Headgear with unlocking mechanism

Abstract

To provide a breathing mask system having a breathing mask and a head engagement part.SOLUTION: Provided is a breathing mask system having a breathing mask and a head engagement part. The head engagement part is coupled to the breathing mask so as to engage with a head of a wearer via a releasable mechanism. The releasable mechanism includes: a coupling member attached to the head engagement part; a release member attached to the breathing mask and configured to receive the coupling member, the release member being configured to be movable between a first position and a second position; a control part configured to allow a mask wearer to move the release member toward the first position; and one or a plurality of surface(s) defined by the release member and configured to apply a friction force to the coupling member.SELECTED DRAWING: Figure 28

Description

[Technical Field]

[0001] The present disclosure relates to respiratory therapy systems, and more particularly to interface assemblies and portions thereof used in respiratory therapy. [Background technology]

[0002] Masks that provide a substantially airtight seal with the wearer are used in a variety of applications (e.g., gas masks, diving masks, respiratory therapy masks), etc. Some of these masks use headgear that includes one or more straps to secure the mask to the wearer's face.

[0003] Respiratory masks are used to provide respiratory therapy to the airways of individuals suffering from any of a number of respiratory diseases or conditions, including, but not limited to, continuous positive airway pressure (CPAP) therapy and non-invasive ventilation (NIV) therapy.

[0004] CPAP therapy can be used to treat obstructive sleep apnea (OSA), a condition in which a patient's airway becomes intermittently blocked during sleep, preventing the patient from breathing for periods of time. The cessation of breathing, or apnea, can awaken the patient. Repetitive and frequent apneas can result in patients rarely getting a full, restorative night's sleep.

[0005] CPAP therapy involves delivering a supply of continuous positive air pressure to a patient's airway via a breathing mask, which acts as a splint within the patient's airway, holding the airway in a patent position so that the patient's breathing and sleep are uninterrupted.

[0006] Respiratory masks typically include a patient interface and headgear, where the patient interface is configured to deliver a supply of continuous positive air pressure to the patient's airway via a seal or cushion that forms an airtight seal in or around the patient's nose and / or mouth. Respiratory masks are available in a variety of styles, including full-face, nasal, and direct nose and mouth masks, and form an airtight seal with the nose and / or mouth. The seal or cushion is held in place on the patient's face by the headgear. To maintain the airtight seal, the headgear must provide support for the patient interface so that it is held in a stable position against the patient's face during use. Such respiratory masks can also be used to deliver NIV and other therapies. Summary of the Invention [Means for solving the problem]

[0007] The systems, methods, and apparatus described herein have innovative aspects, none of which is essential or solely responsible for their desirable attributes. Without limiting the scope of the claims, some of the advantageous features will now be outlined.

[0008] In some configurations, the respiratory mask headgear comprises at least one strap comprising a filament, a directional lock having an engaged configuration and a disengaged configuration with respect to the filament, and a release member operable to hold the lock in the disengaged configuration.

[0009] In some configurations, the headgear further comprises an actuator configured to act on the release member to cause the release member to hold the lock in the released configuration.

[0010] In some arrangements, the actuator is selectively operable to act on the release member, hi some such arrangements, the actuator is coupled to one of a movable bar or a button or a handle.

[0011] In some configurations, the actuator is configured to automatically act on the release member when a user pulls the mask away from the user's face. In some such configurations, the actuator comprises an arm coupled to at least one strap and configured to be movable relative to the respirator.

[0012] In some configurations, the release member is normally biased so as not to hold the lock in its released configuration.

[0013] In some configurations, the at least one strap comprises a first strap portion and a second strap portion, the filament being attached to one of the first strap portion and the second strap portion, and the first strap portion and the second strap portion being movable relative to one another to change the length of the at least one strap.

[0014] In some configurations, at least one strap extends between the head-engaging portion and the mask-engaging portion of the headgear.

[0015] In some configurations, the respiratory mask headgear comprises at least one strap comprising a filament, a directional lock configured to restrict movement of the filament in a direction until a minimum force in that direction is applied to the filament, and a release member operable to reduce the minimum force required to move the filament in that direction.

[0016] In some configurations, the release member is normally biased away from the position where the minimum force is reduced.

[0017] In some configurations, the minimum force of a directional lock is about 2 Newtons to 8 Newtons. In some configurations, two or more directional locks with minimum forces of 2 Newtons to 8 Newtons can be combined to provide an overall minimum force of 4 to 16 Newtons or 16 to 32 Newtons.

[0018] In some configurations, the minimum force of a directional lock is about 4 Newtons to 6 Newtons. In some configurations, two or more directional locks with a minimum force of 4 Newtons to 6 Newtons can be combined to provide an overall minimum force of 8 to 12 Newtons or 16 to 32 Newtons.

[0019] In some configurations, the headgear further comprises at least one strap that does not include a filament.

[0020] In some configurations, the headgear further comprises an actuator configured to operate the release member.

[0021] In some configurations, the actuator is selectively operable to act on the release member, hi some such configurations, the actuator is coupled to one of a movable bar, a button, or a handle.

[0022] In some configurations, the actuator is configured to automatically act on the release member when a user pulls the mask away from the user's face. In some such configurations, the actuator comprises an arm coupled to at least one strap and configured to be movable relative to the respirator.

[0023] In some configurations, a mask assembly includes any of the headgear described above. The mask assembly further includes a mask. The mask includes a frame and a cushion module having a housing and a seal. The mask further includes a connection arrangement configured to connect the cushion module to the frame. The connection arrangement includes at least one protrusion located on one of the cushion module and the frame and at least one recess located on the other of the cushion module and the frame. The at least one protrusion is configured to engage with the at least one recess to secure the cushion module to the frame.

[0024] In some configurations, the cushion module includes a cylindrical wall that defines an opening that receives the collar of the frame.

[0025] In some configurations, the at least one protrusion extends circumferentially on the cylindrical wall and the at least one recess extends circumferentially on the collar.

[0026] In some configurations, the cylindrical wall extends from the outer wall of the housing into the breathing chamber of the cushion module.

[0027] In some configurations, the alignment feature includes a recess defined by one of the cushion module and the frame and a protrusion defined by the other of the cushion module and the frame, the protrusion configured to engage the recess to facilitate rotational alignment of the cushion module relative to the frame.

[0028] In some configurations, the headgear comprises a yoke configured to connect the headgear to the mask.

[0029] In some configurations, the yoke comprises a central portion and at least one arm extending from the central portion, the at least one arm configured to connect to at least one strap of the headgear.

[0030] In some configurations, the frame includes a lip and the yoke includes at least one hook-like connecting finger configured to selectively engage the lip to secure the yoke to the frame.

[0031] In some configurations, the lip extends around the periphery of the frame.

[0032] In some configurations, the lip extends from the front of the frame.

[0033] In some configurations, at least one hook-like connecting finger is located adjacent the junction of at least one arm and the central portion.

[0034] In some configurations, a recess is located adjacent to the at least one hook-shaped connection finger and is configured to facilitate deflection of the at least one hook-shaped connection finger.

[0035] In some configurations, a gap is located adjacent to the at least one hook-shaped connection finger and is configured to facilitate deflection of the at least one hook-shaped connection finger and / or to decouple movement of the at least one arm and the at least one hook-shaped connection finger.

[0036] In some configurations, the gap extends completely through the rear wall of the yoke.

[0037] In some configurations, the at least one strap includes multiple straps and the at least one arm includes multiple arms.

[0038] In some configurations, the number of straps is different from the number of arms.

[0039] In some configurations, the mask assembly includes a cushion module having a housing, a seal for sealing with the patient's face, an inlet opening to the cushion module, and a plurality of exhaust holes located in the housing above the inlet opening. The mask assembly also includes a frame having at least one protrusion that engages with the inlet opening of the cushion module to attach the frame to the cushion module. The frame has a conduit connector portion that connects to a conduit through which breathing gas is delivered. The conduit connector portion extends below the inlet opening when the frame is attached to the cushion module. A yoke is configured to be attached to the frame. The yoke has a central portion that is substantially aligned with the inlet opening of the cushion module when the yoke is attached to the frame, and arms that extend laterally from the central portion.

[0040] In some configurations, the entire central portion of the yoke is located below the plurality of exhaust holes when the yoke and cushion module are attached to the frame.

[0041] In some configurations, the entire yoke is located below the top height of the plurality of exhaust holes when the yoke and cushion module are attached to the frame.

[0042] In some configurations, the maximum width of the frame is less than or equal to the maximum width of the central portion of the yoke.

[0043] In some configurations, the frame includes a lip and the yoke includes at least one hook-like connecting finger configured to selectively engage the lip to secure the yoke to the frame.

[0044] In some configurations, the lip extends around the periphery of the frame.

[0045] In some configurations, the lip extends from the front of the frame.

[0046] In some configurations, the at least one hook-like connecting finger comprises a hook-like connecting finger located adjacent a junction of each of the arms with the central portion.

[0047] In some configurations, a recess is located adjacent to the at least one hook-shaped connection finger and is configured to facilitate deflection of the at least one hook-shaped connection finger.

[0048] In some configurations, a gap is located adjacent each of the hook-shaped connection fingers and is configured to facilitate deflection of the associated hook-shaped connection finger and / or to decouple movement of each of the arms from the associated hook-shaped connection finger.

[0049] In some configurations, the gap extends completely through the rear wall of the yoke.

[0050] Reference numbers may be reused throughout the drawings to indicate general correspondence between referenced elements. The drawings are provided to illustrate example embodiments described herein and are not intended to limit the scope of the present disclosure. [Brief explanation of the drawings]

[0051] [Figure 1] FIG. 1 is a perspective view of a mask assembly including a headgear assembly, a seal assembly, and a frame assembly. [Figure 2] FIG. 2 is a front view of the mask assembly of FIG. 1. [Figure 3] FIG. 2 is a side view of the mask assembly of FIG. 1. [Figure 4] FIG. 2 is a rear perspective view of the mask assembly of FIG. 1. [Figure 5] FIG. 1 is an exploded view of the seal assembly, frame assembly, and front portion of the headgear assembly. [Figure 6] FIG. 1 is an exploded view of one form of headgear assembly. [Figure 7] FIG. 12 is a front view of an example embodiment of an assembled frame, cushion, and yoke. [Figure 8] FIG. 8 is a partial perspective view of the yoke of FIG. 7 separated from the frame. [Figure 9] 9 is a cross-sectional view of the assembled frame and yoke taken along line 9-9 of FIG. 7. [Figure 10A] FIG. 8 is a rear view of the rear portion of the yoke of FIG. 7. [Figure 10B] FIG. 10B is a front view of the rear portion of the yoke of FIG. 10A. [Figure 10C] FIG. 8 is a rear view of the front portion of the yoke of FIG. 7. [Figure 11] 11 is a cross-sectional view of the assembled frame and yoke of FIG. 7 taken along line 11-11 of FIG. 7. [Figure 12] 12 is a cross-sectional view of the assembled frame and yoke of FIG. 7 taken along line 12-12 of FIG. 7. [Figure 13] FIG. 8 is a cross-sectional view of the cushion of FIG. 7. [Figure 14] FIG. 10 is a partial cross-sectional view of an alternative embodiment of a yoke showing components of the headgear adjustment mechanism. [Figure 15] 10 shows how to bond end caps onto the ends of the yoke. [Figure 16] FIG. 16 is a partial rear perspective view of the assembled end cap and yoke of FIG. 15. [Figure 17] FIG. 8 is an end view of the yoke end of the yoke of FIG. 7. [Figure 18] FIG. 18 is a top view of the yoke end of FIG. 17. [Figure 19] 19 is a cross-sectional view of an end cap coupled to a yoke end taken along line 19-19 of FIG. 17. [Figure 20] FIG. 20 is a cross-sectional view of the end cap of FIG. 19. [Figure 21] FIG. 20 is a rear view of the yoke of FIG. 7 and FIGS. 15 to 19. [Figure 22] FIG. 10 is a front view of an alternative embodiment of the rear of the yoke. [Figure 23] FIG. 23 is a rear view of an alternative embodiment of a front yoke configured to be coupled to the rear yoke of FIG. 22. [Figure 24]24 is a cross-sectional view of the rear yoke of FIG. 22 and the front yoke of FIG. 23 assembled together along line 24-24 of FIG. 21. [Figure 25A] FIG. 10 is a cross-sectional view of the directional lock in the locked position. [Figure 25B] FIG. 25B is a perspective cross-sectional view of the directional lock of FIG. 25A in a locked position. [Figure 25C] FIG. 25B is a cross-sectional view of the directional lock of FIG. 25A in an unlocked position. [Figure 25D] FIG. 25B is a perspective cross-sectional view of the directional lock of FIG. 25A in an unlocked position. [Figure 26] FIG. 1 is a perspective view of a mask assembly including a headgear assembly, a seal assembly, and a frame assembly. [Figure 27] FIG. 27 is a perspective view of the cushion module, mask frame, and yoke of FIG. 26 separated from each other. [Figure 28] FIG. 1 is an exploded view of the cushion module, mask frame, and yoke. [Figure 29] FIG. 27 is a perspective view of the assembled cushion module, mask frame and yoke of FIG. 26. [Figure 30] FIG. 27 is a front view of the assembled cushion module, mask frame and yoke of FIG. 26. [Figure 31] FIG. 27 is a side view of the assembled cushion module, mask frame and yoke of FIG. 26. [Figure 32] FIG. 27 is a partial cross-sectional view of the assembled cushion module, mask frame and yoke of FIG. 26. [Figure 33] FIG. 27 is a partial cross-sectional view of the assembled cushion module, mask frame and yoke of FIG. 26. [Figure 34] FIG. 27 is a partial cross-sectional view of the assembled cushion module, mask frame and yoke of FIG. 26. [Figure 35] FIG. 27 is a front view of the frame of FIG. 26. [Figure 36] FIG. 27 is a side view of the frame of FIG. 26. [Figure 37]FIG. 27 is a rear view of the frame of FIG. 26. [Figure 38] FIG. 27 is a cross-sectional view of the frame of FIG. 26. [Figure 39] FIG. 27 is a front view of the yoke of FIG. 26. [Figure 40] FIG. 27 is a rear view of the yoke of FIG. 26. [Figure 41] FIG. 27 is a side view of the yoke of FIG. 26. [Figure 42] FIG. 27 is a partial cross-sectional view of the yoke of FIG. 26. [Figure 43] FIG. 27 is a partial cross-sectional view of the yoke of FIG. 26. [Figure 44] FIG. 10 is a cross-sectional view of a releasable lock in an open or unlocked position. [Figure 45] FIG. 10 is a cross-sectional view of a releasable lock in a closed or locked position. [Figure 46] FIG. 10 is a perspective view of a releasable lock. [Figure 47A] FIG. 10 is a side view of the releasable lock in an open or unlocked position. [Figure 47B] FIG. 10 is a side view of the releasable lock in a closed or locked position. [Figure 47C] FIG. 10 is a rear view of the releasable lock. [Figure 48A] FIG. 45 is a side view of a washer housing including a washer of the releasable lock of FIG. [Figure 48B] FIG. 45 is a rear view of the washer housing and washer of the releasable lock of FIG. [Figure 49] FIG. 1 is a perspective view of one embodiment of a washer. [Figure 50] FIG. 10 is a perspective view of an alternative embodiment of a washer. [Figure 51A] FIG. 10 is a side view of a non-releasable lock. [Figure 51B] FIG. 10 is a front view of a non-releasable lock. [Figure 51C] FIG. 10 is a perspective view of a washer of a non-releasable lock. [Figure 52]FIG. 1 is a perspective view of a mask assembly including a headgear assembly, a seal assembly, and a frame assembly fastened to a wearer's head with a releasable coupling including a release handle. [Figure 53] FIG. 12 is a perspective view of a mask assembly including a yoke portion of a headgear assembly, a seal assembly, and a frame assembly with a releasable coupling including a release handle. [Figure 54] FIG. 54 is an exploded view of the cushion module, mask frame, and yoke of FIG. 53. [Figure 55] FIG. 54 is a perspective view of the assembled cushion module, mask frame and yoke of FIG. 53. [Figure 56] FIG. 54 is a perspective view of the assembled cushion module, mask frame and yoke of FIG. 53. [Figure 57] FIG. 54 is a perspective view of the assembled cushion module, mask frame and yoke of FIG. 53. [Figure 58A] FIG. 54 is a perspective view of the assembled cushion module, mask frame and yoke of FIG. 53. [Figure 58B] FIG. 54 is a perspective view of the assembled cushion module, mask frame and yoke of FIG. 53. [Figure 59] FIG. 1 is a front view of a yoke with a release handle. [Figure 60A] FIG. 10 is a side view of a yoke configured to utilize a release handle. [Figure 60B] FIG. 10 is a rear view of a yoke configured to utilize a release handle. [Figure 61] FIG. 1 is a perspective view of a mask assembly including a headgear assembly, a seal assembly, and a frame assembly with a releasable coupling including a tilt action release mechanism. [Figure 62] FIG. 62 is a perspective view of the cushion module, mask frame, and yoke of FIG. 61. [Figure 63] FIG. 62 is an exploded view of the cushion module, mask frame, and yoke of FIG. 61. [Figure 64] FIG. 62 is a front view of the cushion module, mask frame, and yoke of FIG. 61. [Figure 65] FIG. 62 is a side view of the cushion module, mask frame, and yoke of FIG. 61. [Figure 66] FIG. 62 is a side view of the cushion module, mask frame and yoke of FIG. 61 with the tilt action mechanism in the engaged (released) position. [Figure 67] FIG. 62 is a side view of the cushion module, mask frame and yoke of FIG. 61 with the tilt action mechanism in the released (closed) position. [Figure 68] FIG. 62 is a perspective view of the tilting mechanism of the yoke as shown in FIG. 61. [Figure 69] FIG. 1 is a cross-sectional view of various components of the tilt mechanism in an engaged (disengaged) position. [Figure 70] FIG. 1 is a cross-sectional view of various components of the tilt mechanism with the tilt mechanism in the unlocked (closed) position. [Figure 71] FIG. 10 is a perspective view of a release arm of the tilt action release mechanism. [Figure 72] FIG. 10 is a side view of the release arm of the tilt action release mechanism. [Figure 73] FIG. 10 is a top view of the release arm of the tilt action release mechanism. [Figure 74] FIG. 10 is a rear view of the release arm of the tilt action release mechanism. [Figure 75] FIG. 1 is a perspective view of an embodiment of a mask assembly including a yoke portion of a headgear assembly, a cushion module, and a frame. [Figure 76] FIG. 76 is a perspective view of the left front side of the mask assembly of FIG. 75 in an exploded state. [Figure 77] FIG. 76 is a perspective view of the right rear side of the mask assembly of FIG. 75 in an exploded state. [Figure 78] FIG. 10 is a rear view of the yoke showing part of a first connection arrangement connecting the yoke to the frame. [Figure 79] FIG. 76 is a cross-sectional view of the mask assembly of FIG. 75 showing a first connection configuration. [Figure 80]FIG. 80 is an enlarged view of a portion of the cross-sectional view of FIG. 79 showing the first connection configuration. [Figure 81] FIG. 76 is another cross-sectional view of the mask assembly of FIG. 75 showing the first connection configuration. [Figure 82A] FIG. 76 is a cross-sectional view of the mask assembly of FIG. 75 showing a first connection configuration. [Figure 82B] FIG. 76 is a cross-sectional view of the mask assembly of FIG. 75 showing a second connection mechanism connecting the cushion module to the frame. [Figure 83] FIG. 82B is an enlarged view of a portion of the cross-sectional view of FIG. 82A showing the first connection configuration and the direction of movement for connecting the yoke to the frame. [Figure 84] 76 is a cross-sectional view of the mask assembly of FIG. 75 showing alignment features that align the cushion module with the frame. DETAILED DESCRIPTION OF THE INVENTION

[0052] Embodiments of systems, components, and methods of assembly and manufacturing will now be described with reference to the accompanying figures. Like numerals refer to like or similar elements throughout the figures. While several embodiments, examples, and illustrations are disclosed below, those skilled in the art will understand that the invention described herein goes beyond the scope of the specifically disclosed embodiments, examples, and illustrations and may include other uses of the invention as well as obvious modifications and equivalents of the invention. The terminology used in the description presented herein is not intended to be construed in any limiting or restrictive manner, merely because it is used in conjunction with the detailed description of several specific embodiments of the invention. Furthermore, embodiments of the invention may include several novel features, and no single feature is solely responsible for its desirable attributes or is essential to practicing the invention described herein.

[0053] In the following description, some terminology may be used merely for reference purposes and is therefore not intended to be limiting. For example, terms such as "top" and "bottom" refer to directions in the referenced drawings. Terms such as "horizontal," "vertical," "front," "rear," "left," "right," "back," and "side" describe the orientation and / or location of a component or some portion of an element in a consistent but arbitrary frame of reference that becomes clear by reference to the text and associated drawings describing the component or element under discussion, which, with respect to a patient interface, is often in a worn orientation with the user's head in an upright position. Furthermore, terms such as "first," "second," and "third" may be used to describe separate components. Such terminology may include the terms specifically mentioned above, their derivatives, and terms of similar importance.

[0054] Unless otherwise clearly required by context, throughout the specification and claims, words such as "comprise," "comprising," and the like should be interpreted in an inclusive sense, i.e., "including but not limited to," as opposed to an exclusive or exhaustive sense. In particular, conditional language used herein, such as "can," "could," "might," "may," "for example," and the like, is intended to generally suggest that some embodiments include certain features, elements, and / or conditions, while other embodiments do not, unless specifically stated otherwise or understood otherwise within the context in which it is used. Thus, such conditional language is generally not intended to suggest that features, elements, and / or conditions are in any way required by one or more embodiments, or that one or more embodiments necessarily include logic that determines whether or not those features, elements, and / or conditions should be included in or implemented in any particular embodiment, with or without authorial input or direction.

[0055] The term "plurality" refers to two or more elements. Enumerations of quantities, dimensions, sizes, formulations, parameters, shapes, and other characteristics should be interpreted as if the term "about" or "approximately" preceded such quantity, dimension, size, formulation, parameter, shape, or other characteristic. The term "about" or "approximately" means that the quantity, dimension, size, formulation, parameter, shape, and other characteristic need not be exact and may be approximated and / or larger or smaller, as appropriate, reflecting acceptable tolerances, conversion factors, rounding, measurement errors, etc., and other factors known to those of ordinary skill in the art. Enumerations of quantities, dimensions, sizes, formulations, parameters, shapes, and other characteristics should also be interpreted as if the term "substantially" preceded such quantity, dimension, size, formulation, parameter, shape, or other characteristic. The term "substantially" means that the enumerated characteristic, parameter, or value need not be achieved exactly, but rather that deviations or variations, including, for example, tolerances, measurement errors, measurement accuracy limits, and other factors known to those of ordinary skill in the art, may occur in an amount that does not eliminate the effect the characteristic is intended to provide.

[0056] Numerical data may be expressed or presented herein in a range format. It will be understood that such range format is used merely for convenience and brevity, and thus should be interpreted flexibly to include not only the numerical values ​​explicitly recited as the upper and lower limits of the range, but also to include all individual numerical values ​​or subranges subsumed within that range, as if each numerical value and subrange were explicitly recited. By way of illustration, a numerical range of "1 to 5" should be interpreted not only to include the explicitly recited values ​​of about 1 to about 5, but also to include each individual value and subrange within the stated range. Thus, included within this numerical range are individual values ​​such as 2, 3, and 4, as well as subranges such as "1 to 3," "2 to 4," and "3 to 5." This same principle should apply to ranges reciting only a single numerical value (e.g., "greater than 1"), regardless of the breadth or described characteristics of the range.

[0057] For convenience, several items may be presented in common lists. However, these lists should be construed as though each member of the list is individually identified as a separate and unique element. Accordingly, no individual element of such lists should be construed as a de facto equivalent of any other element of the same list solely based on being presented in a common group, unless otherwise indicated. Furthermore, the terms "and" and "or," when used in conjunction with a list of items, should be interpreted broadly in that any one or more of the listed items can be used alone or in combination with the other listed items. The term "alternatively" refers to the selection of one of two or more options and is not intended to limit the selection to only those options listed at a time or to only one of the listed options, unless the context clearly dictates otherwise.

[0058] The reference in this specification to any prior art is not, and should not be construed as, an acknowledgment or any form of suggestion that that prior art forms part of the common general knowledge in the field of endeavor in any country in the world.

[0059] Where the above description refers to whole entities or components that have known equivalents, those whole entities are incorporated herein as if individually set forth.

[0060] The invention may be broadly said to consist in the parts, elements and features referred to or shown individually or collectively in the specification of this application, and in any or all combinations of two or more of said parts, elements or features.

[0061] It should be noted that various variations and modifications to the presently preferred embodiments described herein will be apparent to those skilled in the art. Such variations and modifications can be made without departing from the spirit and scope of the present invention and without diminishing its attendant advantages. For example, various components can be rearranged as needed. Accordingly, such variations and modifications are intended to be included within the scope of the present invention. Moreover, not all features, aspects, and advantages are necessarily required to practice the present invention. Accordingly, the scope of the present invention is intended to be defined solely by the following claims.

[0062] The present disclosure relates to a respiratory interface assembly or respiratory mask assembly that incorporates one or more retaining or locking arrangements configured to hold the interface assembly in an adjusted (e.g., auto-adjusted) position, which may be a position sized to fit a particular user of the interface assembly, and a release (e.g., manual release) arrangement configured to release the retaining or locking arrangements and allow the interface assembly to move from the adjusted position with little or no opposing force, or with an opposing force that is less (e.g., significantly less) than the retaining or locking force of the retaining or locking arrangements.

[0063] 1-6 illustrate an example of a respiratory interface system or respiratory mask system 100 for delivering respiratory therapy to a patient. The mask system 100 may include an interface, such as a mask 102. In the illustrated configuration, the mask 102 includes a seal or seal module and a frame, as described in further detail herein. The illustrated mask system 100 also includes a headgear assembly 200 (sometimes referred to herein simply as "headgear"). The mask 102 and headgear 200 may include a connection system that attaches the headgear 200 to the mask 102. Various forms of connection systems may be used to attach the headgear 200 to the mask 102. Similarly, the mask 102 may be coupled to at least one, and possibly multiple, different types of headgear.

[0064] The mask 102 may include a seal 104 and a frame 106. The seal 104 may be configured to seal around and / or under the patient's mouth and / or nose. In the illustrated configuration, the seal 104 is a nasal seal configured to deliver a flow of respiratory gas only to the user's nose. In particular, the illustrated seal 104 includes a pair of nasal pillows configured to form a seal with the user's nares and a secondary sealing portion configured to surround the nasal pillows and form a secondary seal with one or more of the underside of the user's nose, the sides of the user's nose, and the user's upper lip. However, features of the present disclosure may be implemented with other mask systems having other types of mask seals, such as, for example and without limitation, a full-face seal. The frame 106 is configured to support the seal 104 and attach the seal 104 to a headgear 200. The frame 106 may also include a gas inlet 108 ( FIG. 5 ) configured to attach to a gas conduit 110 that delivers a flow of respiratory gas to the patient through the mask 102. The seal 104 can include a mounting frame or clip 122, which in some configurations can include a first portion 122a and a second portion 122b that capture a rim of the seal 104 therebetween. The clip 122 is configured to selectively connect to the frame 106, such as by a snap fit, a friction fit, or other suitable configuration. The frame 106 can include a vent 140 configured to exhaust gas from the interior of the seal 104. The mask 102 can also include a vent insert or diffuser 152 that covers the vent 140 to control the exhaust flow.

[0065] The headgear 200 of the respiratory mask system 100 is used to hold the mask 102 on the patient's face. The headgear 200 is typically attached to the mask 102 and wraps around the back of the patient's head to hold the mask 102 in sealing contact with the patient's face.

[0066] In one form, the headgear assembly 200 can include a yoke or collector 202 configured to attach to the mask 102, as described in more detail herein.

[0067] The yoke 202 can be configured to attach to straps of the headgear 200, with the straps and yoke 202 cooperating to form a closed loop that encircles the user's head. In the illustrated embodiment, the headgear 200 comprises an assembly of straps including a rear strap 204 configured to wrap around the back of the patient's head, an upper strap 206 configured to wrap over the top of the patient's head, and a pair of front straps 208 ( FIG. 6 ) configured to extend along the user's cheeks during use. In one form, each front strap 208 is attached to the rear strap 204 of the headgear assembly 200 by a rear connector 205, for example, to a free end 207 of the rear strap 204 or to a connector coupled to the free end 207. In another form, the rear straps 204 comprise side extensions that form the front straps that extend along the patient's cheeks during use.

[0068] In one form, the headgear 200 can be adjustable (e.g., manually adjustable, automatically adjustable) and / or can incorporate one or more locks (e.g., directional locks 1800) that allow the headgear 200 to be reduced in length with a relatively low amount of resistance while resisting an increase in the length of the headgear 200. In some configurations, the locking force of the directional locks 1800 can be overridden to allow the headgear 200 to be lengthened to accommodate the interface assembly 100. In some forms, the yoke 202 can form a collection point for filaments used in an automatically adjustable headgear system. In this form, the yoke 202 can incorporate one or more directional locks 1800, each of which can include one or more locking elements, which may be referred to herein as lock washers or washers. The lock washers are configured to frictionally engage the filaments during extension of the headgear 200 but allow relatively frictionless movement during retraction of the headgear 200. In some configurations, the headgear 200 or interface assembly 100 includes a release mechanism or configuration that is configured to release or hold the directional lock 1800 open to allow low-friction movement while a control or other actuator is being operated by a user, and to provide high friction resistance when the control or actuator is not being actuated.

[0069] The directional lock 1800 can be incorporated into the end of the yoke / collector 202, and the body of the yoke / collector 202 can be hollow enough to receive a filament therein. The headgear 200, or any portion thereof, can be configured according to any of the embodiments disclosed in applicant's U.S. Patent Application Publication No. 2016 / 0082217, U.S. Patent Application No. 14 / 856,193, filed September 16, 2015, and WO 2016 / 043603, all of which are incorporated herein by reference in their entireties.

[0070] 6, each front strap 208 can include a free end to which a connector 209 can be attached. Each connector 209 can mate with a complementary strap connector 203 located on the yoke 202. Preferably, the yoke 202 is substantially elongate with a strap connector 203 located at or near each end of the yoke 202.

[0071] The connection between the front straps 208 and the yoke 202 can be any suitable form of connection, such as a snap-fit ​​connection, a screw and thread type connection, or a hook-like connection. In one form, as shown in FIG. 6 , each strap connector 203 includes a cap 210 located at each end of the yoke 202. Each cap 210 can include an opening, such as an aperture or recess, configured to receive the connector 209 of the front strap 208 in a snap-fit ​​arrangement to attach the yoke 202 to the front strap 208 of the headgear assembly 200.

[0072] As mentioned above, the yoke 202 can also be configured to attach to the frame 106 of the mask 102. In one form, the frame 106 can include a recessed area configured to receive at least a portion of the yoke 202 therein when the yoke 202 and frame 106 are attached to one another. A cover sleeve or front portion 222 can be configured to facilitate removable connection of the yoke 202 to the frame 106.

[0073] 7-9 illustrate another example embodiment of a yoke 600 and a cushion or seal 502 coupled to a frame 500. The yoke 600, seal 502, and / or frame 500 may be similar to the yoke 202, cushion or seal 104, and / or frame 106, respectively, except as otherwise described below. The frame 500 includes a yoke channel 516 configured to receive the yoke 600 during use. The yoke channel 516 is formed or defined by an upper wall 522, a rear wall 524, and a lower wall 526. The yoke 600 has an increased asymmetry between the upper and lower edges of the yoke 600, as compared to, for example, the yoke 202. In the illustrated embodiment, the upper edge of the yoke 600 is more linear than the lower edge. The asymmetry advantageously provides an improved visual cue regarding the correct orientation for assembly of the yoke 600 to the frame 500 and helps to discourage incorrect assembly.

[0074] As shown in FIG. 8 , the yoke channel 516 includes connector recesses 528 in the upper and lower walls 522, 526. In the illustrated embodiment, the connector recesses 528 are positioned at, adjacent to, or near each lateral end of the yoke channel 516. The connector recesses 528 at least partially define or form the retention lip 523 at or along the leading edge of the yoke channel 516 (e.g., at or along the leading edges of the interior-facing surfaces of the upper and lower walls 522, 526). The yoke 600 includes connector protrusions 628 that protrude rearward from the top, bottom, and / or rear surfaces of the yoke 600. In the illustrated embodiment, the yoke 600 includes a connector protrusion 628 on each side of the center of the yoke 600. In the illustrated embodiment, the yoke 600 includes a front yoke section 602 and a rear yoke section 604 that are coupled to one another, as described in further detail herein, and the connector protrusions 628 are formed in the rear yoke section 604. The connector recess 528 is configured to receive the connector protrusion 628 when the frame 500 and the yoke 600 are coupled together to form a snap-fit ​​connection between the frame 500 and the yoke 600. When the frame 500 and the yoke 600 are coupled together, the retention lip 523 engages the yoke 600 forward of the connector protrusion 628 to contribute to the snap-fit ​​connection and retain the yoke 600 within the yoke channel 516. In the illustrated embodiment, the connector protrusion 628 and the connector recess 528 have a square or rectangular profile, which inhibits the yoke 600 from rotating out of the yoke channel 516, for example, in the direction indicated by the arrow in FIG.

[0075] In some embodiments, the yoke 600 has an elliptical or substantially elliptical cross-section, as shown, for example, in FIG. 11 . This shape advantageously reduces the size or volume of the yoke 600 and / or provides an improved aesthetic appearance. The lock washer housings 646, discussed in more detail herein, can have a D-shaped, substantially D-shaped, U-shaped, or substantially U-shaped cross-section, as shown, for example, in FIGS. 10B and 10C , to enable and / or contribute to the generally elliptical or substantially elliptical cross-section of the yoke 600. The washer housings 646 can be positioned in opposite vertical orientations relative to one another. In other words, one of the washer housings 646, for example, the left washer housing 646 as shown in FIG. 10C , can be oriented as an upward-facing U-shape, and the other washer housing 646, for example, the right washer housing 646 in FIG. 10C , can be oriented as a downward-facing U-shape. This configuration and orientation can advantageously facilitate reservoirs or collectors for excess filament used in automatically adjustable headgear systems, which may be referred to herein as line tracks 630, 632, extending above and below the left and right washer housings 646, respectively, as discussed in more detail herein. As shown in FIG. 11 , in the illustrated embodiment, the yoke 600 or a central portion of the yoke 600 has a depth D that is the same as, similar to, or corresponds to the depth of the yoke channel 516, such that the yoke 600 does not protrude, or does not substantially protrude, from the yoke channel 516. This advantageously reduces the overall size of the frame 500 and yoke 600 assembly.

[0076] 10A and 12, in the illustrated embodiment, the rear or back surface of the yoke 600 includes rear steps at each of the four lateral ends or sides of the central portion of the yoke 600 so that the yoke 600 has a stepped depth. In other words, the lateral portions of the yoke 600 that are positioned laterally outboard of the yoke channel 516 when the yoke 600 is coupled to the frame 500 have a greater depth D than the depth D of the central portion of the yoke 600 that is positioned within the yoke channel 516 when the yoke 600 is coupled to the frame 500. These steps form or define frame abutment surfaces 605 at the transitions between the central and lateral portions of the yoke 600. When the yoke 600 is coupled to the frame 500, each of the frame abutment surfaces 605 abuts or is positioned adjacent or proximate to one of the lateral edges 505 of the frame 500, as shown in FIG. The frame abutment surfaces 605 and lateral edges 505 help to properly align the yoke 600 with the frame 500 during assembly. The frame abutment surfaces 605 and lateral edges 505 also, or alternatively, provide a more secure connection between the yoke 600 and the frame 500. The reduced depth of the central portion of the yoke 600 advantageously reduces the overall size of the frame 500 and yoke 600 assembly.

[0077] As shown in Figures 9-11, in the illustrated embodiment, the yoke 600 includes a front yoke section 602 and a rear yoke section 604. The yoke 600 may also include two end caps 606 (as shown in Figure 14), one at each lateral end of the yoke 600. In the illustrated embodiment, the front yoke section 602 and the rear yoke section 604 are formed as separate components that are coupled together. In the embodiment of Figures 9-11, the dividing line 603 (shown in Figure 11) between the front yoke section 602 and the rear yoke section 604 is centered or generally centered, which may improve ease of manufacturing.

[0078] The front yoke section 602 and the rear yoke section 604 can be coupled together via a snap fit. In the illustrated embodiment, the front yoke section 602 includes a yoke fastener 613 that protrudes rearward from the rear surface of the front yoke section 602. In the illustrated embodiment, the yoke fastener 613 is vertically and / or laterally centered or generally centrally positioned with respect to the front yoke section 602 and is laterally elongated. The rear yoke section 604 includes a fastener aperture 615 that is sized, shaped, and positioned to receive the yoke fastener 613 to form a snap fit connection when the front yoke section 602 and the rear yoke section 604 are coupled together. The central connection between the front yoke section 602 and the rear yoke section 604 via the yoke fasteners 613 and fastener apertures 615 provides greater stiffness to the connection between the front yoke section 602 and the rear yoke section 604 and / or provides support for or inhibits torsional twisting between the front yoke section 602 and the rear yoke section 604. In some embodiments, the front yoke section 602 instead includes the fastener apertures 615 and the rear yoke section 604 includes the yoke fasteners 613. In some embodiments, the fastener apertures 615 include one or more fastener ridges 617 that extend along (e.g., laterally) a top and / or bottom edge of the fastener aperture 615 and protrude from the top and / or bottom edge into the fastener aperture 615. The yoke fastener 613 includes one or more corresponding notches 619 (shown in FIG. 11 ) extending along (e.g., laterally) the top and / or bottom surfaces of the yoke fastener 613 that are sized, shaped, and positioned to receive the fastener ridges 617 to form a snap-fit ​​connection. In some embodiments, the fastener aperture 615 includes one or more notches 619 and the yoke fastener 613 includes one or more fastener ridges 617.

[0079] 22-24 show a variation of the yoke 600 in which the rear yoke section 604 includes a fastener recess 615' instead of a fastener aperture 615. The fastener recess 615' does not extend through the entire thickness of the rear yoke section 604. The front yoke section 602 includes a rearwardly extending yoke fastener 613'. The fastener recess 615' is sized, shaped, and positioned to receive the yoke fastener 613' to form a friction-fit or interference-fit connection when the front yoke section 602 and the rear yoke section 604 are coupled together. In some such embodiments, the fastener recess 615' includes one or more interference-fit ridges 617' on the top and / or bottom surface or edges of the fastener recess 615'. In the illustrated embodiment, the interference ridges 617' are elongated and extend the entire depth of the fastener recess 615'. The interference ridges 617' are interposed between the fastener recesses 615' and the yoke fasteners 613' and help create a friction or interference fit to help join the front yoke section 602 and the rear yoke section 604 together. This configuration may advantageously allow for easier manufacturing, provide a neater finish (no apertures in the rear yoke section 604), and / or inhibit the ingress of dirt or other debris into the line tracks 630, 632 (due to the lack of apertures that allow the yoke 600 to be fully enclosed along its length), which may help maintain the functionality of the automatic headgear adjustment mechanism.

[0080] 9-11, the rear yoke portion 604 includes an upper alignment bead 612a that projects forward from the rear yoke portion 604 and extends along the length of the rear yoke portion 604 adjacent or adjacent to the upper surface of the rear yoke portion 604, and / or a lower alignment bead 612b that projects forward from the rear yoke portion 604 and extends along the length of the rear yoke portion 604 adjacent or adjacent to the lower surface of the rear yoke portion 604. The front yoke portion 602 includes an upper alignment groove 614a in the rear surface of the front yoke portion 602 that extends along the length of the front yoke portion 602 adjacent or adjacent to the upper surface of the front yoke portion 602, and / or a lower alignment groove 614b in the rear surface of the front yoke portion 602 that extends along the length of the front yoke portion 602 adjacent or adjacent to the lower surface of the front yoke 602. The upper alignment groove 614a and / or the lower alignment groove 614b receive the upper alignment bead 612a and / or the lower alignment bead 612b, respectively, when the front yoke section 602 and the rear yoke section 604 are coupled together. The alignment beads 612a, 612b and alignment grooves 614a, 614b help to precisely align the front yoke section 602 and the rear yoke section 604. The alignment beads 612a, 612b and alignment grooves 614a, 614b can also, or alternatively, resist or support twisting, for example, between the front yoke section 602 and the rear yoke section 604. In some embodiments, the alignment beads 612a, 612b and alignment grooves 614a, 614b can securely engage with one another, for example, in the form of a friction-fit or snap-fit ​​connection.

[0081] The end caps 606 can help secure the front yoke 602 and the rear yoke 604 together by clipping or snap-fitting over or onto the lateral ends of the front yoke 602 and the rear yoke 604. The end caps 606 can also allow for connection of the front straps (e.g., front straps 208) of the headgear (e.g., headgear 200) to the yoke 600. In some embodiments, each end cap 606 is overmolded onto the braided portion of the front strap.

[0082] As shown in FIGS. 15-21 , the lateral ends of the front yoke section 602 and the rear yoke section 604 include or are formed by end cap inserts 618. The end cap inserts 618 can be integrally formed with or attached to the lateral ends of the front yoke section 602 and the rear yoke section 604. The end cap inserts 618 have a reduced size or profile compared to the lateral portions of the yoke 600. The end caps 606 have internal cavities 609 that receive the end cap inserts 618. During assembly, the end caps 606 can be pivotally or hingedly connected over or snapped onto the end cap inserts 618, as shown in FIG. 15 .

[0083] As shown in FIG. 20 , each end cap 606 includes a retention hole 605 on one side (e.g., the rear side in the illustrated embodiment) and a retention notch 607 on the opposite side (e.g., the front side in the illustrated embodiment). In other embodiments, the positions of the retention holes 605 and retention notch 607 can be reversed. The positioning of the retention holes 605 at the rear of the end cap 606 in the illustrated embodiment advantageously conceals the retention holes 605 during use, thereby providing an improved aesthetic appearance. The retention notch 607 extends forward into the end cap 606 from the end cap cavity 609. The end cap insert 618 includes a first retention feature 616 on one of the front and rear faces (e.g., extending rearward from the yoke rear 604 portion of the end cap insert 618 in the illustrated embodiment) and a second retention feature 617 on the opposite side (e.g., extending forward from the yoke front 602 portion of the end cap insert 618 in the illustrated embodiment). To attach the end cap 606 to the yoke 600, for example, to an end cap insert 618, the retention hole 605 engages with a first retention feature 616, as shown in FIG. 15. The first retention feature 616 then acts as a hinge or pivot point, allowing the end cap 606 to pivot onto the end cap insert 618 in the direction indicated by the arrow in FIG. 15 until the second retention feature 617 and the retention notch 607 engage, for example, at a ridge or snap-fit ​​joint. The hinged connection allows the length L of the end cap insert 618 (shown in FIG. 18) to be reduced, providing a stronger connection between the yoke 600 and the end cap 606. Thus, the end cap 606 can be more steeply tapered. The reduced length of the end cap insert 618, end cap 606 and / or overall yoke 600 can advantageously reduce or minimize contact or digging of the yoke 600 with the patient's face.

[0084] In the illustrated embodiment, the first retention feature 616 is or includes an oval or stadium-shaped post extending rearward from the yoke aft section 604. The first retention feature 616 has a length or depth selected such that the outer or rearmost surface of the first retention feature 616 is flush or substantially flush with the aft surface of the yoke aft section 604. This increases the contact area and interaction between the end cap 606 and the end cap insert 618, increasing retention force. Thus, the connection between the end cap 606 and the end cap insert 618 can resist greater twisting forces along the length of the yoke 600 and / or rotational forces about the joint.

[0085] In the illustrated embodiment, the second retention feature 617 is or includes a raised tab that extends forward from the yoke front 602. The second retention feature 617 has a reduced length or depth compared to the first retention feature 616, which allows the end cap 606 to pass through the second retention feature 617 during assembly. In the illustrated embodiment, the second retention feature 617 has a chamfered lead-in 617a on one edge, for example, on a lateral edge (relative to the yoke 600) in the illustrated embodiment, which allows the end cap 606 to more easily hinge or pivot over and / or onto the second retention feature 617.

[0086] In some embodiments, the end caps 606 can be overmolded onto the ends of the braided elements of an automatic headgear adjustment mechanism, such as those shown and described in U.S. Provisional Patent Application No. 62 / 343,711, filed May 31, 2016, entitled "Directional Lock for Interface Headgear Arrangement," and PCT Application No. PCT / NZ2014 / 000074, both of which are incorporated herein by reference in their entireties. A core element or filament 642 can extend within the braided elements. The end caps 606 can connect the braided elements, and thus the headgear, to the yoke 600, resulting in a closed-loop headgear system.

[0087] As described herein, in some embodiments, the yoke 600 can form collectors or line tracks 630, 632 for core elements, such as filaments 642, used in an automatically adjustable or self-adjusting headgear system. In some configurations, the yoke 600 can provide separate spaces (e.g., line tracks 630, 632) for each of the filaments 642. As shown in FIG. 10C , the front yoke 602 includes an upper line track 630 and a lower line track 632. A line track divider 634 projects rearward from the rear or inner surface of the front yoke 602. The line track divider 634 extends generally diagonally across a portion of the length of the front yoke 602, transitioning from a relative upper position to a relative lower position with respect to the yoke 600. In the illustrated embodiment, a divider wall 635 extends between each of the washer housings 646 and the opposing line track. Divider wall 635 separates the opposing line tracks from washer housing 646, thereby preventing the free end of filament 642 from being pinched within the opposing washer housing 646 during retraction. In the illustrated embodiment, the line tracks 630, 632 are not symmetrically identical due to the asymmetrical top and bottom edges of yoke 600.

[0088] FIG. 14 shows a variation of the yoke 600 in which the line tracks 630, 632 extend into and terminate within the end cap 606. The lengths of the line tracks 630, 632 therefore extend beyond the ends of the front yoke 602 and rear yoke 604. This increases the length of the filament 642 that can be accumulated within the yoke 600, thereby increasing the range of headgear size adjustment or variability. The headgear assembly 200 defines a headgear loop that extends around the user's head in use. The filament 642 forms part of a headgear adjustment mechanism that allows the overall length of the headgear loop to be extended during donning and doffing of the mask system. In some such embodiments, the length of each of the line tracks 630, 632 can increase or extend by approximately 5 mm. In such embodiments, the overall length of the headgear loop can therefore increase by approximately 10 mm in the extended state.

[0089] 25A-25D show an embodiment of a directional lock 1800 comprising a housing 1810, first and second locking elements (e.g., washers 1820, 1822), and a core member or filament 1830. The housing 1810 comprises a first chamber 1840 and a second chamber 1842, where the first chamber 1840 and the second chamber 1842 are configured to receive a first locking washer 1820 and a second locking washer 1822, respectively. The washer 1820 can be made from a material that provides at least some resistance to wear from friction (e.g., polypropylene, high-density polyethylene, aluminum, steel). In the illustrated configuration, the first chamber 1840 and the second chamber 1842 are separated by an interior wall 1812 of the housing 1810. However, in other configurations, the first chamber 1840 and the second chamber 1842 are not necessarily physically separate spaces and can, for example, be part of a single chamber. The housing 1810 has two end walls 1814, which, together with the inner wall 1812, define an elongated core opening 1860 through which the core member or filament 1830 passes. The core member or filament 1830 can be an elongated thread, fiber, string, wire, or filament, such as nylon, polyethylene, polypropylene fiber, or metal (e.g., aluminum, copper, silver) wire. Advantageously, materials can be selected that offer at least some resistance to friction, abrasion, and splaying. Other shapes or geometries can be used, including rectangular cross-sections (e.g., ribbons, bands, or belts) or multiple threads, fibers, strings, wires, or filaments (e.g., cables or braided or stranded wires). All of these can be referred to as the core member 1830. One or more materials of the core member can be selected to be substantially inelastic, so that the core member 1830 can remain substantially the same length under elongational strain. The core openings 1860 can be substantially aligned with one another. The core opening 1860 in the end wall 1814 shown on the right side of the figure may be larger than one or both of the core openings 1860 in the inner wall 1812 and the end wall 1814 shown on the left side of the figure.This allows for manipulation or deflection of the path of the core member 1830 through the housing 1810. The first chamber 1840 and the second chamber 1842 are each bounded by an interior wall 1812, one of the end walls 1814, and a pair of side walls 1816 that extend between the end walls 1814 of the housing 1810. The first chamber 1840 and the second chamber 1842 are configured to be open at one or both of the top and bottom of the housing 1810.

[0090] Each of the first chamber 1840 and the second chamber 1842 has a pair of washer retainers 1850 aligned with opposing sidewalls 1816 of the housing 1810. The pair of washer retainers 1850 are configured to pivotally retain one of the first lock washer 1820 or the second lock washer 1822 within the respective first chamber 1840 or second chamber 1842. The washer retainer includes a circular bushing 1852 and an elongated slot 1854, where the circular bushing 1852 intersects with the bottom of the housing to form an entrance configured to allow the first lock washer 1820 and / or the second lock washer 1822 to be received within the washer retainer 1850. The slot 1854 extends radially from the circular bushing 1852 toward the top of the housing 1810.

[0091] The first washer 1820 and the second washer 1822 each include a cylindrical shaft 1824 and an arm 1826 extending from their respective shaft 1824. The cylindrical shaft 1824 has substantially the same width W as the housing 1810, and the arms 1826 are narrower to fit within the first chamber 1840 and the second chamber 1842. In the illustrated configuration, the arms 1826 include a first section 1872 and a second section 1874, where the first section 1872 extends radially or perpendicularly from the cylindrical shaft 1824 and the second section 1874 extends at an obtuse angle from the end of the first section 1872. The first section 1872 of the arm 1826 of the first washer 1820 is shorter than the first section 1872 of the arm 1826 of the second washer 1822. The angle between the first section 1872 and the second section 1874 of the arm 1826 of the first washer 1820 is greater than the corresponding angle of the second washer 1822. These angles can be selected so that the second section 1874 of one or both of the first washer 1820 and the second washer 1822 lies substantially flat against the corresponding wall of the housing 1810 (e.g., the interior wall 1812 and the end wall 1814, respectively) at one position of the washers 1820, 1822. The second section 1874 of the arm 1826 includes a centrally located circular aperture 1876 configured to receive the core member 1830. The first and second chambers 1840, 1842 differ in size according to the size of the washers housed therein; i.e., the first chamber 1840 is smaller than the second chamber 1842 because the first washer 1820 is smaller than the second washer 1822.

[0092] The cylindrical shafts 1824 of the first and second lock washers 1820, 1822 have substantially the same diameter as the circular bushings 1852 of the washer retainer 1850 and are configured to be received and retained by the circular bushings 1852 in a snap-fit ​​configuration. The snap-fit ​​configuration is provided by an entrance to the circular bushings 1852 that is narrower than the diameter of the cylindrical shafts 1824. The slots 1854 of the washer retainer 1850 are configured to allow the entrances to open and flex, improving the ease with which the first and second lock washers 1820, 1822 can be pushed through the entrances and assembled to the housing 1810. When assembled within the first and second chambers 1840, 1842 of the housing 1810, the first and second washers 1820, 1822 can pivot back and forth about a central axis extending through the cylindrical shafts 1824.

[0093] The core member 1830 can be configured to pass through a core opening 1860 in the housing 1810 and apertures 1876 in the first and second washers 1820, 1822. Applying tension to the core member 1830 causes the first and second lock washers 1820, 1822 to pivot rearward and / or forward between a locked and / or an open position. Figures 25A and 25B show the directional lock in a locked configuration where force is applied to the core member 1830 in a direction toward the left side of the figure (as indicated by the arrow). In one embodiment, a force applied to the core member 1830 in this configuration causes the first and second lock washers 1820, 1822 to pivot in a counterclockwise direction, causing the path of the core member 1830 through the directional lock 1800 to become non-linear or tortuous, and / or applying increased frictional forces resisting movement of the core member 1830, for example, due to increased contact area and increased contact pressure between the core member 1830 and the first and second lock washers 1820, 1822. Figures 25C and 25D show the directional lock in an open or unlocked configuration in which force is applied to the core member 1830 in a direction toward the right in the figure (as indicated by the arrow). In this configuration, the first and second lock washers 1820, 1822 can pivot in a clockwise direction such that the circular aperture 1876 and the core opening 1860 are aligned in a substantially straight line. This provides a smooth, low-friction path and / or reduced contact pressure so that the core member 1830 can be pulled substantially freely through the directional lock 1800. The amount of force required to move the core member 1830 through the directional lock 1800 can be altered based on the different amounts of frictional force exerted on the core member 1830 in the closed and open positions.

[0094] The illustrated embodiment of the directional lock 1800 utilizes a first lock washer 1820 and a second lock washer 1822, although fewer or more lock washers can be used. The number of lock washers, the type, length, and thickness of the core member 1830, and the geometry of the lock washer 1820 are design parameters that can be varied to determine the amount of force required to defeat the directional lock 1800 while in the closed configuration (the "yield force") and the amount of force required to open the lock while in the open configuration (the "opening force").

[0095] Further details of the operation of the directional lock 1800 are set out above and in the applicant's patent application PCT / NZ2014 / 000074, the contents of which are incorporated herein by reference in their entirety.

[0096] 26-43, several configurations for securing a respiratory interface, such as a respiratory mask, to a wearer's head and facilitating convenient removal of the interface are described in further detail. In FIGS. 26-43, the respiratory interface is a full-face mask having upper and lower headgear straps on each side of the user's head that connect the mask to a rear portion of the headgear. The mask, headgear, or other portions of the interface assembly may incorporate one or more directional locks that provide a locking or retaining force that tends to inhibit or prevent extension of the interface assembly while permitting retraction of the interface assembly against resistance less than (e.g., significantly less than) the locking or retaining force. Preferably, the directional locks are configured to offer little or substantially no resistance to retraction of the interface assembly. In the illustrated configurations, the interface assembly incorporates a release mechanism or configuration that allows the user to manually release the directional lock to facilitate extension of the interface assembly. Although the illustrated release mechanism or configuration is applied to a full face mask having upper and lower headgear straps, the release mechanism or configuration can be used or modified for use with other types of masks and headgear configurations, such as the nasal mask and two-strap headgear configurations of Figures 1-24, among others.

[0097] 26-34 illustrate a mask assembly that may include a cushion module 2020, a mask frame 2030, and a headgear configuration 200 that, in the illustrated configuration, includes a yoke 202. FIGS. 28-34 illustrate various views of the mask assembly, with the straps 208 and rear portion 204 of the headgear 200 omitted. The yoke 202 may be attached to the rear portion 204 of the headgear 200 via one or more upper straps 208 and / or one or more lower straps 208. In the illustrated configuration, the headgear 200 includes an upper strap 208 and a lower strap 208 on each side of the mask assembly. Advantageously, the upper strap 208 and / or the lower strap 208 may be coupled to the yoke 202 using one or more manually releasable or releasable locks, such as releasable locks 2048a, 2048b. An actuator or release element 2044 may be coupled to one or more releasable locks 2048a, 2048b to enable manual release or unlocking of the locks 2048a, 2048b. Headgear attachment posts, including lower headgear attachment posts 2012a, 2012b and upper headgear attachment posts 2012c, 2012d, may be provided to connect the straps 208 of the headgear 200 to the yoke 202. The yoke 202, mask frame 2030, and cushion module 2020 may be separate components that can be disassembled and reassembled. In other configurations, any combination of the yoke 202, mask frame 2030, and cushion module 2020 may be integrated with one another. Thus, although the yoke 202 is described herein as forming part of the headgear 200, in other configurations, the yoke 202 may be integral with or formed as part of a portion of the mask frame 2030 or cushion module 2020.

[0098] Generally, the mask assemblies of Figures 26-34 are similar in structure to the mask assemblies of Figures 1-24, except that the mask assemblies of Figures 26-34 are implemented in a full-face configuration rather than the nasal mask of Figures 1-24. The mask assemblies of Figures 26-34 include a frame 2030 configured to connect to a cushion module 2020 and a yoke 202. The frame 2030 is configured to connect to a gas conduit (not shown) that delivers a flow of respiratory gas to a user through the cushion module 2020. The illustrated frame 2030 has a central portion 2032 that defines an internal passageway configured to pass the flow of respiratory gas from the gas conduit to the cushion module 2020. The central portion 2032 and / or the internal passageway of the frame 2030 extend vertically and overlie the central portion 2022 of the cushion module 2020 when the mask assembly is viewed from the front. A plurality of arms 2034 extend in an arc rearward from a central portion 2032 of the frame 2030, roughly following the shape of the cushion module 2020. In the configuration shown, the frame 2030 has four arms 2034, including an upper right arm, an upper left arm, a lower right arm, and a lower left arm. The upper and lower arms 2034 can diverge from each other in the anterior-posterior direction. The illustrated upper arm 2034 extends upward, away from the lower arm 2034 in the anterior-posterior direction. The lower arms 2034 can have a generally or substantially horizontal orientation. This configuration can orient the headgear straps 208 in a desired direction to accommodate the ventilation holes 2024 of the cushion module 2020 and / or achieve a comfortable, sufficient seal.

[0099] The cushion module 2020 can include a relatively rigid housing 2021 and a relatively soft cushion or seal 104. In the illustrated configuration, the housing 2021 maintains the desired shape of the cushion module 2020, allows connection to the frame 2030, and defines at least a portion of the breathing chamber of the cushion module 2020. The cushion or seal 104 is removably or permanently coupled to the housing 2021 and is configured to provide a seal against the user's face to seal the breathing chamber. In the illustrated configuration, the housing 2021 also includes an exhaust port 2024, which allows exhaled air to exit the breathing chamber and provides a leak-restricted path configured to maintain positive pressure within the breathing chamber. The exhaust port 2024 is located above the inlet opening. The exhaust port includes a plurality of vent holes that extend through the housing 2021. In other configurations, the exhaust port 2024 can be located elsewhere, such as in the frame 2030.

[0100] The yoke 202 is configured to be removably coupled to the frame 2030 so that the headgear 200 can be coupled to the cushion module 2020 via the frame 2030. The yoke 202 has a shape similar to that of the frame 2030 when viewed from the front. The yoke 202 includes a central portion 2202 that overlaps part or all of the central portion 2032 of the frame 2030. The yoke 202 also includes a plurality of arms 2204 that arc rearward from the central portion 2202. In some configurations, the number of arms 2204 of the yoke 202 is equal to the number of arms 2034 of the frame 2030. In the configuration shown, the yoke 202 includes left and right upper arms 2204 and left and right lower arms 2204 that correspond to the upper and lower arms 2034 of the frame 2030, respectively. In some configurations, the arms 2204 of the yoke 202 are longer than the corresponding arms 2034 of the frame 2030 and therefore extend rearwardly beyond the ends of the corresponding arms 2034 of the frame 2030. The arms 2204 of the yoke 202 can extend beyond the housing 2021 of the cushion module 2020 such that the ends of the arms 2204 are located adjacent to or rearward of the seal 104.

[0101] The frame 2030 may include one or more walls or lips 2036 extending outward from the forward faces of the arms 2034 and adjacent the arms 2204 of the yoke 202. The walls 2036 may be configured to couple the yoke 202 to the frame 2030, such as by a snap-fit ​​arrangement, or may serve to inhibit or prevent rotation of the yoke 202 relative to the frame 2030 about one or more axes. In the illustrated configuration, a single wall 2036 extends along the central portion 2032 and the upper arms 2034, and additional single walls 2036 extend between each of the upper and lower arms 2034 on each of the left and right sides of the frame 2030.

[0102] The yoke 202 can include a front piece 2042 and a rear piece 2046 that are removably or permanently coupled to one another similar to the yokes 202 and 600 described with respect to Figures 1-24. The yoke 202 can define an interior space configured to receive excess portions of the core members or filaments (e.g., filaments 642, 1830) utilized by the directional locks 2048a, 2048b. Although not shown, the yoke 202 can divide the interior space into separate portions for each of the filaments.

[0103] As described above, the yoke 202 or other portions of the mask assembly of FIGS. 26-34 may include or support one or more actuators or release elements 2044. The release element 2044 may be configured to release, unlock, or open one or more releasable locks, such as releasable locks 2048a, 2048b. In the illustrated configuration, actuation of the release element 2044 prevents the directional lock from moving to a locked position in response to extension of the headgear 200 or the entire mask assembly. The release element 2044 thus allows for intentional or manual deactivation of the directional lock. In other words, while the release element 2044 is activated, normal operation of the directional lock (e.g., moving to a locked position in response to extension of the headgear 200) is temporarily stopped. However, the release element 2044 is contemplated for use with other types of headgear locking configurations. When used with other types of locks, the release element 2044 can be configured to physically move the lock to a released position when actuated to facilitate extension of the headgear 200 or the entire mask assembly. The specific operation of the release element 2044 can be configured for the specific lock utilized to achieve the goal of allowing manual or intentional release of the lock, allowing extension of the headgear 200 or the entire mask assembly with reduced effort.

[0104] The release element 2044 can be provided in different forms or shapes (e.g., a button, lever, or handle) and can be located in different locations on the yoke 202 or other portions of the mask assembly. Advantageously, in one configuration, the release element 2044 is at least partially located in front of and / or at least above the yoke 202 or mask, so that a user gripping the mask can naturally or intuitively apply force to the release element 2044 (e.g., by pushing or pinching the release element 2044 toward the yoke 202) in the process of donning or removing the mask assembly. Figures 33 and 34 show the release element 2044 in the released and activated positions, respectively.

[0105] In the illustrated configuration, the release element 2044 is in the form of an elongated button or bar that extends along and is spaced from the upper edge of the yoke 202. The release element 2044 may be curved similarly to the yoke 202, with the lateral ends of the release element 2044 positioned rearward of the central portion. Such a configuration may allow access to the release element 2044 from the center and sides of the mask assembly, while providing an attractive appearance. In other configurations, the release element 2044 may be positioned along the lower edge of the yoke 202.

[0106] Other configurations are possible in which the release elements 2044 are positioned relative to the yoke 202 so that a user can actuate the release elements 2044 in the course of gripping the yoke 202 or mask, thus intuitively triggering the release of one or more releasable locks (e.g., releasable locks 2048a, 2048b). For example, a pair of opposing release elements 2044 can be positioned so that a user can push the elements 2044 toward each other (e.g., horizontally, vertically, or in other directions relative to the orientation shown in the figures). In such a configuration, each release element 2044 can operate one or more releasable locks (e.g., 2048, 2048b).

[0107] In the illustrated configuration, the release element 2044 is coupled to the yoke 202 in a manner that limits or guides relative movement of the release element 2044. In particular, the release element 2044 includes a first guide element 2044a, and the yoke 202 includes a second guide element 2044b ( FIG. 32 ). The first guide element 2044a is captured for sliding movement within the second guide element 2044b, or vice versa, at least substantially limiting the transitional movement of the release element 2044 relative to the yoke 202. However, in other configurations, other types of movement, such as, for example, rotational movement, may be possible. In the illustrated configuration, the first guide element 2044a is an elongated, flat plate or bar, and the second guide element 2044b is a partially or fully enclosed slot having a shape corresponding to the shape of the first guide element 2044a. However, these configurations can be reversed. The slot can be defined by the yoke 202 or by a separate structure attached to the yoke 202. The illustrated configuration advantageously allows movement of the release element 2044 toward and away from the upper edge of the yoke 202, while inhibiting or substantially preventing relative movement in other directions to allow for smooth and / or consistent operation of the release element 2044.

[0108] In some configurations, a biasing element, such as a spring or other resilient element 2045, can be included, for example, between the release element 2044 and the yoke 202, and configured to bias the release element 2044 toward or to an inactivated position where the releasable locks 2048a, 2048b are locked or allowed to move to a locked or engaged position. In the illustrated configuration, a portion of the release element 2044 protrudes from the slot (second guide element 2044b) through an access opening in the yoke 202 and forms structure that engages one end of the biasing element 2045 ( FIG. 31 ). The yoke 202 includes structure that engages the other end of the biasing element 2045.

[0109] The number of releasable locks utilized in a given mask assembly can vary based on various relevant factors, including, among other possibilities, the type of mask or interface, the number of headgear straps connected to the mask, and the desired donning and doffing procedures. In the illustrated configuration, each of the lower straps 208 of the headgear 200 features a releasable lock 2048a, 2048b, while the upper strap 208 does not include a releasable lock. However, in the illustrated configuration, the upper strap 208 includes a directional lock (as described below) that is similar to or operates in the same manner as the directional lock 1800 described with reference to FIGS. 1-25. In full-face masks, the lower headgear straps often require a greater expansion than the upper headgear straps for comfortable donning or doffing of the full-face mask. Therefore, in some configurations, only the lower headgear straps may be provided with manually or intentionally releasable locks. Furthermore, tension in the lower straps during operation tends to be greater than tension in the upper straps. Thus, in configurations incorporating directional locks (or other automatic locks), the locking force of the lower straps may be greater than the locking force of the upper straps. Therefore, it may be more beneficial to provide a manual or intentional release mechanism for the lower straps, which has a higher locking force, and therefore greater resistance to stretching, than the lock on the upper straps. Providing manual or intentional release mechanisms for only some of the straps (e.g., the lower straps), can reduce system complexity and overall cost compared to configurations in which each strap is provided with a releasable lock. However, if desired, any of the straps or portions of the headgear can be provided with a releasable lock. Thus, in some configurations, the upper straps 208 can be installed with a releasable lock on one or both sides. Additionally, in some configurations, the lower straps 208 can be installed without a releasable lock.As discussed, in some configurations, all of the upper and lower straps 208 may be attached with releasable locks. Additionally, in some configurations, releasable locks may be provided at the back, top, or sides of the headgear to allow for extension of various headgear portions during donning and doffing.

[0110] The one or more releasable locks 2048a, 2048b can be connected to the release element 2044 directly or via an actuation arrangement configured to transfer movement from the release element 2044 to the releasable locks 2048a, 2048b. This actuation arrangement can be referred to herein as a linking member 2049. In some configurations, the linking member 2049 can be a substantially inelastic string, cable, or wire that can be pulled by movement of the release element 2044, thereby transferring force from the release element 2044 to the one or more releasable locks 2048a, 2048b. In some configurations, the linking member 2049 can be or include a Bowden cable, or a configuration similar to a Bowden cable, which includes an internal cable and a guide member or fixed guide channel such that movement at one end of the cable results in corresponding movement at the other end of the cable. In some configurations, the connecting member 2049 is a pull-only configuration that transmits a pulling force from the release element 2044 to the releasable locks 2048a, 2048b and utilizes a return bias element to move the connecting member 2049 in a return direction. In other configurations, the connecting member 2049 may be a push-pull configuration that can transmit a pushing or pulling force if desired. The illustrated connecting member 2049 does not include a continuous outer housing common to many Bowden cable configurations, but instead is guided along a fixed length path defined by one or more guide features, such as a central guide 2047a, an intermediate guide 2047b, and lateral guides 2047 (generally or collectively 2047). The guides 2047 are configured to define or alter the path of the connecting member 2049 between the release element 2044 and the releasable locks 2048a, 2048b. In the illustrated configuration, the guides 2047 are eyelets through which the connecting member 2049 passes. In the configuration shown, a single linking member 2049 connects to and actuates both releasable locks 2048a, 2048b. However, in alternative embodiments, each releasable lock 2048a, 2048b may be actuated by a dedicated linking member 2049, or the single linking member 2049 may be divided into multiple sub-members to control multiple releasable locks.Although shown here as a cable, the connecting member 2049 may be any suitable configuration, such as one or more rods, a linkage, or the like.

[0111] 44-46, 47A-47C, 48A-48B, and 49, an example of a releasable lock 2048a is shown in detail. Releasable lock 2048b can be of the same or similar configuration (e.g., mirror image) as releasable lock 2048a. Furthermore, the basic components and operation of releasable lock 2048a can be the same or similar to directional lock 1800 described above, with the notable difference being the release feature and shape of lock washer 1820 as described herein. Releasable lock 2048a can include one or more washers 1820, a biasing spring 2051, and a channel 2052 that receives a release member 2053. In the illustrated configuration, channel 2052 is defined by yoke 202; however, in other configurations, channel 2052 can be defined by structure that is separate from and assembled to yoke 202. Release member 2053 is attached to linking member 2049 at linking member connection 2055. One or more locking elements or lock washers 1820 can be received within washer housing 646. In the illustrated configuration, multiple (e.g., five) lock washers 1820 are provided. However, the actual number can vary based on, among other factors, the desired locking force of lock 2048a.

[0112] The release member 2053 is free to slide within the channel 2052. The release member 2053 is movable to selectively engage the lock washer 1820 to either move it to a released or unlocked position or to hold it in the released or unlocked position (preventing it from moving away). As described above, in the released or unlocked position of the lock washer 1820, movement of the filament (not shown, e.g., 642, 1830) in the elongation direction of the associated strap 208 is unresisted or permitted with significantly reduced resistance compared to the locked position of the lock washer 1820. The release member 2053 is moved to an actuated position (engaging or obstructing the lock washer 1820) or is actuated by the release element 2044 via the coupling member 2049. This position may be referred to as the unlocked or open position of the release mechanism or releasable lock 2048a and is shown in Figures 45 and 47B. A biasing spring 2051 or another suitable biasing arrangement is configured to return the release member 2053 to an inactivated position where the lock washer 1820 is free to move and operate normally (free to move to the locked position in response to movement in the extension direction). This position may be referred to as the locked, engaged, operable or normal position of the release mechanism or engageable lock 2048a and is shown in Figures 44 and 47A.

[0113] With the release member 1830 in the unactuated position, the washer 1820 can move between the unlocked and locked positions in response to the retraction and extension of the strap 208 or headgear 200, respectively. As discussed with reference to FIGS. 25A-25D , if the washer 1820 is allowed to move or pivot, movement of the filament or core member 1830 in the extension direction can be limited (e.g., inhibited or prevented) by friction between the core member 1830 and the washer 1820. Conversely, when the washer 1820 is held in the unlocked position, friction between the core member 1830 and the washer 1820 is reduced, and movement of the core member 1830 in the extension direction is easier compared to the locked position.

[0114] 48B and 49 , each washer 1820 can include one or more protrusions 1821 a, 1821 b. These protrusions 1821 a, 1821 b can define engagement surfaces configured to selectively engage the release member 2053 to either move the washer 1820 to the unlocked position or to prevent the washer 1820 from moving away from the unlocked position, thus allowing relatively free movement of the core member 1830 in the extension direction (as well as the retraction direction). The release member 2053 can include an appropriate number of actuators 2054 a, 2054 b configured to contact the protrusions 1821 a, 1821 b. In the illustrated configuration, the actuators 2054 a, 2054 b are in the form of tabs or arms extending from a body portion of the release member 2053. In the illustrated configuration, protrusions 1821a, 1821b are located on each side of the washer 1820, and corresponding actuators 2054a, 2054b of the release member 2053, which are also provided on each side of the release member 2053, apply balanced forces to each side of the washer 1820 to provide smooth pivoting movement of the washer 1820 and reduce or prevent binding.

[0115] FIG. 50 shows an alternative washer 1820 including only one protrusion 1821 a. In the configuration of FIG. 50, the single protrusion 1821 a is centered relative to the pivot structure with which the housing 1810 engages to reduce or prevent snagging. However, some configurations may employ an off-center protrusion 1821 or multiple protrusions, and other methods or structures, such as a pivot structure, may resist snagging. Other configurations, including multiple protrusions and other geometries, may be used in addition to or in place of the protrusion 1821 a.

[0116] 51A-51C, a lock 2058 is shown that, in some aspects, is similar to releasable locks 2048a, 2048b, incorporating washers 1820 in washer housing 646, but without a releasable mechanism. In some configurations, the basic components and operation of lock 2058 may be the same or similar to directional lock 1800 described above, except as described herein. The illustrated lock 2058 includes multiple washers 1820. In particular, in the illustrated configuration, lock 2058 includes three washers. In some configurations, each of locks 2058 includes fewer washers than each of releasable locks 2048a, 2048b. In some such configurations, one or more locks 2058 are employed on each upper strap 208 of the headgear 200, and one or more locks 2048a, 2048b are employed on each lower strap 208 of the headgear 200. It will be appreciated that any desired combination of engageable locks 2048a, 2048b and non-releasable locks 2058 can be used in the same mask assembly.

[0117] 52-60B, another embodiment of a mask assembly is disclosed that may be similar in some aspects to the mask assembly shown in FIGS. 26-51C, but that includes a release element in the form of a release handle 2050 instead of the release bar 2044 of FIGS. 26-51C. Accordingly, features not described in detail herein may be the same or similar to corresponding features disclosed herein, or may be of another suitable configuration. The release handle 2050 may be attached to the yoke 202 and may be directly or indirectly connected to the release member 2053, such that tension on the handle 2050 transfers force to the release member 2053. In the configuration shown, the release handle 2050 is directly connected to the release member 2053. In other configurations, the release handle 2050 may be integral with the release member 2053, or may be connected to the release member 2053 by an intervening structure to, among other possibilities, gain mechanical advantage, change the direction or type of movement, or avoid interference with other structures. In one embodiment, the release handle 2050 can be configured so that a mask wearer can grasp the handle and pull it away from their face, thereby moving the release member 2053 to the activated position, as shown in FIG. 58B. With particular reference to FIGS. 55 and 56, the release handle 2050 can curve downward from the side portions to the center or front portion, such that the top surface of the center portion is concave. Such a configuration provides an intuitive portion of the release handle 2050 for a user to grasp. As disclosed herein, when the release member 2053 is in the activated position, the releasable locks 2048a, 2048b are released such that the locks 2048a, 2048b do not significantly resist extension movement of the lower strap 208 of the headgear 200. When the user releases the release handle 2050, the biasing spring 2051 returns the release member 2053 to its inactivated position, as shown in FIG. 58A, so that the release handle 2050 can also be retracted. In such a position, the releasable locks 2048a, 2048b operate normally to inhibit or prevent extension movement of the lower straps 208 of the headgear 200.

[0118] 61-70, another mask assembly is disclosed that may be similar in some aspects to the other mask assemblies disclosed herein with reference to FIGS. 26-60B, but that includes a release arm 2060 attached to the yoke 202 instead of, or in addition to, a release handle 2050 or releasable bar 2044. Accordingly, features not described in detail herein may be the same or similar to corresponding features disclosed herein, or may be of another suitable configuration. The illustrated mask assembly includes one release arm 2060 on one side of the yoke 202, configured to interact with one of the lower straps 208 of the headgear 200 and the release member 2053 of the releasable lock 2048a. In some configurations, another release arm (which may be a mirror image of the release arm 2060) may be employed on the opposing lower strap 208 of the headgear 200, configured to interact with the other lower release lock 2048b. Alternatively, a linkage or other motion transfer arrangement can be configured to couple both locks 2048a, 2048b to the movement of a single release arm 2060. In other configurations, release arms 2060 can be employed on any or all of the straps 208 of the headgear 200.

[0119] The release arm 2060 is movable relative to the yoke 202. In some configurations, the release arm 2060 is configured to pivot relative to or is pivotally supported by the yoke 202. In the configuration shown, the yoke 202 includes at least one pivot 2062 in the form of a protrusion configured to be engaged, received, or retained by a complementary feature on the release arm 2060. The protrusion may be cylindrical, as shown. Preferably, the yoke 202 includes a pivot 2062 on each of a side facing away from the user and a side facing toward the user. Thus, the release arm 2060 may be configured to pivot, rotate, or swivel about a pivot axis defined by the pivot 2062.

[0120] The release arm 2060 is configured to directly or indirectly contact or otherwise engage with the release member 2053 to move the release member 2053 from the inactivated position to the activated position. In particular, as the release arm 2060 rotates about the pivot 2062 in a clockwise direction relative to the orientation shown in the figures, the release arm 2060 contacts the engagement portion 2055a of the release member 2053 and, if the release arm 2060 rotates a sufficient amount, moves the release member 2053 to the activated position. Thus, as the release arm 2060 moves from a substantially flat or horizontal position, as shown in FIGS. 66 and 69, to a substantially inclined or elevated position, as shown in FIGS. 63, 67, and 70, the release member 2053 moves from the inactivated position to the activated position. Conversely, when the release arm 2060 returns to a flat or horizontal position, the release member 2053 can return to the inactivated position, or when the force tending to rotate the release arm 2060 in a clockwise direction is removed, the biasing spring 2051 (or other biasing element) can move the release member 2053 from the activated position to the inactivated position, thereby allowing the release arm 2080 to rotate toward or back to a substantially flat position.

[0121] While the release arm 2060 can be configured to be directly manually operated by the user, in the illustrated configuration, the release arm 2060 engages the strap 208 of the headgear 200 and is configured to actuate as a result of relative movement between the yoke 202, mask frame 2030, or cushion 2020 and the headgear strap 208. For example, to remove the mask assembly, the user can grasp the yoke 202, mask frame 2030, or cushion 2020 (collectively referred to as the "mask" for convenience) and rotate at least the bottom of the mask upward and / or outward away from the user's face (e.g., chin). The strap 208 of the headgear 200 tends to stay in place on the user's head due to frictional contact with the user and tension on the headgear strap 208. Thus, user-initiated mask movement causes the release arm 2060 to move clockwise relative to the mask, as described above, which actuates the release member 2053. As a result, one or both of the releasable locks 2048a, 2048b are released, allowing at least the lower straps 208 of the headgear 200 to extend with reduced or little resistance. Similarly, when a user places the rear portion 204 of the headgear on their head and rotates the bottom of the mask away from their face so that the mask can pass over their nose, clockwise movement of the release arm 2060 relative to the mask is effected. Thus, one or both of the releasable locks 2048a, 2048b are released, allowing at least the lower straps 208 of the headgear 200 to extend with reduced or little resistance during donning of the mask assembly. Advantageously, the pivot 2062 can be located below the lower headgear mounting posts 2012a, 2012b to reduce tension in the lower straps 208 that exert torque on the release arm 2060. The range of rotation of the release arm 2060 may be limited by the range of linear movement of the release member 2053 and / or contact of the release arm with the yoke 202. Alternatively, a separate protrusion or any suitable mechanical stop may be implemented to limit the rotation of the release arm.

[0122] 71-74 , the release arm 2060 can include a headgear engagement feature 2084, a pivot connection 2083, a stop 2086, and an engagement surface 2088. The headgear engagement feature 2084 is configured to couple the release arm 1060 to a portion of the headgear 200, such as a strap 208 (e.g., a lower strap) of the headgear 200, such that the release arm 2060 is configured to move relative to the yoke 202 or mask in response to relative movement between the headgear 200 and the yoke 202, mask frame 2030, or cushion module 2020, as described above. In the illustrated configuration, the headgear engagement feature 2084 is a loop or collar configured to encircle a substantial portion or all of the strap 208 of the headgear 200. The illustrated headgear engagement feature 2084 has a small opening 2085 that allows for insertion of the strap 208 into the interior space of the loop or collar. The opening 2085 gives the engagement feature 2084 a generally C-shaped cross-section. In other configurations, the loop or collar can form a completely closed loop. Other suitable configurations for coupling to the headgear 200 (or other portion of the mask that moves relative to it during donning or doffing) can also be used, such as hooks, rims, or other connectors (e.g., snap-fit ​​connectors or other interlocking connectors) into which a corresponding mating part or connector from the headgear 200 can be inserted.

[0123] In some configurations, the headgear positioning features 2084 provide a removable connection between the headgear straps 208 and the release arms 2060. In other configurations, the connection between the headgear positioning features 2084 and the headgear 200 can be permanent, for example, by overmolding the headgear positioning features 2084 and the headgear straps 208 (e.g., with silicone rubber).

[0124] The pivot connection 2083 is configured to allow the release arm 2060 to be removably or permanently connected to the yoke 202 for rotation about a pivot axis defined by the pivot 2062. In the illustrated configuration, the pivot connection 2083 has an inner portion and an outer portion connected by a bridge portion. The inner and outer portions have different shapes such that the overall pivot connection 2083 is asymmetric. In the illustrated configuration, the inner portion is configured to provide a secure connection with the corresponding pivot 2062 of the yoke 202. Thus, the inner portion encompasses a larger portion of the periphery of the pivot 2062 and has more material surrounding the recess that receives the pivot 2062 to inhibit or prevent deformation that could allow the pivot connection 2083 and yoke 202 to unintentionally separate.

[0125] The outer portion is configured to pivot about a corresponding pivot 2062 of the yoke 202 and includes an engagement surface 2088 configured to selectively contact the engagement portion 2055a ( FIGS. 69 and 70 ) and move the release member 2053. Thus, in the illustrated configuration, the outer portion of the pivot connection 2083 surrounds a smaller portion of the periphery of the corresponding pivot 2062 compared to the inner portion. Additionally, the outer portion has less material surrounding the pivot 2062 compared to the inner portion.

[0126] The engagement surface 2088 is located above a recess configured to receive the pivot 2062. In the illustrated configuration, the engagement surface 2088 is substantially planar (straight from the side) and angled away from the release member 2053 in a direction from the bottom to the top of the engagement surface 2088. However, other suitable shapes (e.g., single curve, multiple curves) can be employed for the engagement surface 2088 depending, for example, on the desired rate of movement of the release member 2053 in response to movement of the release arm 2060 relative to the yoke 202.

[0127] In the illustrated configuration, the release arm 2060 includes a stop surface or stop 2086 that limits the rotational movement of the release arm 2060 relative to the yoke 202. The illustrated stop 2086 is defined by the bridge portion of the pivot connection 2083, and specifically by the front edge of the bridge portion. Upon sufficient rotation of the release arm 2060 in a clockwise direction relative to the yoke 202, the stop 2086 of the release arm 2060 contacts the yoke 202 (e.g., the top surface of the yoke 202) and limits the movement of the release arm 2060. This configuration reduces or prevents excessive force from being applied to the release member 2053. However, in other configurations, the release member 2053 can be configured to define a stop point for the rotation of the release arm 2060 and, therefore, can be configured to accommodate expected loads.

[0128] Advantageously, the release arm 2060 may be shaped to correspond to the shape of the user's head over which it extends and / or the desired path of the corresponding strap 208 or other portion of the headgear 200. In the illustrated configuration, the rear portion of the release arm 2060 (e.g., including the headgear positioning feature 2084) bends or curves slightly inward compared to the front portion (e.g., including the pivot connection 2083) to follow the expected curvature of the user's face and / or the desired path of the headgear strap 208.

[0129] 75-84 illustrate a mask assembly 7500 suitable for use with any of the retention or locking and release configurations described above. The mask assembly 7500 includes an alternative configuration for coupling the yoke 202 and cushion module 2020 to the frame 2030 relative to the previously disclosed assemblies. Accordingly, for clarity, some features of the retention or locking and release configurations are omitted. However, the mask assembly 7500 may incorporate, or be modified to incorporate, any of the retention or locking and / or release configurations disclosed herein. Alternatively, a previously disclosed mask assembly may incorporate, or be modified to incorporate, any of the coupling configurations disclosed for the mask assembly 7500. Furthermore, in many respects, the yoke 202, cushion module 2020, and frame 2030 are the same as or similar to one or more of the previously described embodiments. Accordingly, features or components of the mask assembly 7500 not described in detail below may be the same as or similar to corresponding features or components previously described, or may be of another suitable configuration.

[0130] In the illustrated configuration, the yoke 202, cushion module 2020, and frame 2030 are separate or separable components that can be selectively assembled and disassembled. The ability to easily separate and reassemble the yoke 202, cushion module 2020, and mask frame 2030 from one another can provide various advantages, including, among other things, easier cleaning of the mask by the user, replacement of components, and the ability to disassemble the mask for easier transport and storage.

[0131] The illustrated mask assembly 7500 includes a first or yoke-frame connection configuration that allows for selective connection of the yoke 202 to the mask frame 2030. In particular, the illustrated mask frame 2030 includes a ridge or lip 7909 that surrounds at least a portion of the periphery of the frame 2030 and provides a feature or structure to which the yoke 202 can be removably attached or clipped. In the illustrated configuration, the lip 7909 is provided on at least each side of the frame 2030. However, in other configurations, the lip 7909 can define a complete closed-loop periphery. Alternatively, the lip 7909 can be provided in multiple discrete locations. That is, the lip 7909 can be provided only at locations that correspond to engagement features of the yoke 202, as described below. In the illustrated configuration, the lip 7909 is formed by an extension of the front wall of the mask frame 2030 such that the anterior surface of the lip 7909 is flush with an adjacent portion of the front wall of the mask frame 2030. The lip 7909 may be integrally formed with the mask frame 2030 (e.g., formed as a protrusion from the mask frame 2030) or may be a separate structure that is attached to the mask frame 2030 (e.g., mechanically coupled to or formed by an overmolded structure). Advantageously, the geometry of the mask frame 2030 and / or the lip 7909 may be asymmetric to inhibit or prevent rotation or pivoting of the yoke 202 and provide a single, stable orientation of the yoke 202 relative to the mask frame 2030.

[0132] 76-78, as with the previous embodiments, the illustrated yoke 202 includes a first or front piece or portion 2042 and a second or rear piece or portion 2046. The front piece 2042 and the rear piece 2046 can be permanently or removably coupled to one another. The front piece 2042 and the rear piece 2046 cooperate to define one or more interior spaces configured to receive components of a retention or locking arrangement, such as directional locks 1800 (FIGS. 25A-25D), 2048 (FIGS. 26-34), and 2058 (FIGS. 51A, 51B). The yoke 202 includes a central portion 2202 and multiple arms (e.g., four arms 2204) arcing rearward from the central portion. The arms 2204 are configured to connect to headgear straps. In some configurations, each arm 2204 can be connected to a single headgear strap, such that the number of straps equals the number of arms 2204. However, in other configurations, multiple straps can be connected to a single arm 2204, such that the number of straps is greater than the number of arms 2204, or a single strap can be connected to multiple arms 2204, such that the number of straps is less than the number of arms 2204 (e.g., a strap can extend from a rear portion of the headgear to a first arm, from the first arm to a second arm, and then back to the rear portion of the headgear).

[0133] The illustrated frame 2030 defines an internal passageway 2031 configured to pass a flow of breathing gas from a gas conduit (not shown) to the cushion module 2020. The frame 2030 and / or internal passageway extend vertically and overlie a central portion of the cushion module 2020 when the mask assembly is viewed from the front. The upper edge of the frame 2030 terminates a relatively short distance above the inlet opening of the cushion module 2020 and may include a downwardly curved or concave upper surface configured to accommodate the vent hole 2024 of the cushion module 2020. The mask frame 2030 may be configured to be connected to a gas conduit (not shown). In the illustrated configuration, a conduit connector portion 7512 is permanently or removably coupled to the lower end of the frame 2030 and is configured to be directly or indirectly coupled to the gas conduit. The conduit connector portion 7512 may also secure a valve member of an anti-asphyxiation valve (AAV) within the interior passage of the frame 2030 .

[0134] FIG. 78 shows the rear part 2046 of the yoke 202, which faces the frame 2030. The rear side of the yoke 202 includes part of the first or yoke-frame connection configuration. In particular, the rear part 2046 of the yoke 202 includes one or more connection features, generally designated 7612, that are configured to engage a portion of the frame 2030, such as lip 7909. The illustrated connection features 7612 are in the form of flexible fingers or arms. In the illustrated configuration, the yoke 202 includes four connection features 7612a, 7612b, 7612c, and 7612d spaced around the periphery of the base or central portion 2202 of the yoke 202. Connection features 7612a, 7612b, 7612c, 7612d can be substantially similar or identical, and therefore, unless otherwise indicated, any description of a particular connection feature 7612a, 7612b, 7612c, 7612d or of connection feature 7612 as a whole can apply to each connection feature 7612a, 7612b, 7612c, 7612d.

[0135] Each of the connection features 7612a, 7612b, 7612c, and 7612d is associated with one of the arms 2204 of the yoke 202. In particular, each of the connection features 7612a, 7612b, 7612c, and 7612d is located at or adjacent to the base of the associated arm 2204 at or near the junction of the arm 2204 and the central portion 2202. This configuration conceals the connection features 7612a, 7612b, 7612c, and 7612d when the yoke 202 is assembled to the frame 2030, providing a clean and attractive appearance. In other configurations, other numbers of connection features 7612 can be provided. For example, one, two, three, five, six, or more connection features 7612 can be provided. The connection features 7612 can be arranged in a radial configuration around the periphery of the central portion 2202. The connecting features 7612a, 7612b, 7612c, 7612d may be integral with the rear part 2046 made from an elastically deformable material such as, for example, polypropylene, high density polyethylene, or polycarbonate.

[0136] The fingers or connecting features 7612a, 7612b, 7612c, 7612d are hook-like tabs that extend rearward from the rear surface of the rear part 2046 of the yoke 202. The fingers or tabs 7612a, 7612b, 7612c, 7612d have a first end connected to (e.g., integrally formed with) the rear part 2046 of the yoke 202 and a second end defining an inwardly extending hem, catch, or protrusion 7614 configured to engage with a lip 7909 of the frame 2030. In particular, each protrusion 7614 defines a first interlocking surface configured to contact the rear surface of the lip 7909, which functions as a second interlocking surface, and each protrusion 7614 and the lip 7909 define a snap-fit ​​or interlocking connection. The rearward-facing surface of the projection 7614, or the leading surface relative to the assembly direction, may be chamfered, angled, or sloped so that the fingers or connecting features 7612a, 7612b, 7612c, 7612d deflect outward upon contact with and movement toward the lip 7909 of the frame 2030. As the projection 7614 moves past the lip 7909, the fingers or connecting features 7612a, 7612b, 7612c, 7612d may elastically recover and move radially until the projection 7614 engages the lip 7909. In an alternative configuration, the illustrated configuration can be reversed so that the fingers or connecting features 7612a, 7612b, 7612c, 7612d are located on the frame 2030 and the lip 7909 is located on the yoke 202. Additionally, other types of structures that provide cooperating interlocking surfaces can be used.

[0137] FIG. 83 illustrates the general directions of forces applied to the yoke 202 and frame 2030 during the connection or assembly process. For example, a first force may be applied to the yoke 202 substantially in the direction of arrow 7916. The first force may be applied by a user's hand pushing or pulling the yoke toward the frame 2030. A second or reaction force is applied in a direction substantially opposite to the first force, as indicated by arrow 7912. The connection feature 7612 and lip 7909 are pressed against one another, causing one or both to slightly deform or flex (e.g., elastically deform), thereby allowing the connection feature 7612 to pass the lip 7909. The path of deflection of the connection feature 7612 is substantially radially outward, as indicated by arrow 7920. The deformation or flexure may be limited by a stop surface 7913 defined by the corresponding arm 2204 of the yoke 202 in the illustrated configuration. Advantageously, such a configuration may limit deflection of the connection feature 7612 within a range of elastic deformation, reducing the risk of breakage and extending the useful life of the yoke 202 compared to a configuration that does not limit deflection of the connection feature 7612. The stop surface 7913 may be separated from the connection feature 7612 by a gap 7905, which may extend partially or completely through the rear wall of the rear part 2046 of the yoke 202. The gap 7905 may facilitate deflection of the connection feature 7612 and / or decouple movement of the connection feature 7612 and the associated arm 2204, such that movement of the arm 2204 does not cause movement of the connection feature 7612, or at least not enough movement to cause unintended separation of the connection feature 7612 from the lip 7909. After the connection feature 7612 passes through the lip 7909, the elastic nature of the connection feature 7612 allows the connection feature 7612 to elastically recover towards or to its relaxed position, and the protrusion 7614 engages with the lip 7909 to secure the yoke 202 to the frame 2030.

[0138] 78 and 83 , the rear part 2046 of the yoke 202 can include a recess 7616 associated with each of the fingers or connecting features 7612. Each recess 7616 is located adjacent a first end of the associated finger or connecting feature 7612 to facilitate deflection of the finger or connecting feature 7612. Preferably, the recess 7616 is adjacent the finger or connecting feature 7612. However, in other configurations, the recess 7616 is located sufficiently close to the finger or connecting feature 7612 so that the required deflection force is lower than a design that does not include the recess 7616. In alternative configurations, a single recess can be associated with or located adjacent to two or more or all of the fingers or connecting features 7612. For example, a single recess can extend along one side of the central portion 2202 and adjacent each of the fingers or connecting features 7612 on that side. Alternatively, a single recess can surround the central portion 2202 and be located adjacent to all of the fingers or connecting features 7612 .

[0139] The illustrated mask assembly 7500 includes a second or cushion module-frame connection configuration that allows for selective connection of the cushion module 2020 to the mask frame 2030. The mask frame 2030 includes a rearwardly extending cylindrical collar 7520 configured to engage a corresponding opening 7522 defined by a cylindrical wall 7524 of the housing 7504 of the cushion module 2020. The cylindrical wall 7524 may extend inward from the outer wall of the housing 7504 toward or into the breathing chamber of the cushion module 2020. In the illustrated configuration, the collar 7520 and opening 7522 define a circular or substantially circular perimeter. However, in other configurations, the collar 7520 and / or opening 7522 may have a non-circular shape, such as, for example, an oval or polygonal shape. Accordingly, the term "cylindrical," as used herein, unless otherwise indicated, may include an extruded closed loop of any perimeter shape.

[0140] The illustrated mask frame 2030 includes one or more recesses 7620 configured to receive corresponding protrusions 7622 of the cushion module 2020. However, this configuration can also be reversed, such that the mask frame 2030 includes one or more protrusions and the cushion module 2020 includes corresponding recesses. The illustrated mask frame 2030 includes a pair of partially annular recesses 7620 that extend circumferentially and are located on opposite sides of the collar 7520. The cushion module 2020 includes a corresponding pair of protrusions 7622 that engage with the recesses 7620 in a snap-fit ​​or interlocking manner. In other configurations, the mask frame 2030 and cushion module 2020 can include fewer (e.g., a single) or more recesses 7620 and protrusions 7622. The interlocking connection of the recesses 7620 and protrusions 7622 provides a retention force that tends to inhibit or prevent unintended separation of the cushion module 2020 from the mask frame 2030. Furthermore, the recesses 7620 and protrusions 7622 may provide feedback (e.g., tactile or audible feedback) to the user that the connection between the cushion module 2020 and the mask frame 2030 is complete, and / or may inhibit or prevent relative rotation between the cushion module 2020 and the mask frame 2030.

[0141] In some configurations, the mask assembly 7500 includes alignment features that facilitate proper rotational alignment of the cushion module 2020 and the mask frame 2030. In some configurations, the alignment features can also inhibit or prevent relative rotation between the cushion module 2020 and the mask frame 2030. Referring to FIG. 84 , the collar 7520 of the illustrated mask frame 2030 includes a recess 7526 configured to receive a corresponding protrusion 7528 of the cushion module 2020. However, this configuration can be reversed so that the protrusion is located on the mask frame 2030 and the recess is located on the cushion module 2020.

[0142] In the illustrated configuration, the sides of the protrusions 7528 contact corresponding sides of the recesses 7526 to limit rotation of the cushion module 2020 relative to the mask frame 2030. The outer shape defined by at least the sides of the protrusions 7528 substantially corresponds to the size and shape defined by at least the sides of the recesses 7526 so that any significant relative rotational movement is prevented. However, in other configurations, a gap may be provided between the protrusions 7528 and the recesses 7526 to allow some amount of rotation. In the illustrated configuration, the recesses 7526 and the protrusions 7528 each have a generally trapezoidal shape in the circumferential direction or a shape that tapers in width in a rear-to-front direction so that the recesses 7526 act as lead-ins for the protrusions 7528 for easy assembly.

[0143] In some configurations, the forward-facing surface of the protrusion 7528 contacts the rear-facing surface of the recess 7526 when the cushion module 2020 is properly assembled to the mask frame 2030. With such a configuration, the contact between the forward-facing surface of the protrusion 7528 and the rear-facing surface of the recess 7526 can provide an indication or feedback (e.g., tactile or audible feedback) to the user that the connection is complete. Additionally or alternatively, other portions of the cushion module 2020 and mask frame 2030 can contact upon complete assembly, such as, for example, the forward-facing peripheral surfaces of the cylindrical wall 7524.

[0144] Features of each mask assembly or portion thereof disclosed herein can be utilized with other mask assemblies or portions thereof disclosed herein. For example, directional locks, including manually or intentionally releasable locks, etc., can be utilized on any strap (e.g., top or bottom straps, single-sided or double-sided straps) or other portions of the headgear configuration or the entire mask assembly to allow adjustment of the length of the headgear portion or the overall closed-loop ("circumferential") dimension of the mask assembly. Any of the disclosed release or release mechanisms can be employed with any of the directional locks or other controllable lock types in any of the disclosed or other suitable locations within the headgear or mask assembly. Furthermore, in some configurations, each directional lock (or other lock or adjustment mechanism) can include 2-6 locking elements or lock washers and / or can exert a locking force of approximately 2-8 Newtons. In other configurations, each directional lock (or other lock or adjustment mechanism) can include 3-5 locking elements or lock washers and / or can exert a locking force of approximately 4-6 Newtons.

[0145] Unless otherwise clearly required by context, throughout the specification and claims, words such as "comprise," "comprising," and the like should be interpreted in an inclusive sense, i.e., "including but not limited to," as opposed to an exclusive or exhaustive sense. In particular, conditional language used herein, such as "can," "could," "might," "may," "for example," and the like, is intended to generally suggest that some embodiments include certain features, elements, and / or conditions, while other embodiments do not, unless specifically stated otherwise or understood otherwise within the context in which it is used. Thus, such conditional language is generally not intended to suggest that features, elements, and / or conditions are in any way required by one or more embodiments, or that one or more embodiments necessarily include logic that determines whether or not those features, elements, and / or conditions should be included in or implemented in any particular embodiment, with or without authorial input or direction.

[0146] The term "plurality" refers to two or more elements. Enumerations of quantities, dimensions, sizes, formulations, parameters, shapes, and other characteristics should be interpreted as if the term "about" or "approximately" preceded such quantity, dimension, size, formulation, parameter, shape, or other characteristic. The term "about" or "approximately" means that the quantity, dimension, size, formulation, parameter, shape, and other characteristic need not be exact and may be approximated and / or larger or smaller, as appropriate, reflecting acceptable tolerances, conversion factors, rounding, measurement errors, etc., and other factors known to those of ordinary skill in the art. Enumerations of quantities, dimensions, sizes, formulations, parameters, shapes, and other characteristics should also be interpreted as if the term "substantially" preceded such quantity, dimension, size, formulation, parameter, shape, or other characteristic. The term "substantially" means that the enumerated characteristic, parameter, or value need not be achieved exactly, but rather that deviations or variations, including, for example, tolerances, measurement errors, measurement accuracy limits, and other factors known to those of ordinary skill in the art, may occur in an amount that does not eliminate the effect the characteristic is intended to provide.

[0147] Numerical data may be expressed or presented herein in a range format. It will be understood that such range format is used merely for convenience and brevity, and thus should be interpreted flexibly to include not only the numerical values ​​explicitly recited as the upper and lower limits of the range, but also to include all individual numerical values ​​or subranges subsumed within that range, as if each numerical value and subrange were explicitly recited. By way of illustration, a numerical range of "1 to 5" should be interpreted not only to include the explicitly recited values ​​of about 1 to about 5, but also to include each individual value and subrange within the stated range. Thus, included within this numerical range are individual values ​​such as 2, 3, and 4, as well as subranges such as "1 to 3," "2 to 4," and "3 to 5." This same principle should apply to ranges reciting only a single numerical value (e.g., "greater than 1"), regardless of the breadth or described characteristics of the range.

[0148] For convenience, several items may be presented in common lists. However, these lists should be construed as though each member of the list is individually identified as a separate and unique element. Accordingly, no individual element of such lists should be construed as a de facto equivalent of any other element of the same list solely based on being presented in a common group, unless otherwise indicated. Furthermore, the terms "and" and "or," when used in conjunction with a list of items, should be interpreted broadly in that any one or more of the listed items can be used alone or in combination with the other listed items. The term "alternatively" refers to the selection of one of two or more options and is not intended to limit the selection to only those options listed at a time or to only one of the listed options, unless the context clearly dictates otherwise.

[0149] The reference in this specification to any prior art is not, and should not be construed as, an acknowledgment or any form of suggestion that that prior art forms part of the common general knowledge in the field of endeavor in any country in the world.

[0150] Where the above description refers to whole entities or components that have known equivalents, those whole entities are incorporated herein as if individually set forth.

[0151] The invention may be broadly said to consist in the parts, elements and features referred to or shown individually or collectively in the specification of this application, and in any or all combinations of two or more of said parts, elements or features.

[0152] It should be noted that various variations and modifications to the presently preferred embodiments described herein will become apparent to those skilled in the art. Such variations and modifications can be made without departing from the spirit and scope of the present invention and without diminishing its attendant advantages. For example, various components can be rearranged as needed. Accordingly, such variations and modifications are intended to be included within the scope of the present invention. Moreover, not all features, aspects, and advantages are necessarily required to practice the present invention. Accordingly, the scope of the present invention is intended to be defined solely by the following claims.

Claims

1. A directional locking assembly for respiratory mask headgear, the headgear including at least one strap including a core member, the directional locking assembly having an engaged configuration and a disengaged configuration with respect to the core member; Housing and first and second locking elements; the housing includes a first end wall, a second end wall, a first side wall, and a second side wall, the side wall extending between the end walls; the housing further includes first and second chambers configured to accommodate the first and second locking elements, respectively; the first end wall, the second end wall, and the first and second locking elements have openings for the core member to pass through, the openings in the first end wall and the second end wall being aligned with one another; each of the first and second chambers including a pair of locking element retainers aligned with opposing side walls of the housing and configured to pivotally retain the first and second locking elements within the respective first or second chamber; the first and second locking elements are configured to pivot between a first position and a second position; In the first position, the first end wall, the second end wall, and the openings in the first and second locking elements are aligned and movement of the core member through the directional locking assembly along the direction of elongation of the strap is not restricted; and in the second position, the path of the core member through the directional locking assembly is non-linear or tortuous and movement of the core member through the directional locking assembly along the direction of elongation of the strap is restricted; a release member movable between an inactivated position and an activated position; when the release member is in the inactivated position, the release member does not prevent the first and second locking elements from moving between the first position and the second position; When the release member is in the actuated position, the release member prevents the first and second locking elements from moving and holds the first and second locking elements in the first position. Directional lock assembly.

2. 2. The directional locking assembly of claim 1, wherein when the first and second locking elements are in the second position, the first and second locking elements apply a first frictional force to the core member to limit movement of the core member, and when the first and second locking elements are in the first position, the first and second locking elements apply a second frictional force to the core member that is less than the first frictional force, or the locking elements apply no frictional force to the core member.

3. 2. The directional locking assembly of claim 1, wherein application of a force to the core member causes the first and second locking elements to pivot between the first position and the second position.

4. 2. The directional locking assembly of claim 1, wherein the first and second chambers are separated by an inner wall of the housing, the inner wall also having an opening for passage of the core member therethrough, the opening in the inner wall and the openings in the first and second end walls being aligned with one another.

5. The directional locking assembly of claim 1 , wherein the first and second chambers are configured to open at one or both of the top and bottom of the housing.

6. 2. The directional locking assembly of claim 1, wherein each of the first and second locking elements includes a shaft and an arm extending from the shaft, the arm including a first section and a second section, the first section extending radially or perpendicularly from the shaft, and the second section extending at an obtuse angle from an end of the first section.

7. The directional locking assembly of claim 1 , further comprising a biasing element configured to bias the release member toward the inactivated position.

8. The directional locking assembly of claim 7 , wherein the biasing element is a spring.

9. 2. The directional locking assembly of claim 1, wherein the release member has a body portion and one or more tabs or arms extending from the body portion, the release member being configured to retain the first and second locking elements in the first position when the tabs or arms are engaged with the first or second locking elements.

10. 10. The directional locking assembly of claim 9, wherein the release member is coupled to a release element, the tab or arm of the release member configured to engage the first and second locking elements upon manipulation of the release element by a user.

11. The directional locking assembly of claim 9 , wherein the first locking element and the second locking element each include one or more protrusions for engagement with the tab or arm of the release member.

12. The directional locking assembly of claim 10 , wherein the release element is a handle, a bar, a button, or a lever.

13. 11. The directional locking assembly of claim 10, wherein the release element is a handle, and the release member is configured such that a user pulls the handle away from the user's face to effect engagement between the tab or arm and the first and second locking elements.

14. The directional locking assembly of claim 10 , wherein the release member is coupled to the release element via a connecting member.

15. 15. Headgear for a respiratory mask, the headgear comprising a head engaging portion, a mask engaging portion, and at least one strap extending between the head engaging portion and the mask engaging portion, the headgear comprising the directional locking assembly of any one of claims 1 to 14.

16. 16. A mask assembly including the headgear of claim 15, The frame and a cushion module comprising a housing and a seal; Mask containing Including, a mask assembly, wherein the mask comprises a connection arrangement configured to connect the cushion module to the frame, the connection arrangement including at least one protrusion located on one of the cushion module and the frame and at least one recess located on the other of the cushion module and the frame, the at least one protrusion configured to engage with the at least one protrusion to secure the cushion module to the frame.

17. 17. The mask assembly of claim 16, wherein the mask-engaging portion of the headgear comprises a yoke configured to connect the headgear to the mask.

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