Any and all applications for which a foreign or domestic priority claim is identified in the Application Data Sheet as filed with the present application are hereby incorporated by reference under 37 CFR 1.57.
Field of the Invention
The present invention relates to nasal pillows for use with a patient interface that provides a supply of pressurised gas to a recipient via the nasal passages. The invention also relates to a patient interface which includes nasal pillows, and which may also include associated elements such as headgear. The invention also relates to a system for providing a heated, humidified stream of gases to a user via a patient interface which is included as part of the system and which includes nasal pillows.
Description of the Related Art
The prior art includes a wide variety of interfaces for supplying gases to a recipient. The following are examples.
The prior art includes a nasal mask that can be used for supplying gases to a recipient. The nasal mask includes a perimeter seal that seals across, down each cheek alongside the nose and along the surface of the upper lip. The entire enclosed space is pressurised and the recipient may inhale the pressurised gas from the enclosed space. An example is the Flexifit 405 nasal mask sold by Fisher & Paykel Healthcare.
The prior art also includes a full face mask. The full face mask includes a perimeter seal that extends across the bridge of the nose downward along each cheek beside the nose to the jaw and along the jaw below the lower lip. The perimeter thereby encloses both the nose and mouth. The entire space within the mask frame is pressurised. The recipient may breathe the pressurised gas from the space through either the nose or mouth. An example is the Flexifit 431 interface sold by Fisher & Paykel Healthcare.
The prior art further includes an oral interface including an oral appliance that fits within the user's mouth. An example is the Fisher & Paykel Healthcare Oracle interface.
The prior art still further includes a nasal pillows interface in which headgear retains a soft plenum in the vicinity of the user's nose. A pair of flexible protrusions engage against the nares of the recipient. Typically, the protrusions are able to axially compress and have a lateral freedom of movement relative to the supporting cushion. Examples are the ResMed Mirage Swift™ II, the ResMed Swift LT, or the Fisher and Paykel Opus™ 360. A variety of different pillow configurations which could be used with these interfaces are described and shown in WO 2008/014543.
The prior art still further includes a nasal cannula interface. The nasal cannula interface includes a plenum portion that rests against the upper lip of the user and a pair of prongs. Each prong extends into the nostril of the user. An example is the Nasal-Aire interface made by Innomed, where gases are provided to the interface and the prongs by conduits or hoses that extend from the users nose across their cheeks, over their ears and around the back of their head.
Interfaces such as these are frequently used for delivering pressurised gases to a person being treated for obstructive sleep apnea (OSA) or other sleep disorders. These users typically wear the interface in a home sleeping environment. Comfort and effective sealing even under conditions of patient movement are major considerations.
In this specification where reference has been made to patent specifications, other external documents, or other sources of information, this is generally for the purpose of providing a context for discussing the features of the invention. Unless specifically stated otherwise, reference to such external documents is not to be construed as an admission that such documents, or such sources of information, in any jurisdiction, are prior art, or form part of the common general knowledge in the art.
The term “comprising” as used in this specification means “consisting at least in part of”. When interpreting each statement in this specification that includes the term “comprising”, features other than that or those prefaced by the term may also be present. Related terms such as “comprise” and “comprises” are to be interpreted in the same manner.
It is an object of the present invention to provide an interface that goes some way towards overcoming the disadvantages of the prior art such as the devices described above, or which at least provides users with a useful choice.
In a first aspect the invention may broadly be said to consist in a nasal pillow section for use as part of an apparatus for providing a stream of gases to a user, said pillow section in use located in front of the upper lip and below the nostrils of a user, said pillow section comprising:
Preferably said lower inner surface in said first aspect is shaped as a concavity.
Preferably said pillow gasket in said first aspect includes an open lower front portion that acts as said gases aperture, and said concavity runs generally between the base or bases of said nasal pillows, and the lower rear part of said open lower front portion.
Preferably the inwards curve of the concavity for said lower inner surface in said first aspect is 3 mm from the lower edge to the upper edge.
Preferably said lower inner surface in said first aspect preferably has a width of between 30 and 50 mm and most preferably 40 mm.
Preferably the height of said lower inner surface between the outer side of said pillows and the lower rear part of said open lower front portion wall in said first aspect is preferably between 20 mm and 30 mm and most preferably between 25 mm and 27 mm.
Preferably the height of said lower inner surface between the inner side of said pillows, and the lower rear part of said open lower front portion wall in said first aspect is preferably between 20 mm and 30 mm and less than the height of said lower inner surface between the outer side of said pillows and the lower rear part of said open lower front portion wall and most preferably between 23 mm and 25 mm.
Alternatively said lower inner surface in said first aspect is a substantially straight forward-sloping planar surface.
Preferably said pillow gasket in said first aspect includes an open lower front portion that acts as said gases aperture, and said substantially straight forward-sloping planar surface runs generally between the base or bases of said nasal pillows, and the lower rear part of said open lower front portion.
Alternatively said lower inner surface in said first aspect is slightly convex.
Preferably said pillow gasket includes an open lower front portion that acts as said gases aperture, and said slightly convex lower inner surface runs generally between the base or bases of said nasal pillows, and the lower rear part of said open lower front portion, said surface deviating 3 min or less from a straight line running between the base or bases of said nasal pillows, and the lower rear part of said open lower front portion.
In a second aspect the invention may broadly be said to consist in a nasal pillow section for use as part of an apparatus for providing a stream of gases to a user, said pillow section in use located in front of the upper lip and below the nostrils of a user, said pillow section comprising:
Preferably said nasal pillow section in said second aspect includes an open lower front portion that acts as said gases aperture, and said concavity runs generally between the base or bases of said nasal pillows, and the lower rear part of said open lower front portion.
Preferably the inwards curve of the concavity for said lower inner surface in said second aspect is 3 mm from the lower edge to the upper edge.
Preferably said lower inner surface in said second aspect preferably has a width of between 30 and 50 mm and most preferably 40 mm.
Preferably the height of said lower inner surface between the outer side of said pillows and the lower rear part of said open lower front portion wall in said second aspect is preferably between 20 mm and 30 mm and most preferably between 25 mm and 27 mm.
Preferably the height of said lower inner surface between the inner side of said pillows, and the lower rear part of said open lower front portion wall in said second aspect is preferably between 20 mm and 30 mm and less than the height of said lower inner surface between the outer side of said pillows and the lower rear part of said open lower front portion wall and most preferably between 23 mm and 25 mm
In a third aspect the invention may broadly be said to consist in a nasal pillow section for use as part of an apparatus for providing a stream of gases to a user, said pillow section in use located in front of the upper lip and below the nostrils of a user, comprising:
In a fourth aspect the invention may broadly be said to consist in a nasal pillow section for use as part of an apparatus for providing a stream of gases to a user, said pillow section in use located in front of the upper lip and below the nostrils of a user, said pillow section comprising:
Preferably said pillow gasket in said fourth aspect includes an open lower front portion that acts as said gases aperture, and said slightly convex lower inner surface runs generally between the base or bases of said nasal pillows, and the lower rear part of said open lower front portion, said surface deviating 3 mm or less from a straight line running between the base or bases of said nasal pillows, and the lower rear part of said open lower front portion.
In a fifth aspect the invention may broadly be said to consist in an interface for use as part of an apparatus for providing a stream of gases to a user, comprising:
Preferably said lower inner surface in said fifth aspect is shaped as a concavity.
Preferably said pillow gasket in said fifth aspect includes an open lower front portion that acts as a gases aperture and which is fluidically connected to said manifold section, and said concavity runs generally between the base or bases of said nasal pillows, and the lower rear part of said open lower front portion.
Preferably the inwards curve of the concavity for said lower inner surface in said fifth aspect is 3 mm from the lower edge to the upper edge.
Preferably said lower inner surface in said fifth aspect preferably has a width of between 30 and 50 mm and most preferably 40 mm.
Preferably the height of said lower inner surface between the outer side of said pillows and the lower rear part of said open lower front portion wall in said fifth aspect is preferably between 20 mm and 30 mm and most preferably between 25 mm and 27 mm.
Preferably the height of said lower inner surface between the inner side of said pillows, and the lower rear part of said open lower front portion wall in said fifth aspect is preferably between 20 mm and 30 mm and less than the height of said lower inner surface between the outer side of said pillows and the lower rear part of said open lower front portion wall and most preferably between 23 mm and 25 mm.
Alternatively said lower inner surface in said fifth aspect is a substantially straight forward-sloping planar surface.
Preferably said pillow gasket in said fifth aspect includes an open lower front portion that acts as a gases aperture and which is fluidically connected to said manifold section, and said substantially straight forward-sloping planar surface runs generally between the base or bases of said nasal pillows, and the lower rear part of said open lower front portion.
Alternatively said lower inner surface in said fifth aspect is slightly convex.
Preferably said pillow gasket in said fifth aspect includes an open lower front portion that acts as a gases aperture and which is fluidically connected to said manifold section, and said slightly convex lower inner surface runs generally between the base or bases of said nasal pillows, and the lower rear part of said open lower front portion, said convex surface deviating 3 mm or less from a straight line running between the base or bases of said nasal pillows, and the lower rear part of said open lower front portion.
In a sixth aspect the invention may broadly be said to consist in an interface for use as part of an apparatus for providing a stream of gases to a user, comprising:
Preferably said pillow gasket in said sixth aspect includes an open lower front portion that acts as a gases aperture and which is fluidically connected to said manifold section, and said concavity runs generally between the base or bases of said nasal pillows, and the lower rear part of said open lower front portion.
Preferably the inwards curve of the concavity for said lower inner surface in said fifth aspect is 3 mm from the lower edge to the upper edge.
Preferably said lower inner surface in said sixth aspect preferably has a width of between 30 and 50 mm and most preferably 40 mm.
Preferably the height of said lower inner surface between the outer side of said pillows and the lower rear part of said open lower front portion wall in said sixth aspect is preferably between 20 mm and 30 mm and most preferably between 25 mm and 27 mm.
Preferably the height of said lower inner surface between the inner side of said pillows, and the lower rear part of said open lower front portion wall in said sixth aspect is preferably between 20 mm and 30 mm and less than the height of said lower inner surface between the outer side of said pillows and the lower rear part of said open lower front portion wall and most preferably between 23 mm and 25 mm.
In a seventh aspect the invention may broadly be said to consist in an interface for use as part of an apparatus for providing a stream of gases to a user, comprising:
In an eighth aspect the invention may broadly be said to consist in an interface for use as part of an apparatus for providing a stream of gases to a user, comprising:
Preferably said pillow gasket in said eighth aspect includes an open lower front portion that acts as a gases aperture and which is fluidically connected to said manifold section, and said slightly convex lower inner surface runs generally between the base or bases of said nasal pillows, and the lower rear part of said open lower front portion, said surface deviating 3 mm or less from a straight line running between the base or bases of said nasal pillows, and the lower rear part of said open lower front portion.
In a ninth aspect the invention may broadly be said to consist in a system for providing a heated, humidified stream of gases to a user, comprising:
To those skilled in the art to which the invention relates, many changes in construction and widely differing embodiments and applications of the invention will suggest themselves without departing from the scope of the invention as defined in the appended claims. The disclosures and the descriptions herein are purely illustrative and are not intended to be in any sense limiting.
One preferred form of the present invention will now be described with reference to the accompanying drawings in which:
The present invention provides an interface for use as part of an apparatus for providing a stream of gases to a patient. The preferred and alternative embodiments are for use as part of an apparatus for providing a stream of heated, humidified gases at a pressure above atmospheric pressure to a user for the purposes of CPAP therapy or similar. However, it should be noted that the interface is not limited for use as part of an apparatus for providing CPAP therapy—the interface could also be used for Bi-PAP or variable pressure therapy, as part of an apparatus used for an anti-snoring treatment regime, for the treatment of COPD, or as part of any therapy regime where a stream of gases at a pressure greater than atmospheric is delivered to the breathing passages of a patient or user via an interface assembly.
The preferred embodiment will now be described in detail with reference to the Figures. However, it should be noted that many variations are possible which have not been specifically described, without departing from the intended scope of the present invention.
Gases Supply System
It should also be noted that a modular system has been described above—that is, a system where the humidifier unit 4 is a separate unit to the blower unit 3. An integrated system could also be used—that is, a system where the blower unit and the humidifier unit are two integral parts of a single unit, or where the blower unit and the humidifier unit are rigidly attached or connected together in use.
In use, one end of a main supply conduit 19 is connected to the humidifier outlet 9. The heated and humidified gases stream exits the humidifier unit 4 via the humidifier outlet 9 and enters the main supply conduit 19, passing along the supply conduit 19 to an interface assembly 10 which is connected to the user end of the supply conduit 19. The supply conduit 19 can either be directly connected to the interface assembly 10, as shown in
Supply Conduit and Interface Conduit
In the preferred embodiment, the supply conduit 19 is a flexible tube formed from a plastic type material, many different variations of which are known in the art. One end of the supply conduit 19 is connected to the humidifier outlet port 9, with the other end connected either directly to the interface assembly 10, or connected to the distal end 190a of the interface conduit 190, the interface conduit 190 connected to the interface core section 11. The most preferred form of interface conduit 190 is approximately 30 cm or 1 foot in length, with an external diameter of between 1-2 cm and a thin ribbed wall, the ribs being approximately 2-3 mm thick and the wall between the ribs being significantly less that 1 mm thick. However, it should be noted that variations from these dimensions are possible without departing from the scope of the invention, and for example a non-ribbed conduit could be used if required. It should further be noted that ‘flexible tube’ as it is used in this specification should be taken to mean that the tube or conduit is flexible enough so that it is capable of being bent or deformed repeatedly (for example, by bringing the two ends of the conduit together, or by tying a loose knot in the conduit if it is long enough—e.g. approximately 30 cm or more in length), with the tube or conduit returning to its original undeformed shape with little to no plastic deformation occurring, every single time the tube or conduit is bent or deformed in this manner.
In the most preferred form, neither of the supply conduit 19 or the interface conduit 190 will rigidly support their own weight when held at one end so that the main body of the conduit extends outwards generally horizontally from the held end. Over a 20-30 cm length of supply conduit (which has a diameter of 1-2 cm and a wall thickness at the ribs of 1-3 mm and a wall thickness between the ribs of less than 1 mm), the unsupported end of the interface conduit will bend to face substantially directly downwards. For example, the interface conduit of the Swift LT™ is formed in such a manner that over a 20-30 cm length, the unsupported end will bend downwards so that it points substantially vertically downwards. The interface conduit used in the Opus is somewhat stiffer, but will still bend through an angle of very approximately 45 degrees. Both of these conduits are flexible for the purposes of this specification, and should not be thought of as ‘rigid’ or ‘semi-rigid’ (see Lexicon section for more details). The main supply conduit 19 is of similar flexibility to both of these items, but is generally slightly less flexible.
The conduits 19, 190 connect to each other, or to the interface assembly 10, or both, by a friction push fit, a bayonet connection or similar, or by any other suitable connection as might be known in the art.
Interface Assembly
Specific preferred forms of an interface assembly are shown in
The interface assembly (e.g. assemblies 200, 300, 400) are assembled from two main parts: an interface core portion or interface core section 11, and a headgear assembly 12.
The interface core section 11 and the supply conduit 19 (either including or excluding the interface conduit 190) are mutually adapted so that one end (the patient end or proximal end) of the supply conduit 19 is fluidically or gaseously connected to the interface core section 11 in use, the interface core section 11 adapted so that the supply of heated, humidified gases is provided to the interior of the interface core portion 11 from the supply conduit 19 via this connection. The preferred forms of this connection will be described in detail below.
Headgear Assembly
The headgear assembly 12 is formed from two main items: a set of arms 13 that extend in use one from each side of the interface core portion 11, and a set of headgear straps 14. In the preferred embodiments, the arms 13 are formed from either a flexible or a semi-rigid plastic, backed with neoprene, foam, or similar to form a cushion portion, the cushion portion resting against the face of a user in use.
The arms 13 can be connected to the interface core portion 11 in a number of ways. For example, arms 213 could be integrally formed or integrally connected with the interface core portion 211, as shown in the embodiment of
For all of the preferred forms, the headgear straps 14 extend around the rear, or over the top of a user's head (or both) in use, to support the interface assembly 10 in position in use. In the embodiment of
In alternative embodiments, such as those shown in
It is preferred that all the different embodiments of headgear straps 13 include a secondary upper strap 20 which passes across the top of a user's head, as well as the main strap 14 which passes behind the user's head. The secondary upper strap 20 is arranged so that it passes across the top of a users head, with each end of the secondary strap 20 connecting to the main strap 14 just behind the ears of a user. Each of these straps 14, 20 includes an adjustment mechanism such as buckles 15a, 15b or similar. These could be Velcro™ adjusters or buckles as preferred. The headgear secondary upper strap 20 could also be independently formed and connected to the main strap 14. The adjustments could be at any location on the strap that is convenient—sides, front or rear. The straps 14, 20 could be of different widths or thicknesses as required for user comfort. For example, in the most preferred form, the main strap 14 is wider than the secondary strap 20.
Suitable strap materials may include a woven elastic strip or a narrow strip of foam and fabric, such as Breathoprene™. Alternatively, the headgear could be formed from silicone, or coated with silicone. The headgear arms could be padded or cushioned on their inside surfaces if they are formed from silicone, in order to increase user comfort. Padding could also be added to the preferred form of arms—those made from Breathoprene™ or similar.
Interface Core Section—General
The interface core section 11 of the preferred forms is formed so as to act as a manifold in use, receiving gases from the supply conduit 19. The connection between the interface core section 11 and the patient or user end of the supply conduit 19 can be made by way of a push-fit connection or similar. In one preferred form (not specifically shown), the interface core section 11 is formed as a one-piece item, and an aperture or connector portion which is adapted to receive the patient end of the supply conduit 19 is formed directly in this one-piece item. In this form, the end of the supply conduit 19 is connected directly to the one-piece interface core section 11—e.g. by pushing it into the aperture located on the interface core section 11, or by connecting it to the connector portion. However, in other preferred forms, this aperture is located on a separate sub-item or sub-assembly that is included as part of the interface core portion 11 when the interface core section 11 is assembled, but is initially formed as a separate item.
Interface Core Section—First Preferred Form
An example of an interface core section 211 that has a manifold section and a connector that is initially formed as a separate item is shown in
Interface Core Section—Second Preferred Form
An example of a second preferred form of interface core section 311 that includes an elbow connector is shown in
Interface Core Section—Third Preferred Form
Yet another example of an interface core section that includes an elbow connector is shown in
Interface Core Section—Pillow Section
The interface core section 11 also includes a pillow section 50, the pillow section including pillows 50-1 which are adapted to substantially seal against the nares of a user in use. The pillow section 50 is fluidically connected to the manifold section 11-1 so that in use the heated, humidified gases stream enters the pillow section 50 from the manifold section 11 and passes through the pillows 50-1 into the nasal cavity of a user. ‘Substantially seals’ as it is used in this specification should be taken to mean that perfectly sealing against the nares with no leaks is the most desirable outcome. However, a small degree of leakage in use is almost certainly inevitable, and a person skilled in the art will understand that the phrase ‘substantially sealing’ is intended to indicate that a very small amount of leakage may sometimes, but not always, occur. As the pillows 50-1 are substantially sealed against the nares of a user, all or substantially all of the stream of gases which passes through the manifold section 11 and the nasal pillow section 50 will be delivered to a user.
As shown in the preferred embodiments of
In order to aid in sealing the nasal pillows 50-1 against the nares of a wide variety of users, each of whom will have differently shaped and sized nostrils, the pillows 50-1 are in the preferred form formed from a soft and supple material with a high degree of flexibility, such as silicone rubber or similar. Preferred forms of the nasal pillows 50 are described in detail below.
The nasal pillow section 50 can either be formed separately from the rest of the core portion 11, or integrally formed with the core portion 11. In the preferred embodiments as shown in
The nasal pillow section 50 is formed from two main parts in the three preferred fowls described herein: a base portion or nasal pillow gasket portion 50-2, and nasal pillows 50-1. The attachment or connection of the nasal pillow section 50 to the remainder of the core portion 11 is achieved by attaching the gasket portion 50-2 to the manifold portion 11-1, with the pillows 50-1 preferably (although not always) integrally formed with the gasket portion 50-2. The embodiments of
In the preferred embodiments, at least the pillows 50-1 are formed from a supple and flexible material, such as silicone rubber.
Pillow Gasket—First Preferred Form
The first preferred form of pillow gasket portion 250-2 shown in
The preferred form of pillow gasket portion 250-2 includes an open lower face or open lower front portion 237 which corresponds in use to the open rear face (not shown) of the manifold section 211-1, so that in use it acts as a gases aperture. It should be noted that the open rear face and the open lower portion 237 could be apertures—these do not have to cover the entire ‘face’. In use, the perimeter of the open lower portion 237 of the pillow gasket portion 250-2 is connected to the open rear face of the manifold section 211-1. The wall 237a which surrounds the open lower portion 237 slots or locates into the open rear face of the manifold section 211-1, and substantially seals against it. It can be seen that all of the gases passing through the manifold section 211-1 will pass into the pillow gasket portion 250-2 and from there into the nasal pillows 250-1. It should be noted that the pillow gasket portion 250-2 can be attached and removed repeatedly from the manifold portion 211-1 as required by a user. Optionally, if required, a key 238 can be formed into the wall section 237, the key 238 slotting into a corresponding slot in the manifold section 211-1 to ensure the pillows are correctly oriented in use.
In the first preferred form of pillow gasket portion 250-2, the pillow gasket 250-2 is shaped so that the two side portions are slightly angled towards one another. That is, the top surface which covers the open rear face of the manifold 8 appears to have a V-shape when viewed from the front, with the pillows 250-1 one on each of the two sub-surfaces or inner faces of the ‘V’. The angle of the ‘V’ is not acute—each edge or plane of the ‘V’ of the pillow gasket portion 250-2 is raised by a few degrees only (e.g. 5-10 degrees). The pillows 250-1 are mounted one on each of the two planes, and are in this manner angled inwards towards one another slightly in the most preferred form (although there are of course many other ways in which this could be achieved without creating a ‘V’-shape).
In the preferred form, as described above, the nasal pillows 250-1 and the gasket portion 250-2 are formed as a one-piece item. However, the pillows 250-1 could be removably connected to the gasket portion 250-2, either individually or as a pair. For example, the gasket portion 250-2 could include a pair of stub bases to which the pillows are press-fitted in use, the stub base and the base of the stem 250-3 being mutually adapted to connect together by way of a press-fit, a keyed connection, or similar. This would potentially allow pillows which are of different shapes or sizes to be fitted to the pillow gasket portion 250-2. This would be advantageous if a user required pillows moulded specifically to the shape of their nares, or pillows of different sizes. This would also allow a range of standard pillows to be manufactured, the range having different sizes or different shapes, or both. This would provide a range of off-the-shelf adjustment.
In the very most preferred forms, the pillow gasket portion 250-2 is formed so that in normal use, the pillow gasket portion 250-2 is held off or apart from the upper lip of a user 2, the intention being that there is no contact or minimal contact between the gasket portion and the lip of a user in use. When the phrase ‘no contact’ is used in this specification, it should be taken to mean that there is no intentional contact, and any contact that does occur is outside the intended normal operating condition of the interface. Surprisingly, and in contrast with what has previously been known in this area of the art, it has been found that minimising contact with the upper lip of a user is in certain circumstances beneficial. Some prior art devices have actively used the upper lip as a support for the pillow gasket portion, even in some cases going as far as to have a lower rear portion of the gasket which can be at least semi-inflated by the gases passing through the pillow gasket. It is intended in these designs that the inflated/inflatable lower rear portion acts as a lip cushion and aids in providing support.
Surprisingly however, it has been found that having a pillow gasket which minimises contact with the upper lip of a patient can also be beneficial for some users, and can act to increase the user's comfort levels and compliance with their therapy regime. Surprisingly, it has also been found that movement of a user's upper lip can in some cases have more of detrimental effect on the sealing of pillows against the nares of a user 2 than is known in the art at the present time, or was anticipated. Because this detrimental effect was not anticipated, it was not compensated for when designing the interfaces which are currently known in the art. It has been found that in some cases when using the prior art interfaces that movement of the user's lip causes an excessive amount of movement of the interface core portion and pillows—more than was originally anticipated for interface designs which include lip cushions. Therefore, when using the prior art designs, there is an increased likelihood that the seal between the nares of a user 2 and one or both of the pillows 50 will fail, at least momentarily. The pillows of the present invention offer a useful, new, and surprising alternative to the prior art, with contact between the pillows and the lip minimised as far as possible.
There are several different ways this minimised or no contact can be achieved. The preferred forms will now be described with particular reference to
In the first most preferred form as shown in
The critical dimensions of the very most preferred form are shown in
The lower inner surface 500 could alternatively be a substantially straight planar surface running between the lower end or base of the stein 253 and the rear of the wall 237a. That is, this forward end or edge of the plane in the embodiment of
It can be seen that the planar surface will be at an angle to the vertical—it will be forward-sloping, with the lower edge forward of the rear edge, the angle of slope dictated to a great extent by the locations of the gases supply aperture of the manifold section, and the lower end or base of the stems. It should be noted that the plane does not have to begin and end at these positions, but it is preferred that the edges are substantially at these positions.
As shown in
In the embodiment shown in
The second most preferred form will now be described with reference to
In a similar fashion as for the first most preferred form described above with reference to
The third preferred form of pillow gasket will now be described with reference to
It should be understood that there are several other design requirements for a patient interface, and in particular the interface core section and pillows, aside from increasing user comfort and compliance by minimising contact with the users upper lip (where this minimised contact is considered to be appropriate or beneficial). For example, as well as user comfort, there is the requirement that a good seal is formed between the pillows and the nares, that the pillows and gasket form an internal gases passageway that is of a size and shape to allow the passage of heated humidified gases without overly impeding the gases flow and without causing gases flow or pressure to be outside a desirable range, etc. A person skilled in the art, having access to the description relating to the preferred embodiments as outlined above and below, would be able to ascertain e.g. the exact dimension or shape which they require from within a suitable range, which would have the desired overall effect.
Pillow Gasket—Second Preferred Form
The second preferred form of pillow gasket is shown in
The main difference between the pillow gasket portion 250-1 and the pillow gasket portion 350-2 is that the second preferred form of pillow gasket 350-1 is held in position on the manifold section 311-1 by a pair of protrusions 338 on the gasket portion 350-2 which slot into corresponding apertures on the manifold section 311-1. In the form shown in
Pillow Gasket—Third Preferred Form
A third preferred form of pillow gasket is shown in
The manifold section 411-1 and the main body of the gasket section 450-2 of the pillow section 450 of this third preferred form when assembled for use have the overall general form of a cylinder, which in use is aligned across the top lip of a user. The manifold section 411-1 includes an aperture at one side of the manifold section 411-1, formed in the end section 411-1b, the aperture adapted to receive one end of the elbow connector 411-2 in use. The elbow connector 411-2 and the manifold section 411-1 are adapted to rotate freely relative to each other in use, the plane of rotation of the elbow connector aligned back-front of a user 2 in use, rather than side-side as in the embodiment of
In this third preferred form, the pillow section 450 is removably attached to manifold section 411-1. When the pillow section 450 and the manifold section 411-1 are connected, the two nasal pillows 450-1 extend outwards and upwards from the cylindrical main portion, towards the nares of a user 2 in use.
The manifold section 411-1 is formed from a semi-rigid plastic, with a central cross-brace body section 411-1a, and two end sections 411-1b and 411-1c. A cap 470 closes off one end—end 411-1c—in use (the opposite end from the elbow connector 411-2).
The gasket section 450-2 of the pillow section 450 has the general overall form of a cylinder, the gasket section 450-2 and the manifold section 411-1 mutually sized so that the gasket section 450-2 slots between the end sections 411-1b and 411-1c. The gasket section 450-2 includes a slit 451 which runs along the length of the cylindrical body, at the bottom front of the cylindrical body, opposite the pillows 450-1. In use, the slit 451 in the gasket section 450-2 is held closed by engagement of the edges of the slit with the cross-brace body section 411-1a.
The ends of the headgear straps 413/414 in this third preferred form include connectors 452 which engage with the ends of the manifold section 411-1 to hold the manifold section and pillow section 450 in place on the face of a user in use.
In a similar manner to that described above for the first and second preferred forms or preferred embodiments, the lower rear part of the gasket section 450-2 can if required) be rounded inwards in a concave fashion, so that there is no contact between the upper lip of a user 2 and the rear of the gasket portion 450-2 of the pillow section 450 of the third preferred form. One way in which this concavity can be achieved is shown in
In a similar manner to the first and second preferred forms, the concavity is intended to minimise contact in use with the upper lip of a user 2. The lower inner surface 800 could alternatively be a straight planar surface running between the lower end or base of the stems 453 and the lower inner edge or side of the slit 451, or another appropriate point or plane running across the rear of the gasket portion 450-2—for example, the outer, lower edge of the planar surface could be substantially close to the lowermost point of the gases supply aperture formed in the end section 411-1b (which is also substantially close to where the lower inner edge or side of the slit 451 is located). One ‘straight surface’ example is shown in
A bridging platform (not shown) can also be used in a similar fashion to the bridging platforms 254, 264, 274 as described above in relation to the first and second gaskets. The bridging platform can include an indented profile if required, similar to that already described.
The stems 453 for this form are shown as flared towards their top end, where the stems 453 meet and merge with the bottom of the caps 455. It should be noted that if required, the stems 253 could alternatively be straight-sided, or at least not flared towards the top end.
Pillows
As described above, there are three particularly preferred forms of interface assembly, which have several common elements and several elements which are unique to that particular preferred form. Many different forms of pillow design can be used with the preferred embodiments described above. For example, the pillows shown in the preferred embodiments of
It should be noted that different designs of pillow can be used with the preferred forms of interface assembly as described above. For example, the stems or stalks 53 could be ribbed, as described in co-pending U.S. application 61/060,855, the contents of which are incorporated by reference.
Also, if required, pillows having a double-cap structure (an inner cap and an outer cap) could be used.
It should also be noted that a ‘single pillow’ structure could be used, with one pillow or item delivering gas to the nostrils of a user—for example, a pillow structure with a single stern that bifurcates into two caps just below the nostrils, or a single cap shaped to deliver gas to both nostrils simultaneously, the single cap being fed a gases stream through either a single or a double stem. ‘Nasal pillows’ in this specification should be read as covering at least these different possible designs, and not just the paired stalk and cap arrangement described above. ‘Nasal pillows’ in this specification should also, if appropriate, be taken to mean a nasal mask—for example, a silicone nasal mask fluidically connected to the gasket, the gasket in use being located underneath the nostrils of a user and in front of the upper lip of a user. The nasal mask (‘nasal pillows’) would extend from the gasket, covering around at least part of the outside surface of the nose of a user and substantially sealing against the skin of a user so that the stream of heated humidified gases is delivered to the nare of the user.
The features described above can be used individually or in any combination in the pillows and interface of the present invention.
Lexicon
‘Supple’ or ‘flexible’ as these words are used in this specification with reference to e.g. the nasal pillows should be taken to mean that the item can be substantially and repeatedly deformed—e.g. by a user pinching, squashing or crushing it in their hand, with the item returning to its original shape with little to no plastic deformation occurring. An item having a rectangular or square cross-section, with a thickness of 1-2 mm, a width of e.g. 1 cm, and a length of 5 cm or more, formed from a ‘supple’ or ‘flexible’ material as it should be understood in this specification, will, if held at one end, bend to an extent easily appreciable to the naked eye—i.e. it will bend at least 2-3 mm. The most preferred materials having ‘supple’ or ‘flexible’ properties as they should be understood within the context of this specification will, if formed in the manner referred to above, bend completely—that is, bending enough so that the unsupported end points substantially directly downwards. If the material does not bend to an appreciable extent, then it is a rigid or semi-rigid material for the purposes of this specification—see below. It should also be understood that ‘flexible’ is intended to mean a material that is soft, supple and flexible enough that an item formed with the dimensions outlined above (1-2 mm.times.10 mm.times.50 min) could be rolled into a solid tube (i.e. with no central ‘hollow’ portion), and when the tube is unrolled there would be little to no plastic deformation of the material.
‘Rigid’ or ‘semi-rigid’ as it is used in this specification should be understood to mean that an item described in this manner can be elastically deformed, but that it would require application of an external force apart from gravity (i.e. more than its own weight) to do so—a ‘rigid’ or ‘semi-rigid’ item will not collapse or bend under its own weight, in any orientation. It is noted that all items usually described as rigid do have a certain degree of elasticity, but the elastic limit will normally be reached before the elastic deformation of the rigid material is appreciable to the naked eye. Glass, for example, will shatter before the average person is able to appreciate that it has elastically deformed at all. An item having rectangular or square cross-section, with a thickness of 1-2 mm and a length of up to 10 cm, formed from a ‘rigid’ or ‘semi-rigid’ material as it should be understood in this specification, will not bend to an extent easily appreciable to the naked eye. As an example, the arms of the Fisher & Paykel Opus™ interface or the ResMed Mirage Swift™ II interface are around 10-11 cm long and have a thickness of less than 1 mm. The arms of these devices are formed from a plastic having a rigidity so that they will not bend under their own weight if held at one end, and for the purposes of this specification can be considered to be ‘rigid’ or semi-rigid'.
‘Substantially vertically downwards’ as it is written in this specification should be interpreted as not necessarily meaning absolutely vertical—an angle of 10-20 degrees or more off-vertical lies within the meaning of ‘substantially vertical’ as it is used in this specification.
It should also be noted that ‘downwards’, ‘outwards’, ‘inner’, ‘outer’, ‘rear’, ‘front’, and similar terms as they are used in this specification refer to the mask being worn by a user who is standing up. For example, ‘inner’ and ‘rear’ refer to that side of the interface nearest a users face in use. However, in use the interface is intended to be used by a user who is asleep and will be lying on a bed, either on their back, front or side. The convention referred to above (a user standing) has been adopted for ease of reference.
It should also be noted that the term ‘interface’ or ‘interface assembly’ as it is used in this specification refers to any combination of the interface core section 11 (or 211, 311 or 411), the interface conduit 19 or supply conduit 190 (or both), and the headgear assembly 12—that is, for the preferred embodiment, the term ‘interface’ could refer to the interface core section 11 with or without the headgear assembly 12, and with or without the supply conduit 19.
The terms ‘swivel’ and ‘rotate’ have their normal dictionary definitions. However, it should specifically be noted that as used in this specification, ‘rotate’ means that the item turns around an axis or centre point and movement is in a single plane. In contrast, ‘swivel’ as used in this specification should be taken to mean that the item is capable of movement in more than one plane.
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Number | Date | Country | |
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20190030273 A1 | Jan 2019 | US |
Number | Date | Country | |
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61104377 | Oct 2008 | US |
Number | Date | Country | |
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Parent | 15610530 | May 2017 | US |
Child | 15905644 | US | |
Parent | 13123503 | US | |
Child | 15610530 | US |