Respiration tube assembly with adjustable elbow

Abstract

To provide a respiratory therapy system and a respiration tube assembly to cope with at least one defects of prior arts.SOLUTION: A respiration tube assembly for use with the respiratory therapy system, such as a continuous positive airway pressure (CPAP) device, includes an elbow that permits adjustment of a position of the respiration tube assembly relative to the respiratory therapy system. In some layout constitution example, the respiration tube assembly includes a respiration tube and a swivel elbow. The respiration tube is rotationally fixed relative to the respiratory therapy system, and the swivel elbow is rotatable relative to the respiration tube. In another layout constitution example, the respiration tube assembly includes an elbow which can be coupled with the respiratory therapy system, at one of some possible positions.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates generally to a respiratory therapy system and a breathing tube assembly for use with the respiratory therapy system, and more particularly to an elbow for a breathing tube assembly that allows adjustment of the breathing tube assembly relative to an associated therapy device. [Background technology]

[0002] Respiratory therapy systems and devices, including continuous positive airway pressure (CPAP) systems and devices, flow therapy systems and devices, and breathing tube assemblies for use with such devices, are well known in the art. Additionally, breathing tube assemblies that allow the position of a breathing tube relative to a respiratory therapy device to be adjustable are known in the art. However, existing adjustable breathing tube assemblies are often complex to manufacture, which results in higher costs and often a shorter service life than non-adjustable assemblies. Summary of the Invention [Problem to be solved by the invention]

[0003] As a result, a need exists for a respiratory therapy system and breathing tube assembly that addresses one or more of the shortcomings of the prior art. In particular, one or more embodiments of the present invention provide for adjustment of a breathing tube assembly relative to a respiratory therapy device in an assembly that can be cost-effectively manufactured and that provides a similar or longer service life compared to non-adjustable or prior art adjustable assemblies. [Means for solving the problem]

[0004] A respiratory therapy system and breathing tube assembly for use with a respiratory therapy system, such as a CPAP system, of a preferred embodiment includes an elbow that allows adjustment of the position of the breathing tube assembly relative to the respiratory therapy device. In some example arrangements, the breathing tube assembly includes a breathing tube and a swivel elbow. The breathing tube is rotationally fixed relative to the respiratory therapy device and the swivel elbow is rotatable relative to the breathing tube. In other example arrangements, the breathing tube assembly includes an elbow that can be coupled to the respiratory therapy device in one of several possible positions.

[0005] A preferred embodiment relates to a respiratory therapy system including a flow generator, a flexible breathing tube assembly, a patient interface, and a swivel elbow. The flow generator generates a flow of breathing gas and includes an outlet for the flow of breathing gas. The flexible breathing tube assembly includes a connector and a tube having a first end and a second end. The first end is substantially non-rotatably coupled to the connector. The connector couples the breathing tube to the outlet of the flow generator. The patient interface is coupled to the second end of the breathing tube to enable the breathing tube to deliver the flow of breathing gas from the flow generator to the patient interface. The swivel elbow is rotatably coupled to the connector of the breathing tube. The swivel elbow includes an engagement portion that at least partially surrounds the breathing tube to couple the swivel elbow to the breathing tube. The swivel elbow further includes a curved portion that directs the first portion of the breathing tube into a curved shape. The breathing tube is rotatable relative to the mating portion of the swivel elbow, allowing the swivel elbow to be rotatable relative to the connector to change the direction in which the breathing tube extends relative to the flow generator.

[0006] In some arrangements, the swivel elbow is more resistant to deformation than the breathing tube, and in use, the swivel elbow prevents the breathing tube from being collapsed by an external force resulting in occlusion of the breathing tube. The engagement portion may completely surround the breathing tube. The engagement portion may only partially surround the breathing tube, thereby defining a slit in the engagement portion.

[0007] In some example arrangements, the curved portion extends between the portion of the swivel elbow coupled to the connector and the engagement portion. The curved portion may subtend an angle of approximately 90 degrees along the length of the breathing tube. The curved portion may circumferentially surround approximately half of the breathing tube. The curved portion may be located on an inner or outer portion of the curved shape. The swivel elbow may also include a tab sized and shaped to facilitate gripping by a user. The tab may be located generally opposite the curved portion or the engagement portion. The swivel elbow may be comprised of a pair of interlocking halves.

[0008] In some example arrangements, the connector includes a first interface surface portion and the flow generator includes a second interface surface portion, such that when the breathing tube is coupled to the flow generator, the second interface surface portion engages the first interface surface portion to secure the breathing tube to the flow generator. The second interface surface portion is defined by an outlet of the flow generator, and the first interface surface portion is defined by a portion of the connector housed within the outlet. The second interface surface portion can be adjacent to the outlet of the flow generator, and the first interface surface portion can be defined by a portion of the connector adjacent to the outlet. The first interface surface portion can be defined by a tab on the connector, which can engage a corresponding recess on the flow generator. The second interface surface portion can be defined by at least one tab on the flow generator, which can engage an external shoulder of the swivel elbow that defines the first interface surface portion.

[0009] In some example arrangements, the connector includes a first electrical terminal configured to connect to a second electrical terminal on the flow generator. The first and second electrical terminals can connect a heat source on the flow generator to a heating coil on the breathing tube. Alternatively or additionally, the first and second electrical terminals provide data communication between the breathing tube and the flow generator.

[0010] An embodiment relates to a breathing tube assembly including a flexible breathing tube that may be coupled to a flow generator to receive a flow of breathing gas from the flow generator and coupled to a patient interface to deliver a flow of breathing gas to the patient interface. A swivel elbow engages a portion of the breathing tube. The swivel elbow includes a curved portion that directs the portion of the breathing tube into a curved shape. The swivel elbow is rotatable relative to the flow generator and also rotatable relative to the portion of the breathing tube such that the swivel elbow may be rotated relative to the flow generator to change the direction in which the breathing tube extends relative to the flow generator.

[0011] In some example arrangements, the curved portion of the swivel elbow contacts the exterior surface of the breathing tube. The curved portion may be at an angle of about 90 degrees along the length of the breathing tube. The curved portion may circumferentially surround approximately half of the breathing tube. The curved portion may be located on the inner or outer portion of the curved shape. The swivel elbow may also include a tab sized and shaped to facilitate gripping by a user. The tab may be located approximately opposite the curved portion or the portion of the swivel elbow that at least partially surrounds the breathing tube. The swivel elbow may be comprised of a pair of interlocking halves.

[0012] In some example arrangements, the connector includes a first interface surface portion and the flow generator includes a second interface surface portion, such that when the breathing tube is coupled to the flow generator, the second interface surface portion engages the first interface surface portion to secure the breathing tube to the flow generator. The second interface surface portion may be defined by an outlet of the flow generator, and the first interface surface portion may be defined by a portion of the connector housed within the outlet. The second interface surface portion may be adjacent to the outlet of the flow generator, and the first interface surface portion may be defined by a portion of the connector adjacent to the outlet. The first interface surface portion may be defined by a tab on the connector, which may engage a corresponding recess on the flow generator. The second interface surface portion may be defined by at least one tab on the flow generator, which may engage an external shoulder of the swivel elbow that defines the first interface surface portion.

[0013] In some example arrangements, the connector includes a first electrical terminal configured to connect to a second electrical terminal on the flow generator. The first and second electrical terminals can connect a heat source of the flow generator to a heating coil of the breathing tube. Alternatively or additionally, the first and second electrical terminals can provide data communication between the breathing tube and the flow generator.

[0014] The embodiment relates to a respiratory therapy system including a flow generator, a flexible breathing tube assembly, and a patient interface. The flow generator generates a flow of breathing gas and includes an outlet for the flow of breathing gas. The flow generator also includes a first electrical terminal and a second electrical terminal. The flexible breathing tube assembly includes a tube and a connector. The tube has a first end and a second end. The first end of the tube is coupled to the connector. The connector couples the breathing tube assembly to the outlet of the flow generator. The connector has an electrical terminal of the tube that is connectable to either the first electrical terminal or the second electrical terminal of the flow generator. The patient interface is coupled to the second end of the tube to enable the breathing tube assembly to deliver the flow of breathing gas from the flow generator to the patient interface. The breathing tube assembly is connectable to the flow generator in a first position where the electrical terminal of the tube is coupled to the first electrical terminal of the flow generator, and in a second position where the electrical terminal of the tube is coupled to the second electrical terminal of the flow generator.

[0015] In some example arrangements, the outlet of the flow generator defines an outlet axis, and the first end of the tube defines a tube axis, and the connector orients the tube axis at an angle relative to the outlet axis in each of the first and second positions. The angle may be approximately 90 degrees. The tube may extend in a first direction when the breathing tube assembly is in the first position, and in a second direction when the breathing tube assembly is in the second position, the second direction being opposite the first direction.

[0016] In some example arrangements, the connector includes a first interface surface portion and the flow generator includes a second interface surface portion, such that when the breathing tube is coupled to the flow generator, the second interface surface portion engages the first interface surface portion to secure the breathing tube to the flow generator. The second interface surface portion may be defined by an outlet of the flow generator, and the first interface surface portion may be defined by a portion of the connector housed within the outlet. The first interface surface portion may be defined by a tab on the connector, which may engage a corresponding recess on the flow generator.

[0017] In some example arrangements, the first and second electrical terminals and the tubing electrical terminals connect a heat source of the flow generator to a heating coil of the breathing tube. Alternatively or additionally, the first and second electrical terminals and the tubing electrical terminals can provide data communication between the breathing tube and the flow generator.

[0018] These and other features, aspects and advantages of the breathing tube assembly with elbow are disclosed herein with reference to the drawings of the preferred embodiments, which are provided for purposes of illustration and not limitation, and which include 30 views. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a perspective view of a flow generator and a breathing tube assembly including a tube, a connector and a swivel elbow. [Diagram 2] FIG. 2 is a perspective view of the breathing tube assembly of FIG. 1 separated from the flow generator. [Diagram 3] FIG. 3 is a perspective view of the breathing tube assembly of FIG. 2 with the swivel elbow separated from the tube and connector. [Figure 4] 4 is a cross-sectional view of the flow generator and breathing tube assembly of FIG. 1 taken along line 4-4 of FIG. 1. [Diagram 5] FIG. 13 is a perspective view of a flow generator and an alternative breathing tube assembly including a tube, a connector and a swivel elbow. [Figure 6] FIG. 6 is a perspective view of the breathing tube assembly of FIG. 5 separated from the flow generator. [Figure 7] FIG. 7 is a perspective view of the breathing tube assembly of FIG. 6 with the swivel elbow separated from the tube and connector. [Figure 8] 8 is a cross-sectional view of the flow generator and breathing tube assembly of FIG. 5 taken along line 8-8 of FIG. 5. [Figure 9] FIG. 13 is a perspective view of a flow generator and yet another alternative breathing tube assembly including a tube, a connector and a swivel elbow. [Figure 10] FIG. 10 is a perspective view of the breathing tube assembly of FIG. 9 separated from the flow generator. [Figure 11] FIG. 11 is a perspective view of the breathing tube assembly of FIG. 10 with the swivel elbow separated from the tube and connector. [Figure 12] 12 is a cross-sectional view of the flow generator and breathing tube assembly of FIG. 9 taken along line 12-12 of FIG. 9. [Figure 13] FIG. 13 is a perspective view of an alternative swivel elbow including relatively small longitudinally extending slits at each end of the elbow. [Figure 14] FIG. 14 is a perspective view of yet another alternative swivel elbow including a larger slit compared to the swivel elbow of FIG. [Figure 15] FIG. 13 is a perspective view of another alternative swivel elbow omitting one of the loop end portions of the previous swivel elbow. [Figure 16] FIG. 1 is a perspective view of a flow generator and an alternative breathing tube assembly including a tube and an elbow connector. The flow generator includes a first electrical terminal and a second electrical terminal. The breathing tube assembly includes a tube electrical terminal that connects to the first electrical terminal at a first location of the breathing tube assembly and connects to the second electrical terminal at a second location of the breathing tube assembly. The elbow connector includes an interlocking arrangement to selectively secure the breathing tube assembly to the flow generator. [Figure 17] FIG. 17 is a perspective view of the breathing tube assembly of FIG. 16 separated from the flow generator. [Figure 18] 18 is a cross-sectional view of the flow generator and breathing tube assembly of FIG. 16 taken along line 18-18 of FIG. 16. [Figure 19] FIG. 19 is a perspective view of a flow generator and an alternative breathing tube assembly for the assembly of FIGS. 16-18. [Figure 20] FIG. 20 is a perspective view of the breathing tube assembly of FIG. 19 separated from the flow generator. [Figure 21] 21 is a cross-sectional view of the flow generator and breathing tube assembly of FIG. 19 taken along line 21-21 of FIG. 19. [Figure 22] FIG. 22 is a perspective view of a flow generator and another alternative breathing tube assembly for the assemblies of FIGS. 16-21. [Diagram 23] FIG. 23 is a perspective view of the breathing tube assembly of FIG. 22 separated from the flow generator. [Figure 24] 24 is a cross-sectional view of the flow generator and breathing tube assembly of FIG. 22 taken along line 24-24 of FIG. 22. [Diagram 25] FIG. 25 is a perspective view of a flow generator and yet another alternative breathing tube assembly for the assemblies of FIGS. 16-24. [Figure 26] FIG. 26 is a perspective view of the breathing tube assembly of FIG. 25 separated from the flow generator. [Figure 27] 27 is a cross-sectional view of the flow generator and breathing tube assembly of FIG. 25 taken along line 27-27 of FIG. 25. [Figure 28] FIG. 28 is a perspective view of a flow generator and an alternative breathing tube assembly similar to the breathing tube assemblies of FIGS. 1 to 15. The breathing tube assembly of FIG. 28 includes a tube, a connector and a swivel elbow. [Figure 29] FIG. 29 is a perspective view of the inside of the breathing tube assembly of FIG. 28, separated from the flow generator. [Diagram 30] FIG. 29 is a perspective view of the exterior of the breathing tube assembly of FIG. 28, separated from the flow generator. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] The respiratory therapy system, breathing tube assembly and related components are described herein in the context of a healthcare breathing device that provides breathing gas at or above a minimum pressure or flow, preferably at an elevated pressure compared to atmospheric pressure. In particular, the illustrated respiratory therapy system is a continuous positive airway pressure (CPAP) device that provides breathing gas (e.g., air) at or above a minimum pressure. The pressure level may be constant or variable. Examples of suitable CPAP devices include the ICON™ Series or SleepStyle™ Series CPAP devices sold by Fisher & Paykel Healthcare. However, the disclosed system, breathing tube assembly and related components may also be used in other contexts or applications. For example, the system, breathing tube assembly and related components may be used in, among other things, adult, pediatric or infant respiratory systems, and surgical humidification systems. Thus, as used herein, the terms "humidifier", "humidification device", or "CPAP device" are intended to encompass other types of flow generators, humidified or non-humidified.

[0021] 1-4 illustrate a respiratory therapy system 100 that preferably provides a flow of breathing gas (e.g., air) at positive pressure to a patient interface 102 to treat obstructive sleep apnea, among other use cases. The system 100 includes a flow generator 104, preferably a CPAP device, as described above, that generates a flow of humidified breathing gas, e.g., air. The CPAP device 104 preferably includes an internal water reservoir (not shown), a heating device that heats the water in the reservoir, and a blower or pump (not shown) that generates a flow of air. The air flow passes through the reservoir to increase the humidity of the air flow, and the humidified air flow is delivered to an outlet 106 (FIG. 4). In other arrangements, the flow generator 104 can provide a flow of non-humidified breathing gas, which can be air or other suitable gas.

[0022] A conduit or breathing tube assembly 110 is coupled at one end to the outlet 106 and at the other end to the patient interface 102 to deliver the humidified airflow from the outlet 106 to the patient interface 102. The patient interface 102 may be any suitable type of interface capable of delivering the airflow to the patient's respiratory system. The illustrated patient interface 102 is a nasal mask that covers the patient's nose but not the patient's mouth. Other suitable patient interfaces include, for example, without limitation, full face masks, nasal cannulas, endotracheal or tracheotomy interfaces.

[0023] The breathing tube assembly 110 preferably includes a tube section or tube 112, a connector 114, and a swivel elbow 116. The tube 112 is a flexible tube that provides freedom of movement for the patient interface 102 relative to the CPAP device 104. That is, the tube 112 is preferably able to bend along its length without significant resistance to accommodate the movements of the user of the system 100 within the range of motion of the breathing tube assembly 110. The tube 112 may be connectable to the patient interface 102 by any suitable arrangement, such as, but not limited to, an interlocking or friction-fit arrangement. Preferably, the tube 112 includes an integrated electrical element or circuitry 120, which may be a heating circuit or heating coil, a data circuit, any other type of electrical element or circuitry, or any combination thereof. In the illustrated tube 112, the electrical element 120 is a spiral heating coil that is confined within the walls of the tube 112.

[0024] The connector 114 is coupled to the end of the tube 112 opposite the patient interface 102 and allows the breathing tube assembly 110 to be connected to the CPAP device 104. The connector 114 may be coupled to the end of the tube 112 in any suitable manner to create an airtight or substantially airtight connection therebetween. The connector 114 is preferably permanently coupled to the tube 112, but may likewise be removably coupled to the tube 112, if desired. The connector 114 is configured to be received within the outlet 106 of the CPAP device 104. In particular, the connector 114 preferably includes a flange portion or flange 122 and a shaft portion or shaft 124 extending from the flange 122 in a direction opposite the tube 112. The shaft 124 is hollow and defines an interior passageway 126 in communication with the interior passageway of the tube 112. In the illustrated arrangement, the shaft 124 of the connector 114 is received within the outlet 106 of the CPAP device 104; however, in other arrangements, the connector 114 may define a female portion of the connection and the outlet 106 may define a male portion.

[0025] Preferably, when the breathing tube assembly 110 is assembled to the CPAP device 104, the flange 122 abuts the outer surface of the CPAP device 104. The flange 122 also has an electrical terminal that engages a complementary electrical terminal of the CPAP device 104 to allow electrical signals or energy to be transferred between the CPAP device 104 and the breathing tube assembly 110. In the illustrated arrangement, the electrical terminal of the connector 114 is a plug 130 and the electrical terminal of the CPAP device 104 is a receptacle or port 132 (FIG. 8). However, this arrangement can also be reversed if desired. The plug 130 is electrically connected to the heating coil 120 and / or other electrical elements of the breathing tube assembly 110. The port 132 is electrically connected to the heating circuit and / or other electrical circuit of the CPAP device 104. Preferably, the heating circuit of the CPAP device 104 provides electrical energy to the heating coil 120 of the breathing tube assembly 110 so that the heating coil 120 can provide heat energy to the flow of humidified air passing through the breathing tube assembly 110. As is known, such an arrangement can prevent or limit condensation within the breathing tube assembly 110. Additionally or alternatively, the plug 130 and port 132 can provide other electrical signals, such as data signals, to be communicated between the CPAP device 104 and the breathing tube assembly 110. For example, a sensor at the patient interface end of the breathing tube assembly 110 can provide data regarding one or more parameters of the air flow (e.g., temperature, humidity level) for use by the control system of the CPAP machine. Any other desired electrical signals can also be communicated.

[0026] Preferably, the connector 114 includes features that facilitate insertion of the connector 114 into and / or retention of the connector 114 within the outlet 106 of the CPAP device 104. For example, the shaft 124 of the connector 114 may include a guide rib 134 extending longitudinally of the shaft 124. The guide rib 134 may engage a complementary groove (not shown) in the outlet 106 to aid in the insertion of the connector 114 into the outlet 106 by properly aligning the plug 130 with the port 132. Additionally or alternatively, the length of the guide rib 134 and the plug 130 may be longer compared to the exemplary arrangement shown in FIGS. 1-4. For example, the length of the plug 130 may be between about 3 / 4 the length of the shaft 124 and about the same length as the shaft 124, or may be longer. In such an exemplary arrangement, the plug 130 readily engages the port 132 and aids in proper alignment and insertion of the connector 114 into the outlet 106. In the illustrated arrangement, the guide rib 134 is disposed opposite the plug 130 .

[0027] The connector 114 also preferably includes features that facilitate retention of the connector 114 to the CPAP device 104. In some arrangements, the interlocking arrangement between the connector 114 and the CPAP device 104 is a feature. In the illustrated arrangement, the shaft 124 includes a protrusion 136 that defines an interference or interlocking surface. The outlet 106 includes a complementary recess 140 that also defines an interference or interlocking surface. When the connector 114 is coupled to the CPAP device 104, the protrusion 136 is received within the recess 140, and the interaction between their respective interference surfaces creates a retention force that tends to prevent unwanted separation of the connector 114 from the CPAP device 104. In some arrangements, the positions of the protrusion 136 and the recess 140 may be reversed. The illustrated protrusion 136 and the recess 138 are elongated and extend circumferentially of the shaft 124 and the outlet 106, respectively. Additionally, preferably, two or more protrusion / recess pairs 136 / 140 are provided. In the example arrangement shown, two pairs of corresponding projections 136 and recesses 140 are provided and are equally spaced about the circumference of the shaft 124. While this arrangement of projections 136 and recesses 140 is preferred, other suitable types of interlocking or interference configurations may be used.

[0028] Preferably, the breathing tube assembly 110 includes one or more features, such as orienting a portion of the breathing tube 112 into a curved shape and / or providing a crush-resistant feature to a portion of the breathing tube 112. Also, preferably, the breathing tube 112 can be moved relative to the CPAP device 104 so that the breathing tube 112 can be oriented in at least two different positions, preferably any position within a range of possible positions. In some arrangements, the portion of the breathing tube 112 that is oriented into a curved shape and / or provided with a crush-resistant feature is a portion of the tube 112 adjacent the connector 114. In some cases, the outlet 106 is positioned on a rear face of the CPAP device 104 (e.g., relative to a front face defined by a user interface or otherwise). Therefore, it is often desirable to bend the breathing tube 112 at or near the connector 114 / outlet 106 to reduce the space required to accommodate the breathing tube 112 on the outlet side (e.g., rear face) of the CPAP device 104. Additionally, positioning the outlet 106 backwards (or otherwise) creates a risk that the CPAP device 104 will be pushed toward a wall or other object until the breathing tube 112 is crushed against the wall or other object, which may cause partial or complete blockage and / or damage to the breathing tube 112. Therefore, it is often desirable to provide some degree of protection to the breathing tube 112, particularly the portion of the breathing tube 112 at or near the outlet 106. The CPAP device 104 may also be positioned on either side of the patient / user. Therefore, it is often desirable to be able to adjust (e.g., rotate) the breathing tube 112 relative to the CPAP device 104 as well. In the illustrated arrangement, the swivel elbow 116 provides each of the above-mentioned features. That is, the illustrated swivel elbow 116 forces the tube 112 into a curved shape, provides an anti-collapse function, and allows the position of the tube 112 relative to the CPAP device 104 to be changed. However, in other example arrangements, the swivel elbow 116 does not provide all of these features. For example, the swivel elbow 116 may provide any one or combination of the features described above.

[0029] Preferably, the swivel elbow 116 urges, guides, restrains, or otherwise directs a portion of the tube 112 into a curved shape or orientation. Preferably, the curved portion of the tube 112 is near or adjacent to the connector 114. The illustrated swivel elbow 116 includes a first portion or connector-engaging portion 142 that contacts and preferably engages the connector 114. The swivel elbow 116 also includes a second portion or tube-engaging portion 144 that contacts and preferably engages the tube 112. In the illustrated arrangement, the connector-engaging portion 142 and the tube-engaging portion 144 are in the form of a band and substantially or entirely surround the circumference of the connector 114 and / or the tube 112. In an alternative arrangement, the swivel elbow 116 may instead be coupled to the CPAP device 104 but retain some or all of the functionality described herein.

[0030] The swivel elbow 116 further includes a tube guide portion 146 extending between the connector engaging portion 142 and the tube engaging portion 144. Preferably, the tube guide portion 146 defines a curved surface 150 to guide the tube 112 into a curved configuration. As a result, the axis of the connector engaging portion 142 is offset at an angle relative to the axis of the tube engaging portion 144. In the illustrated arrangement, the angle is approximately 90 degrees. However, in other arrangements, the angle may be any angle within the range of approximately 45 degrees to approximately 180 degrees. The angle may also be outside of this range, if desired. In some arrangements, the angle may be adjustable, for example, by providing a pivot on the swivel elbow 116. Preferably, at least a portion of curved surface 150 contacts tube 112; however, tube guide portion 146 may also be configured to simply interconnect connector engaging portion 142 and tube engaging portion 144, thereby directing tube 112 into a curved shape with little or no contact between tube 112 and tube guide portion 146. Additionally, while connector engaging portion 142, tube engaging portion 144, and tube guide portion 146 are external to tube 112, in alternative arrangements, one or more of these structures may be internal to tube 112.

[0031] Also, preferably, the swivel elbow 116 provides at least some degree of crush protection for the tube 112. Therefore, preferably, the swivel elbow 116, or at least the tube guide portion 146, is constructed from a material that is stiffer than the tube 112 or has a higher resistance to bending compared to the tube 112. While relatively stiff plastic, metal or other materials may be used, a preferred embodiment is constructed from plastic. Preferably, the tube guide portion 146 is capable of maintaining its shape in response to crushing forces expected in normal use of the system 100. The tube guide portion 146 may completely surround the circumference of the tube 112; however, in the illustrated arrangement, the tube guide portion 146 only partially surrounds the tube 112. Notably, the illustrated tube guide portion 146 surrounds approximately or exactly half of the circumference of the tube 112. Preferably, tube guide portion 146 is positioned outside tube 112 relative to the bend (e.g., the center point of the bend radius) and positioned so that tube guide portion 146 contacts a wall or other object instead of tube 112, thereby reducing the likelihood that tube 112 will become partially or completely blocked. As discussed above, tube guide portion 146 may be internal or external to tube 112.

[0032] Preferably, the swivel elbow 116 is rotatable about at least the longitudinal axis of the outlet 106 of the CPAP device 104, allowing the position of the tube 112 to be altered relative to the CPAP device 104. In the illustrated arrangement, the swivel elbow 116 may be rotated 360 degrees or more about the axis of the outlet 106. That is, the swivel elbow 116 may be rotated in one direction for multiple rotations. However, in other arrangements, the rotation of the swivel elbow 116 may be limited, either as a result of the configuration of the elbow 116 or as a result of interference with other components / objects. For example, the rotation of the swivel elbow 116 may be less than 45 degrees, more than 45 degrees, more than 180 degrees, or more than 270 degrees, among other possibilities.

[0033] As discussed above, the swivel elbow 116 may be coupled to the connector 114. In the example arrangement shown, the connector engaging portion 142 receives a boss 152 of the connector 114 that extends from the flange 122 in a direction opposite the shaft 124. However, this arrangement may be reversed, and the connector engaging portion 142 may be received within the boss 152, among other possible connection arrangements. Preferably, the interlocking arrangement secures the connector engaging portion 142 axially to the boss 152, but allows rotation therebetween. The interlocking arrangement shown includes a circumferential projection 154 defined by one of the connector engaging portion 142 and the boss 152, and a complementary circumferential groove 156 defined by the other of the connector engaging portion 142 and the boss 152. In the example arrangement shown, the projection 154 is defined by the boss 152, and the groove 156 is defined by the connector engaging portion 142; however, this arrangement may be reversed. Additionally, the illustrated projection 154 is not continuous around the entire circumference of the boss 152. In particular, the illustrated projection 154 includes at least a pair, and preferably exactly a pair, of projection portions 154 that are equally spaced around the circumference of the boss 152. Additionally, other types of interlocking configurations may be used.

[0034] Preferably, the swivel elbow 116 is not coupled to the tube 112 and does not tightly surround the tube 112, thereby allowing relative rotation between the swivel elbow 116 and the tube 112. Preferably, the tube 112 is relatively loosely contained within the swivel elbow 116 such that a gap exists or may exist when centering the tube 112 relative to the swivel elbow 116, facilitating relative rotation therebetween. That is, the tube 112 preferably does not rotate relative to the outlet 106 of the CPAP device 104, but simply changes position depending on the flexibility of the tube 112. In some example arrangements, the gap between the tube 112 and the inner surface of the swivel elbow 116 may be in the range of about 0.05 to 0.1 millimeters. However, the gap may also be below or above this range. Because the swivel elbow 116 can rotate relative to the connector 114 and the tube 112 can slide or rotate within the swivel elbow 116, adjustment of the position of the tube 112 relative to the CPAP device 104 is permitted, with the swivel elbow 116 being able to orient the tube 112 in a desired direction. Advantageously, such an arrangement provides for adjustment of the position of the tube 112 relative to the CPAP device 104, while maintaining electrical connection between the electrical terminals 130 and 132 and providing a long service life, using a relatively simple structure that is cost-effective to manufacture. In an alternative arrangement, the swivel elbow 116 provides additional freedom of movement. For example, the swivel elbow 116 can be rotated (e.g., via a ball joint) about one or more axes perpendicular or substantially perpendicular to the axes of the outlet 106, shaft 124 and / or boss 152.

[0035] In use, the CPAP device 104 may be configured as usual, with the reservoir filled (if applicable), the device 104 plugged in, and the operating mode or parameters appropriately set. If necessary, the swivel elbow 116 may be assembled to the tube 112 and connector 114. For example, the swivel elbow 116 may be slid from the patient interface end of the tube 112 to the connector end of the tube 112 and coupled to the connector 114 via an interlocking arrangement. The patient interface 102 may be coupled to the tube 112, and the breathing tube assembly 110 may be coupled to the CPAP device 104 by coupling the connector 114 to the outlet 106. The swivel elbow 116 may be rotated (directly, or indirectly by moving the tube 112) to orient the tube 112 and patient interface 102 to a desired position (e.g., right, left, up or down) relative to the CPAP device 104, while maintaining the connection between the electrical terminals 130 and 132. The CPAP device 104 may then be used according to the desired protocol.

[0036] Figures 5-8 show another respiratory therapy system 100 that includes a breathing tube assembly 110, similar to system 100 of Figures 1-4. As a result, the same reference numbers are used to indicate corresponding or similar components, and only the differences from system 100 are described. Components, assemblies, or features that are not specifically described may be considered the same or similar to the same components, assemblies, or features of system 100 of Figures 1-4.

[0037] In the system 100 of Figures 5-8, the connector 114 includes an alternative interlocking configuration for securing the connector 114 to the CPAP device 104. In particular, in the illustrated interlocking configuration, the flange 122 of the connector 114 includes a resilient tab 200 that engages a corresponding recess 202 in the CPAP device 104. Preferably, the tab 200 is located opposite the electrical plug 130; however, other locations are possible. The length of the tab 200 is approximately the same as or somewhat longer than the length of the plug 130. Preferably, the tab 200 is shorter than the guide rib 134 (if present), which is preferably located midway between the tab 200 and the plug 130.

[0038] The tab 200 is preferably generally U-shaped and has a free end 204 and a fixed end 206 that are coupled to the flange 122 or to another portion of the connector 114. Preferably, the tab 200 is integral with the connector 114 and / or the flange 122. The closed end of the U-shaped tab 200 preferably extends away from the flange 122 in the same direction as the shaft 124. An interference surface is defined by a protrusion 136 disposed on a leg of the U-shaped tab 200, which leg in the illustrated arrangement is the leg that defines the free end 204. However, in some arrangements, the protrusion 136 can be positioned on the other leg or both legs. The free end 204 is movable such that the protrusion 136 can enter the recess 202 and then engage a corresponding interference surface defined by a space, opening, or recess 140 extending from the recess 202. In the illustrated arrangement, the interference surface is defined by the outer housing of the CPAP device 104, and the protrusions are received within a space behind the housing (interior of the CPAP device 104). The resilience of the U-shaped tab 200 maintains contact with the interference surface until the free end 204 is moved to disengage the interference surface and separate the connector 114 from the outlet 106. Preferably, the flange 122 defines a pair of prongs 210 to receive the tab 200 therebetween, protecting the tab 200 and preventing out-of-plane movement of the tab 200. In other respects, the system 100 and breathing tube assembly 110 of Figures 5-8 are similar in structure and operation to the system 100 and tube assembly 110 of Figures 1-4.

[0039] Figures 9-12 show another respiratory therapy system 100 that includes a breathing tube assembly 110 that is similar to system 100 of Figures 1-4 and 5-8. As a result, the same reference numbers are used to indicate corresponding or similar components, and only the differences from system 100 are described. Components, assemblies, or features that are not specifically described may be considered the same or similar to the same components, assemblies, or features of system 100 of Figures 1-4 or 5-8.

[0040] In the system 100 of Figures 9-12, an alternative interlocking arrangement is provided for securing the connector 114 to the CPAP device 104. In particular, in the illustrated interlocking arrangement, the swivel elbow 116 includes an annular portion 220 that surrounds all or a portion of the flange 122 of the connector 114. A transition between the connector engaging portion 142 and the annular portion 220 defines a shoulder 222 or interference surface. The CPAP device 104 includes at least one, and preferably a pair of resilient tabs 224 that engage the annular portion 220 of the swivel elbow 116 to axially secure the connector 114 and swivel elbow 116 to the CPAP device 104, but allow rotation between the swivel elbow 116 and the CPAP device 104. The connector 114 is preferably prevented from rotating relative to the CPAP device 104 by the plug 130 and / or other structure (e.g., guide ribs 134). The tab 224 includes a hook portion 226 that defines an interference surface that contacts one or more interference surfaces of the swivel elbow 116. In other respects, the system 100 and breathing tube assembly 110 of Figures 9-12 are similar in structure and operation to the system 100 and tube assembly 110 of Figures 1-4 or Figures 5-8.

[0041] Figures 13-15 show a swivel elbow 116 that is similar to the swivel elbow 116 of Figures 1-4, 5-8 and 9-12. As a result, the same reference numbers are used to indicate corresponding or similar components and only the differences to swivel elbow 116 are described. Features not specifically described may be considered the same or similar to the same or corresponding features of the swivel elbow 116 of Figures 1-4, 5-8 or 9-12.

[0042] The swivel elbow 116 of FIG. 13 includes a slit 230 in at least one of the connector-engaging portion 142 or the tube-engaging portion 144, and preferably each. As a result, the portions 142 and / or 144 do not entirely surround the outer circumference of the connector 114 or tube 112 when assembled. Preferably, the slit 230 extends longitudinally completely through the portions 142 and / or 144. The portions 142, 144 may have sufficient flexibility such that the connector 114 or tube 112 can pass through the slit 230 when the portions 142, 144 are bent outward. However, preferably, the flexibility provided by the portions 142, 144 is sufficient to simply facilitate assembly of the portions 142, 144 to the connector 114 or tube 112.

[0043] The swivel elbow 116 of Figure 14 includes a slit 230 that is wider or circumferentially longer than the slit 230 of the swivel elbow 116 of Figure 13. The slit 230 of Figure 14 may extend about ¼ or more of the circumference of the portions 142 and / or 144. Preferably, the slit 230 of the elbow 116 of Figure 14 may allow the tube 112 or connector 114 to pass through the slit 230.

[0044] The swivel elbow 116 of FIG. 15 includes a truncated tube engaging portion 144. That is, the tube engaging portion 144 does not extend the entire circumference of the tube 112 when assembled. Preferably, the tube engaging portion 144 is approximately circumferentially coextensive with the tube guide portion 146. In some cases, this may be about half the circumference of the tube 112. In other cases, this may be between about one-half and three-quarters of the circumference of the tube 112, or between about five-eighths and three-quarters of the circumference of the tube 112.

[0045] Any of the swivel elbows 116 described above may be constructed of a single piece of material or multiple pieces of material (of the same or different materials) connected in any suitable manner. For example, in some cases, the elbow 116 may be constructed by joining two longitudinally separated halves (e.g., a clamshell arrangement). This may allow for easy assembly onto the connector 114 and tube 112 without passing the entire tube 112 through the elbow 116.

[0046] Figures 16-27 show an alternative system 100 including an alternative connection between the breathing tube assembly 110 and the CPAP device 104. As a result, the same reference numbers are used to indicate corresponding or similar components and only the differences between the system 100 of Figures 16-27 and the previous system are described. Features not specifically described may be considered the same or similar to the same or corresponding features of the system of Figures 1-12.

[0047] In the system of Figures 16-27, a fixed elbow connector 114 is provided to couple the tube 112 to the CPAP device 104. That is, in at least some arrangements, the elbow connector 114 cannot rotate relative to the CPAP device 104, but remains connected to the CPAP device 104. Instead, preferably, the elbow connector 114 is connectable to the CPAP device 104 in at least two distinct orientations or positions, and is configured to provide an electrical connection between the breathing tube assembly 110 and / or the patient interface 102 and the CPAP device 104 in each of those distinct positions. In the illustrated arrangement, the CPAP device 104 includes two electrical terminals 132a and 132b, which may be in the form of electrical ports or outlets. The connector 114 includes a single electrical terminal 130, which may be in the form of a plug and may connect to either of the electrical terminals 132a, 132b of the CPAP device 104. In other arrangements, these structures may be reversed, and the port may be on the connector 114 and the plug on the CPAP device 104. The arrangements of Figures 16-27 may advantageously allow the breathing tube assembly 110 to be coupled to the CPAP device 104 in at least two positions that may be selected based on the position of the user or patient relative to the CPAP device 104, while providing electrical connection in either position. In the arrangements shown, the positions are substantially opposite one another (i.e., the tube 112 extends to the left and the tube 112 extends to the right). In other arrangements, the positions may be altered to remain opposite one another (e.g., up and down) or to provide two options that are not opposite one another (e.g., horizontal and vertical). Additionally, more than two options may be provided (e.g., left, right, up and down). In the illustrated arrangement, the connector 114 defines an angle of approximately or substantially 90 degrees between the axis of the breathing tube 112 (e.g., at the end coupled to the connector 114) and the axis of the outlet 106 of the CPAP device 104, resulting in a relatively compact arrangement. However, in other arrangements, this angle may vary.The alternative connectors 114 of Figures 16-27 differ from each other primarily in the manner of interconnection between the CPAP device and the connector 114. Therefore, only the different interconnection structures are described in detail below.

[0048] In the exemplary arrangement of FIGS. 16-18, the connector 114 includes at least one, and preferably a pair of, resilient portions or arms 250 that are movable relative to a body 252 of the connector 114. Each arm 250 includes a fixed end 254 connected to the body 252 and a movable end, which may be a free end 256 that is movable toward and away from the body 252. The arms 250 are disposed on opposite sides of the body 252. In the exemplary arrangement shown, the arms 250 are integrally formed with the body 252; however, in other exemplary arrangements, the arms 250 may be separate and distinct members that are separate from the body 252. Preferably, the arms 250 extend in a direction corresponding to the axis of the outlet 106 from the fixed end 254 to the free end 256 of the arm 250, and have a length that is about half or more of the length of the body 252 of the connector 114.

[0049] The fixed end 254 of each arm 250 is in the form of a pair of spaced apart connecting portions 260 that may provide most or all of the flexibility of the arm 250. The free end 256 of the arm 250 preferably includes a tab 262 configured to selectively engage a corresponding recess or opening 264 in the CPAP device 104 to secure the connector 114 (and breathing tube 112) to the CPAP device 104. The tab 262 and the recess or opening 264 define cooperating interference surfaces that contact each other when the tab 262 is in the recess or opening 264 to inhibit or prevent removal of the connector 114 from the CPAP device 104. In other arrangements, the positions of the tab 262 and the recess or opening 264 may be reversed or other suitable interlocking structures may be provided. Preferably, arms 250 also define tab or finger grip portions 266 that include ridges or other gripping enhancing features that are used to urge arms 250 toward body 252 and toward each other (considered to be a pair of arms 250) to release tabs 262 from recesses or openings 264.

[0050] The connector 114 of FIGS. 19-21 includes a single resilient arm 250 extending along one side of the body 252 of the connector 114. Preferably, the arm 250 extends along the opposite side of the body 252 relative to the tube 112. In the illustrated arrangement, the fixed end 254 of the arm 250 begins at or near the rear end of the body 252 and has a length that is at least about half the length of the body 252. Preferably, the arm 250 is relatively narrow in width except for a tab portion 266, which is wider than the remainder of the arm 250, which may be circular or generally circular in shape and may be located at approximately the midpoint between the fixed end 254 and a tab 262 located at the free end 256.

[0051] The connector 114 of FIGS. 22-24 includes at least one, and preferably a pair of, resilient arms 250 on opposing sides of the body 252. Preferably, the arms 250 are positioned within a concave central portion 270 such that the arms 250 are generally or substantially flat or recessed within the peripheral portion of the body 252. The fixed ends 254 are disposed closer to the open end of the connector 114 than the free ends 256, which are disposed toward the rearward end of the body 252. The tabs 262 of each arm 250 are disposed between the fixed and free ends 254 and 256. Preferably, the tab portion 266 is disposed at or near the free ends 256 of the arms 250. It should be noted that the "free" ends 256 of the arms 250 in this connector 114 are not completely separate from the body 252. Rather, the free ends 256 are connected to the body 252 by a reduced wall thickness portion 272 (FIG. 24), thereby allowing movement of the free ends 256. Also, in the illustrated arrangement, the reduced wall thickness 272 extends along the side of the arm 250. Thus, as used herein, the term "free end" refers to a movable end of a flexible arm that can be completely separated from the surrounding structure, or that can be positioned such that the "free end" can be moved sufficiently relative to the surrounding structure to complete the designated task of the flexible arm (e.g., separation of tab 262 from recess or opening 264). Moreover, the flexible arm is only movable relative to the surrounding structure to complete the designated task.

[0052] The connector 114 of Figs. 25-27 includes a resilient portion 280 that operates similarly to the resilient arm 250 of the connector 114 of Figs. 22-24. In the connector 114 of Figs. 25-27, the resilient portion 280 has a tab 262 and is movable relative to the body 252 of the connector 114. In particular, the resilient portion 280 is partially or completely surrounded by the thin wall portion 272, which limits the movement of the resilient portion 280, which is preferably sufficient to allow separation of the tab 262 from the recess or opening 264. The resilient portion 280 may be centrally located within the body 252 of the connector 114, such that the resilient portion 280 is completely surrounded by the body 252. Preferably, two resilient portions 280 are provided on opposite sides (e.g., top and bottom) of the body 252 of the connector 114.

[0053] 28-30 show another respiratory therapy system 100 including a flow generator 104 (e.g., a CPAP device) and a breathing tube assembly 110. Because the system 100 of FIGS. 28-30 is similar to the system 100 of FIGS. 1-15, the same reference numerals will be used to indicate corresponding or similar components, and only significant differences from the previous system 100 will be described in detail. Any components, assemblies, or features not described in detail may be considered the same or similar to corresponding components, assemblies, or features of any of the previous systems 100, or may be in any other suitable arrangement. Additionally, the system 100 may include any of the optional features of the system 100 of FIGS. 1-15 (e.g., tab 200) that are not shown or described in the embodiment shown in FIGS. 28-30.

[0054] 1-15, the illustrated swivel elbow 116 urges, guides, restrains, or otherwise directs a portion of the tube 112 into a curved shape to provide anti-collapse functionality and to allow repositioning of the tube 112 relative to the CPAP device 104. Preferably, the curved portion of the tube 112 is near or adjacent to the connector 114. A connector-engaging portion 142 of the illustrated swivel elbow 116 engages the connector 114, and a tube-engaging portion 144 of the swivel elbow 116 engages the tube 112. In the illustrated example arrangement, the connector-engaging portion 142 and the tube-engaging portion 144 are in the form of a band that substantially or entirely surrounds the circumference of the connector 114 and / or the tube 112.

[0055] Tube guide portion 146 extends between connector engaging portion 142 and tube engaging portion 144. Preferably, tube guide portion 146 defines a curved surface 150 that guides tube 112 in a curved orientation. As previously mentioned, the angular offset between the axis of connector engaging portion 142 and the axis of tube engaging portion 144 may be approximately 90 degrees or any of the angles previously described relative to elbow 116 of FIGS. 1-15.

[0056] In the illustrated example arrangement, similar to the elbow 116 shown in Figures 1-15, the tube guide portion 146 only partially surrounds the tube 112. In particular, the illustrated tube guide portion 146 surrounds approximately half or exactly half of the circumference of the tube 112. Preferably, unlike the elbow 116 of Figures 1-15, the tube guide portion 146 of Figures 28-30 is positioned at least partially inside the tube 112 relative to the bend (e.g., the center point of the bend radius) such that the tube guide portion 146 is positioned to support at least a portion of the inner bend surface of the tube 112. Such an arrangement provides convenient support and anti-collapse function for the tube 112 and allows for rotational adjustment of the tube 112 relative to the CPAP device 104, while allowing the elbow 116 to be easily manufactured. Preferably, the tube guide portion 146 extends circumferentially (relative to the tube 112) around the entire inner half of the tube 112. The illustrated tube guide portion 146 has a solid wall between its opposing (upper and lower) edges; however, the guide portion 146 may include one or more openings or windows (or may be comprised of one or more axial portions) to reduce material or to adjust tube flexibility. As noted above, while the tube guide portion 146 is shown as being external to the tube 112, in other arrangements it may be internal.

[0057] As discussed above, preferably, the swivel elbow 116 is rotatable about at least the longitudinal axis of the outlet 106 of the CPAP device 104 to allow the position of the tube 112 to be altered relative to the CPAP device 104. In the illustrated arrangement, the swivel elbow 116 can rotate 360 ​​degrees or more about the axis of the outlet 106. That is, the swivel elbow 116 can rotate in one direction for multiple rotations. However, in other arrangements, the rotation of the swivel elbow 116 is limited, as discussed above.

[0058] The swivel elbow 116 of Figures 28-30 also preferably includes one or more features that facilitate assembly and / or disassembly of the breathing tube assembly 110 to and / or from the CPAP device 104. For example, the illustrated swivel elbow 116 includes a tab 290 of a suitable size and shape that allows a user to grasp the tab 290 to facilitate assembly of the breathing tube assembly 110 to the CPAP device 104 or removal of the breathing tube assembly 110 from the CPAP device 104. Preferably, the tab 290 is located at or near the connector engaging portion 142 of the swivel elbow 116 or is otherwise oriented substantially perpendicular to the longitudinal axis of the connecting portion of the breathing tube assembly 110 adjacent the outlet 106 of the CPAP device 104. Preferably, the tab 290 is oriented substantially perpendicular to the axis of the outlet 106 and / or to an exterior surface of the CPAP device 104 surrounding or adjacent the outlet 106.

[0059] In the illustrated example arrangement, the tab 290 is positioned on the outside of the swivel elbow 116 (outside of the bend) and / or on the side of the elbow 116 opposite the tube engaging portion 144. Advantageously, with such an arrangement, a user can grasp both the tab 290 and the tube engaging portion 144 of the swivel elbow 116 and apply a uniform or balanced force to the tube assembly 110 that is substantially aligned with the axis of the connector 114 and / or the outlet 106, facilitating assembly or disassembly of the breathing tube assembly 110 to or from the CPAP device 104. The manufacture and assembly of the breathing tube 110, the assembly of the tube 110 to the CPAP (or other) device 104, and the operation of the system 100 are preferably substantially similar or identical to those described above with reference to Figures 1-15.

[0060] Unless the context clearly dictates otherwise, throughout the description and claims, the words "comprise," "comprising," and the like, are to be construed as inclusive, i.e., "including but not limited to," as opposed to exclusive or exhaustive.

[0061] The reference to any prior art in this specification is not, and should not be taken as, an acknowledgment, or any form of suggestion that the prior art forms part of the common general knowledge in the field of endeavor of any country throughout the world.

[0062] The invention may also be generally referred to in any or all combinations of two or more of the parts, elements and features described or illustrated in the specification of this application, either individually or collectively, said parts, elements or features.

[0063] Where in the above description integers or components having known equivalents thereto are mentioned, those integers are incorporated herein as if individually set forth.

[0064] It should be noted that various changes and modifications to the presently preferred embodiments described herein will be apparent to those skilled in the art. Such changes and modifications can be made without departing from the spirit and scope of the present invention and without diminishing its attendant advantages. Therefore, such changes and modifications are intended to be included within the scope of the present invention.

Claims

1. a flow generator for generating a flow of breathing gas, the flow generator including an outlet for the flow of breathing gas; a flexible breathing tube assembly including a connector and a tube, the tube having a first end and a second end, the first end substantially non-rotatably coupled to the connector, and the connector coupling the breathing tube to the outlet of the flow generator; a patient interface coupled to the second end of the breathing tube, the patient interface enabling the breathing tube to deliver the flow of the breathing gas from the flow generator to the patient interface; a swivel elbow rotatably coupled to the connector of the breathing tube, the swivel elbow including an engagement portion that at least partially surrounds the breathing tube to couple the swivel elbow to the breathing tube, and further including a curved portion that directs a first portion of the breathing tube into a curved shape; 1. A respiratory therapy system comprising: A respiratory therapy system, wherein the breathing tube is rotatable relative to the engagement portion of the swivel elbow, and the swivel elbow is rotatable relative to the connector to change the direction in which the breathing tube extends relative to the flow generator.

2. 2. The respiratory therapy system of claim 1, wherein the swivel elbow is more resistant to deformation than the breathing tube so as to prevent occlusion of the breathing tube, in use, as a result of the swivel elbow collapsing due to an external force.

3. The respiratory therapy system of claim 1 or 2, wherein the engagement portion completely surrounds the respiratory tube.

4. 3. The respiratory therapy system of claim 1 or 2, wherein the engagement portion only partially surrounds the respiratory tube, thereby defining a slit in the engagement portion.

5. The respiratory therapy system of any one of claims 1 to 4, wherein the curved portion extends between a portion of the swivel elbow that is coupled to the connector and the engagement portion.

6. The respiratory therapy system of any one of claims 1 to 5, wherein the curved portion subtends an angle of approximately 90 degrees along the length of the breathing tube.

7. The respiratory therapy system of any one of claims 1 to 6, wherein the curved portion circumferentially surrounds approximately half of the respiratory tube.

8. The respiratory therapy system of any one of claims 1 to 7, wherein the curved portion is located on an inner portion of the curved shape.

9. The respiratory therapy system of any one of claims 1 to 7, wherein the curved portion is located on an outer portion of the curved shape.

10. 10. The respiratory therapy system of claim 1, wherein the swivel elbow further includes a tab sized and shaped to facilitate gripping by a user, the tab positioned generally opposite the curved portion or engagement portion.

11. The respiratory therapy system of any one of claims 1 to 10, wherein the swivel elbow is comprised of a pair of interlocking halves.

12. 12. The respiratory therapy system of claim 1, wherein the connector includes a first interface surface portion and the flow generator includes a second interface surface portion that engages the first interface surface portion to secure the respiratory tube to the flow generator when the respiratory tube is coupled to the flow generator.

13. 13. The respiratory therapy system of claim 12, wherein the second interface surface portion is defined by the outlet of the flow generator and the first interface surface portion is defined by a portion of the connector received within the outlet.

14. 13. The respiratory therapy system of claim 12, wherein the second interface surface portion is adjacent the outlet of the flow generator and the first interface surface portion is defined by a portion of the connector adjacent the outlet.

15. 15. The respiratory therapy system of claim 14, wherein the first interface surface portion is defined by a tab on the connector, the tab engaging a corresponding recess on the flow generator.

16. 12. The respiratory therapy system of claim 1, wherein the swivel elbow includes a shoulder defining a first interface surface portion and the flow generator includes at least one tab defining a second interface surface portion that engages the first interface surface portion to secure the breathing tube to the flow generator when the breathing tube is coupled to the flow generator.

17. 17. The respiratory therapy system of any one of claims 1 to 16, wherein the connector includes a first electrical terminal configured to connect to a second electrical terminal on the flow generator.

18. 20. The respiratory therapy system of claim 17, wherein the first and second electrical terminals connect a heat source of the flow generator to a heating coil of the breathing tube.

19. 19. The respiratory therapy system of claim 17 or 18, wherein the first and second electrical terminals provide data communication between the breathing tube and the flow generator.

20. a flexible breathing tube coupled to a flow generator to receive a flow of breathing gas from the flow generator and coupled to a patient interface to deliver the flow of breathing gas to the patient interface; a swivel elbow that engages a portion of the breathing tube, the swivel elbow including a curved portion that directs the portion of the breathing tube into a curved shape, the swivel elbow being rotatable relative to the flow generator and also rotatable relative to the portion of the breathing tube, allowing the swivel elbow to rotate relative to the flow generator to change the direction in which the breathing tube extends relative to the flow generator; 1. A breathing tube assembly comprising:

21. 21. The breathing tube assembly of claim 20, wherein the curved portion of the swivel elbow contacts an exterior surface of the breathing tube.

22. 22. A breathing tube assembly as claimed in claim 20 or 21, wherein the curved portion subtends an angle of about 90 degrees along the length of the breathing tube.

23. A breathing tube assembly according to any one of claims 20 to 22, wherein the curved portion circumferentially surrounds approximately half of the breathing tube.

24. A breathing tube assembly according to any one of claims 20 to 23, wherein the curved portion is located on an inner portion of the curved shape.

25. A breathing tube assembly according to any one of claims 20 to 23, wherein the curved portion is located on an outer portion of the curved shape.

26. 26. A breathing tube assembly according to any one of claims 20 to 25, wherein the swivel elbow further comprises a tab sized and shaped to facilitate gripping by a user, the tab being located generally opposite the curved portion or portion of the swivel elbow that at least partially surrounds the breathing tube.

27. A breathing tube assembly according to any one of claims 20 to 26, wherein the swivel elbow is comprised of a pair of interlocking halves.

28. 28. A breathing tube assembly according to any one of claims 20 to 27, wherein the connector includes a first interface surface portion and the flow generator includes a second interface surface portion that engages with the first interface surface portion to secure the breathing tube to the flow generator when the breathing tube is coupled to the flow generator.

29. 30. A breathing tube assembly as claimed in claim 28, wherein the second interface surface portion is defined by the outlet of the flow generator and the first interface surface portion is defined by a portion of the connector received within the outlet.

30. 30. A breathing tube assembly as claimed in claim 28, wherein the second interface surface portion is adjacent the outlet of the flow generator and the first interface surface portion is defined by a portion of the connector adjacent the outlet.

31. 31. A breathing tube assembly as claimed in claim 30, wherein the first interface surface portion is defined by a tab on the connector, the tab engaging a corresponding recess in the flow generator.

32. 28. A breathing tube assembly according to any one of claims 20 to 27, wherein the swivel elbow includes a first interference surface portion and at least one tab of the flow generator includes a second interference surface portion, the second interference surface portion engaging the first interference surface portion to secure the breathing tube to the flow generator when the breathing tube is coupled to the flow generator.

33. 33. A breathing tube assembly according to any one of claims 20 to 32, wherein the connector includes a first electrical terminal, the first electrical terminal configured to connect to a second electrical terminal on the flow generator.

34. 34. The breathing tube assembly of claim 33, wherein the first and second electrical terminals connect a heat source of the flow generator to a heating coil of the breathing tube.

35. 35. A breathing tube assembly according to claim 33 or 34, wherein the first and second electrical terminals provide data communication between the breathing tube and the flow generator.

36. a flow generator for generating a flow of breathing gas, the flow generator including an outlet for the flow of breathing gas, a first electrical terminal, and a second electrical terminal; a flexible breathing tube assembly including a tube and a connector, the tube having a first end and a second end, the first end of the tube coupled to the connector, the connector coupling the breathing tube assembly to the outlet of the flow generator, the connector having a tube electrical terminal connectable to either the first electrical terminal or the second electrical terminal of the flow generator; a patient interface coupled to the second end of the tube, the patient interface enabling the breathing tube assembly to deliver the flow of the breathing gas from the flow generator to the patient interface; 1. A respiratory therapy system comprising: a respiratory therapy system, the respiratory tube assembly being connectable to the flow generator at a first location where an electrical terminal of the tube is coupled to the first electrical terminal of the flow generator, and the respiratory tube assembly being connectable to the flow generator at a second location where an electrical terminal of the tube is coupled to the second electrical terminal of the flow generator.

37. 37. The respiratory therapy system of claim 36, wherein the outlet of the flow generator defines an outlet axis and the first end of the tube defines a tube axis, and the connector orients the tube axis at an angle relative to the outlet axis in each of the first and second positions.

38. 38. The respiratory therapy system of claim 37, wherein the angle is approximately 90 degrees.

39. 39. The respiratory therapy system of any one of claims 36-38, wherein the tube extends in a first direction when the breathing tube assembly is in the first position and extends in a second direction when the breathing tube assembly is in the second position, the second direction being opposite to the first direction.

40. 40. The respiratory therapy system of any one of claims 36-39, wherein the connector includes a first interface surface portion and the flow generator includes a second interface surface portion that engages the first interface surface portion to secure the respiratory tube to the flow generator when the respiratory tube is coupled to the flow generator.

41. 41. The respiratory therapy system of claim 40, wherein the second interface surface portion is defined by the outlet of the flow generator and the first interface surface portion is defined by a portion of the connector received within the outlet.

42. 42. The respiratory therapy system of claim 40 or 41, wherein the first interface surface portion is defined by a tab on the connector, the tab engaging a corresponding recess on the flow generator.

43. 43. The respiratory therapy system of any one of claims 36 to 42, wherein the first and second electrical terminals and the electrical terminal of the tube connect a heat source of the flow generator to a heating coil of the respiratory tube.

44. 44. The respiratory therapy system of any one of claims 36 to 43, wherein the first and second electrical terminals and the tube electrical terminal provide data communication between the breathing tube and the flow generator.

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