WO1998004310A1 - A nasal mask and mask cushion therefor - Google Patents

A nasal mask and mask cushion therefor Download PDF

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Publication number
WO1998004310A1
WO1998004310A1 PCT/AU1997/000450 AU9700450W WO9804310A1 WO 1998004310 A1 WO1998004310 A1 WO 1998004310A1 AU 9700450 W AU9700450 W AU 9700450W WO 9804310 A1 WO9804310 A1 WO 9804310A1
Authority
WO
WIPO (PCT)
Prior art keywords
nose
rim
membrane
mask
cushion
Prior art date
Application number
PCT/AU1997/000450
Other languages
French (fr)
Inventor
Philip Rodney Kwok
Robert Edward Styles
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=3795580&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1998004310(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to AU34293/97A priority Critical patent/AU710733B2/en
Priority to EP97930255A priority patent/EP0956069B1/en
Priority to US09/230,491 priority patent/US6357441B1/en
Priority to DE69730866T priority patent/DE69730866T2/en
Priority to JP10508323A priority patent/JP2000515784A/en
Application filed by Resmed Limited filed Critical Resmed Limited
Priority to CA002261790A priority patent/CA2261790C/en
Publication of WO1998004310A1 publication Critical patent/WO1998004310A1/en
Priority to US10/067,772 priority patent/US6581602B2/en
Priority to US10/068,963 priority patent/US7178527B2/en
Priority to US11/648,537 priority patent/US8636006B2/en
Priority to US14/163,945 priority patent/US9421339B2/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. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0057—Pumps therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
    • A61B5/097—Devices for facilitating collection of breath or for directing breath into or through measuring devices
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6813—Specially adapted to be attached to a specific body part
    • A61B5/6814—Head
    • A61B5/6819—Nose
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6813—Specially adapted to be attached to a specific body part
    • A61B5/6814—Head
    • A61B5/682—Mouth, e.g., oral cavity; tongue; Lips; Teeth
    • 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
    • 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
    • A61M16/0605—Means for improving the adaptation of the mask to the patient
    • A61M16/0616—Means for improving the adaptation of the mask to the patient with face sealing means comprising a flap or membrane projecting inwards, such that sealing increases with increasing inhalation gas pressure
    • 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
    • A61M16/0605—Means for improving the adaptation of the mask to the patient
    • A61M16/0616—Means for improving the adaptation of the mask to the patient with face sealing means comprising a flap or membrane projecting inwards, such that sealing increases with increasing inhalation gas pressure
    • A61M16/0622—Means for improving the adaptation of the mask to the patient with face sealing means comprising a flap or membrane projecting inwards, such that sealing increases with increasing inhalation gas pressure having an underlying cushion
    • 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
    • A61M16/0605—Means for improving the adaptation of the mask to the patient
    • A61M16/0633—Means for improving the adaptation of the mask to the patient with forehead support
    • 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
    • A61M2210/00—Anatomical parts of the body
    • A61M2210/06—Head
    • A61M2210/0618—Nose

Definitions

  • the invention relates generally to a nasal mask and to a cushion therefor, for example, for use in the treatment of respiratory conditions and in assisted respiration.
  • Nasal masks are commonly used in the treatment of respiratory conditions and sleep disorders (e.g. , obstructive sleep apnea) by delivering a flow of breathable gas for, or to assist patient respiration.
  • These nasal masks typically receive a gas supply line which delivers gas into a chamber formed by walls of the mask.
  • the walls usually are semi-rigid and have a face contacting portion including an aperture which is aligned with the wearer's nostrils.
  • the face contacting portion can comprise a soft, resilient elastomeric material which may conform to various facial contours.
  • the mask normally is secured to the wearer's head by straps. The straps are adjusted to pull the mask against the face with sufficient force to achieve a gas tight seal between the mask and the wearer's face. Gas is thus delivered to the mask and through the aperture to the wearer's nasal passages.
  • the mask may be dislodged, thereby breaking the seal between the mask and wearer. This may occur if the wearer rolls over when sleeping thereby creating a drag force on the gas supply line which is transmitted to the mask, breaking the seal.
  • CPAP Continuous Positive Airway Pressure
  • the face contacting portion may apply excessive pressure to the wearer's face resulting in discomfort and possibly skin irritation. This excessive forces. In some cases these excessive pressures and forces may cause the face to distort to conform with the face contacting portion to increase wearer discomfort, facial soreness and ulceration.
  • a prior art nasal cushion 10 generally equivalent to that shown in prior art U.S. Patent No. 5,243,971 , is first described.
  • the cushion 10 generally includes a base 11 from which depends a semi-rigid cushion frame 12 formed of elastomeric material. Attached over the outside of the frame 12 is a membrane 15, also of elastomeric material, having at its distal end a face contacting portion 14. The frame 12 and the membrane 15 generally form a chamber 17 into which the wearer's nose can be received. The frame 12 has a notch 19 to accommodate the bridge of the wearer's nose.
  • the base 11 includes slots 13 to accommodate straps (not shown) to secure the cushion 10 and a mask body (not shown) in combination to the wearer's head.
  • An aperture 16 is formed at the end of the membrane 15 distal from the frame 12 providing access for a wearer's nose 20 to the chamber 17 as noted.
  • the aperture 16 in an unflexed state is generally circular (or elliptical) and is large enough to allow partial entry of the wearer's nose.
  • the resilience of the membrane material allows the face contacting portion 14 and the aperture 16 to invert when the nose is received.
  • the inverted membrane arrangement relies upon a positive pressure of supplied gas within the mask to effect a seal to the wearer's face.
  • the seal is characterised as a "rolling edge seal", in that there can be motion of the cushion 10 relative to the patient's face yet the seal is maintained. Even so, a tuck 22 arises in the vicinity of the upper lip due to the circular shape of the aperture, and it is from this tuck that leaks can arise due to head and body movement during sleep.
  • the invention discloses a nasal mask cushion to sealingly connect a mask to a wearer's face, the cushion comprising: a substantially triangularly-shaped frame of resilient material having a rim to surround the wearer's nose; a membrane also of resilient material, the membrane being relatively more flexible than the frame, and being of the same general shape as said rim and fixed to and extending away from the frame so as to have an outer surface spaced from the rim, a portion of said outer surface forming a face contacting seal; and a nose-receiving cavity bounded by said frame and said membrane; and wherein said seal portion is generally coterminous with respect to said rim and is resiliently deformable towards the rim in use of the cushion.
  • the rim and seal portion are shaped to generally match facial contours of the facial tissue around the sides and over the bridge of the nose and between the base of the nose and the top lip.
  • the membrane is substantially saddle- shaped.
  • the membrane further has a centrally located aperture through which the wearer's nose passes to enter said cavity.
  • the cushion and membrane each include a co-located notch to accommodate the bridge of the nose of the wearer.
  • the seal portion contacts at least the wearer's nose, and preferably, also the facial tissue around the sides and over the bridge of the nose and between the base of the nose and the top lip.
  • the invention further discloses a nasal mask for connection to a wearer's face comprising: a mask body for connection with a supply of breathable gas; and a nasal cushion, the body and cushion defining a nose-receiving cavity, the cushion including: a substantially triangularly-shaped frame of resilient material having a rim to surround the wearer's nose; a membrane also of resilient material, the membrane being relatively more flexible than the frame, and being of the same general shape as said rim and fixed to and extending away from the frame so as to have an outer surface spaced from the frame, a portion of said outer surface forming a face contacting seal; and wherein said seal portion is generally coterminous with respect to said rim and is resiliently deformable towards the rim in use of the mask.
  • the mask body can further include attachment points from which securing straps can be attached, and by which the mask can be secured to the wearer's head.
  • the nasal mask can yet further comprise an arm depending from said body from which a further securing strap(s) can be attached.
  • the invention further discloses nasal CPAP treatment apparatus comprising a flow generator for the supply of gas at a pressure elevated above atmospheric pressure to a gas delivery conduit, the conduit in turn coupled to a nasal mask as described immediately above.
  • a supply of gas can be provided to said cavity, said supply of gas assisting, but not solely causing maintenance of a seal by said seal forming portion of said membrane to the face of the wearer in use of the cushion.
  • the membrane and the rim are substantially shaped to the facial contour, and the membrane does not need to turn in on itself, as in the prior art, thus contacting the face without folds or creases.
  • the headstraps need only to be tensioned to balance the force due to mask gas pressure that tends to lift the mask off the face.
  • Such relatively lower mask- to-face pressure results in greater patient comfort, and a reduction in the likelihood of skin irritation.
  • Fig. 1 is an exploded perspective view of a prior art nasal mask
  • Fig. 2 is a perspective view of the prior art nasal mask of Fig. 1;
  • Fig. 3 is a perspective view of the prior art nasal mask attached to a wearer;
  • Fig. 4 is a rear perspective view of a mask cushion embodying the present invention.
  • Fig. 5 is a cross-sectional view along line 5-5;
  • Fig. 6 is a perspective view of a nasal mask including the cushion of Figs. 4 and 5;
  • Fig. 7 is a perspective view of the nasal mask of Fig. 6 secured to a wearer's head.
  • Fig. 4 shows a perspective view of a nasal cushion 30 embodying the invention.
  • Fig. 5 shows the cross-sectional view along line 5-5.
  • the cushion 30 comprises a substantially triangularly shaped frame 32 from which extends a membrane 34.
  • the frame 32 has a scalloped edge 36 by which the cushion 30 is affixed to a mask body, as presently will be described.
  • the membrane 34 has an aperture 38 into which the wearer's nose is received in use of the cushion 30.
  • the membrane 34 is spaced away from the rim 40 of the frame 32, and its outer surface 41 is of substantially the same shape as the rim 40.
  • the outer surface 41 of the membrane 34 and the rim 40 of the frame 32 also can be described as generally saddle shaped.
  • the shaping of the outer surface 41 of the membrane 34 and the rim 40 of the frame 32 also include respective notches 42,44 that receive the bridge of the wearer's nose in use of the cushion 30.
  • the frame 32 and the membrane 34 are integrally formed, typically by in a one-shot molding process.
  • the frame 32 and the membrane 34 are fabricated from a resilient material.
  • a resilient material is Silastic TM silicone elastomer manufactured by Dow Corning.
  • the frame 32 in one preferred embodiment, has a typical thickness at its rim 40 of 1.5 mm.
  • the membrane 34 in a preferred embodiment, has a typical thickness of 0.35 mm. In this way, the membrane 34 is relatively more flexible than the rim 40.
  • a wearer's nose will be inserted in the aperture 38 to engage a seal forming portion 45 (formed between the dashed lines) of the outer surface 41 to cause deformation of the membrane 34.
  • a seal forming portion 45 formed between the dashed lines
  • the frame 32 has a rigidity sufficient to withstand usual securing pressures in use of the cushion 30 to tend to retain its shape and resist deformation. It thus acts as a supporting structure.
  • the nasal cushion 30 is shown attached to a mask body 46 by the edge 36 of the frame 32, adhered or otherwise secured to a flange 48 of the mask body 46. Only the outer surface 41 of the membrane 34 can be seen.
  • the flange 48 includes three slots 50-54 from which tensioning straps can be attached to secure the cushion 30 and the mask body 46 (in combination) to the head of a wearer.
  • the mask body 46 forms a cavity that can receive the nose of the wearer by the aperture 38.
  • a port 56 is provided at the top of the mask body 46 by which breathable gas can be supplied to the chamber.
  • a nasal mask 60 including the mask body 46 and the mask cushion 30.
  • a coupling tube 62 is connected at one end with the inlet port 56, and at the other to a socket 64 into which can be received a gas delivery tube (not shown) for the supply of breathable gas to the chamber internal of the mask body 46.
  • the mask body 46 also has two vent openings 66 by which expired gas is exhausted.
  • a first fastening strap 68 is fixed between to the lower two slots 50,54.
  • the upper slot 52 receives an arm 70, the top end of which has a resilient pad 72 to engage the forehead of the wearer.
  • the arm 70 has two slots 74,76 along its side edges, by which a second fastening strap 78 is secured.
  • the wearer's nose is received through the aperture 38 into the chamber within the mask body 46.
  • the seal forming portion 45 thus contacts both the surface of the wearer's nose and a portion of the wearer's face in the region between the base of the nose and the upper lip, and around the sides and over the bridge of the nose.
  • the shape of the seal forming portion 45 is particularly suited to effectively seal the difficult region of the facial contour that is the crease between the sides of the nose and the face.
  • a seal is formed with the membrane 34 remaining spaced from the rim 40 of the cushion frame 32.
  • the membrane 34 closely imitates the facial contour, and because of its relatively lesser stiffness than the frame 32, can conform to particular facial structures with minimum force, and without a tendency to fold or crease.
  • nasal cushion 30 and nasal mask 60 has been described with reference to CPAP or assisted respiration treatment, however it is to be understood that the invention generally is applicable to any application where gas and/or atomised liquid is to be supplied to the entrance of the nasal airways.
  • Such applications include nebulisers, gas masks and anaesthetic machines.

Abstract

A nasal cushion (30) comprises a substantially triangularly shaped frame (32) from which extends a membrane (34). The frame (32) has a scalloped edge (36) by which the cushion (30) is affixed to a mask body. The membrane (34) has an aperture (38) into which the wearer's nose is received. The membrane (34) is spaced away from the rim (40) of the frame (32), and its outer surface (41) is of substantially the same shape as the rim (40). Respective notches (42, 44) receive the bridge of the wearer's nose. The wearer's nose is received through the aperture (38) into the chamber within the mask body (46). The seal forming portion (45) thus contacts both the surface of the wearer's nose and a portion of the wearer's face in the region between the base of the nose and the upper lip, and around the sides and over the bridge of the nose. The shape of the seal forming portion (45) is particularly suited to effectively seal the difficult region of the facial contour that is the crease between the sides of the nose and the face.

Description

A NASAL MASK AND MASK CUSHION THEREFOR
Field of the Invention
The invention relates generally to a nasal mask and to a cushion therefor, for example, for use in the treatment of respiratory conditions and in assisted respiration.
Background of the Invention
Nasal masks are commonly used in the treatment of respiratory conditions and sleep disorders (e.g. , obstructive sleep apnea) by delivering a flow of breathable gas for, or to assist patient respiration. These nasal masks typically receive a gas supply line which delivers gas into a chamber formed by walls of the mask. The walls usually are semi-rigid and have a face contacting portion including an aperture which is aligned with the wearer's nostrils. The face contacting portion can comprise a soft, resilient elastomeric material which may conform to various facial contours. The mask normally is secured to the wearer's head by straps. The straps are adjusted to pull the mask against the face with sufficient force to achieve a gas tight seal between the mask and the wearer's face. Gas is thus delivered to the mask and through the aperture to the wearer's nasal passages.
Problems often arise with masks of the above configuration. For example, the mask may be dislodged, thereby breaking the seal between the mask and wearer. This may occur if the wearer rolls over when sleeping thereby creating a drag force on the gas supply line which is transmitted to the mask, breaking the seal. In the case of a mask being used for the administration of Continuous Positive Airway Pressure (CPAP) treatment for the condition obstructive sleep apnea, such a leak can result in the pressure supplied to the entrance of the wearer's airway being below the therapeutic value, and the treatment becoming ineffective.
Another problem is that the face contacting portion may apply excessive pressure to the wearer's face resulting in discomfort and possibly skin irritation. This excessive forces. In some cases these excessive pressures and forces may cause the face to distort to conform with the face contacting portion to increase wearer discomfort, facial soreness and ulceration.
Other types of devices exist whereby small nostril nosepieces (pillows) are held in place by a harness strapped over the wearer's head, for example as shown in prior art U.S. Patent No. 4,782,832. While this arrangement may alleviate some problems regarding seal breakage and skin abrasion, the harnesses associated with such devices are quite cumbersome for the wearer, as are the gas supply lines. Also, air 'jetting' into the nostrils can be irritating to the patient making such devices generally uncomfortable to use.
In Figs. 1-3, a prior art nasal cushion 10, generally equivalent to that shown in prior art U.S. Patent No. 5,243,971 , is first described.
As shown, the cushion 10 generally includes a base 11 from which depends a semi-rigid cushion frame 12 formed of elastomeric material. Attached over the outside of the frame 12 is a membrane 15, also of elastomeric material, having at its distal end a face contacting portion 14. The frame 12 and the membrane 15 generally form a chamber 17 into which the wearer's nose can be received. The frame 12 has a notch 19 to accommodate the bridge of the wearer's nose. The base 11 includes slots 13 to accommodate straps (not shown) to secure the cushion 10 and a mask body (not shown) in combination to the wearer's head.
An aperture 16 is formed at the end of the membrane 15 distal from the frame 12 providing access for a wearer's nose 20 to the chamber 17 as noted. As shown, the aperture 16 in an unflexed state is generally circular (or elliptical) and is large enough to allow partial entry of the wearer's nose. The resilience of the membrane material allows the face contacting portion 14 and the aperture 16 to invert when the nose is received. The inverted membrane arrangement relies upon a positive pressure of supplied gas within the mask to effect a seal to the wearer's face. The seal is characterised as a "rolling edge seal", in that there can be motion of the cushion 10 relative to the patient's face yet the seal is maintained. Even so, a tuck 22 arises in the vicinity of the upper lip due to the circular shape of the aperture, and it is from this tuck that leaks can arise due to head and body movement during sleep.
It is an object of the invention to overcome or at least substantially ameliorate one or more of the foregoing disadvantages.
Summary of the Invention
In one broad form, the invention discloses a nasal mask cushion to sealingly connect a mask to a wearer's face, the cushion comprising: a substantially triangularly-shaped frame of resilient material having a rim to surround the wearer's nose; a membrane also of resilient material, the membrane being relatively more flexible than the frame, and being of the same general shape as said rim and fixed to and extending away from the frame so as to have an outer surface spaced from the rim, a portion of said outer surface forming a face contacting seal; and a nose-receiving cavity bounded by said frame and said membrane; and wherein said seal portion is generally coterminous with respect to said rim and is resiliently deformable towards the rim in use of the cushion.
Preferably, the rim and seal portion are shaped to generally match facial contours of the facial tissue around the sides and over the bridge of the nose and between the base of the nose and the top lip.
In one particularly advantageous form, the membrane is substantially saddle- shaped. The membrane further has a centrally located aperture through which the wearer's nose passes to enter said cavity. It is preferred that the cushion and membrane each include a co-located notch to accommodate the bridge of the nose of the wearer. Typically, the seal portion contacts at least the wearer's nose, and preferably, also the facial tissue around the sides and over the bridge of the nose and between the base of the nose and the top lip. The invention further discloses a nasal mask for connection to a wearer's face comprising: a mask body for connection with a supply of breathable gas; and a nasal cushion, the body and cushion defining a nose-receiving cavity, the cushion including: a substantially triangularly-shaped frame of resilient material having a rim to surround the wearer's nose; a membrane also of resilient material, the membrane being relatively more flexible than the frame, and being of the same general shape as said rim and fixed to and extending away from the frame so as to have an outer surface spaced from the frame, a portion of said outer surface forming a face contacting seal; and wherein said seal portion is generally coterminous with respect to said rim and is resiliently deformable towards the rim in use of the mask.
The mask body can further include attachment points from which securing straps can be attached, and by which the mask can be secured to the wearer's head.
The nasal mask can yet further comprise an arm depending from said body from which a further securing strap(s) can be attached.
The invention further discloses nasal CPAP treatment apparatus comprising a flow generator for the supply of gas at a pressure elevated above atmospheric pressure to a gas delivery conduit, the conduit in turn coupled to a nasal mask as described immediately above.
In one particularly preferred form, a supply of gas can be provided to said cavity, said supply of gas assisting, but not solely causing maintenance of a seal by said seal forming portion of said membrane to the face of the wearer in use of the cushion. Advantageously, because the membrane and the rim are substantially shaped to the facial contour, and the membrane does not need to turn in on itself, as in the prior art, thus contacting the face without folds or creases. With the cushion/mask secured to the wearer's head, the headstraps need only to be tensioned to balance the force due to mask gas pressure that tends to lift the mask off the face. Such relatively lower mask- to-face pressure results in greater patient comfort, and a reduction in the likelihood of skin irritation.
Brief Description of the Drawings
An embodiment of the invention will now be described with reference to the accompanying drawings, in which:
Fig. 1 is an exploded perspective view of a prior art nasal mask;
Fig. 2 is a perspective view of the prior art nasal mask of Fig. 1; Fig. 3 is a perspective view of the prior art nasal mask attached to a wearer;
Fig. 4 is a rear perspective view of a mask cushion embodying the present invention;
Fig. 5 is a cross-sectional view along line 5-5;
Fig. 6 is a perspective view of a nasal mask including the cushion of Figs. 4 and 5; and
Fig. 7 is a perspective view of the nasal mask of Fig. 6 secured to a wearer's head.
Description of the Preferred Embodiments Fig. 4 shows a perspective view of a nasal cushion 30 embodying the invention. Fig. 5 shows the cross-sectional view along line 5-5. The cushion 30 comprises a substantially triangularly shaped frame 32 from which extends a membrane 34. The frame 32 has a scalloped edge 36 by which the cushion 30 is affixed to a mask body, as presently will be described. The membrane 34 has an aperture 38 into which the wearer's nose is received in use of the cushion 30. The membrane 34 is spaced away from the rim 40 of the frame 32, and its outer surface 41 is of substantially the same shape as the rim 40. The outer surface 41 of the membrane 34 and the rim 40 of the frame 32 also can be described as generally saddle shaped. The shaping of the outer surface 41 of the membrane 34 and the rim 40 of the frame 32 also include respective notches 42,44 that receive the bridge of the wearer's nose in use of the cushion 30.
As is best seen in Fig. 5, the frame 32 and the membrane 34 are integrally formed, typically by in a one-shot molding process. The frame 32 and the membrane 34 are fabricated from a resilient material. One suitable such material is Silastic ™ silicone elastomer manufactured by Dow Corning. The frame 32, in one preferred embodiment, has a typical thickness at its rim 40 of 1.5 mm. The membrane 34, in a preferred embodiment, has a typical thickness of 0.35 mm. In this way, the membrane 34 is relatively more flexible than the rim 40.
In use of the cushion 30, a wearer's nose will be inserted in the aperture 38 to engage a seal forming portion 45 (formed between the dashed lines) of the outer surface 41 to cause deformation of the membrane 34. Depending upon the securing force supplied to the membrane 34, it may deform to a point where it butts against the rim 40 of the frame 32. The frame 32 has a rigidity sufficient to withstand usual securing pressures in use of the cushion 30 to tend to retain its shape and resist deformation. It thus acts as a supporting structure.
Referring now to Fig. 6, the nasal cushion 30 is shown attached to a mask body 46 by the edge 36 of the frame 32, adhered or otherwise secured to a flange 48 of the mask body 46. Only the outer surface 41 of the membrane 34 can be seen. The flange 48 includes three slots 50-54 from which tensioning straps can be attached to secure the cushion 30 and the mask body 46 (in combination) to the head of a wearer. The mask body 46 forms a cavity that can receive the nose of the wearer by the aperture 38. A port 56 is provided at the top of the mask body 46 by which breathable gas can be supplied to the chamber.
Referring now to Fig. 7, there is shown a nasal mask 60 including the mask body 46 and the mask cushion 30. A coupling tube 62 is connected at one end with the inlet port 56, and at the other to a socket 64 into which can be received a gas delivery tube (not shown) for the supply of breathable gas to the chamber internal of the mask body 46. The mask body 46 also has two vent openings 66 by which expired gas is exhausted. A first fastening strap 68 is fixed between to the lower two slots 50,54. The upper slot 52 receives an arm 70, the top end of which has a resilient pad 72 to engage the forehead of the wearer. The arm 70 has two slots 74,76 along its side edges, by which a second fastening strap 78 is secured.
In fitting the nasal mask 60, the wearer's nose is received through the aperture 38 into the chamber within the mask body 46. The seal forming portion 45 thus contacts both the surface of the wearer's nose and a portion of the wearer's face in the region between the base of the nose and the upper lip, and around the sides and over the bridge of the nose. The shape of the seal forming portion 45 is particularly suited to effectively seal the difficult region of the facial contour that is the crease between the sides of the nose and the face. Depending upon the tension applied by the fastening straps 68,78, a seal is formed with the membrane 34 remaining spaced from the rim 40 of the cushion frame 32. While the provision of pressurised gas to the chamber of the mask body 46 assists in the maintenance of a seal between the membrane 34 and the wearer's nose and face, it is not essential in most cases, and an effective seal will be formed absent any such pressurised gas. The seal formed between the membrane 34 and the wearer's nose and face is not in the nature of a rolling seal in the manner of prior art as shown in Figs. 1 to 3, as on relative movement of the mask 60 in relation to the wearer's head, the nose will be restrained by contacting the frame 32. Thus only limited relative motion between the mask 60 and the wearer's nose and face occurs.
The membrane 34 closely imitates the facial contour, and because of its relatively lesser stiffness than the frame 32, can conform to particular facial structures with minimum force, and without a tendency to fold or crease.
If the fastening strap 68,78 are tensioned to excess, the membrane 34 deforms to abut the rim 40 of the cushion 32, the frame 32 thus acting as an "end limit" . In such a configuration, almost zero relative movement can occur between the mask 60 and the wearer's head.
The nasal cushion 30 and nasal mask 60 has been described with reference to CPAP or assisted respiration treatment, however it is to be understood that the invention generally is applicable to any application where gas and/or atomised liquid is to be supplied to the entrance of the nasal airways. Such applications include nebulisers, gas masks and anaesthetic machines.

Claims

Claims:
1. A nasal mask cushion to sealingly connect a mask to a wearer's face, the cushion comprising: a substantially triangularly-shaped frame of resilient material having a rim to surround the wearer's nose; a membrane also of resilient material, the membrane being relatively more flexible than the frame, and being of the same general shape as said rim and fixed to and extending away from the frame so as to have an outer surface spaced from the rim, a portion of said outer surface forming a face contacting seal; and a nose-receiving cavity bounded by said frame and said membrane; and wherein said seal portion is generally coterminous with respect to said rim and is resiliently deformable towards the rim in use of the cushion.
2. A nasal cushion as claimed in claim 1, wherein said membrane and said rim each has a co-located notch to accommodate the bridge of a nose.
3. A nasal cushion as claimed in claim 1 or claim 2, wherein said membrane and said rim are substantially saddle-shaped.
4. A nasal cushion as claimed in claim 3, wherein said membrane is shaped so that said seal portion, in use, contacts at least a wearer's nose.
5. A nasal cushion as claimed in claim 4, wherein said seal portion, in use, contacts the facial tissue around the sides and over the bridge of the nose, and between the base of the nose and the top lip.
6. A nasal cushion as claimed in claim 1, wherein said rim and said seal portion are shaped to generally match facial contours of the facial tissue around the sides and over the bridge of the nose, and between the base of the nose and the top lip.
7. A nasal mask for connection to a wearer's face comprising: a mask body for connection with a supply of breathable gas; and a nasal cushion, the body and cushion defining a nose-receiving cavity, the cushion including: a substantially triangularly-shaped frame of resilient material having a rim to surround the wearer's nose; a membrane also of resilient material, the membrane being relatively more flexible than the frame, and being of the same general shape as said rim and fixed to and extending away from the frame so as to have an outer surface spaced from the frame, a portion of said outer surface forming a face contacting seal; and wherein said seal portion is generally coterminous with respect to said rim and is resiliently deformable towards the rim in use of the mask.
8. A nasal mask as claimed in claim 7, wherein said mask body includes attachment points.
9. A nasal mask as claimed in claim 8, further comprising securing straps fixed to said attachment points.
10. A nasal mask as claimed in claim 9, wherein said membrane and said rim each has a co-located notch to accommodate the bridge of a nose.
11. A nasal mask as claimed in claim 10, wherein said membrane and said rim are substantially saddle-shaped.
12. A nasal mask as claimed in claim 11 , wherein said membrane is shaped so that said seal portion, in use, contacts at least a wearer's nose.
13. A nasal mask as claimed in claim 12, wherein said seal portion, in use, contacts the facial tissue around the sides and over the bridge of the nose, and between the base of the nose and the top lip.
14. A nasal mask as claimed in any one of claims 7, 8 or 9, wherein said rim and said seal portion are shaped to generally match facial contours of the facial tissue around the sides and over the bridge of the nose, and between the base of the nose and the top lip.
15. Nasal CPAP treatment apparatus comprising: a flow generator for the supply of gas at a pressure elevated above atmospheric pressure; a gas delivery conduit coupled to said flow generator; and a nasal mask in turn coupled to said conduit to said nasal mask including: a mask body for connection with a supply of breathable gas; and a nasal cushion, the body and cushion defining a nose-receiving cavity, the cushion including: a substantially triangularly-shaped frame of resilient material having a rim to surround the wearer's nose; a membrane also of resilient material, the membrane being relatively more flexible than the frame, and being of the same general shape as said rim and fixed to and extending away from the frame so as to have an outer surface spaced from the frame, a portion of said outer surface forming a face contacting seal; and wherein said seal portion is generally coterminous with respect to said rim and is resiliently deformable towards the rim in use of the mask.
16. CPAP treatment apparatus as claimed in claim 15, wherein said mask body includes attachment points.
17. CPAP treatment apparatus as claimed in claim 16, wherein further comprising securing straps fixed to said attachment points.
18. CPAP treatment apparatus as claimed in claim 17, wherein said membrane and said rim each has a co-located notch to accommodate the bridge of a nose.
19. CPAP treatment apparatus as claimed in claim 18, wherein said membrane and said rim are substantially saddle-shaped.
20. CPAP treatment apparatus as claimed in claim 19, wherein said membrane is shaped so that said seal portion, in use, contacts at least a wearer's nose.
21. CPAP treatment apparatus as claimed in claim 20, wherein said seal portion, in use, contacts the facial tissue around the sides and over the bridge of the nose, and between the base of the nose and the top lip.
22. CPAP apparatus as claimed in any one of claims 15, 16 or 17 wherein said rim and said seal portion are shaped to generally match facial contours of the facial tissue around the sides and over the bridge of the nose, and between the base of the nose and the top lip.
PCT/AU1997/000450 1996-07-26 1997-07-16 A nasal mask and mask cushion therefor WO1998004310A1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
CA002261790A CA2261790C (en) 1996-07-26 1997-07-16 A nasal mask and mask cushion therefor
EP97930255A EP0956069B1 (en) 1996-07-26 1997-07-16 A nasal mask and mask cushion therefor
US09/230,491 US6357441B1 (en) 1996-07-26 1997-07-16 Nasal mask and mask cushion therefor
DE69730866T DE69730866T2 (en) 1996-07-26 1997-07-16 NOSE MASK AND PADDING THEREFOR
JP10508323A JP2000515784A (en) 1996-07-26 1997-07-16 Nasal mask and its cushion
AU34293/97A AU710733B2 (en) 1996-07-26 1997-07-16 A nasal mask and mask cushion therefor
US10/067,772 US6581602B2 (en) 1996-07-26 2002-02-08 Nasal mask and mask cushion therefor
US10/068,963 US7178527B2 (en) 1996-07-26 2002-02-11 Nasal mask and mask cushion therefor
US11/648,537 US8636006B2 (en) 1996-07-26 2007-01-03 Mask
US14/163,945 US9421339B2 (en) 1996-07-26 2014-01-24 Patient interface

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPO1265 1996-07-26
AUPO1265A AUPO126596A0 (en) 1996-07-26 1996-07-26 A nasal mask and mask cushion therefor

Related Child Applications (4)

Application Number Title Priority Date Filing Date
US09230491 A-371-Of-International 1997-07-16
US09/230,491 A-371-Of-International US6357441B1 (en) 1996-07-26 1997-07-16 Nasal mask and mask cushion therefor
US10/067,772 Division US6581602B2 (en) 1996-07-26 2002-02-08 Nasal mask and mask cushion therefor
US10/068,963 Continuation US7178527B2 (en) 1996-07-26 2002-02-11 Nasal mask and mask cushion therefor

Publications (1)

Publication Number Publication Date
WO1998004310A1 true WO1998004310A1 (en) 1998-02-05

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Country Status (9)

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US (12) US6112746A (en)
EP (6) EP1479406B1 (en)
JP (2) JP2000515784A (en)
AU (3) AUPO126596A0 (en)
CA (1) CA2261790C (en)
DE (3) DE29724224U1 (en)
ES (1) ES2227704T3 (en)
HK (1) HK1071083A1 (en)
WO (1) WO1998004310A1 (en)

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