Patent Description:
Headgear is used to secure user interfaces during breathing treatments. Improvements to the headgear are desired to provide easier to use headgear as well as more comfortable headgear. Relevant prior art includes <CIT> which discloses a headgear assembly with two hook tabs at the end of a strap. <CIT>which discloses a nappy with a hook tab having two fingers and <CIT> which discloses a nasal mask with hook and loop attachments comprising two reinforcing fingers for each tab.

The present invention provides a headgear assembly as claimed. A variety of configurations are shown and described herein that will provide improved fit, form and/or function to headgear and/or that will provide the public with a useful option.

Headgear for a breathing interface is provided. The headgear comprises at least the one strap with the at least one strap having a customizable stretch characteristic.

In some configurations, the at least one strap includes at least one receiving region that is configured to receive an insert, the insert being rigid or semi-rigid.

In some configurations, the insert is removable from the receiving region.

In some configurations, the insert is movable among two or more of the at least one receiving regions. In some such configurations, wherein the insert can be replaced by a second insert that is receivable within the receiving region.

In some configurations, the at least one strap includes multiple separable segments. In some such configurations, the multiple separable segments are positioned internally within the at least one strap. In some such configurations, two adjacent segments of the multiple separable segments are configured to be dislocated from each other to provide a custom stretch characteristic in one or more locations.

In some configurations, the at least one strap incorporates a stretch component, a relatively non-stretch member and two or more buckles that interconnect the at least one strap and the relatively non-stretch member. In some such configurations, the stretch component has a greater length than the relatively non-stretch member. In some such configurations, the two or more buckles are adjustable along a length of the relatively non-stretch member. In some such configurations, the two or more buckles are adjustable such that an intermediate length of the stretch component disposed between the two buckles can be varied. In some such configurations, adjusting the spacing between the two or more buckles adjusts the amount of the stretch component that is secured to the relatively non-stretch member and, therefore, unable to stretch. In some such configurations, the relatively non-stretch component comprises a hollow portion through which the stretch component passes. In some such configurations, the two or more buckles attach to the non-stretch component with the stretch component being secured within the non-stretch component.

In some configurations, the at least one strap incorporates a stretch component, a relatively non-stretch member and two or more limiters that interconnect the at least one strap and the relatively non-stretch member. In some such configurations, the stretch component has a greater length than the relatively non-stretch member. In some such configurations, the nonstretch member comprises two or more apertures that receive the two or more limiters and the stretch member comprises two or more apertures. In some such configurations, the nonstretch member comprises at least three openings and the stretch component comprises at least three openings. In some such configurations, the two or more apertures of the non-stretch member have a first spacing and the two or more apertures of the stretch member have a second spacing. In some such configurations, the second spacing is the same as the first spacing. In some such configurations, the second spacing is different from the first spacing. In some such configurations, the second spacing is less than the first spacing. In some such configurations, the two or more limiters are connected for movement. In some such configurations, a hinge connects two adjacent limiters such that depressing one causes a lifting of the other.

In some configurations, a connector is configured to the attached to the at least one strap and the connector comprises a passage through which the at least one strap passes. In some such configurations, the connector comprises a clamping configuration that secures the connector in position along the at least one strap. In some such configurations, the clamping configuration comprises a living hinge between a first portion and a second portion of the connector and the first portion can be brought into engagement with the second portion with the connector positioned in a desired location along the at least one strap. In some such configurations, the clamping configuration comprises a locking mechanism that can be provided as part of the connector. In some such configurations, the locking mechanism includes a push-button that can lock the connector in position along the at least one strap. In some such configurations, the locking mechanism includes a hinge system that locks onto the at least one strap.

In some configurations, at least a portion of the at least one strap comprises a thermoplastic element. In some such configurations, the at least one strap comprises a woven or braided construction that integrates the thermoplastic element. In some such configurations, the at least one strap can be provided with regions of different stretch characteristics through the use of ultrasonic welding. In some such configurations, one or more connectors can be attached to the at least one strap in a region that has undergone forming.

In some configurations, the headgear features upper straps, lower straps and a top strap. In some such configurations, the headgear comprises a three dimensional shape when not being worn such that the headgear does not lie flat when not being worn.

The headgear can be used with a patient interface.

In some such configurations, the patient interface is selected from the group consisting of full face mask, nasal mask, nasal pillows, non-invasive or a cannula. In some such configurations, the headgear and the patient interface are connected by connectors. In some such configurations, the connectors comprise clips. In some configurations, the interface comprises a delivery conduit. In some such configurations, the delivery conduit is connected to the interface with a ball joint, which may be removable. In some such configurations, the delivery conduit comprises a swivel connector. In some such configurations, the interface comprises a frame and a cushion that is removable from the frame. In some such configurations, the interface further comprises an anti-asphyxiation valve. In some such configurations, the interface further comprises bias flow holes. In some such configurations, the interface further comprises a forehead support. In some such configurations, the patient interface does not comprise a forehead support.

The present invention provides a headgear assembly for use with a patient interface. The headgear assembly comprises at least one strap. The at least one strap comprises an end with a hook component. The hook component is securable to a loop component. The hook component comprises at least two fingers that are spaced apart from each other by a gap such that lifting one of the at least two fingers will not result in lifting of the other of the at least two fingers.

In some configurations, the two or more fingers are symmetrical with each other.

In some configurations, the two or more fingers are asymmetrical with each other.

In some configurations, the gap results in the at least two fingers defining a forked configuration.

In some configurations, the gap is centrally positioned along the hook component.

In some configurations, one of the at least two fingers at least partially surrounds another of the at least two fingers. In some such configurations, one of the at least two fingers completely surrounds another of the at least two fingers. In some such configurations, one of the at least two fingers defines a central tab and another of the at least two finger defines an outer tab that circumscribes the central tab.

In some configurations, one of the at least two fingers only partially surrounds another of the at least two fingers.

In some configurations, the gap extends inwardly from a lateral edge of the hook component. In some such configurations, a second gap extends inwardly from a second lateral edge of the hook component and two fingers are defined with a narrow section connecting to a wide end.

In some such configurations, the at least one strap comprises a single strap.

In some such configurations, the at least one strap comprises an upper strap and a lower strap.

In some such configurations, the at least one strap comprises an upper strap, a lower strap and a crown strap.

In some configurations, a strap is provided for a breathing assistance apparatus interface. The strap comprises a first portion and a second portion that combine to form a hollow tubular configuration. The first portion has different properties from the second portion at the same axial location along the strap.

In some such configurations, the first portion is an outer portion and the second portion is an inner portion and the outer portion has greater rigidity than the inner portion.

In some configurations, a strap is provided for a breathing assistance apparatus interface. The strap comprises a continuous braid section wherein the continuous braid section comprises a first portion and a second portion that are at differing axial positions along the continuous braid section. The first portion being relatively more stretchable than the second portion.

In some such configurations, the continuous braid section comprises a third portion with the first portion being positioned between the second portion and the third portion and the first portion being relatively more stretchable than the third portion. In some such configurations, the first portion, the second portion and the third portion define zones to secure a beaded member.

In some configurations, a strap is provided for a breathing assistance apparatus interface. The strap is formed by at least one of weaving and braiding. The strap incorporates at least one of a thermoplastic string, a rubberized string, a silicone string and a closure structure formed during the at least one of weaving and braiding. The closure structure comprises at least one of a looped surface, a well-defined loop and a button hole.

In some configurations, a strap is provided for a breathing assistance apparatus interface. The strap is formed by at least one of weaving and braiding. The strap has a varied cross section.

In some such configurations, the varied cross section comprises a window formed during the at least one of weaving and braiding.

In some such configurations, the window can be severed to form portions of two different headgear.

In some such configurations, the strap is severed between two different windows to form two different headgear.

In some such configurations, the window is filled with a mesh material.

In some such configurations, the strap forms an entire seamless headgear unit.

In some configurations, a strap is provided for a breathing assistance apparatus interface. The strap comprises a tubular component formed by at least one of braiding and weaving with a rigid or semi-rigid component being positioned within a lumen defined by the tubular component.

In some such configurations, the rigid or semi-rigid component spans a connection between a first finger of the strap and a second finger of the strap such that the rigid or semi-rigid component spans a corner between the first finger and the second finger.

In some configurations, a strap is provided for a breathing assistance apparatus. The strap comprises a stretch increasing configuration. The stretch increasing component is configured to allow increased stretchability of the strap by severing a connection between two or more adjacent portions of the strap.

In some configurations, headgear is provided for a breathing assistance apparatus. The headgear comprises a strap and a strap adjustment mechanism.

In some such configurations, the strap adjustment mechanism comprises at least one of a tie down system and at least two structures that connect a relatively nonstretch component to a relatively stretchable component in at least two corresponding spaced apart locations, wherein at least one of the at least two corresponding spaced apart locations can be adjusted relative to the other of the two locations. In some such configurations, the strap adjustment mechanism comprises a passage through a hook, the hook being used to secure the strap to the interface. In some such configurations, the strap adjustment mechanism comprises a winding mechanism. In some such configurations, the headgear further comprises an adjustment mechanism that alters a position of a mask relative to the headgear. In some such configurations, the strap adjustment mechanism comprises at least one of a pinching lever, a loop and a post connection. In some such configurations, the strap adjustment mechanism comprises at least one scissor mechanism. In some such configurations, the strap adjustment mechanism comprises a hook member and a loop fastener member, the hook member comprising a plurality of fingers.

Certain features, aspects and advantages of specific embodiments and modifications of the present disclosure will become apparent to those skilled in the art from the detailed description herein having reference to the sheets of figures that follow.

In some of the following description, materials are formed using one or more of weaving, knitting and braiding. Weaving is interlacing, usually at right angles, of two sets of threads to form cloth, rug or other types of woven textiles. In automated processes, two distinct sets of yarns called the warp and the filling or weft are interlaced with each other to form a fabric. The lengthwise yarns that run front to back in the loom are called the warp while the yarns that extend crosswise are called the weft. Typically, the warp threads are held stationary while the weft threads are woven through them.

The yarn in knitted fabrics follows a meandering path, forming symmetric loops or stitches. When the interlocking loops run lengthwise, each row is called a wale. A wale can be compared with the warp in weaving. When the loops run across the fabric, each row is called a course. A course corresponds to the weft. There are two major varieties of knitting: weft knitting and warp knitting. In weft knitting, one continuous yarn forms courses across the fabric. In warp knitting, a series of yarns form wales in the lengthwise direction of the fabric. As used herein, knitting will typically refer to warp knitting but may refer to weft knitting in certain configurations.

In braiding, three or more strands can be interwoven to form a rope-like member. The interweaving is performed in a diagonally overlapping pattern. Braiding is done by intertwining yarns in whatever direction suited to the manufacturer's purpose. Braiding can be classified as two and three-dimensional braiding. Two-dimensional braid structure can be a circular or flat braid. They are formed by crossing a number of yarns diagonally so that each yarn passes alternately over and under one or more of the others. Three dimensional braiding is a two dimensional array of interconnected <NUM>-D circular braids. As used herein, braiding will typically refer to two-dimensional braiding but could refer to three-dimensional braiding in certain configurations.

Various head strap configurations and headgear configurations will be described. In some configurations, the headgear features upper straps, lower straps and a top strap. In some such configurations, the headgear comprises a three dimensional shape when not being worn such that the headgear does not lie flat when not being worn. The headgear can be used with a patient interface. In some such configurations, the patient interface is selected from the group consisting of full face mask, nasal mask, nasal pillows, non-invasive or a cannula. In some such configurations, the headgear and the patient interface are connected by connectors. In some such configurations, the connectors comprise clips. In some configurations, the interface comprises a delivery conduit. In some such configurations, the delivery conduit is connected to the interface with a ball joint, which may be removable. In some such configurations, the delivery conduit comprises a swivel connector. In some such configurations, the interface comprises a frame and a cushion that is removable from the frame. In some such configurations, the interface further comprises an anti-asphyxiation valve. In some such configurations, the interface further comprises bias flow holes. In some such configurations, the interface further comprises a forehead support. In some such configurations, the patient interface does not comprise a forehead support.

With reference now to <FIG>, a head strap configuration <NUM> is shown that can be formed by braiding multiple yarns together. In some embodiments, the head strap configuration <NUM> can be formed of a braid of knit components. In other words, multiple yarns can be knit together to define a knit component and then the knit component can be used to form the braid. In some embodiments, the head strap configuration <NUM> can feature a split material construction in which different yarns are used for a top portion <NUM> of the head strap configuration <NUM> and a bottom portion <NUM> of the head strap configuration <NUM>. The top portion <NUM> and the bottom portion <NUM> of the head strap configuration <NUM> can be joined in any suitable manner. For example, the two may be joined by thermal bonding, stitching, adhesive or the like.

In some configurations, the knit or braid, although mainly circular and continuous, can have very different properties for the top portion <NUM> (i.e., a portion other than the portion that will sit closest to the face and/or the portion furthest from the portion that will sit closest to the face) and the bottom portion <NUM> (i.e., the portion that will sit closest to the face). In such configurations, the yarns or materials chosen for the top and bottom surfaces or portions <NUM>, <NUM> can be chosen for desired properties. For example, in some configurations, one portion (e.g., the top portion <NUM>) may comprise a rather rigid structural side while the other portion (e.g., the bottom portion <NUM>) may comprise a soft, cushioning side with the soft side being the side that will be in contact with the skin. In some configurations, a strong, stiff yarn can be used to create structural rigidity for the head strap configuration <NUM>. In some configurations, a yarn can be used for the soft side that provides breathability and moisture absorption for the surface that will contact the skin of the user. In some configurations, such a material can include merino wool.

As illustrated, the strong, stiff side (e.g., the top portion <NUM>) can provide some structural integrity to the head strap configuration <NUM>. For example, the strong, stiff side can provide structural rigidity, which can help reduce or eliminate the likelihood of twisting and tangles in headgear, which can be formed using the head strap configuration <NUM>. Nevertheless, in the illustrated configuration, the braid resulting from the knit product would create a hollow tube that can allow some rolling of the strap relative to the user without undue slippage relative to the user, which slippage could cause chaffing over time. In other words, the head strap configuration <NUM> comprises an inner lumen <NUM>. The inner lumen <NUM> may allow relative movement between the upper portion <NUM> and the lower portion <NUM> without necessarily creating significant movement between the lower portion <NUM> and skin or hair of the user, as shown in <FIG>.

In some configurations, such as those shown in <FIG>, a structural headgear component <NUM> can be enveloped or at least partially enveloped within the lumen <NUM> of the hollow braid. For example, in the illustrated configuration, the hollow braid of the head strap configuration <NUM> would be able to roll around the structural headgear component <NUM> and provide softness or a soft hand to the structural headgear component <NUM>. In some such configurations, the hollow braid would have the same properties around the circumference of the hollow braid, which is different from the configuration discussed directly above in which an inner surface and an outer surface might have differing properties. In some configurations, however, the hollow braid also could have differing properties in different regions.

An advantage of these combined braid/knit configurations is the ability to produce the head strap during a single manufacturing process. For example, in some configurations, the knit can be built with multiple yarns and possibly very different knitting patterns for the top and the bottom half. If one of the sides is intended to be in contact with the skin, properties like breathability might be considered. One particularly interesting combination is a combination of a knit (e.g., such as the strap used with the PILAIRO interface) and a braid (e.g., a climbing rope's outer sleeve).

With reference now to <FIG>, a head strap configuration <NUM> can include a strap <NUM> that combines bands <NUM> with different properties. For example, the strap <NUM> can be knit from multiple yarns. In such configurations, bands <NUM>, <NUM> can be formed by primarily knitting and/or braiding with one of the yarns (e.g., relatively non-stretch yarn) where the other(s) (e.g., relatively stretch yarn) is just carried across to the next section where the roles are reversed.

In the illustrated configuration, a relatively stretchy material can be used for the strap <NUM> and the relatively stretchy material can be alternated with a relatively non-stretchy material for the ends <NUM>. In other words, a region <NUM> can be formed predominantly using a relatively stretchy yarn (i.e., a region knitted from the relatively stretchy yarn) and that region can be bounded by two regions <NUM> formed predominantly using a relatively less stretchy or more rigid yarn. The number, size and configuration of the bands <NUM>, <NUM> can be varied in any suitable or desired manner.

The relatively non-stretch regions <NUM> can form ends <NUM>. The relatively non-stretch ends <NUM> can improve the reliability of crimped connections <NUM>. For example, as shown in <FIG>, when clips <NUM> are crimped onto the strap <NUM> (e.g., hooks or the like), the clips <NUM> are more securely attached in regions that are generally less stretchy or that are more stable and less elastic in an axial direction.

Configurations featuring different regions or bands can provide increased reliability and can provide ease of manufacture. Accordingly, such configurations may result in less rejects during manufacturing options and also may result in less returns.

With reference now to <FIG>, which disclose an arrangement not independently claimed, the knit of a head strap <NUM> can be built using multiple yarns. In some configurations, the head strap <NUM> can be formed with alternating bands <NUM>, <NUM> of more and less elasticity. As described above, the bands <NUM>, <NUM> can be formed using yarns having differing elasticity values. For example, the bands <NUM>, <NUM> can be formed by knitting primarily with one of the yarns where the other(s) are just carried across to the next section where the roles are reversed.

As shown, the head strap <NUM> can be formed into a tubular shape that defines a lumen <NUM>. The tubular shape of the head strap <NUM> can incorporate a series of the bands <NUM>, <NUM>. As described directly above, the bands <NUM>, <NUM> can have differing elasticity. In some configurations, the bands <NUM>, <NUM> can have alternating elasticity. Such a configuration can allow a series of beads <NUM> or the like to be inserted into the lumen <NUM> defined by the tubular shaped sleeve of the head strap <NUM>. In some configurations, the beads <NUM> and the tubular shape of the head strap <NUM> can be integrated into a single component (i.e., the two can form a single component as shown in <FIG>). In some configurations, the beads <NUM> and the tubular shape of the head strap <NUM> can be separate components. The beads <NUM> can be advanced or retracted to alter a length or circumference of the strap or headgear component, for example, but without limitation. As such, the varied stretch properties in the bands <NUM>, <NUM> can be used to adjust the length of the string of beads <NUM> that can be pulled through the tubular sleeve of the head strap <NUM>, which can be formed by braiding, for example but without limitation. The relatively more stretchy bands <NUM> can expand to accommodate the beads <NUM> while the relatively less stretchy bands <NUM> can resist circumferential expansion and can act to hold the beads <NUM> in position.

The illustrated configurations can provide increased reliability and improved ease of manufacture. Accordingly, such configurations can result in less rejects and less returns.

With reference now to <FIG>, a combination of technologies can be used to modify the braid or the weave. In some configurations, such as those shown in <FIG>, a thermoplastic material can be used in the braided or woven strap <NUM>. The thermoplastic material allows deformation under heat, which allows welding, such as ultrasonic welding, calendaring, fusing, and the like. For example, additional parts can be welded on to help create at least a portion of, if not a complete, headgear assembly. In the illustrated configurations, a clip, buckle, or other mechanical components <NUM> can be secured to the strap <NUM> using welding, such as ultrasonic welding, for example, but without limitation.

In some configurations, the thermoplastic nature can be used to change properties of the strap <NUM> in specific regions (e.g., alter the elasticity). For example, in the illustrated configuration, a portion <NUM> of the strap <NUM> is shown crushed and fused, which can alter characteristics in that region of the strap <NUM>. In some configurations, such as that shown in <FIG>, calendaring can be used, for example but without limitation, to add a pattern <NUM>. In some configurations, the strap <NUM> can be branded by taking advantage of the thermoplastic characteristics.

Thus, in configurations employing thermoplastic yarn, the thermoplastic yarn can allow permanent thermoplastic, post-knitting, deformation, for example but without limitation. An advantage of such a construction is that the thermoplastic yarn can help incorporate features that would be otherwise impossible, difficult, and/or expensive to provide.

With reference to <FIG>, configurations are illustrated in which a strap <NUM> can feature a knit that is varied to create features and properties. In some configurations, tactile properties can be created or altered by adjusting or varying the knit. In some configurations, features can be created during the knitting process simply by using different knitting patterns.

As illustrated, the knitting machine can be adjusted to create a braid or a knit that incorporates desired features. For example but without limitation, in some configurations, such as that shown in <FIG>, multiple loops can be created for tactile and/or functional reasons. In the illustrated configurations, the loops can be used in conjunction with hook-style fasteners or the like. For example, in <FIG>, the loops can provide a differing tactile feel while also providing a loop segment <NUM> that can improve connection with hooks of a hook-and-loop style fastener. In some configurations, such as those shown in <FIG>, for example, well defined loops <NUM> can be used as catches for hooks on a connector member <NUM>. In other words, rather than having to attach separate catches for the hook of a clip, the well-defined loops <NUM> can be used to secure the hook of the clip <NUM>. In some configurations, such as shown in <FIG>, for example, holes <NUM> can be formed that can be used to receive buttons or posts, for example but without limitation.

An advantage of such a construction is that all of the different properties are still part of the same knit with all of the advantages of knitting. In other words, there is only one manufacturing process to create the strap and no or minimal waste is created.

With reference <FIG>, a strap or headgear component <NUM> is illustrated that has incorporated a surface texture <NUM>. The surface texture can be used to increase grip, for example but without limitation.

As illustrated, in some configurations, such as that shown in <FIG>, the knit or braid can incorporate a string <NUM>, such as a rubber string, a silicone string, or the like. Such configurations can use exposed regions of the string <NUM> to create the surface texture, which defines a high friction component, such as a pad, that can be integrated into the braid of the strap or headgear component <NUM>.

In addition to, or as an alternative to, using the multi yarn knit to create a textured surface <NUM>, other techniques also can be used. For example, in some configurations, such as those shown in <FIG>, screen printing can be used to create a textured surface <NUM>. Screen printing has the additional advantage of complete freedom in shape and size of the print. In the illustrated configurations, rubber dots can be screen printed. In some configurations, other shapes can be defined. In some configurations, other shapes can be defined by screen printing or the like. For example but without limitation, the shapes can change as desired and, in some instances, depending upon fashion desires.

In some configurations, being able to provide surface texture can facilitate better control over how certain portions of the headgear behaves or feels when disposed against the skin, for example.

With reference now to <FIG>, various configurations are shown in which headgear and head straps can be created having varied shapes, which can be desired for multiple reasons.

With reference first to <FIG>, the illustrated configurations generally involve straps <NUM> having varied cross sections. In the illustrated configurations, the headgear can be created as a continuous knitting process as described above. As illustrated, the knit can have wider regions <NUM> and narrower regions <NUM> and can be cut for finishing with appropriate or desired hooks, buckles, clips or the like. Such configurations can improve the fit, form and function of the headgear strap.

With reference to <FIG>, these configurations generally involve straps <NUM> that are a more complex knit with splits and joins. In some configurations, the knit, much like that of <FIG>, can be formed as an endless strip that can be cut later into individual straps or headgear assemblies. In the illustrated configurations, the straps <NUM> can define windows, openings or other large voids <NUM> (see <FIG>, for example) that are included within the materials of the braid and/or knit. In some configurations, the straps can be configured such that two different varieties of headgear can be formed from the same braid and/or weave (see <FIG>, for example). For example, in some configurations, a window can be formed within the braid and/or weave that can be positioned on a back of a user's head (see <FIG>) while, if split, the portions of the strap <NUM> that form the window <NUM> can be used as a forked headgear with two strap ends that connect to an interface or the like (see <FIG>). The two strap ends can receive any suitable connector, buckle, hook, clip or the like.

With reference now to <FIG>, a further configuration is illustrated that is similar in some respects to the configuration of <FIG>. In the configurations of <FIG>, the windows <NUM> discussed above can include a filling component <NUM>. In some configurations, the windows <NUM> can include a mesh material <NUM>. In some configurations, the mesh material <NUM> can be integrally formed with the straps <NUM> that generally define the windows <NUM>. In some configurations, the mesh material <NUM> can be formed separately and secured into the windows <NUM> or onto the straps <NUM> in any suitable manner. In some configurations, the headgear can be formed as a continuous strip that can be severed into multiple headgear during manufacturing.

With reference now to <FIG>, an entire, complex, headgear <NUM> can be knit in one seamless knit. In some configurations, two or more of the straps <NUM> used in the headgear <NUM> can be integrated into a single knit. In some configurations, a majority of the straps <NUM> used in the headgear <NUM> can be integrated into a single knit. In some configurations, all of the straps <NUM> used in the headgear <NUM> can be integrated into a single knit.

In some configurations, each headgear <NUM> can be knit individually. By forming the entire or the majority of the headgear <NUM> in a single knit component, very complex shapes can be obtained without undertaking labor intensive stitching or welding steps. Generally, such a seamless knit configuration is less likely to be continuous (i.e., not an endless string of headgear assemblies). In some configurations, however, the seamless knitting process can be used to form headgear <NUM> having a rather complex configurations (e.g., three separate strap components <NUM> on each side of the headgear) while still be formed in a continuous strip of headgear assemblies, as shown in <FIG>.

With reference now to <FIG>, headgear <NUM> can be created that includes one or more receiving regions, such as pockets, recesses or voids that receive and/or enclose rigid or semi-rigid inserts <NUM> to help define a resting shape of the headgear <NUM>. One or more of the inserts <NUM> can be removable from the pockets, recesses or voids. For example, the inserts <NUM> can be removed for cleaning of the headgear <NUM>. In some situations, the headgear <NUM> can be used without the inserts <NUM>. In some situations, the inserts <NUM> can have different characteristics and can be interchanged to vary one or more characteristic of the associated headgear <NUM>. Moreover, in some situations, the inserts <NUM> can be moved to different regions of the headgear <NUM>. For example, the inserts <NUM> can be moved among a set of receiving regions to alter one or more characteristic of the headgear <NUM>.

One of the difficulties sometimes encountered with more complex headgear is getting the straps into the correct location when donning the headgear. In other words, many of the current headgear configurations on the market function well when in use. However, when not in use, the numerous straps can easily become tangled and knotted, which frustrates users each time they have to put the mask back on. By utilizing straps having pre-defined resting shapes, headgear tangling can be reduced or eliminated while also creating a shape that will aid the user in understanding how best to approach wearing the headgear on their first trial.

As used herein, the rigid or semi-rigid structure <NUM> can be positioned internally or externally. In some configurations, the rigid or semi-rigid structures <NUM> can be positioned within the hollow defined by the strap (e.g., defined by the braid). The rigid or semi-rigid structures <NUM> can be secured in position using any suitable techniques. In some configurations, the rigid or semi-rigid structures <NUM> can be secured with adhesive, with stitching or with any other technique. In some configurations, the rigid or semi-rigid structures <NUM> can maintain a specific shape of the head gear when in the resting position. In some configurations, the rigid or semi-rigid components <NUM> can be applied to a single strap or multiple strap head gear arrangements.

As used herein, the resting shape is a shape that reduces or eliminates the likelihood of entanglement of the headgear when the headgear is not in use. The resting shape has an added benefit of also making it more obvious how the head gear should be put on by the user.

The rigid or semi-rigid member <NUM> can be positioned in or on any one or more of the components of the headgear. In some configurations employing multiple rigid or semi-rigid members, the multiple members <NUM> can be completely separate of each other. In some configurations employing multiple rigid or semi-rigid members <NUM>, the multiple members <NUM> can be interconnected in any suitable manner.

In some configurations, as shown in <FIG>, for example, a crown strap <NUM> of the headgear assembly can include two different rigid or semi-rigid members <NUM> that are positioned within a stretchable strap <NUM>. The strap can be stretched during donning but returns to a contracted position following doffing. In some configurations, the stretching occurs in regions separating the two or more rigid or semi-rigid members <NUM>. An example of stretching of a strap <NUM> in regions that do not including the rigid or semi-rigid member <NUM> is shown in <FIG>. In some configurations, the stretching occurs in the regions generally enveloping the rigid or semi-rigid members <NUM>. <FIG> and <FIG> do not disclose a headgear assembly as independently claimed.

In some configurations, such as those shown in <FIG>, the rigid or semi-rigid member <NUM> can have a more complex shape that connects the single rigid or semi-rigid member <NUM> with two or more strap members <NUM>. In some such configurations, the rigid or semi-rigid member <NUM> can help define a shape of the headgear <NUM> by holding two or more straps <NUM> in a desired position relative to each other. For example, in some configurations, the rigid or semi-rigid member <NUM> can be a complex spreader that holds two or straps <NUM> spread apart in a desired angular orientation. In some configurations, such as that shown in <FIG>, the rigid or semi-rigid member <NUM> can provide support to a base and back portion of the headgear assembly <NUM>. <FIG> does not disclose a headgear assembly as independently claimed. The rigid or semi-rigid members <NUM> can span the rear portion of the user's head and can wrap forward such that the straps <NUM> are presented forward to simplify donning the headgear. Other configurations are possible.

With reference now <FIG>, certain configurations of straps <NUM> can include an internal structure <NUM> that has multiple segments <NUM>. In some configurations, such as shown in <FIG>, the internal structure <NUM> can be wound or looped. In some configurations, the material for the internal structure <NUM> can be non-stretch thread (e.g., natural fiber thread (e.g., cotton or wool) or synthetic thread), a low-stretch elastic member or the like. In some configurations, the internal structure <NUM> can extend throughout the strap. In some configurations, the internal structure <NUM> can be limited to specific regions in which adjustability might be desired.

In some configurations, the structure <NUM> can be fully internal. In some configurations, such as shown in <FIG>, at least a portion of the structure <NUM> can be raised to allow severing of the strap in locations underlying the raised structure portions <NUM>. In some configurations, such as shown in <FIG> and <FIG>, the strap <NUM> can include loops <NUM> that restrain folded material until the loops <NUM> are broken or cut, for example but without limitation. As shown in <FIG>, a folded region <NUM> or the like can be provided with an extensible portion of the structure <NUM> housed within the region <NUM>. When the region <NUM> is separated from the portions of the strap <NUM> to either side, the structure <NUM> connects the portions of the strap <NUM> while facilitating expansion of the strap <NUM>. Separation can occur through cutting or axial forces applied along the length of the strap or within the segment of the strap where elongation is desired.

The segments <NUM> can be connected or connectable together. The segments <NUM> resist stretching of the straps <NUM>. Accordingly, in some configurations, at least a portion of each of the multiple segments <NUM> can be secured to at least a portion of the strap <NUM> in some suitable manner. When two adjacent segments <NUM> are separated, the strap <NUM> can be stretched in locations between the segments <NUM>. In some configurations, when the two adjacent segments <NUM> are separated, the strap <NUM> can be stretched between the location points on the strap <NUM> at which the strap <NUM> is secured to the segments <NUM>.

In some configurations, such as shown in <FIG>, the internal structure <NUM> can be snapped or broken into segments <NUM> in order to increase the stretch of the strap <NUM>. In some configurations, the internal structure <NUM> can be stitched into the head strap <NUM> and thereby limit the initial amount of stretch available. The internal structure <NUM> can include a series of sections <NUM> that, when pulled with a predetermined force or bent with a predetermined force or some combination of the two, will separate at a snap point <NUM>, for example but without limitation. In some configurations, the snap points <NUM> will snap and permanently add a small amount of stretch to the head strap <NUM>. By providing multiple snap points <NUM> across several sections of the head strap <NUM>, the strap can dramatically increase elasticity. While the illustrated configurations illustrate single straps <NUM>, the same structure also can be used in multiple strap headgear.

To assist with locating the snap points, visual snap point indicator can be used. The indicators can be graphical representations. The graphical representations can indicate to the user the areas of the head gear that are appropriate to snap.

It is believed that users prefer the simplicity of not only having a single strap head gear but also not having numerous tabs that need to be adjusted time and time again for a desired fit. This poses a challenge in how to create one single strap that fits the large variation between head circumferences of the smallest and biggest size of users. By incorporating an 'invisible' adjustment such as those described above, a greater number of users can be accommodated in a way that adds little or no additional structure, tabs or buckles.

With reference now to <FIG>, not independently claimed, a single strap head gear <NUM> is shown with a tie down and strap management system <NUM> that is arranged and configured in accordance with certain features, aspects and advantages of the present invention.

As used herein, a tie down <NUM> can be a strap management system that allows a single strap head gear <NUM> to be folded back onto itself via a loop point, buckle or the like <NUM>. As illustrated, the strap <NUM> can be folded back at a component that is integrated into the interface or mask assembly <NUM> or the strap <NUM> can be folded back at a component that is separate from or separable from the interface or mask assembly <NUM>, such as a hook, clip, connector or the like (see <FIG>, for example).

The strap <NUM> can then be locked at a specific point providing less or more length via a buckle (e.g., <FIG>) or spring loaded mechanism (e.g., <FIG>, and <FIG>). In the illustrated configurations, the buckle <NUM> and/or the spring loaded mechanism <NUM> can be provided with serrations, teeth or the like <NUM> (see <FIG>) to provide added grip on the strap <NUM>. In some configurations, as shown in <FIG>, a lever <NUM> can be used to secure the strap <NUM> in position. In some configurations, the lever <NUM> can be biased by a spring member <NUM>. In some configurations, the lever <NUM> can have a resilient configuration such that no spring member is required and the lever <NUM> is simply a cantilevered member. In some configurations, the lever <NUM> rotates about a shaft <NUM>. In some configurations, the mechanism resists movement of the strap <NUM> in a first direction but generally allows movement of the strap <NUM> in a second opposite direction.

As used herein, a loop point is a point at which the head strap <NUM> can be folded back on itself. This can be built into the mask, into the seal or and through an additional buckle or the like.

As used herein, a grip point <NUM> is a rigid and/or semi-rigid material that is placed on the strap <NUM> to facilitate gripping during adjustment of the strap <NUM>.

As illustrated in <FIG>, the length of the strap <NUM> that is positioned between a slider <NUM> and the loop point can be adjustable. The slider <NUM> can move along the strap <NUM>. In the illustrated configuration, the slider <NUM> can be in contact with two overlapping segments of the strap <NUM>. The slider <NUM> can have any suitable configuration. As shown in <FIG>, the illustrated slider <NUM> has a central member <NUM> that depresses a portion of the strap <NUM> and effectively locks the slider <NUM> in position along the strap <NUM>.

By utilizing a tie down system, users are free to tweak their initial set up as and when desired at any future date. Accordingly, if the users face shape changes or the elasticity of the strap weakens over years of use, there is still a suitable adjustment method to account for this.

With reference now to <FIG>, a strap <NUM> is illustrated that can incorporate an elastic head strap <NUM> that uses buckles <NUM>. In the illustrated configurations, two or more buckles <NUM> and a relatively non-stretch component <NUM> can be used to adjust the degree of stretch that can be provided along a length of a strap <NUM>. <FIG> and <FIG> do not disclose a headgear assembly as independently claimed.

In some configurations, such as illustrated in <FIG>, the non-stretch component <NUM> can be a relatively (relative to the strap) non-stretch sleeve. The non-stretch sleeve has a length that is less than the stretch component (e.g., elastic strap). As used herein, a non-stretch sleeve can be either an external sleeve (<FIG>) or an internal structure that has non-stretch properties (<FIG>) and that is used in conjunction with a stretchable head strap <NUM>.

In the illustrated configurations, one or more buckles, clips or the like <NUM> can be used to increase or decrease the ability of the strap <NUM> to stretch. In some configurations, two small buckles <NUM> can be used to limit the amount of elastic deformation of the strap <NUM> available to the user. Such configurations allow the users to quickly and easily fine tune the forces that they experience when using the headgear <NUM>. In other words, the user is able to use the buckles, clips or the like <NUM>, to couple the relatively more stretchable portion to the relatively less stretchable portion in various locations. This allows the relatively less stretchable portion to resist stretching of the relatively more stretchable portion between the two buckles, clips or the like <NUM>. In other words, as shown in <FIG>, moving together two clips <NUM> that lock or otherwise secure together the relatively less stretchable component and the relatively more stretchable component will increase the length of relatively more stretchable strap <NUM> available for stretching, which can increase the overall amount of stretch available to the user.

The buckles and clips can have any suitable configuration. In some configurations, the clips <NUM> can be generally clam-shell in configuration. In some such configurations, such as shown in <FIG>, the clips <NUM> can fold closed and lock in a closed position. In some such configurations, the clips <NUM> can include serrations or the like <NUM> to define teeth or the like to help secure the clips <NUM> in position and to help hold the relatively non-stretch component to the relatively stretch component. In some configurations, the clip <NUM> can include a member that slides along a slot defined within the relatively non-stretch component <NUM>. In some configurations, such as shown in <FIG>, the clip <NUM> can include a protruding component <NUM> that extends inwardly through the slot and engages against the relatively stretchable component <NUM> to lock the relatively non-stretch component <NUM> and the stretch component <NUM> together. In some configurations, such as that shown in <FIG>, the protruding component <NUM> extends fully across an opening defined by the clip <NUM>. In some configurations, such as that shown in <FIG>, the protruding component <NUM> extends only partially across the opening such that the clip <NUM> can be installed onto a strap <NUM> without having access to any end of the strap <NUM>. In some configurations and as shown in <FIG>, the illustrated configurations can be used in a tie-down arrangement or in conjunction with a tie-down arrangement such as those described above.

With reference now to <FIG>, a stretch limiting system <NUM> is illustrated that incorporates an elastic head strap using limiters, such as push buttons, domes or the like, to limit stretch of the strap.

In the illustrated configurations, a generally non-stretch sleeve <NUM> can be used to limit the stretch of the relatively more stretchable strap. The sleeve <NUM> can be an external sleeve or an internal structure that can be used in conjunction with a relatively stretchable head strap. In some configurations, the sleeve <NUM> can be an external sleeve that is formed in two or more separable pieces, such as that shown in <FIG>. In some configurations, the sleeve <NUM> can be formed of two or more separable pieces that can snapped or clipped together, such as that shown in <FIG>, for example.

In some configurations, push buttons, domes or the like <NUM> can be positioned at predetermined spacing along the non-stretch sleeve <NUM>. An example of a configuration of a push button <NUM> is shown in <FIG>. As illustrated, there is a base portion <NUM> and a head portion <NUM>. The base portion <NUM> has a flange and the head portion <NUM> has a flange. When engaged, the flanges interlock the base portion <NUM> and the head portion <NUM> together. Locking these buttons in specified patterns can increase or decrease the stretching capabilities of the strap and therefore create varying sizes for each user.

In some configurations, such as that shown in <FIG>, the strap <NUM> can include predetermined holes <NUM> or hole spacing. In some configurations, the holes <NUM> of the stretch limiting system <NUM> are oversized such that material of the strap <NUM> can be displaced into the holes of the stretch limiting system <NUM> and secured therein by the button, dome or the like <NUM>. As described above, the further away from each other the outermost push buttons, domes or the like <NUM> are that interlock the relatively non-stretch sleeve <NUM> and the relatively stretchable strap <NUM>, the less of the relatively stretchable strap <NUM> is available to stretch.

In some configurations, adjacent members, such as adjacent buttons, domes or the like <NUM> can be connected by an internal lever release system, such as that shown in <FIG>. In such configurations, pressing on a first member <NUM> can cause movement of two adjacent members <NUM>. The interconnecting levers can pivot about a hinge point, a fulcrum or the like <NUM>.

In some configurations, the use of removable buckles, clips, or the like poses problems, such as being bulky, being additional components, and being components that can be broken or lost by the user. Accordingly, incorporating the dome, push buttons, and the like directly into the head gear can be used to remove one or more of these concerns. Built-in buttons also easily can be hidden and/or accounted for in the shaping of the head gear. In other words, the integrated buttons, domes or the like could be recessed in a way that would reduce or eliminate the likelihood of discomfort to the user during use (e.g., when laying on a pillow with the strap between the head and the pillow). In some configurations, the relatively non-stretch sleeve can be secured to the relatively stretchable strap in one or more locations. In some such configurations, the amount of control the relatively stretchable strap will be proportional to the distance from the connection point to the last available button, dome or the like.

With reference now to <FIG>, a strap and clip configuration <NUM> is illustrated that accommodates one-time set up of a strap <NUM> for a headgear assembly. <FIG> do not disclose a headgear assembly as independently claimed.

As illustrated, a connector, such as a buckle or clip, <NUM> can be configured to attach to a strap <NUM>. The clip or buckle <NUM> can include a passage through which the strap <NUM> can be threaded. With reference to <FIG>, the clip or buckle <NUM> also can include a locking member <NUM> that can allow the strap to be secured in position. For example, when positioned as shown in <FIG>, the strap <NUM> can be moved through the clip or buckle <NUM>. When the locking member <NUM> is positioned as shown in <FIG>, the strap <NUM> can be locked in position relative to the clip or buckle <NUM>. In some configurations, the strap <NUM> can be locked at a specific position permanently.

In some configurations, the head strap <NUM> comprises a single strap. In some configurations, the single strap <NUM> initially can be provided with excess length to allow the user to feed it through the buckle or clip <NUM> to a desired length. Once positioned as desired, the user can cut away the excess, such as with a pair of scissors for example but without limitation. Such a configuration has been illustrated in <FIG>.

In the some configurations, a living hinge <NUM> (see <FIG>) can be provided between a first portion <NUM> and a second portion <NUM> of the clip or buckle <NUM>. The strap <NUM> can be positioned between the two portions <NUM>, <NUM> and the two portions can be secured together. With the strap <NUM> positioned as desired and the two portions <NUM>, <NUM> locked together, the excess strap can be removed.

In some configurations, the first portion <NUM> and the second portion <NUM> can be secured together but the strap <NUM> can continue to be adjusted. In some configurations, a locking mechanism <NUM>, such as that described above, can be provided as a part of the buckle or clip <NUM>. In some configurations, the locking mechanism <NUM> can include a push-button that can lock the buckle or clip <NUM> in position along the strap <NUM>. In some configurations, the clip or buckle <NUM> can include a hinge system <NUM>, such as that illustrated in <FIG>. In some configurations, the hinge system <NUM> can lock onto the strap <NUM> through a pivoting action. In some configurations, the hinge system <NUM> allows that strap <NUM> to be thread through the buckle or clip <NUM> and exposed at a right angle such that the strap <NUM> can be more easily trimmed.

By adding in a mechanism that initially allows for excess headgear to be provided and cut away by the user, the aesthetic or function of the single strap head gear can be better maintained while providing adjustability. Further, headgear incorporating one-time setup features may be useful in single-use applications, such as hospital patient treatment, where a single size of headgear may be stocked and fit to patients.

With reference now to <FIG>, some screw adjustment mechanisms <NUM> are illustrated that can be used to adjust one or both of the headgear <NUM> and the mask seal <NUM>.

As used herein, a screw adjustment mechanism <NUM> can be a mechanism that is positioned at a specific point either on the mask frame <NUM> or on the seal component <NUM> and that rotates around a central axis to result in adjustments to the fit of the headgear <NUM> and/or seal <NUM>. In the illustrated configurations, the screw adjustment mechanism <NUM> may be spring loaded to allow quick and easy retracting/extending of the head strap <NUM>. In some configurations, the screw adjustment mechanism <NUM> could be positioned at one or more adjustment points.

As used herein, a head strap <NUM> is a single or multiple strap head gear that is attached at specific points on the screw mechanism <NUM>. As the screw mechanism <NUM> is turned by the user, the screw mechanism <NUM> can wind or unwind the head strap <NUM>, thereby varying the size of the headgear assembly depending on the user's needs. As shown in <FIG>, in some configurations, the screw mechanism <NUM> can be turned to expand the head strap length and the strap <NUM> can be pulled to extract the additional length as desired. <FIG> does not disclose a headgear assembly as independently claimed. In some configurations, a single screw mechanism <NUM> can be provided (see, e.g., <FIG>). In some configurations, multiple screw mechanisms <NUM> can be provided (see, e.g., <FIG>). In some configurations, the screw mechanism <NUM> can be provided on each side of the interface.

In some configurations, the screw mechanism <NUM> provides a mechanical solution to the adjustability of the single strap head gear <NUM>. In some configurations, a large dial <NUM> (see <FIG>, e.g.) can be provided directly in front or to the side of the face. The dial <NUM> can allow users of all capability levels to easily be able to adjust the head strap to a desired size. For example, the dial <NUM> can be twisted to expand or contract the length of the head strap <NUM>.

With reference to <FIG>, in some configurations, a spring-loaded mechanism <NUM> can be provided. The spring-loaded mechanism <NUM> can have any suitable configuration. In some configurations, the spring-loaded mechanism <NUM> can allow the screw mechanism <NUM> to self-adjust by simply being over-stretched and the spring <NUM> allowed to then retract the strap <NUM> into position around the users head. In some configurations, the strap <NUM> can lock at certain points and can return to a retracted position upon over extension. Other configurations also can be provided.

With reference now to <FIG>, a rack and pinion system <NUM> can be provided to adjust the fit of the strap <NUM> and/or headgear. In some configurations, the ends of the strap <NUM> can be provided with a rack configuration (e.g., teeth) <NUM>. In some configurations, at least one end of the strap <NUM> can be secured to a member that includes teeth and that can serve the function of a rack. In some configurations, a knob <NUM> or the like can be provided with teeth that can interlock with the teeth of the rack <NUM>. By rotating the knob <NUM>, the length of the strap <NUM> can be adjusted.

In some configurations, rather than an actual rack and pinion system <NUM> that incorporates meshing teeth, a similar function can be provided through a cord or wire winding mechanism <NUM>. Such a configuration is shown in <FIG>. A hook <NUM> can be positioned on one or more end of the strap <NUM>. As the knob <NUM> is turned, the length of a cord, wire or the like <NUM> can be adjusted and the hook <NUM> causes the adjustment to be transferred, at least in part, to the headgear <NUM>. Other arrangements can be used to secure the headgear <NUM> to the cord, wire or the like <NUM>.

Furthermore, in some configurations, assemblies <NUM> can be provided that translate between vertical movement and horizontal movement or between pivotal movement and axial movement of the headgear <NUM>. In other words, in some configurations, a pivotal movement of a component to which the headgear is attachable can result in an adjustment of the length of the combined headgear and the component. Similarly, in some configurations, movement of one or more component toward each other can result in retraction and extension of the attached headgear. Two such configurations are illustrated in <FIG>. In <FIG>, one or more pivoting elements <NUM> control relative movement between two elements that are connected to the headgear. In <FIG>, two elements <NUM> that move toward and away from each other can cause relative movement between two elements that are connected to the headgear. <FIG> do not disclose a headgear assembly as independently claimed.

With reference now to <FIG>, an assembly <NUM> is provided that can cause movement of a mask seal <NUM> relative to a mask frame <NUM>, or relative to a headgear assembly <NUM>, for example but without limitation.

As used herein, a bridge or a bracket <NUM> can be a component that creates a predetermined, consistent distance between the users face and the mask/seal <NUM>/<NUM>. The Archimedes screw <NUM> can be attached to the bracket <NUM> to provide an adjustment point between the bracket <NUM> and the mask seal <NUM>, as shown in <FIG>. Advancing and retracting the screw mechanism <NUM> directly increases and decreases the force at which the mask seal <NUM> is pressing against the users face. The adjustment point can be a ring <NUM> that is attached to the Archimedes screw <NUM>. The ring <NUM>, when rotated, can advance and retract the screw mechanism or assembly <NUM>.

Accordingly, because interface designs are designed for the masses, the Archimedes screw mechanism or assembly <NUM> can allow fine-tuning of the fit of the interface designs. Thus, more control can be provided for users to adjust the device to better suit their needs or desires.

With reference now to <FIG>, a further strap adjustment assembly <NUM> is shown. In the illustrated configuration, the strap length can be adjusted by creating a loop with the headgear and then using a suitable assembly to adjust the length of the head strap. <FIG> do not disclose a headgear assembly as independently claimed.

In some configurations, a bracket <NUM> can be formed that is attached to the interface or mask assembly while a locking member <NUM> can be connected to at least one end of the strap <NUM>. The bracket <NUM> can include a plurality of connecting points <NUM> and the locking member <NUM> can connect at each of the connecting points <NUM>; depending upon selected connecting point <NUM>, the length of the strap <NUM> can be adjusted. In such a configuration, a <NUM>:<NUM> adjustment between the strap length and the positioning on the mask frame can result.

In some configurations, such as that shown in <FIG>, a multiplier <NUM>, such as a pulley, turnbuckle or the like, can be positioned along the strap <NUM> between the ends. In some configurations, such as that shown in <FIG>, the end connectors for the strap <NUM> can have a multiplier <NUM> in the form of a hinged structure (e.g., a watch band) with the end being adjustable to adjust the length. As shown in <FIG>, the hinged structure <NUM> can be folded into a receptacle formed in the bracket <NUM>. In such configurations, the hinged structure <NUM> can be secured into one or more of the connecting points <NUM> of the bracket <NUM>. Thus, in such configurations, a smaller adjustment at the frame region can result in a larger adjustment to the headgear strap (e.g., <NUM>:<NUM>).

With reference to <FIG>, a strap <NUM> can include a small loop <NUM> formed at the end. In some configurations, the loop <NUM> can be secured to the strap end <NUM> with a small fitting <NUM>. In some configurations, the loop <NUM> and strap end fitting <NUM> approximate a camera strap.

The mask frame or interface assembly <NUM> can include a member with a plurality of hooks <NUM>. The loop <NUM> can be passed over any of the hooks <NUM> as desired to provide different levels of adjustment. In some configurations, the hooks <NUM> are formed on an inside of the mask. In such configurations, the hooks <NUM> and adjustment features are obscured from view, thereby creating a clean look while facilitating an adjustable configuration.

With reference too <FIG>, the strap length can be adjusted using an over-center pinch assembly <NUM>. The figures illustrate a series of mechanisms based on changing the effective length of a strap <NUM> by forming a sub-loop <NUM> and fixing its position with a clamp <NUM>. <FIG> illustrates a simple folded over strap with an over-center pinch clip used to secure the length of the strap <NUM>. The strap is secured to the clamp <NUM> at a fixing location <NUM> <FIG> illustrates a construction that is similar to that shown in <FIG> but the configuration of <FIG> includes a multiplier such that a <NUM>:<NUM> adjustment ratio results. In <FIG>, the strap <NUM> is secured to the mask frame <NUM> or the like at a fixing location <NUM>. Other configurations also are possible. <FIG> does not disclose a headgear assembly as independently claimed.

<FIG> illustrate a continuous loop headgear <NUM>. To adjust the effective length of the headgear, a sub loop <NUM> is formed and folds back on itself. The position can be fixed with any suitable clamp <NUM>, for example. In some configurations, the clamp <NUM> can be an over center clamp. <FIG> illustrate the effect of using various sizes of sub loops <NUM> on the overall headgear size.

With reference now to <FIG>, a scissor link system <NUM> is illustrated. The scissor link system <NUM> can comprising a plurality of matched sets of pivoting arms <NUM>. Both of the arms of each set can be linked together and each of the sets can be linked together. Other configurations are possible.

The scissor link system <NUM> allows varying degrees of adjustability based on whether the links have been expanded or contracted, as illustrated in <FIG>. It is envisaged that this could be a large mechanical type mechanism, or could be scaled down much further to the point where the device functions the same but may not be apparent to the naked eye how this works.

In some configurations, the scissor link system <NUM> includes an adjustment mechanism <NUM>, as shown in <FIG>. The adjustment mechanism <NUM> can include a button or a glider that, when adjusted, will directly affect the level of compression or extension in the scissor link system <NUM>. Because of the mechanical nature of the adjustment, there is much greater control over the amount of adjustment, the ease of adjustment and the strength of materials compared to the configurations discussed above.

In some configurations, the adjustment mechanism <NUM> and the scissor link system <NUM> is configured such that each of the scissor arms will experience a generally equal adjustment throughout the assembly <NUM>. In some configurations, however, different sections of the assembly <NUM> can be adjusted with different degrees of expansion or compression. For example, as shown in <FIG>, one end may remain generally compressed while the other end may be more fully expanded.

In some configurations, such as that shown in <FIG>, the scissor link system <NUM> can include a member <NUM> that allows for the adjustment to be locked. In some configurations, the adjustment member (or locking member) <NUM> can be positioned at each end of the scissors mechanism (e.g., <FIG>). In some configurations, the adjustment member (or locking member) <NUM> can be positioned at only one end (e.g., <FIG>). In some configurations, the adjustment member (or locking member) can be used to adjust one linkage, which can result in adjustment to the rest of the linkages. In some configurations, the adjustment member (or locking member) can be a push-button or the like. Other configurations are possible.

With reference now to <FIG>, several additional scissor link systems <NUM> are shown. The illustrated configurations provide for more finely tuned adjustments.

As described above, a scissor link system <NUM> allows varying degrees of adjustability based on whether the links <NUM> have been expanded or contracted. In some configurations, one or more of the links <NUM> can be biased using a spring <NUM> or another suitable biasing member. In some such configurations, an extension spring <NUM> can apply a force (e.g., a constant force) on the scissor links <NUM> in order retract the links <NUM> as and when required or desired by the user.

In some configurations, a threaded member <NUM> can be used in order to expand or contract the links <NUM> via the twist knob or push button <NUM>. In such configurations, for example, a bracket <NUM> can be used to maintain a distance between the threaded member <NUM>, the associated link <NUM> and one or more tracks <NUM>. As used herein, tracks <NUM> can be slots, grooves, protrusions or that like that can be formed on or the scissor links <NUM>, which, in combination with the bracket <NUM> and threaded member <NUM>, allow the links <NUM> to smoothly retract and expand. In some configurations, movement of the threaded member <NUM> can be directed using a twist knob <NUM> or the like. For example, in some configurations, the knob <NUM> or button can be used to twist, push or pull the threaded member <NUM> forward and backward, which results in the scissor links <NUM> expanding and retracting. Other suitable configurations also can be used. For example, in some configurations, such as that illustrated in <FIG>, an external thread <NUM> can generally enclose two of the links <NUM> or the links <NUM> can have a threaded surface <NUM>. In such configurations, turning the knob <NUM> causes the knob <NUM> to advance along the links <NUM> and to compress the links <NUM> toward each other (because the internally threaded portion of the knob <NUM> does not change sizes).

The illustrated configurations provide greater control over the level of adjustment to the headgear via the scissor link system <NUM>. In some configurations, a visual indicator can be provided showing a specific setting (e.g., <NUM>-<NUM>). The visual indicator would allow users to quickly and easily set up the head gear after cleaning and/or would allow users to match existing settings when they replace the head gear in the future.

With reference now to <FIG>, an arrangement featuring a hook and loop fastener based limiting/locking system <NUM> is illustrated. As used herein, a hook tab <NUM> is a tab specifically designed to increase the difficulty of removing the strap <NUM> in question. This system <NUM> provides adjustment to users who are trained in its use and makes it more difficult for users who are not. As used herein, a loop head strap <NUM> means a loop material for the hook <NUM> to grab onto and lock in place.

In some headgear configurations, the headgear can require a one-time set up by a sleep tech or other experienced person. Following the one-time set up, it is intended that such headgear not be readjusted by the user. The one-time set up poses a problem in how to create a method of adjustment that can be adjusted by one person but not another. By utilizing a more complex adjustment method such as the hook tab <NUM> proposed, trained/experienced users will easily be able to make the adjustment, while the difficulty in doing so for others not trained will deter them from using it and instead direct them to use other adjustment methods provided.

In some configurations, the hook tab <NUM> comprises a forked configuration with at least one recessed region <NUM>. In some such configurations, the hook tab <NUM> comprises a plurality of fingers <NUM>. The plurality of fingers <NUM> need to be raised simultaneously in order to release the hook tab <NUM> from the underlying loop material of the strap <NUM>, for example but without limitation. A variety of tab configurations are illustrated in <FIG>. In many of the configurations, one or more of the fingers <NUM> extends further along the strap <NUM> than others of the fingers. In some of the configurations, one or more of the fingers <NUM> is at least partially circumscribed by another of the fingers <NUM>. In some of the configurations, one or more of the fingers <NUM> is fully circumscribed by another of the fingers <NUM>. In some configurations, for example, <FIG>, the fingers are not circumscribed but, rather, the hook tab <NUM> comprises a wide free end <NUM> connected to a second portion <NUM> via a narrow section <NUM> with the fingers <NUM> being located on one or both sides of the narrow section <NUM> having fingers <NUM> on either or each side.

Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like, are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense, that is to say, in the sense of "including, but not limited to.

The invention may also be said broadly to consist in the parts, elements and features referred to or indicated in the specification of the application, individually or collectively, in any or all combinations of two or more of said parts, elements or features.

Certain features, aspects and advantages of some configurations of the present disclosure have been described with reference to use by a patient or user. However, certain features, aspects and advantages of the use of the headgear and/or straps as described may be advantageously practiced by other people on behalf of the patient, including medical professionals, medical device dealers, or medical device providers. Certain features, aspects and advantages of the methods and apparatus of the present disclosure may be equally applied to usage by other people.

Claim 1:
A headgear assembly for use with a patient interface, the headgear assembly comprising:
at least one strap (<NUM>), the at least one strap comprising an end with a hook tab,
the hook tab (<NUM>) being securable to a loop material of the strap, characterised in that,
the hook tab comprises at least two fingers (<NUM>) that are spaced apart from each other by a gap such that lifting one of the at least two fingers will not result in lifting of the other of the at least two fingers.