a supply conduit to communicate breathable gas from a flow generator (not shown) to the nasal passages of the mask wearer.
  • the mask shell 12 also includes a flexible sealing membrane 16 which is used to provide a gas tight seal between the face of the wearer and the interior of the shell 12.
  • the shell 12 also includes lugs 18 for connecting the mask 10 to a head strap (not shown) to retain the mask in place.
  • the mask includes a SilasticTM insert 20 through which is provided an orifice 22 for gas washout.
  • the insert 20 has a recess or groove 24 around its periphery.
  • a correspondingly sized opening 26 bounded by a rim 28 is provided in the shell 12 to enable the insert 20 to be retained in place in the fashion of a grommet.
  • the opening 26 can be moulded in the shell 12 or drilled or punched as a post-moulding step.
  • the flexibility of the SilasticTM allows the insert 20 to be initially squeezed through the opening 26 before resiliently expanding to the configuration shown in Fig. 8 and engaging the rim 28.
  • Figs. 2 to 7 show further embodiments in which corresponding reference numerals are used to indicate like features.
  • the insert 20 has an external groove or recess 24 which engages the rim 28 of a corresponding shaped opening 26 in the mask shell 12 to retain the insert 20 in place.
  • the insert 20 includes more than one orifice 22.
  • two inserts 20 are provided in the shell 12.
  • the insert 20 is provided in a gas supply conduit 30.
  • Figs. 10 to 12 show the insert 20 of the third embodiment of Fig. 3.
  • the dimensions 32, 34, 36, 38, 40, 42 and 44 are approximately diameter 1.73 mm, diameter 3.30 mm, 28.80 mm, 19.00 mm, 1.20 mm, 1.20 mm and 3.60 mm respectively.
  • the side 44 of the insert 20 faces the patient's face in use and the side 46 faces atmosphere.
  • the mask shell 12 is manufactured from polycarbonate. Other rigid plastics materials can equally be used.
  • the insert 20 can be manufactured from an elastomer sold as SilasticTM (produced by the Dow Corning Corporation) or a thermoplastic elastomer sold as SantopreneTM (produced by Monsanto). Other flexible elastomeric materials can be used also.
  • the mask 10 produces less noise than an identical mask having a similar sized and shaped orifice(s) formed directly in the mask shell 12 instead of formed in the flexible insert 20. It is thought that the noise reduction occurs due to the flexible insert
  • the mask shown in Figure 3 produced less radiated noise than a similar mask not including the flexible elastomeric insert 20 representing a significant advantage in terms of the comfort of the mask wearer and their bed partner.
  • the masks 10 possesses other advantages over those of the prior art. Firstly, the insert 20 is very easy to install into the mask shell 12 during either assembly of the mask which, is often supplied in kit form, or before and after cleaning which is regularly required and often carried out in the home environment. Secondly, the mask shell 12 may be produced with a single size of opening 26 and provided with a range of different inserts 20 which allows the outlet size to be "tuned” to give an optimum gas washout rate for a particular patient's treatment pressure level.

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  • Health & Medical Sciences (AREA)
  • Pulmonology (AREA)
  • General Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Emergency Management (AREA)
  • Business, Economics & Management (AREA)
  • Anesthesiology (AREA)
  • Hematology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • Biomedical Technology (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Zoology (AREA)
  • Engineering & Computer Science (AREA)
  • Emergency Medicine (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)

Abstract

A mask (10) for use with a system for supplying breathable gsa pressurised above atmospheric pressure to a human or animal's airways. The mask (10) includes a mask shell (12) which is, in use, in fluid communication with a gas supply conduit (30), and a gas washout vent assembly (20). At least the region of the mask shell (12) or conduit (30) surrounding or adjacent the vent assembly is formed from a relatively flexible elastomeric material.

Description

A MASK AND A VENT ASSEMBLY THEREFOR
FIELD OF THE INVENTION
The present invention relates to a mask and a vent assembly therefor. The mask and vent assembly according to the invention have been developed primarily for the venting of washout gas in the application of continuous positive airway pressure (CPAP) treatment in conjunction with a system for supplying breathable gas pressurised above atmospheric pressure to a human or animal. Such a system is used, for example, in the treatment of obstructive sleep apnea (OS A) and similar sleep disordered breathing conditions. However, the invention is also suitable for other purposes including, for example, the application of assisted ventilation or respiration.
The term "mask" is herein intended to include face masks, nose masks, mouth masks, nasal pillows, appendages in the vicinity of any of these devices and the like.
BACKGROUND OF THE INVENTION
Treatment of OSA by CPAP flow generator systems involves the continuous delivery of air (or other breathable gas) pressurised above atmospheric pressure to a patient's airways via a conduit and a mask. For either the treatment of OSA or the application of assisted ventilation, the pressure of the gas delivered to a patient can be at a constant level, bi-level (ie. in synchronism with patient inspiration and expiration) or autosetting in level to match therapeutic need. Throughout this specification the reference to CPAP is intended to incorporate a reference to any one of, or combinations of, these forms of pressure delivery.
The masks used in CPAP treatment generally include a vent for washout of the gas to atmosphere. The vent is normally located in the mask or in the gas delivery conduit adjacent the mask. The washout of gas through the vent is essential for removal of exhaled gases from the breathing circuit to prevent carbon dioxide "re- breathing" or build-up, both of which represent a health risk to the mask wearer. Adequate gas washout is achieved by selecting a vent size and configuration that will allow a minimum safe gas flow at the lowest operating CPAP pressure, which, typically can be as low as around 4 cm H2O for adults and 2 cm H2O in paediatric applications. Prior art masks are generally comprised of a rigid plastic shell which covers the wearer's nose and/or mouth. A flexible or resilient rim (or cushion) is attached to the periphery of the shell which abuts and seals against the wearer's face to provide a gas-tight seal around the nose and/or mouth.
A prior art washout vent utilized one or more holes or slits in the rigid shell or in a rigid portion of the delivery conduit to allow the washout gas to vent to atmosphere. In some masks, the holes or slits were formed during the moulding process. In others, they were drilled or cut as a separate step after the shell or conduit had been moulded.
The flow of gas out the holes or slits in the shell or conduit to atmosphere creates noise and turbulence at the hole or slit outlet as the delivered gas, and upon expiration, the patient-expired gas (including CO2) exits. Bi-level and autosetting gas delivery regimes tend to generate more noise than a constant level gas delivery regime. This is thought to be due to the extra turbulence created by the gas accelerating and decelerating as it cycles between relatively low and relatively high pressures. The noise adversely affects patient and bed-partner comfort.
Another prior art vent included hollow rivets or plugs manufactured from stainless steel or other rigid materials attached to openings in the rigid shell. The outer edges of the rivets were rounded to help reduce noise. However, this approach was expensive, required an extra production step and did not prove effective in reducing noise.
Another approach to reduce noise involved the use of sintered filters at the gas outlet of the mask shell. However, the filters were prone to blocking, especially in the presence of moisture. Accordingly, sintered filters were impractical for use in CPAP treatment as they were easily blocked by the moisture from the patient's respiratory system or humidifiers or during the necessary regular cleaning of the mask and associated componentry.
Foam filters wrapped around the air outlets in the shell were also attempted. However, they also suffered from the disadvantages of being prone to blocking, difficult to clean and requiring constant replacement.
Remote outlet tubes have been used to distance the noise source from the patient. However, these tubes are difficult to clean, are prone to entanglement by the patient and/or their bed partner and suffer the further disadvantage that a volume of exhausted gas is retained in the tube adjacent the mask. It is an object of the present invention to substantially overcome or at least ameliorate the prior art disadvantages and, in particular, to reduce the noise generated by gas washout through a mask.
SUMMARY OF THE INVENTION Accordingly, the invention, in a first aspect, discloses a mask for use with a system for supplying breathable gas pressurised above atmospheric pressure to a human or animal's airways, the mask includes a mask shell which is, in use, in fluid communication with a gas supply conduit, a gas washout vent assembly, wherein at least the region of the mask shell or conduit surrounding or adjacent the vent assembly is formed from a relatively flexible elastomeric material.
In an embodiment, the entire mask is formed from the elastomeric material. In another embodiment, the mask shell and/or conduit is formed from a relatively rigid material and the region surrounding or adjacent the vent assembly is formed from the relatively flexible elastomeric material. In a second aspect, the invention discloses a vent assembly for the washout of gas from a mask or conduit used with a system for supplying breathable gas pressurized above atmospheric pressure to a human or animal, wherein the vent assembly is formed from the relatively flexible elastomeric material. In a preferred embodiment, the vent assembly is an insert of relatively flexible elastomeric material, wherein the insert is attachable to the mask shell or conduit. The insert preferably has at least one orifice therethrough.
In a preferred form, the rigid plastics mask shell is formed from polycarbonate and the insert is formed from Silastic™ or Santoprene™.
Desirably, the insert is substantially crescent-shaped and includes a plurality of orifices therethrough.
The insert preferably includes a groove around its periphery, the groove adapted to locate the insert against a correspondingly sized rim of an opening formed in the mask shell or conduit.
In other embodiments, the insert is substantially circular, triangular, cross or peanut shaped.
The mask shell and/or the conduit can desirably also include one or more inserts.
BRIEF DESCRIPTION OF THE DRAWINGS
Preferred embodiments of the invention will now be described, by way of examples only, with reference to the accompanying drawings in which:
Fig. 1 is a perspective view of a first embodiment; Fig. 2 is a perspective view of a second embodiment;
Fig. 3 is a perspective view of a third embodiment;
Fig. 4 is a perspective view of a fourth embodiment;
Fig. 5 is a perspective view of a fifth embodiment;
Fig. 6 is a perspective view of a sixth embodiment; Fig. 7 is a perspective view of a seventh embodiment;
Fig. 8 is a partial cross-sectional view of the first embodiment along the line 8- 8 of Fig. 1 ;
Fig. 9 is a perspective view of an eighth embodiment;
Fig. 10 is a plan view of the insert of the third embodiment; Fig. 11 is a cross-sectional view of the third embodiment insert along the line 11-11 of Fig. 10; and
Fig. 12 is a partial cross-sectional view of the third embodiment insert along the line 12-12 of Fig. 10.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring firstly to Fig. 1, there is shown a mask 10 for use with a system (not shown) for supplying- breathable gas pressurised above atmospheric pressure to a human or animal's airways. The mask includes a rigid plastics shell 12 having an inlet tube 14 for connection to a supply conduit to communicate breathable gas from a flow generator (not shown) to the nasal passages of the mask wearer. The mask shell 12 also includes a flexible sealing membrane 16 which is used to provide a gas tight seal between the face of the wearer and the interior of the shell 12. The shell 12 also includes lugs 18 for connecting the mask 10 to a head strap (not shown) to retain the mask in place. The mask includes a Silastic™ insert 20 through which is provided an orifice 22 for gas washout. As best shown in Figure 8, the insert 20 has a recess or groove 24 around its periphery. A correspondingly sized opening 26 bounded by a rim 28 is provided in the shell 12 to enable the insert 20 to be retained in place in the fashion of a grommet. The opening 26 can be moulded in the shell 12 or drilled or punched as a post-moulding step. The flexibility of the Silastic™ allows the insert 20 to be initially squeezed through the opening 26 before resiliently expanding to the configuration shown in Fig. 8 and engaging the rim 28.
Figs. 2 to 7 show further embodiments in which corresponding reference numerals are used to indicate like features. In all these embodiments the insert 20 has an external groove or recess 24 which engages the rim 28 of a corresponding shaped opening 26 in the mask shell 12 to retain the insert 20 in place.
In the embodiment shown in Figs. 2 to 5 and 7 the insert 20 includes more than one orifice 22. In the embodiment shown in Fig. 6, two inserts 20 are provided in the shell 12. In the embodiment shown in Fig. 9, the insert 20 is provided in a gas supply conduit 30.
Figs. 10 to 12 show the insert 20 of the third embodiment of Fig. 3. The dimensions 32, 34, 36, 38, 40, 42 and 44 are approximately diameter 1.73 mm, diameter 3.30 mm, 28.80 mm, 19.00 mm, 1.20 mm, 1.20 mm and 3.60 mm respectively.
The side 44 of the insert 20 faces the patient's face in use and the side 46 faces atmosphere.
The mask shell 12 is manufactured from polycarbonate. Other rigid plastics materials can equally be used. The insert 20 can be manufactured from an elastomer sold as Silastic™ (produced by the Dow Corning Corporation) or a thermoplastic elastomer sold as Santoprene™ (produced by Monsanto). Other flexible elastomeric materials can be used also.
The mask 10 produces less noise than an identical mask having a similar sized and shaped orifice(s) formed directly in the mask shell 12 instead of formed in the flexible insert 20. It is thought that the noise reduction occurs due to the flexible insert
20 damping vibrations caused by air passage through the orifice(s) 22 which produce vibrations or similar in the mask shell 12.
A prototype of the embodiment of the invention shown in Figure 3 has been tested over a range of constant and bi-level CPAP treatment pressures. For comparison purposes, an identical mask to that shown in Fig. 3 but formed entirely from polycarbonate and having six identical arcuately spaced holes 22 drilled directly through the mask shell was also tested. In both masks the six holes had a diameter of 1.7 mm. The results of the test are summarised in the Tables below: TABLR 1
Constant level gas delivery
Figure imgf000009_0001
TABLE 2
Bi-level gas delivery
Figure imgf000009_0002
As the results show, the mask shown in Figure 3 produced less radiated noise than a similar mask not including the flexible elastomeric insert 20 representing a significant advantage in terms of the comfort of the mask wearer and their bed partner.
In addition to the noise reduction discussed above, the masks 10 possesses other advantages over those of the prior art. Firstly, the insert 20 is very easy to install into the mask shell 12 during either assembly of the mask which, is often supplied in kit form, or before and after cleaning which is regularly required and often carried out in the home environment. Secondly, the mask shell 12 may be produced with a single size of opening 26 and provided with a range of different inserts 20 which allows the outlet size to be "tuned" to give an optimum gas washout rate for a particular patient's treatment pressure level.
Although the invention has been described with reference to specific examples, it will be appreciated by those skilled in the art, that the invention may be embodied in many other forms.

Claims

1. A mask for use with a system for supplying breathable gas pressurised above atmospheric pressure to a human or animal's airways, the mask includes a mask shell which is, in use, in fluid communication with a gas supply conduit, and a gas washout vent assembly, wherein at least the region of the mask shell or conduit surrounding or adjacent the vent assembly is formed from a relatively flexible elastomeric material.
2. A mask as claimed in claim 1, wherein the entire mask is formed from the elastomeric material.
3. A mask as claimed in claim 1, wherein the mask shell and/or conduit is formed from a relatively rigid material and the region surrounding or adjacent the vent assembly is formed from the relatively flexible elastomeric material.
4. A mask as claimed in claim 1 or 3, wherein the vent assembly is an insert of relatively flexible elastomeric material and is attachable to the mask shell or conduit.
5. A mask as claimed in claim 1, 3 or 4, wherein the insert has at least one orifice therethrough.
6. A mask as claimed in any one of claims 1 or 3 to 5, wherein the rigid plastics mask shell is formed from polycarbonate and the insert is formed from SilasticΓäó or SantopreneΓäó.
7. A mask as claimed in any one of claims 1 or 3 to 6, wherein the insert is substantially crescent-shaped and includes a plurality of orifices therethrough.
8. A mask as claimed in any one of claims 1 or 3 to 7, wherein the insert includes a groove around its periphery, the groove adapted to locate the insert against a correspondingly sized rim of an opening formed in the mask shell or conduit.
9. A mask as claimed in any one of claims 1 or 3 to 8, wherein the insert is substantially circular, triangular, cross or peanut shaped.
10. A mask as claimed in any one of claims 4 to 9, wherein the mask shell or the conduit includes a plurality of said inserts. -lo¬
ll . A vent assembly for the washout of gas from a mask or conduit used with a system for supplying breathable gas pressurized above atmospheric pressure to a human or animal, wherein the vent assembly is formed from a relatively flexible elastomeric material.
12. A vent assembly as claimed in claim 11, wherein the vent assembly is an insert of relatively flexible elastomeric material and is attachable to the mask shell or conduit.
13. A vent assembly as claimed in claim 11 or 12, wherein the insert has at least one orifice therethrough.
14. A vent assembly as claimed in claim 11, 12 or 13, wherein the rigid plastics mask shell is formed from polycarbonate and the insert is formed from SilasticΓäó or SantopreneΓäó.
15. A vent assembly as claimed in any one of claims 11 to 14, wherein the insert is substantially crescent-shaped and includes a plurality of orifices therethrough.
16. A vent assembly as claimed in any one of claims 11 to 15, wherein the insert includes a groove around its periphery, the groove adapted to locate the insert against a correspondingly sized rim of an opening formed in the mask shell or conduit.
17. A vent assembly as claimed in any one of claims 11 to 16, wherein the insert is substantially circular, triangular, cross or peanut shaped.
PCT/AU1998/000067 1997-02-10 1998-02-06 A mask and a vent assembly therefor WO1998034665A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AU58476/98A AU5847698A (en) 1997-02-10 1998-02-06 A mask and a vent assembly therefor
EP98901876A EP0968022B1 (en) 1997-02-10 1998-02-06 A mask and a vent assembly therefor
JP53342098A JP3687981B2 (en) 1997-02-10 1998-02-06 Mask and vent assembly therefor
DE69839041T DE69839041T2 (en) 1997-02-10 1998-02-06 MASK AND VENTILATION DEVICE THEREFOR

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPO5045A AUPO504597A0 (en) 1997-02-10 1997-02-10 A mask and a vent assembly therefor
AUPO5045 1997-02-10

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WO1998034665A1 true WO1998034665A1 (en) 1998-08-13

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US (4) US6561190B1 (en)
EP (5) EP2298400B1 (en)
JP (5) JP3687981B2 (en)
AT (2) ATE524791T1 (en)
AU (3) AUPO504597A0 (en)
DE (1) DE69839041T2 (en)
ES (1) ES2543008T3 (en)
WO (1) WO1998034665A1 (en)

Cited By (189)

* Cited by examiner, † Cited by third party
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EP1025875A2 (en) 1999-02-04 2000-08-09 Teijin Limited Nasal resuscitator mask
WO2000078381A1 (en) * 1999-06-18 2000-12-28 Resmed Limited A connector for a respiratory mask and a respiratory mask
WO2001095965A1 (en) 2000-06-14 2001-12-20 Fisher & Paykel Healthcare Limited Breathing assistance apparatus
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US8122886B2 (en) 2012-02-28
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AU712236B2 (en) 1999-11-04
ATE384546T1 (en) 2008-02-15

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