Breathing 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 respiratory therapy systems and breathing tube assemblies for use with respiratory therapy systems. More particularly, the present invention relates to elbows for breathing tube assemblies that allow 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 the breathing tube relative to the respiratory therapy device to be adjustable are known in the art. However, existing adjustable breathing tube assemblies are often complex to manufacture, resulting in higher costs and often having a shorter service life than non-adjustable assemblies. Summary of the Invention [Problem to be solved by the invention]

[0003] As a result, there is a need 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 for 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] In a preferred embodiment, a respiratory therapy system and breathing tube assembly for use with a respiratory therapy system, such as a CPAP system, 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 rotatably 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 respiratory gas and includes an outlet for the flow of respiratory 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 so that the breathing tube can deliver the flow of respiratory 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 configurations, 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 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 engagement portion. The swivel elbow may be comprised of a pair of interlocking halves.

[0008] In some 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 with the first interface surface portion to secure the breathing tube to the flow generator. 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 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 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] Embodiments relate to a breathing tube assembly including a flexible breathing tube that can 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 can 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 configurations, the curved portion of the swivel elbow contacts the outer surface of the breathing tube. 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 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 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 with 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 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 can provide data communication between the breathing tube and the flow generator.

[0014] The embodiments relate 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 respiratory gas and includes an outlet for the flow of respiratory 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 on the tube that can be connected to either the first or second electrical terminal on the flow generator. The patient interface is coupled to the second end of the tube so that the breathing tube assembly can deliver the flow of respiratory 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 on the tube is coupled to the first electrical terminal on the flow generator and in a second position where the electrical terminal on the tube is coupled to the second electrical terminal on the flow generator.

[0015] In some arrangements, the outlet of the flow generator defines an outlet axis, 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 can 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 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 with 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 received within the outlet. The first interface surface portion may be defined by a tab on the connector, which may engage a corresponding recess in the flow generator.

[0017] In some 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. The drawings include 30 views. [Brief explanation 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. [Figure 2] FIG. 2 is a perspective view of the breathing tube assembly of FIG. 1 separated from the flow generator. [Figure 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. [Figure 5] FIG. 10 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. 10 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. 10 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. 13. [Figure 15] FIG. 10 is a perspective view of another alternative swivel elbow omitting one of the loop end portions of the previous swivel elbow. [Figure 16]

[0013] Figure 1 is a perspective view of a flow generator and an alternative breathing tube assembly including a tubing and an elbow connector. The flow generator includes a first electrical terminal and a second electrical terminal. The breathing tube assembly includes an electrical terminal on the tubing that connects to the first electrical terminal at a first position on the breathing tube assembly and to the second electrical terminal at a second position on the breathing tube assembly. The elbow connector includes an interlocking formation 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 assembly of FIGS. 16-21. [Figure 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. [Figure 25] FIG. 25 is a perspective view of a flow generator and yet another alternative breathing tube assembly for the assembly 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] 28 is a perspective view of a flow generator and an alternative breathing tube assembly similar to the breathing tube assemblies of Figures 1 to 15. The breathing tube assembly of Figure 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. [Figure 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 INVENTION

[0020] The respiratory therapy system, breathing tube assembly, and related components are described herein in the context of a healthcare respiratory device that provides breathing gas at or above a minimum pressure or flow, preferably at an elevated pressure relative 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 can also be used in other contexts or applications. For example, the system, breathing tube assembly, and related components can be used in adult, pediatric, or infant respiratory systems, and in surgical humidification systems, among others. Therefore, 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, which 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 uses. System 100 includes a flow generator 104, preferably a CPAP device, which generates a flow of humidified breathing gas, e.g., air, as described above. CPAP device 104 preferably includes an internal water reservoir (not shown), a heating device for heating water in the reservoir, and a blower or pump (not shown) for generating 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, flow generator 104 can provide a flow of unhumidified breathing gas, which can be air or another 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 flow of humidified air from the outlet 106 to the patient interface 102. The patient interface 102 may be any suitable type of interface capable of delivering a flow of air 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, and endotracheal or tracheostomy interfaces.

[0023] The breathing tube assembly 110 preferably includes a tubing 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, accommodating the movements of a 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-wound heating coil confined within the wall 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 can 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 can 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 away from the tube 112. The shaft 124 is hollow and defines an interior passageway 126 that communicates 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 the female portion of the connection and the outlet 106 may define the male portion.

[0025] Preferably, when the breathing tube assembly 110 is assembled to the CPAP device 104, the flange 122 abuts the exterior surface of the CPAP device 104. The flange 122 also has electrical terminals that engage complementary electrical terminals on the CPAP device 104, allowing 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 on the connector 114 is a plug 130, and the electrical terminal on 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 circuits 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 humidified air flow 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 CPAP machine's control system. Any other desired electrical signals can also be transmitted.

[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 engages a complementary groove (not shown) in the outlet 106 to properly align the plug 130 with the port 132, thereby assisting insertion of the connector 114 into the outlet 106. Additionally or alternatively, the length of the guide rib 134 and the plug 130 may be increased compared to the exemplary arrangement shown in FIGS. 1-4 . For example, the length of the plug 130 may be between approximately three-quarters the length of the shaft 124 and approximately 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 assists in proper alignment and insertion of the connector 114 into the outlet 106. In the illustrated arrangement, the guide rib 134 is positioned opposite the plug 130 .

[0027] The connector 114 also preferably includes features that facilitate retention of the connector 114 to the CPAP device 104. Some arrangements feature an interlocking configuration between the connector 114 and the CPAP device 104. 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 recess 140 may be reversed. The illustrated protrusion 136 and recess 138 are elongated and extend circumferentially around the shaft 124 and outlet 106, respectively. Furthermore, preferably, two or more protrusion / recess pairs 136 / 140 are provided. In the illustrated arrangement, two pairs of corresponding projections 136 and recesses 140 are provided and are equally spaced around 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 also be used.

[0028] Preferably, the breathing tube assembly 110 includes one or more features, such as urging a portion of the breathing tube 112 into a curved shape and / or providing a collapse-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 configurations, the portion of the breathing tube 112 that is urged into a curved shape and / or provided with a collapse-resistant feature is a portion of the tube 112 adjacent the connector 114. In some cases, the outlet 106 is positioned on the posterior face of the CPAP device 104 (e.g., relative to a user interface or otherwise defined front face). 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., the posterior face) of the CPAP device 104. Furthermore, positioning the outlet 106 backward (or otherwise) creates the risk of the CPAP device 104 being pushed toward a wall or other object until the breathing conduit 112 is crushed against the wall or other object, which may cause partial or complete obstruction and / or damage to the breathing conduit 112. Therefore, it is often desirable to provide some degree of protection for the breathing conduit 112, particularly the portion of the breathing conduit 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 conduit 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 conduit 112 into a curved shape, provides anti-collapse functionality, and allows the position of the conduit 112 relative to the CPAP device 104 to be changed. However, in other 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 tubing 112 into a curved shape or orientation. Preferably, the curved portion of the tubing 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 tubing 112. In the illustrated arrangement, the connector-engaging portion 142 and the tube-engaging portion 144 are in the form of bands and substantially or entirely surround the circumference of the connector 114 and / or the tubing 112. In an alternative arrangement, the swivel elbow 116 can instead be coupled to the CPAP device 104 while retaining 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 curve. 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 a 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. Furthermore, 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] Preferably, the swivel elbow 116 also provides at least some crush protection to 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 more resistant to bending compared to the tube 112. While relatively rigid plastic, metal, or other materials may be used, one 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 of partially or completely occluding tube 112. As noted 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 relative to the CPAP device 104 to be changed. In the illustrated arrangement, the swivel elbow 116 can be rotated 360 degrees or more about the axis of the outlet 106. That is, the swivel elbow 116 can be rotated in one direction for multiple rotations. However, in other arrangements, the rotation of the swivel elbow 116 can 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 can be less than 45 degrees, more than 45 degrees, more than 180 degrees, or more than 270 degrees, among other possibilities.

[0033] As described above, the swivel elbow 116 may be coupled to the connector 114. In the illustrated example arrangement, the connector engaging portion 142 receives a boss 152 of the connector 114 that extends from the flange 122 in a direction opposite to 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 while allowing rotation therebetween. The illustrated interlocking arrangement includes a circumferential protrusion 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 illustrated example arrangement, the protrusion 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 one pair, and preferably exactly one pair, of projection portions 154 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 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 housed within the swivel elbow 116, such that a gap exists or can 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 relies on the flexibility of the tube 112 to change position. In some example configurations, the gap between the tube 112 and the inner surface of the swivel elbow 116 may be in the range of approximately 0.05 to 0.1 millimeters. However, the gap may also be less than or greater than 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, adjusting the position of the tube 112 relative to the CPAP device 104 is possible, with the swivel elbow 116 being able to orient the tube 112 in a desired direction. Advantageously, such an arrangement provides for adjusting the position of the tube 112 relative to the CPAP device 104 while maintaining electrical connection between the electrical terminals 130 and 132 and extending service life using a relatively simple structure that is cost-effective to manufacture. In an alternative arrangement, the swivel elbow 116 provides additional degrees of freedom of movement. For example, the swivel elbow 116 can be rotated (e.g., via a ball-and-socket joint) about one or more axes that are 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 set appropriately. If necessary, the swivel elbow 116 may be assembled to the tubing 112 and connector 114. For example, the swivel elbow 116 may be slid from the patient-interface end of the tubing 112 to the connector end of the tubing 112 and coupled to the connector 114 via an interlocking arrangement. The patient interface 102 may be coupled to the tubing 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 tubing 112) to orient the tubing 112 and patient interface 102 in a desired position (e.g., right, left, up, or down) relative to the CPAP device 104 while maintaining a connection between the electrical terminals 130 and 132. The CPAP device 104 may then be used according to the desired protocol.

[0036] 5-8 illustrate another respiratory therapy system 100 that includes a breathing tube assembly 110 similar to system 100 of FIGS. 1-4. Consequently, the same reference numerals are used to indicate corresponding or similar components, and only differences from system 100 are described. Components, assemblies, or features not specifically described may be considered the same or similar to the same components, assemblies, or features of system 100 of FIGS. 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 interlocking configuration shown, 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 positioned opposite the electrical plug 130; however, other positions are possible. The length of the tab 200 is approximately the same as or slightly longer than the length of the plug 130. Preferably, the tab 200 is shorter than the guide rib 134 (if present), which is preferably positioned midway between the tab 200 and the plug 130.

[0038] Tab 200 is preferably generally U-shaped and has a free end 204 and a fixed end 206 that couple to flange 122 or another portion of connector 114. Preferably, tab 200 is integral with connector 114 and / or flange 122. The closed end of U-shaped tab 200 preferably extends away from flange 122 in the same direction as shaft 124. An interference surface is defined by a protrusion 136 located on a leg of U-shaped tab 200, which leg defines free end 204 in the illustrated arrangement. However, in some arrangements, protrusion 136 can be positioned on the other leg or both legs. Free end 204 is movable such that protrusion 136 can enter recess 202 and then engage a corresponding interference surface defined by a space, opening, or recess 140 extending from recess 202. In the illustrated arrangement, the interference surface is defined by the outer housing of the CPAP device 104, and the protrusion is 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. Consequently, the same reference numerals will be used to indicate corresponding or similar components, and only differences from system 100 will be described. Components, assemblies, or features 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] 9-12, an alternative interlocking configuration is provided for securing the connector 114 to the CPAP device 104. In particular, in the illustrated interlocking configuration, the swivel elbow 116 includes an annular portion 220 that surrounds all or a portion of the flange 122 of the connector 114. The 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, axially securing the connector 114 and swivel elbow 116 to the CPAP device 104 while allowing 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 a plug 130 and / or other structure (e.g., guide ribs 134). Tab 224 includes a hook portion 226 that defines an interference surface that contacts one or more interference surfaces of swivel elbow 116. In other respects, system 100 and breathing tube assembly 110 of Figures 9-12 are similar in structure and operation to system 100 and tube assembly 110 of Figures 1-4 or 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. Consequently, the same reference numerals are used to indicate corresponding or similar components, and only differences from the 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, preferably each. As a result, 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 portions 142 and / or 144. When portions 142, 144 are bent outward, portions 142, 144 may have sufficient flexibility to allow the connector 114 or tube 112 to pass through the slit 230. Preferably, however, the flexibility provided by portions 142, 144 is sufficient to simply and easily assemble 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 one-quarter 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 approximately one-half of the circumference of the tube 112. In other cases, this may be between approximately one-half and three-quarters of the circumference of the tube 112, or between approximately 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 configuration). 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. Consequently, the same reference numerals will be used to indicate corresponding or similar components, and only differences between the system 100 of Figures 16-27 and the previous system will be 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] 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, the elbow connector 114 is preferably connectable to the CPAP device 104 in at least two distinct orientations or positions and 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 located 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 user's or patient's position relative to the CPAP device 104, while providing an electrical connection in either position. In the arrangement shown, these positions are substantially opposite each other (i.e., tube 112 extends to the left and tube 112 extends to the right). In other arrangements, these positions may be varied to remain opposite each other (e.g., top and bottom) or to provide two options that are not opposite each other (e.g., horizontal and vertical). Additionally, three or more options may be provided (e.g., left, right, top and bottom). 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 one another 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] 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 illustrated arrangement, the arms 250 are integrally formed with the body 252; however, in other arrangements, the arms 250 may be separate, distinct members 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 greater than or equal to about half 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 contact and define cooperating interference surfaces 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 grip-enhancing features that are used to push 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] 19-21 includes a single resilient arm 250 extending along one side of a 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 approximately half the length of the body 252. Preferably, the arm 250 is relatively narrow except for a tab portion 266, which is wider than the remainder of the arm 250, and which may be circular or generally circular in shape and located approximately midway 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 opposite sides of a body 252. Preferably, the arms 250 are positioned within a recessed central portion 270, causing the arms 250 to be generally or substantially flat or recessed within the peripheral portion of the body 252. The fixed ends 254 are located closer to the open end of the connector 114 than the free ends 256, which are located toward the rearward end of the body 252. A tab 262 of each arm 250 is located between the fixed and free ends 254 and 256. Preferably, a tab portion 266 is located at or near the free ends 256 of the arms 250. Note that the "free" ends 256 of the arms 250 in this connector 114 are not completely separated from the body 252. Rather, the free ends 256 are connected to the body 252 by a thinner-walled portion 272 ( FIG. 24 ), thereby allowing movement of the free ends 256. Also, in the illustrated arrangement, the reduced wall thickness portion 272 extends along the side of the arm 250. Therefore, as used herein, the term "free end" refers to the movable end of the flexible arm, which may be completely separated from the surrounding structure, or may be positioned to allow sufficient movement of the "free end" relative to the surrounding structure to complete the flexible arm's designated task (e.g., separation of the tab 262 from the recess or opening 264). Furthermore, the flexible arm may only be movable relative to the surrounding structure to complete its 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 a thin-walled portion 272, which limits the movement of the resilient portion 280, preferably sufficient to allow separation of the tab 262 from the recess or opening 264. The resilient portion 280 can be centered 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., the top and bottom) of the body 252 of the connector 114.

[0053] 28-30 illustrate 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 are used to indicate corresponding or similar components, and only significant differences from the foregoing system 100 are described in detail. Any component, assembly, or feature not described in detail may be considered identical to or similar to a corresponding component, assembly, or feature of any of the preceding 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 illustrated in FIGS. 28-30.

[0054] 1-15 , the illustrated swivel elbow 116 urges, guides, restrains, or otherwise directs a portion of the tubing 112 into a curved shape to provide anti-collapse functionality and allow for repositioning of the tubing 112 relative to the CPAP device 104. Preferably, the curved portion of the tubing 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 tubing 112. In the illustrated 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 tubing 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 can be approximately 90 degrees or any of the angles previously described for elbow 116 in FIGS. 1-15.

[0056] In the illustrated arrangement, similar to the elbow 116 shown in FIGS. 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 FIGS. 1-15, the tube guide portion 146 of FIGS. 28-30 is positioned at least partially inside the tube 112 relative to the bend (e.g., the center point of the bend radius) so 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 advantageous support and anti-collapse functionality for the tube 112 and allows for rotational adjustment of the tube 112 relative to the CPAP device 104, while simplifying the manufacture of the elbow 116. 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 adjust tube flexibility. As noted above, while the tube guide portion 146 is shown as being external to the tube 112, it may be internal in other arrangements.

[0057] As mentioned above, the swivel elbow 116 is preferably rotatable about at least the longitudinal axis of the outlet 106 of the CPAP device 104, allowing the position of the tube 112 relative to the CPAP device 104 to be changed. 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 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 outer surface of the CPAP device 104 surrounding or adjacent the outlet 106.

[0059] In the illustrated 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 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 FIGS. 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 herein to any prior art 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 said to consist in any or all combinations of two or more of the parts, elements and features described or shown in the specification of this application, individually or collectively, said parts, elements or features.

[0063] Where the above description refers to integers or components that have known equivalents, 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 breathing tube assembly including a breathing tube, a connector, and an elbow, The breathing tube comprises: a first end; a second end; and Internal passages and an electrical element integrated into the breathing tube; The connector is non-rotatably coupled to a first end of the breathing tube, the connector comprising: A flange and a shaft extending from the flange, the shaft defining a connector interior passageway in communication with the interior passageway of the breathing tube; an electrical terminal extending from the flange, the electrical terminal being connected to the electrical element; the connector is configured to be non-rotatably coupled to an outlet of a respiratory therapy device; the elbow is configured to connect to the connector and orient a portion of the breathing tube in a bent shape or curved orientation. Breathing tube assembly.

2. 10. The breathing tube assembly of claim 1, wherein the electrical terminals are configured to engage complementary electrical terminals of the respiratory therapy device to enable electrical signals and / or electrical energy to be transferred between the respiratory device and the breathing tube assembly.

3. 10. The breathing tube assembly of claim 1, wherein the electrical element is a heating circuit or heating coil, a data circuit, or any combination thereof.

4. 10. A breathing tube assembly as claimed in claim 1, wherein the electrical element is a spiral-wound heating coil.

5. 5. The breathing tube assembly of claim 4, wherein the spiral heating coil is confined within the wall of the breathing tube.

6. 10. The breathing tube assembly of claim 1, wherein the electrical terminal extends from the flange in the form of a plug configured to connect with a port of the respiratory therapy device.

7. 7. A breathing tube assembly according to claim 6, wherein the length of the plug is between about three-quarters the length of the shaft and approximately the same length as the shaft, or is longer than the shaft.

8. 8. A breathing tube assembly according to claim 6 or 7, wherein the plug is parallel to and adjacent to the shaft.

9. 10. The breathing tube assembly of claim 1, wherein the breathing tube includes a sensor at the second end for sensing one or more parameters of airflow.

10. 10. The breathing tube assembly of claim 9, wherein the sensor provides an output to the respiratory therapy device regarding one or more parameters of airflow via the electrical element.

11. 10. The breathing tube assembly of claim 1, wherein the shaft includes protrusions that define interference or interlocking surfaces.

12. 12. The breathing tube assembly of claim 11, wherein the protrusion is adapted to cooperate with a recess in the breathing device to couple the breathing tube assembly to the breathing device.

13. 10. The breathing tube assembly of claim 1, wherein the elbow is stiffer than the breathing tube.

14. 2. A breathing tube assembly as claimed in claim 1, wherein the flange includes a boss extending therefrom in a direction opposite to the shaft, the connector-engaging portion of the elbow receiving the boss, thereby joining the elbow and connector.

15. 15. A breathing tube assembly according to claim 14, wherein an interlocking formation axially secures the connector mating portion to the boss but allows rotation therebetween.

16. 16. A breathing tube assembly according to claim 15, wherein the interlocking formation includes a circumferential protrusion defined by one of the connector engaging portion and the boss, and a complementary circumferential groove defined by the other of the connector engaging portion and the boss.

17. 2. The breathing tube assembly of claim 1, wherein the circumferential projection is defined by the boss and the circumferential groove is defined by the connector engaging portion.

18. 10. The breathing tube assembly of claim 1, wherein the elbow is a swivel elbow that can be rotated in one direction for multiple rotations.

19. 10. The breathing tube assembly of claim 1, wherein a gap exists when the breathing tube is centered relative to the elbow to facilitate relative rotation therebetween.

20. 10. The breathing tube assembly of claim 1, wherein the connector is permanently coupled to the breathing tube.

21. 10. The breathing tube assembly of claim 1, wherein the shaft includes guide ribs.

22. 10. The breathing tube assembly of claim 1, wherein the elbow is rotatable about at least a longitudinal axis of the outlet of the respiratory therapy device to allow for repositioning of the tube relative to the respiratory therapy device.

23. 2. The breathing tube assembly of claim 1, wherein the flange has a tube side and a flow generator side, and the electrical terminal extends from the flow generator side parallel to the shaft.

24. 24. A breathing tube assembly as claimed in claim 23, wherein the swivel elbow is adjacent the tube side of the flange.

25. 22. A breathing tube assembly as claimed in claim 21, wherein the guide ribs extend longitudinally of the shaft.

26. 26. A breathing tube assembly according to claim 21 or 25, wherein the guide rib is configured to engage a complementary groove in the outlet.

27. 2. The breathing tube assembly of claim 1, wherein the length of the shaft is greater than the length of the electrical terminal.

28. 10. The breathing tube assembly of claim 1, wherein the electrical terminal is offset from the shaft.

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