# Patent

## Title
Cuff for air delivery conduit

## Abstract

A cuff for an air delivery conduit includes a first end portion provided to a tube and a second end portion adapted to engage a tubular connector. The second end portion includes an entry surface that is curved or chamfered along its length to provide a lead in for inserting the second end portion onto the tubular connector in use. The entry surface provides an internal diameter that is larger than an external diameter of the tubular connector.

## Background
CROSS-REFERENCE TO APPLICATION
This application claims the benefit of U.S. Provisional Patent Application Nos. 61/097,765, filed Sep. 17, 2008, and 61/202,907, filed Apr. 17, 2009, each of which are incorporated herein by reference in its entirety.


FIELD OF THE INVENTION
The present invention relates to cuffs or connectors for air delivery conduits used in breathing apparatus for treatment, e.g., of Sleep Disordered Breathing (SDB) with Continuous Positive Airway Pressure (CPAP) or Non-Invasive Positive Pressure Ventilation (NIPPV).
BACKGROUND OF THE INVENTION
Breathing apparatus to deliver breathable gas to a patient typically includes a positive airway pressure (PAP) device, an optional humidifier, an air or gas delivery conduit, and a patient interface. In use, the air delivery conduit delivers pressurized air or gas from the flow generator and optional humidifier to the patient interface in contact with the patient's face.
Each end of the air delivery conduit includes a cuff or connector for connecting the air delivery conduit to the patient interface and PAP device/humidifier.
The present invention provides improvements to known cuffs to facilitate engagement, seal, and retention.
SUMMARY OF THE INVENTION
One aspect of the invention relates to a cuff for an air delivery conduit including a first end portion provided to a tube and a second end portion adapted to engage a tubular connector. The second end portion includes an entry surface that is curved or chamfered along its length to provide a lead in for inserting the second end portion onto the tubular connector in use. The entry surface provides an internal diameter that is larger than an external diameter of the tubular connector.
Another aspect of the invention relates to a cuff for an air delivery conduit including a first end portion provided to a tube and a second end portion adapted to engage a tubular connector. The second end portion includes an annular bead providing an internal diameter that is smaller than an external diameter of the tubular connector. The annular bead is structured to resiliently deform upon engagement with the tubular connector so as to provide a gas tight seal against the tubular connector and retain the cuff on the tubular connector. The bead has a width that is less than a maximum insertion distance of the cuff.
Another aspect of the invention relates to a cuff for an air delivery conduit including a first end portion provided to a tube and a second end portion adapted to engage a tubular connector. The second end portion includes a radial sealing lip along its opening that provides an internal diameter that is smaller than an external diameter of the tubular connector. The sealing lip is structured to resiliently deform upon engagement with the tubular connector so as to provide a gas tight seal against the tubular connector. The sealing lip provides a flexible protrusion structured to resiliently deflect from a first position and into a second position within a cut-out of the second end portion.
Another aspect of the invention relates to a cuff for an air delivery conduit including a first end portion provided to a tube and a second end portion adapted to engage a tubular connector. The second end portion includes a seal structure to provide a gas tight seal against the tubular connector and a retaining structure substantially independent from the seal structure to retain the cuff on the tubular connector.
Other aspects, features, and advantages of this invention will become apparent from the following detailed description when taken in conjunction with the accompanying drawings, which are a part of this disclosure and which illustrate, by way of example, principles of this invention.



BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings facilitate an understanding of the various embodiments of this invention. In such drawings:
FIG. 1 is a schematic view of an embodiment of a CPAP system;
FIG. 2 is a schematic view of another embodiment of a CPAP system;
FIG. 3 is a schematic view of another embodiment of a CPAP system;
FIG. 4 is a perspective view of an non-heated air delivery conduit including cuffs according to an embodiment of the present invention;
FIGS. 5 to 9 are various views of the cuff of FIG. 4;
FIG. 10 is a cross-sectional view of the cuff of FIG. 4;
FIGS. 11-1 to 11-3 are sequential views showing attachment of the cuff of FIG. 4 to a tubular connector;
FIG. 12 is a cross-sectional view of a cuff according to an alternative embodiment of the present invention;
FIGS. 13 to 18 are various views of a cuff according to an alternative embodiment of the present invention;
FIG. 19 is a perspective view of a heated air delivery conduit including cuffs according to an embodiment of the present invention;
FIGS. 20 and 21 are perspective views of the mask end cuff of FIG. 19;
FIG. 22 is a cross-sectional view of the mask end cuff of FIG. 19;
FIGS. 23 to 26 are various views of the PAP device/humidifier end cuff of FIG. 19;
FIG. 27 is a cross-sectional view of the PAP device/humidifier end cuff of FIG. 19;
FIG. 28 is a cross-sectional view showing engagement of the PAP device/humidifier end cuff of FIG. 19 with a tubular connector;
FIG. 29 is a partial perspective view of a PAP device/humidifier and the tubular connector and electrical connection portion thereof;
FIG. 30 is a front perspective view of an electrical connector according to an embodiment of the present invention;
FIG. 31 is a front perspective view of a connection portion according to an embodiment of the present invention;
FIG. 32 is a perspective view showing the interaction between the electrical connector of FIG. 30 and the connection portion of FIG. 31 according to an embodiment of the present invention;
FIG. 33 is a rear perspective view of the electrical connector of FIG. 30;
FIG. 34 is a rear perspective view of the connection portion of FIG. 31;
FIG. 35 is a perspective view of a cuff according to an alternative embodiment of the present invention;
FIG. 36 is a cross-sectional view of the cuff of FIG. 35;
FIG. 37 is a side view of a heated air delivery conduit including cuffs according to an embodiment of the present invention;
FIG. 38 is a bottom view of the conduit of FIG. 37;
FIG. 39 is an opposite side view of the conduit of FIG. 37;
FIG. 40 is a view from the mask-end cuff of the conduit of FIG. 37;
FIG. 41 is a front view of the PAP device/humidifier end cuff of the conduit of FIG. 37;
FIG. 42 is a cross-sectional view through line 42-42 of FIG. 41;
FIG. 43 is a cross-sectional view through line 43-43 of FIG. 41;
FIG. 44 is a cross-sectional view through line 44-44 of FIG. 42;
FIG. 45 is a perspective view of the cuff of FIG. 41;
FIG. 46 is a cross-sectional view of the mask-end cuff through line 46-46 of FIG. 37;
FIG. 47 is a front view of the mask-end cuff of the conduit of FIG. 37;
FIG. 48 is a cross-sectional view through line 48-48 of FIG. 47; and
FIG. 49 is a cross-sectional view through line 49-49 of FIG. 48.



DETAILED DESCRIPTION OF ILLUSTRATED EMBODIMENTS
The following description is provided in relation to several embodiments which may share common characteristics and features. It is to be understood that one or more features of any one embodiment may be combinable with one or more features of the other embodiments. In addition, any single feature or combination of features in any of the embodiments may constitute additional embodiments.
In this specification, the word “comprising” is to be understood in its “open” sense, that is, in the sense of “including”, and thus not limited to its “closed” sense, that is the sense of “consisting only of”. A corresponding meaning is to be attributed to the corresponding words “comprise”, “comprised” and “comprises” where they appear.
The term “air” will be taken to include breathable gases, for example air with supplemental oxygen. It is also acknowledged that the PAP devices described herein may be designed to pump fluids other than air.
Also, it should be appreciated that reference to a “gas tight” seal may include a seal having an acceptable known leak rate.
1. CPAP System
As schematically shown in FIG. 1, a PAP system (e.g., CPAP system) generally includes a PAP device 10, an air delivery conduit 20 (also referred to as a tube or tubing), and a patient interface 50. In use, the PAP device 10 generates a supply of pressurized air that is delivered to the patient via an air delivery conduit 20 that includes one end coupled to the outlet of the PAP device 10 and an opposite end coupled to the inlet of the patient interface 50. The patient interface comfortably engages the patient's face and provides a seal. The patient interface or mask may have any suitable configuration as is known in the art, e.g., full-face mask, nasal mask, oro-nasal mask, mouth mask, nasal prongs, etc. Also, headgear may be utilized to comfortably support the patient interface in a desired position on the patient's face.
In embodiments, a humidifier may be incorporated or integrated into the PAP device or otherwise provided downstream of the PAP device. In such embodiments, the air delivery conduit 20 may be provided between the patient interface 50 and the outlet of the humidifier 15 as schematically shown in FIG. 2.
It should be appreciated that the air delivery conduit may be provided along the air delivery path in other suitable manners. For example, as schematically shown in FIG. 3, the humidifier 15 may be a separate component from the PAP device 10 so that an air delivery conduit 20(1) is placed between the PAP device 10 and the humidifier 15 and another air delivery conduit 20(2) is placed between the humidifier 15 and the patient interface 50.
Generally, a heated humidifier is used to provide sufficient humidity and temperature to the air so that the patient will be comfortable. In such embodiment, the air delivery conduit may be heated to heat the gas and prevent “rain-out” or condensation forming on the inside of the conduit as the gas is supplied to the patient. In this arrangement, the air delivery conduit may include one or more wires or sensors associated with heating.
As described below, each end of the air delivery conduit includes a cuff structured to attach the tube to the patient interface, PAP device, and/or humidifier. The cuffs differ for non-heated tubes and heated tubes, e.g., cuffs for heated tubes accommodate sensors or electronics/wiring associated with heating.
While the cuff is described as being implemented into a CPAP system of the type described above, it may be implemented into other tubing arrangements for conveying gas or liquid. That is, the CPAP system is merely exemplary, and aspects of the present invention may be incorporated into other suitable arrangements.
2. Cuffs for Non-Heated Tube
FIG. 4 illustrates an embodiment of an air delivery conduit with non-heated tubing. As illustrated, the air delivery conduit 20 includes a tube 25, a first cuff or connector 30(1) provided to one end of the tube 25 and configured and arranged to engage the outlet of the PAP device or humidifier, and a second cuff 30(2) provided to the opposite end of the tube 25 and configured and arranged to engage the inlet of the patient interface.
In the illustrated embodiment, the tube 25 has a relatively smooth interior surface 26 and an exterior surface 27 provided with flexible spiral ribbing 28. However, the interior and exterior surfaces may provide other suitable configurations, e.g., smooth exterior surface, exterior surface with disc-like annular members, etc. In an embodiment, the spiral or helix ribbing 28 has a width of about 2-3 mm, e.g., 2.5 mm, a height of about 1-2 mm, e.g., 1.5 mm, and a pitch of about 4.5 to 5.5 mm, e.g., 5.2 mm, e.g., to optimize flexibility, noise, and occlusion.
In this embodiment, each cuff 30(1), 30(2) is similar to one another. FIGS. 5-9 show various views of the cuff (simply indicated as 30), and FIG. 10 shows an exemplary cross-section through the cuff 30.
As illustrated, the cuff 30 includes a generally cylindrical first end portion 32 and a generally cylindrical second end portion 34. The first end portion 32 is provided (e.g., fixed, co-molded, etc.) to the tube 25 and the second end portion 34 (e.g., with a larger diameter than the first end portion) is removably connectable to a tubular connector 100 (e.g., see FIGS. 11-1 to 11-3) provided to the patient interface, PAP device or humidifier.
In an embodiment, the cuff 30 is molded of a resilient rubber-like material, e.g., TPE. The cuff may be coupled or otherwise communicated with the tube 25 in any suitable manner. For example, the cuff may be formed separately from the tube and attached thereto, e.g., friction fit, mechanical interlock, adhesive, etc. Alternatively, the cuff may be integrally formed in one piece with the tube, e.g., molding, co-molding, etc.
The interior surface of the second end portion 34 provides varying internal diameters to facilitate alignment, engagement, seal, and retention of the cuff with the tubular connector. In this embodiment, the cuffs are designed to allow connection of a 15 mm (internal diameter) tube 25 to a standard 22 mm (external diameter) ISO (International Organization for Standardization)-taper connector (e.g., see outlet connector 100 in FIG. 29) used in medical devices. Such standard or ISO-taper connector is provided to the inlet of the patient interface (e.g., in the form of an elbow end portion, elbow swivel connector, etc.) and the outlet of the PAP device or humidifier.
However, the tube and/or cuffs may have any suitable length or diameter for use in air delivery. For example, the cuffs may be adjusted to suit other connector sizes. That is, the cuffs may be structured for use with other non-“ISO” or non-“standard” connectors. For example, the cuffs may be designed to fit a 15 mm (internal diameter) tube or a 19 mm (external diameter) connector for a patient interface device. In exemplary embodiments, the cuff may be designed to interconnect a 15 mm tube to a 15 mm connector or the cuff may be designed to interconnect a 22 mm tube to a 15 mm connector. Such arrangements may advantageously reduce the weight or bulk of the connections and facilitate increased ease of movement. Also, the cuffs may be used with tubing having alternative internal diameters, e.g., tube may have internal diameter of 15 mm, 19 mm, 22 mm, etc.
2.1 Curved or Chamfered Lead-In
As shown in FIGS. 10 and 11-1 to 11-3, the second end portion 34 provides an entry surface 35 that is curved along its length to provide a curved lead in for inserting the cuff onto the connector 100. That is, the open face or opening of the cuff is flared or tapered outwardly to provide a sufficiently large entry. The curved entry surface 35 provides an internal diameter d1 that is larger than the external diameter of the tubular connector 100. The internal diameter d1 is preferably about 0.1 mm to about 10 mm, 0.5 mm to 10 mm, or more preferably 2 mm to 5 mm, greater than the external diameter of the tubular connector. For example, the internal diameter may be about 23-30 mm (e.g., about 25 mm) for use with a standard 22 mm connector. Such curved lead in and large entry diameter provided by the entry surface 35 facilitates initial alignment and engagement of the cuff 30 with the connector 100. In addition, the curved entry surface 35 leads or guides the connector 100 to the sealing and retention bead 37 of the cuff as described below.
FIG. 12 shows an alternative configuration of the entry surface. In this embodiment, the entry surface 235 includes a chamfered or beveled edge 235(1) which leads to an annular interior surface 235(2). Both the edge 235(1) and interior surface 235(2) provide an entry diameter that is larger than the external diameter of the tubular connector to facilitate alignment and engagement of the cuff with the connector.
2.2 Sealing and Retention Bead
As shown in FIGS. 10, 11-1 to 11-3, and 12, the sealing and retention bead 37 is an annular bead or protrusion provided axially inwardly from the entry surface 35, 235. The bead 37 provides an intermediate internal surface 37(1) that provides an internal diameter d2 that is smaller than the external diameter of the tubular connector 100. The internal diameter d2 is preferably about 0.1 mm to about 5 mm, or more preferably less than 1 mm, less than the external diameter of the tubular connector. For example, the internal diameter may be less than about 22 mm (e.g., about 19-21 mm or less) for use with a standard 22 mm connector. As best shown in FIGS. 11-2 and 11-3, the smaller diameter of the intermediate surface 37(1) is structured to resiliently deform upon engagement with the tubular connector 100 so as to provide a gas tight seal against the exterior surface 102 of the tubular connector 100. In addition, the bead 37 engages the exterior surface 102 with a friction fit so as to retain the cuff 30 on the tubular connector 100.
As illustrated, the width w of the bead 37 is relatively small (e.g., 12 mm or less, e.g., less than about 10 mm, less than about 5 mm, about 2-5 mm or about 3.5 mm) so as to facilitate engagement and disengagement of the bead 37 with the tubular connector 100. Specifically, the bead 37 reduces the surface area in contact with the connector 100 which reduces friction thereby facilitating connection. In known cuffs, the entire length of the interior surface of the cuff is configured to engage the connector so that the force required to engage the cuff progressively increases as the surface area in contact with the connector progressively increases upon insertion. In contrast, only the bead 37 is structured to contact the connector 100 upon insertion, which bead provides a portion of the interior surface length of the cuff, which reduces the engagement/disengagement force. In addition, once the entire width of the bead 37 is engaged with the exterior surface of the connector 100, the engagement force remains fixed and does not progressively increase upon further insertion. Stated differently, the width w of the bead is less than the maximum insertion distance Dmax of the cuff (e.g., see FIG. 10), e.g., the width w of the bead is about 10-90% of Dmax, e.g., less than 50% or about 25-33%.
FIGS. 35 and 36 illustrate a cuff 30 including a sealing and retention bead 37 according to another embodiment of the invention. In this embodiment, the width w of the bead 37 is relatively longer than the bead shown above to enhance interference. For example, in FIG. 36, the width w is about 9-11 mm, e.g., 10 mm, and Dmax is about 18-20 mm, e.g., 19 mm. Also, in FIG. 36, diameter d1 is about 27-30 mm, e.g., 28.6 mm, and diameter d2 is about 20-22 mm, e.g., 21 mm. In an embodiment, the bead 37 may include a slight taper along its length, i.e., slightly larger diameter at the entry end of the bead. In addition, this embodiment provides a chamfered lead-in 235 to the bead, with d4 about 2.5-4.5 mm, e.g., 3.5 mm. The annular interior surface 38 provided between the bead 37 and the stop surface 39 (described in greater detail below) provides an internal diameter d3 that is substantially the same as the external diameter of the tubular connector (e.g., about 22 mm for use with a standard 22 mm connector).
Thus, the bead 37 provides a sealing and retention face to seal the cuff onto the connector and provide a retention force to prevent the cuff and tubing from accidentally being removed from the connector in use. The retention force provided by the cuff may be adjusted (e.g., by adjusting the diameter d2 and/or the width w) to meet any required standards. For example, a required standard may include the retention force being sufficient to allow the PAP device and/or humidifier to be lifted up by the air delivery conduit without the cuff disconnecting from the PAP device and/or humidifier. In an embodiment, the diameter d2 and width w provided by the bead 37 may be determined as a balance between allowing a minimal insertion force to insert the cuff onto the connector and providing sufficient retention force to meet the required standard noted above.
2.3 Stop Surface
A stop surface or flanged faced 39 is provided axially inwardly from the sealing and retention bead 37. As illustrated, the stop surface 39 extends generally transverse to the axis of the cuff so as to provide a stop to prevent the cuff 30 from inserting further onto the connector 100. In addition, the stop surface 39 provides an indication that the cuff 30 and hence the air delivery conduit 20 is fully attached to the connector 100. An external flanged or stepped transition 49 can be seen between the first end portion 32 and the second end portion 34 in FIGS. 10 and 11-1. It can also be seen that the stop surface 39 and the external flanged or stepped transition 49 define concentric circles.
2.4 Wobble Prevention
An annular interior surface 38 (e.g., see FIGS. 10, 11-1 to 11-3, and 12) is provided between the bead 37 and the stop surface 39. Such surface 38 provides an internal diameter that is substantially the same as the external diameter of the tubular connector (e.g., about 22 mm for use with a standard 22 mm connector) or slightly greater by 0.1 mm to 2 mm, between 0 to 5 mm greater, preferably up to 1 mm greater, than the external diameter of the tubular connector (e.g., about 23 mm for use with a standard 22 mm connector). In an embodiment, the internal diameter of the bead 37 when compressed by the connector may be substantially the same as the internal diameter of the interior surface 38. The width of the interior surface 38 may be greater than, less than, or equal to the width of the bead 37. In use, the interior surface 38 is positioned adjacent or near the free end of the connector 100 (e.g., see FIG. 11-3) and prevents or at least reduces any wobbling between the cuff 30 and the connector 100, while introducing little if any force necessary to overcome frictional forces opposing engagement/disengagement of the cuff.
As shown in FIG. 12, one or more grooves 44 may be provided along the interior surface 38 (and/or between the bead 37 and the interior surface 38) to reduce friction in use. That is, each groove 44 provides an internal diameter d4 that is sufficiently larger than an internal diameter d3 of the internal surface 38 so as to avoid any contact between surfaces of the groove 44 and the connector in use.
2.5 Finger Grips
The exterior surface of the cuff includes molded features in the form of grooves or finger grips to facilitate manual attachment and detachment of the cuff to and from the connector.
As shown in FIGS. 5-9, such finger grip may be a generally U-shaped protrusion 40 provided on opposing sides of the cuff and extending across the exterior surface of both the first and second end portions 32, 34 of the cuff. In an alternative embodiment, as shown in FIGS. 13-18, the cuff may be configured to provide a substantially flat surface 42 (e.g., in an ova shape) within each U-shaped protrusion 40, e.g., for raised branding. The raised branding on the surface 42 would assist in providing grip to the cuff.
In addition, the resilient material of the cuff allows the cuff to be deformed (e.g., squeezed) to assist in breaking the seal with the connector and allowing easier release of the cuff from the connector.
2.6 Single-Handed Attachment
The cuff provides an easier, single handed attachment of the air delivery conduit to the connector on the patient interface, PAP device, or humidifier as the entry surface 35 is flared or tapered outwardly to facilitate alignment and engagement and reduce the force required to insert the cuff In an exemplary embodiment, the insertion and removal forces may be in the range of about 30N to about 80N. Such forces may be tunable, e.g., depending on application.
Moreover, the cylindrical configuration of the cuff and internal surfaces (e.g., bead) allows the cuff 30 to be coupled with the tubular connector 100 in any orientation. That is, the cuff 30 does not have to be rotated and/or angled with respect to the tubular connector 100 to provide a sealing engagement.
3. Cuffs for Heated Tube
FIG. 19 illustrates an embodiment of an air delivery conduit with heated tubing. As illustrated, the air delivery conduit 320 includes a tube 325, a first cuff or connector 330(1) provided to one end of the tube 325 and configured and arranged to engage the outlet of the PAP device/humidifier, and a second cuff 330(2) provided to the opposite end of the tube 325 and configured and arranged to engage the inlet of the patient interface.
In this embodiment, the tube 325 is structured to conduct heat along at least a portion of its length. For example, the spiral ribbing 328 of the tube may be structured to support one or more heated wires. In addition, the tube may be structured to support one or more sensing apparatus, e.g., flow sensor, temperature sensor, etc. Further details of such tubing are disclosed in U.S. patent application Ser. No. 11/936,822, filed Nov. 8, 2007, which is incorporated herein by reference in its entirety.
In the illustrated embodiment, the cuffs 330(1), 330(2) are different than one another as described below. However, each cuff provides structure for attaching, sealing, and retaining the cuff to the respective connector, e.g., 22 mm ISO-taper connector.
3.1 Mask End Cuff For Heated Tube
FIGS. 20-22 illustrate the cuff 330(2) structured for attachment to the patient interface or mask. The difference between the cuff 330(2) for the heated tube and the cuff 30 for the non-heated tube described above is that a thermistor 45 is located (e.g., molded into) within the rear portion of the cuff. However, the mechanism for attaching, sealing, and retaining the cuffs to the connector is substantially the same. That is, the cuff 330(2) includes a curved entry surface 35, a sealing and retention bead 37, and a stop surface 39 to aid assembly as shown in FIGS. 11-1 to 11-3 described above.
The thermistor 45 is provided to a fixture 46 within the cuff. In the illustrated embodiment, the fixture 46 is wing-shaped (e.g., see FIG. 21) to optimize convective heat transfer over a range of flow rates, while minimizing noise or pressure drop. However, the fixture 46 may have other suitable shapes and/or textures. The cuff 330(2) may be formed by, for example, overmolding on a pre-block 47, or any method disclosed, for example, in U.S. patent application Ser. No. 11/936,822, which is incorporated herein by reference in its entirety. The thermistor 45 is connected to the wires in the heated tube 325 by lead frames 48. The temperature sensed by the thermistor 45 may be provided as a signal from the thermistor 45 through the lead frames 48 and the wires to a controller located in the humidifier and/or the PAP device.
FIGS. 37-40 and 46-49 illustrate a mask-end cuff 330(2) according to another embodiment of the invention. In this embodiment, the sealing and retention bead 37 is relatively longer and a chamfered lead-in 235 is provided. The dimensions (e.g., w, Dmax, d1, d2, d3, d4) of the retaining and sealing features of the cuff 330(2) are substantially similar to the cuff 30 shown in FIG. 36 and described above. The remaining features of the mask-end cuff 330(2) are substantially similar to the mask-end cuff described above and indicated with similar reference numerals (e.g., fixture 45, thermistor 45).
3.2 PAP Device/Humidifier End Cuff For Heated Tube
FIGS. 23-28 illustrate the cuff 330(1) structured for attachment to the PAP device/humidifier to establish both a pneumatic and electrical connection with the PAP device/humidifier. As illustrated, the cuff 330(1) includes an electrical connector 60 that is configured to provide an electrical connection with the PAP device/humidifier for operating heated wires provided to the tube. The electrical connector 60 includes terminals 62 that are configured to receive contacts provided to the PAP device/humidifier when the cuff 330(1) is connected to the tubular outlet of the PAP device/humidifier. Further details of such a cuff and electrical connection are disclosed in U.S. Provisional Application No. 61/097,765, filed Sep. 17, 2008, which is incorporated herein by reference in its entirety.
In this embodiment, the cuff is configured such that the seal structure for sealing against the connector is substantially independent or separate from the retaining structure for retaining the cuff on the connector.
3.2.1 Sealing
In the illustrated embodiment, the opening of the cuff 330(1) includes a radial lip seal or sealing lip 331 along the interior surface thereof. As shown in FIG. 27, the radial lip seal 331, in its relaxed, undeformed shape, provides an internal diameter d1 that is smaller than the external diameter of the tubular connector 100. The internal diameter d1 is preferably about 0.1 mm to about 10 mm, or more preferably 1 mm to 4 mm, less than the external diameter of the tubular connector. For example, the internal diameter d1 may be less than about 22 mm (e.g., about 19-21 mm or less) for use with a standard 22 mm connector. In use, as best shown in FIG. 28, the sealing lip 331 is structured to resiliently deform upon engagement with the tubular connector 100 so as to provide a gas tight seal against the exterior surface 102 of the tubular connector 100. For example, the sealing lip 331 provides a flexible protrusion structured to resiliently deflect from a first position (FIG. 27) and into a second position (FIG. 28) within a cut-out 335.
As illustrated, the sealing lip 331 tapers outwardly towards the cuff opening to provide a sufficient lead in for aligning and engaging the cuff with the connector.
The interior surface 333 axially inwardly from the sealing lip 331 provides an internal diameter that is substantially the same as the external diameter of the tubular connector, e.g., about 22 mm for use with a standard 22 mm connector. A stop surface or flanged faced 336 within the cuff provides a stop to prevent the cuff from inserting further onto the connector 100.
In an alternative embodiment, as shown in FIGS. 42-45, the interior surface of the cuff may include a series of spaced-apart elongated protrusions or ribs 350 adapted to engage the external diameter of the tubular connector. The number and size (e.g., height, length, and/or width) of the ribs may be selected to adjust the insertion/retention force.
3.2.2 Retention
The electrical connector 60 provides the retention function of the cuff. Specifically, retention is via a rotate-and-lock system to align the terminals or contact surfaces 62 of the electrical connector with electrical pins 11 provided to the PAP device/humidifier (see FIG. 29). As shown in FIG. 29, the electrical pins 11 are supported within a connection portion 12 that extends outwardly from the PAP device/humidifier adjacent the outlet connector 100. The electrical connector 60 provides a heel 64 structured to be rotated into engagement with the connection portion 12 such that the heel 64 locks into a cam or recess 13 provided to the connection portion 12. When engaged, the heel 64 axially locks the cuff into place. To release, the cuff is rotated out of engagement with the connection portion to disengage the heel.
As shown in FIG. 27, a seal 66 extends from the front, back, side, and bottom of the electrical connector 60 and seals against the electrical connection portion 12 of the PAP device/humidifier 10 to prevent water spillage onto the electrical contacts.
The cuff 330(1) provides finger grips 340 along opposing sides thereof and along an edge the electrical connector 60. Also, the cuff 330(1) includes an identifying strip 341 (e.g., orange strip) to identify the tube as a heated tube. In an embodiment, a similar identifying strip may be provided to the user interface of the PAP device/humidifier and configured to illuminate or otherwise signal when the heated tube is operative, e.g., heating up, heated, etc. In addition, indicia and/or images 343 may be provided to the cuff to indicate directions for locking and unlocking the cuff with respect to the PAP device/humidifier 10.
3.2.3 Connection Angles
As noted above, the electrical connector 60 and contact surfaces 62 thereof are structured to be rotated into engagement with the electrical pins 11 supported within the connection portion 12 of the PAP device/humidifier. In order to facilitate engagement of the contact surfaces 62 with the electrical pins 11 and prevent inadvertent damage of the electrical pins 11 upon assembly (e.g., bending of the electrical pins 11), one or more contacting and/or non-contacting faces of the electrical connector 60 and/or connecting portion 12 are suitably positioned, dimensioned, and/or angled.
For example, as described below, the angle of the face may be relatively small or shallow and the length of the face may be relatively long so as to more gradually and smoothly engage the electrical connector and its contact surfaces with the connector portion and its pins. In addition, such arrangement may improve the accuracy of location.
FIGS. 30 and 33 are front and rear perspective views of the electrical connector 60 according to an embodiment of the present invention, FIGS. 31 and 34 are front and rear perspective views of the connection portion 12 according to an embodiment of the present invention, and FIG. 32 is a perspective view showing the interaction between the electrical connector 60 and connection portion 12 according to an embodiment of the present invention.
FIGS. 32-34 best illustrate the interface between the rear or non-pin-contacting side of the connector 60 with the connection portion 12. As illustrated, the electrical connector 60 includes a vertically extending rear contact surface or rear vertical ramp 65(1) which is adapted to engage or otherwise interface with rear contact surface or rear reaction face 14(1) of the connection portion 12. Also, the electrical connector 60 includes rear contact surface or ramp 65(2) which is adapted to engage or otherwise interface with contact surface or reaction face 14(2) of the connection portion 12.
The ramp 65(1) brings the connector from about 2 mm to 0.2 mm of clearance with the connection portion 12. The ramp 65(2) brings the connector fully forward (e.g., the last 0.2 mm) into engagement with the reaction face 14(2). The ramp 65(2) is relatively short, so that the parallel front and rear faces 67(1), 67(2) are interacting or engaging before pin contact.
FIGS. 30-32 best illustrate the interface between the front or pin-contacting side of the connector 60 with the connection portion 12. As illustrated, the electrical connector 60 includes a vertically extending front contact surface or vertical lead-in 65(3) which is adapted to engage or otherwise interface with contact surface 14(3) of the connection portion 12. Also, the electrical connector 60 includes contact surfaces 65(4) and 65(5) each adapted to engage or otherwise interface with surfaces 14(4) and 14(5) of the connection portion 12. In addition, the electrical connector 60 includes contact surface 65(6) adapted to engage or otherwise interface with surface 14(5) of the connection portion 12.
The lead-in 65(3) brings the connector from about 2 mm to 0.2 mm of clearance with the connection portion 12. The contact surface or upper front lead-in 65(4) brings the connector fully forward (e.g., the last 0.2 mm) into engagement with the surface 14(5). In an embodiment, the contact surface 65(6) has a radius of about 0.5 mm to 0.6 mm, e.g., to accommodate any interference (e.g., up to about 0.4 mm interference) with the surface 14(5). The contact surface 65(6) also ensures that the pins 11 are never side loaded (e.g., bent) even if the mating surface 14(5) is skewed. As shown in FIG. 30, the surface 65(5) defines an angle a which may be 15° or under.
The surfaces 65(4) and 65(5) may not engage the surface 14(4), i.e., both clear the surface 14(4) as the connector is rotated into the connection portion. In an embodiment, the surface 65(4) may be relatively close or lightly touching so that engagement is insignificant. This arrangement ensures that the pins cannot be contacted on the side.
It is noted that the connector 60 is fully constrained within the connection portion 12 before a first one of the pins 11 is contacted. This arrangement ensures that the connector 60 is stable within the connection portion 12 before first pin contact which ensures that contact between the pins 11 and contact surfaces 62 is predictable.
FIG. 37-45 illustrate a PAP device/humidifier end cuff 330(1) according to another embodiment of the invention. In this embodiment, the cuff includes interior ribs 350 as described above. In addition, the rear side includes a second rear face or rib 70(2) spaced upwardly from the rear face or rib 67(2), e.g., see FIG. 40. A lead-in surface 70(1) is provided to the rear face 70(2). The lead-in surface 70(1) includes similar function and dimensions as the lead-in 65(4) on the front face (but in the opposite direction). Also, in an embodiment of the cuff 330(1), as shown in FIGS. 43 and 44, d1 is about 19-22 mm, e.g., 21 mm, d2 is about 19-22 mm, e.g., 21 mm, and d3 is about 11 mm.
While the invention has been described in connection with what are presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not to be limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Also, the various embodiments described above may be implemented in conjunction with other embodiments, e.g., aspects of one embodiment may be combined with aspects of another embodiment to realize yet other embodiments. Further, each independent feature or component of any given assembly may constitute an additional embodiment. In addition, while the invention has particular application to patients who suffer from OSA, it is to be appreciated that patients who suffer from other illnesses (e.g., congestive heart failure, diabetes, morbid obesity, stroke, bariatric surgery, etc.) can derive benefit from the above teachings. Moreover, the above teachings have applicability with patients and non-patients alike in non-medical applications.

## Claims

1. An air delivery conduit for use with an apparatus to deliver a supply of pressurized breathable air to a patient, the air delivery conduit comprising:
a flexible tube having a first end and a second end, the flexible tube including spiral ribbing from the first end to the second end; and
a one-piece cuff of continuous, homogeneous, and elastomeric material fixedly attached at each end of the flexible tube, each said one-piece cuff having a circular cross-section, and each said one-piece cuff comprising:
a first end portion having an internal surface fixed to an external surface of the flexible tube of the air delivery conduit and the spiral ribbing with a molded connection, and an external surface; and
a second end portion having an internal surface comprising the elastomeric material adapted to frictionally engage an exterior surface of a tubular connector and resist rotation of the one-piece cuff relative to the tubular connector,

wherein the second end portion includes an entry surface that is curved or chamfered along its length, the entry surface extending inwardly into the one-piece cuff from an outer edge of the second end portion to provide a lead-in for positioning the second end portion onto the tubular connector in use, and the entry surface providing an internal diameter that is dimensioned to be larger than an external diameter of the tubular connector, and
wherein the one-piece cuff further comprises a stop surface adjacent the first end portion and adapted to prevent the one-piece cuff from inserting onto the tubular connector beyond the depth of the stop surface, the stop surface being located at a maximum insertion distance of the tubular connector within the one-piece cuff.

2. The air delivery conduit according to claim 1, wherein the internal diameter of the entry surface is dimensioned to be about 0.5 to 10 mm greater than the external diameter of the tubular connector.

3. The air delivery conduit according to claim 2, wherein the internal diameter is dimensioned to be about 2-5 mm greater than the external diameter of the tubular connector.

4. The air delivery conduit according to claim 1, wherein an annular bead is provided on the internal surface of the second end portion axially inward from the entry surface, the annular bead providing an intermediate surface having an internal diameter that is dimensioned to be smaller than the external diameter of the tubular connector.

5. The air delivery conduit according to claim 4, wherein the intermediate surface is adapted to engage with a portion of the external surface of the tubular connector to retain the one-piece cuff on the tubular connector.

6. The air delivery conduit according to claim 5, wherein the engagement of the intermediate surface with the portion of the external surface of the tubular connector is adapted to provide a gas tight seal.

7. The air delivery conduit according to claim 4, wherein the internal diameter of the intermediate surface is dimensioned to be 0.1 to 5 mm less than the external diameter of the tubular connector.

8. The air delivery conduit according to claim 7, wherein the internal diameter of the intermediate surface is dimensioned to be about 1 mm less than the external diameter of the tubular connector.

9. The air delivery conduit according to claim 4, wherein the annular bead has a width that is dimensioned to be less than a maximum insertion distance of the tubular connector within the one-piece cuff.

10. The air delivery conduit according to claim 9, wherein the annular bead has a width of less than about 12 mm.

11. The air delivery conduit according to claim 9, wherein the width of the annular bead and the internal diameter of the intermediate surface are configured to provide a desired retention force to retain the one-piece cuff on the tubular connector under predetermined conditions.

12. The air delivery conduit according to claim 9, wherein the width of the annular bead is less than about 50% of the maximum insertion distance of the one-piece cuff.

13. The air delivery conduit according to claim 4, wherein the annular bead has a width that is tapered along its length, the annular bead having a larger width adjacent to the entry surface.

14. The air delivery conduit according to claim 4, wherein the intermediate surface is flat in an undeformed state.

15. The air delivery conduit according to claim 4, wherein the annular bead is structured to resiliently deform upon engagement with the tubular connector so as to provide a gas tight seal against the tubular connector and retain the one-piece cuff on the tubular connector.

16. The air delivery conduit according to claim 1, wherein the stop surface is axially inward from an annular bead that is axially inward from the entry surface.

17. The air delivery conduit according to claim 16, wherein the second end portion further includes an annular interior surface provided between the annular bead and the stop surface and having an internal diameter that is dimensioned to be between 0 to 5 mm greater than the external diameter of the tubular connector.

18. The air delivery conduit according to claim 17, wherein the internal diameter of the annular interior surface is dimensioned to be substantially the same as the external diameter of the tubular connector.

19. The air delivery conduit according to claim 17, wherein the internal diameter of the annular interior surface is dimensioned to be up to 1 mm greater than the external diameter of the tubular connector.

20. The air delivery conduit according to claim 1, wherein the stop surface comprises a flanged face.

21. The air delivery conduit according to claim 1, wherein the external surface includes grooves and a pair of raised finger grips, each raised finger grip comprising a single, continuous, and generally U-shaped protrusion projecting away from the external surface to facilitate manual attachment and detachment of the one-piece cuff to and from the tubular connector.

22. The air delivery conduit according to claim 21, wherein the raised finger grips do not extend beyond an outermost diameter of the second end portion.

23. The air delivery conduit according to claim 1, further comprising a thermistor adapted to connect to wires in the flexible tube.

24. The air delivery conduit according to claim 1, wherein the flexible tube has an internal diameter of about 15 mm and the tubular connector is a standard 22 mm external diameter ISO-taper tubular connector.

25. The air delivery conduit according to claim 1, wherein the internal surface of the first end portion of each one-piece cuff is fixedly attached to an exterior surface of the spiral ribbing.

26. The air delivery conduit according to claim 1, further comprising a step portion extending externally and circumferentially about the one-piece cuff, the step portion positioned between the first end portion and the second end portion.

27. The air delivery conduit according to claim 1, further comprising an external step portion positioned adjacent to the stop surface relative to the longitudinal axis of the one-piece cuff, the external step portion and the stop surface defining concentric circles.

28. The air delivery conduit according to claim 1, wherein the first end portion has an external diameter that is less than an external diameter of the second end portion.

29. An air delivery conduit for use with an apparatus to deliver a supply of pressurized breathable air to a patient, the air delivery conduit comprising:
a tube having a first end and a second end; and
a one-piece cuff that is constructed of an elastomeric material fixedly attached at each end of the tube, each said one-piece cuff having a circular cross-section, each said one-piece cuff comprising:
a first end portion having an internal surface attached to an external surface of the tube of the air delivery conduit with a molded connection; and
a second end portion having an interior retention surface adapted to frictionally engage an exterior surface of a tubular connector to resist rotation of the one-piece cuff relative to the tubular connector,

wherein the second end portion includes an external diameter that is larger than an external diameter of the first end portion,
wherein an interior surface of the one-piece cuff includes a stop surface positioned to prevent the one-piece cuff from being inserted onto the tubular connector beyond the stop surface, and the interior surface of the one-piece cuff includes an annular interior surface, positioned between the stop surface and the interior retention surface, the annular interior surface having an internal diameter larger than an internal diameter of the interior retention surface, and
wherein a step portion is positioned on an exterior surface of the one-piece cuff between the first end portion and the second end portion, wherein the stop surface is generally aligned with the step portion.

30. The air delivery conduit according to claim 29, wherein the stop surface comprises a flanged face.

31. The air delivery conduit according to claim 29, wherein the stop surface provides an indication that a maximum insertion distance of the tubular connector within the one-piece cuff has been reached.

32. The air delivery conduit according to claim 29, wherein the exterior surface of the first end portion includes grooves.

33. The air delivery conduit according to claim 29, wherein the first end portion includes a generally cylindrical exterior surface and a pair of generally U-shaped finger grips are provided to the generally cylindrical exterior surface of the first end portion to facilitate manual attachment and detachment of the one-piece cuff to and from the tubular connector, each generally U-shaped finger grip having a pair of legs and a base, and
wherein the legs of each generally U-shaped finger grip extend from the step portion to the base, the base located proximal to the tube.

34. The air delivery conduit according to claim 33, wherein the generally U-shaped finger grips extend along at least the first end portion.

35. The air delivery conduit according to claim 33, wherein the generally U-shaped finger grips extend substantially entirely across the first end portion.

36. The air delivery conduit according to claim 33, wherein the generally U-shaped finger grips do not extend beyond an outermost diameter of the second end portion.

37. The air delivery conduit according to claim 33, wherein each of the generally U-shaped finger grips includes an open end oriented towards the second end portion and a closed end positioned on the first end portion and adapted to be adjacent the tube.

38. The air delivery conduit according to claim 29, wherein the second end portion includes an entry surface that is curved or chamfered along its length, the entry surface extending inwardly into the one-piece cuff from an outer edge of the second end portion, the entry surface adapted to provide a lead-in for positioning the second end portion onto the tubular connector, and the entry surface providing an internal diameter that is dimensioned to be larger than an external diameter of the tubular connector.

39. The air delivery conduit according to claim 38, wherein the internal diameter of the entry surface is greater than the internal diameter of the interior retention surface, the interior retention surface being positioned axially inward from the entry surface, and the internal diameter of the interior retention surface being dimensioned less than the external diameter of the tubular connector.

40. The air delivery conduit according to claim 29, wherein the second end portion includes an entry surface adapted to provide a lead-in for positioning the second end portion onto the tubular connector, the entry surface extending inwardly into the one-piece cuff from an outer edge of the second end portion, and the entry surface providing an internal diameter dimensioned to be greater than a standard 22 mm tubular connector used in CPAP applications.

41. The air delivery conduit according to claim 29, wherein the stop surface is positioned in general alignment with an external flanged or stepped transition between the first end portion and the second end portion where the first end portion transitions to the larger second end portion, the stop surface and the external flanged or stepped transition defining concentric circles.

42. The air delivery conduit according to claim 29, wherein the tube has helical or spiral windings, and the interior surface of the first end portion of each cuff is fixedly attached to an exterior surface of the helical or spiral windings.

43. An air delivery conduit for use with an apparatus to deliver a supply of pressurized breathable air to a patient, the air delivery conduit comprising:
a tube having a first end and a second end; and
one-piece cuff that is co-molded, molded or adhered to at least one end of the tube, said one-piece cuff having a circular cross-section, and said one-piece cuff comprising:
a first end portion having an interior surface fixedly attached to an exterior surface of the tube of the air delivery conduit; and
a second end portion having an interior surface adapted to engage an exterior surface of a tubular connector associated with a mask, flow generator, or humidifier,

wherein the second end portion includes an external diameter that is larger than an external diameter of the first end portion,
wherein a stop surface is provided to an interior surface of the one-piece cuff to provide a stop adapted to prevent the one-piece cuff from inserting onto the tubular connector past the stop surface,
wherein the second end portion includes an entry surface extending inwardly into the one-piece cuff from an outer edge of the second end portion, the entry surface being adapted to provide a lead-in for positioning the second end portion onto the tubular connector, and the entry surface providing an internal diameter greater than an internal diameter of an internal friction surface axially inward from the entry surface and adapted to frictionally engage the tubular connector,
wherein the stop surface is generally aligned with an external flanged or stepped transition between the first end portion and the second end portion where the first end portion transitions to the larger second end portion, the stop surface and the external flanged or stepped transition defining concentric circles, and
wherein the first and second end portions comprise a single piece of deformable, elastomeric material.

44. The air delivery conduit according to claim 43, further comprising raised finger grips on the first end portion of the one-piece cuff,
wherein the raised finger grips do not extend radially outward beyond an outermost diameter of the second end portion. transitions to the larger second end portion, the stop surface and the external flanged or stepped transition defining concentric circles, and
wherein the first and second end portions comprise a single piece of deformable, elastomeric material.

45. The air delivery conduit according to claim 43, wherein the entry surface is curved or chamfered along its length.

46. The air delivery conduit according to claim 43, wherein the internal diameter of the entry surface is dimensioned to be larger than an external diameter of the tubular connector.

47. The air delivery conduit according to claim 43, wherein the stop surface comprises a flanged face.

48. The air delivery conduit according to claim 43, wherein the stop surface provides an indication that a maximum insertion distance of the tubular connector within the one-piece cuff has been reached.

49. The air delivery conduit according to claim 43, wherein the internal diameter of the entry surface is dimensioned to be greater than a standard 22 mm tubular connector used in CPAP applications.

50. The air delivery conduit according to claim 43, wherein the tube has helical or spiral windings, and the interior surface of the first end portion of each cuff is fixedly attached to an exterior surface of the helical or spiral windings.

51. The air delivery conduit according to claim 43, further comprising:
a finger grip having a raised portion disposed circumferentially about the exterior of the one-piece cuff and having a diameter greater than a diameter of an external surface of the first end portion and the second end portion.

52. The air delivery conduit according to claim 51, wherein the raised portion is continuous about the circumference of the one-piece cuff.

53. An air delivery conduit for use with an apparatus to deliver a supply of pressurized breathable air to a patient, the air delivery conduit comprising:
a tube having a first end and a second end; and
a one-piece cuff fixedly attached at each end of the tube, each said one-piece cuff having a circular cross-section, and each said one-piece cuff comprising:
a first end portion having an internal surface attached to an external surface of the tube of the air delivery conduit with a molded connection; and
a second end portion having an interior surface adapted to engage an exterior surface of a tubular connector, said first end portion and said second end portion comprising a single piece of a deformable elastomeric material,

wherein each said second end portion includes an external diameter that is larger than an external diameter of each said first end portion,
wherein a stop surface is provided to an interior surface of the one-piece cuff to provide a stop adapted to prevent the one-piece cuff from inserting onto the tubular connector past the stop surface,
wherein a step portion is positioned on an exterior surface of the one-piece cuff between the first end portion and the second end portion, the step portion extending substantially circumferentially around the exterior surface of the one-piece cuff,
wherein each said first end portion includes a generally cylindrical exterior surface and a pair of finger grips positioned on the generally cylindrical exterior surface at diametrically opposed locations to facilitate manual attachment and manual detachment of the one-piece cuff to and from the tubular connector, each said finger grip consisting essentially of a single, generally U-shaped protrusion that extends along at least each said first end portion and projects outwardly away from the generally cylindrical exterior surface, the generally U-shaped protrusion having legs and a base that protrude from the first end portion, and the step portion and the base and the legs of each said generally U-shaped protrusion enclose a surface that forms part of the generally cylindrical exterior surface,
wherein each of the legs provides rotational engagement with the patient's finger when the one-piece cuff is rotated by the patient about the circumference of the one-piece cuff,
wherein each base provides translational engagement with the patient's finger when the one-piece cuff is translated by the patient onto the tubular connector, said translational engagement occurring away from and facing towards the step portion, and
wherein each said generally U-shaped protrusion is open towards each said second end portion and each said generally U-shaped protrusion is closed on each said first end portion adjacent the tube.

54. The air delivery conduit according to claim 53, wherein the exterior surface of the first end portion includes grooves.

55. The air delivery conduit according to claim 54, wherein the finger grips extend along at least each said first end portion.

56. The air delivery conduit according to claim 55, wherein the finger grips extend substantially entirely across each said first end portion.

57. The air delivery conduit according to claim 56, wherein each said second end portion includes an entry surface that is curved or chamfered along its length, the entry surface extending inwardly into the one-piece cuff from an outer edge of the second end portion, the entry surface adapted to provide a lead-in for positioning each said second end portion onto the tubular connector, and the entry surface providing an internal diameter that is dimensioned to be larger than an external diameter of the tubular connector.

58. The air delivery conduit according to claim 57, wherein the stop surface comprises a flanged face.

59. The air delivery conduit according to claim 58, wherein the stop surface is positioned in general alignment with an external flanged or stepped transition between each said first end portion and each second end portion where each said first end portion transitions to each said larger second end portion, the stop surface and the external flanged or stepped transition defining concentric circles.

60. The air delivery conduit according to claim 59, wherein the internal diameter of the entry surface is greater than an internal diameter of an internal friction surface axially inward from the entry surface and adapted to frictionally engage the tubular connector, the internal diameter of the internal friction surface being dimensioned less than the external diameter of the tubular connector.

61. The air delivery conduit according to claim 53, wherein the step portion is positioned adjacent to the stop surface relative to the longitudinal axis of the one-piece cuff.

62. The air delivery conduit according to claim 53, wherein the finger grips do not extend beyond an outermost diameter of the second end portion.

63. The air delivery conduit of claim 53, wherein an outermost external diameter of the step portion is greater than the external diameter of the first end portion.

64. The air delivery conduit of claim 53, wherein an outermost external diameter of the step portion is greater than the external diameter of the one-piece cuff at the base of the generally U-shaped protrusion.

65. An air delivery conduit for use with an apparatus to deliver a supply of pressurized breathable air to a patient, the air delivery conduit comprising:
a tube having a first end and a second end, the tube having spiral ribbing;
at least one wire in the spiral ribbing;
a first cuff fixedly attached at the first end of the tube and said first cuff comprising:
a first end portion having an internal surface fixed to an external surface of the tube and the spiral ribbing, the first end portion having an external surface configured to be gripped by the patient;
a second end portion comprising an elastomeric material to frictionally engage an exterior surface of a tubular connector;
a thermistor connected to the at least one wire; and
a fixture protruding from the internal surface of the first end portion into a flow path of the supply of pressurized breathable air flowing through the first end portion of the first cuff, the thermistor being enclosed within the fixture; and

a second cuff fixedly attached at the second end of the tube and including an electrical connector connected to the at least one wire to provide an electrical connection with the apparatus.

66. The air delivery conduit according to claim 65, further including a stop surface between the first end portion and the second end portion of the first cuff and the stop surface oriented generally perpendicular to an insertion direction of the tubular connector to prevent the first cuff from inserting onto the tubular connector beyond the second end portion of the first cuff.

67. The air delivery conduit according to claim 66, wherein the stop surface is located at a maximum insertion distance of the tubular connector within the first cuff.

68. The air delivery conduit according to claim 66, further comprising an external step portion positioned adjacent to the stop surface relative to the longitudinal axis of the first cuff.

69. The air delivery conduit according to claim 65, wherein the tube has an internal diameter of about 15 mm and the tubular connector is a standard 22 mm external diameter ISO-taper tubular connector.

70. The air delivery conduit according to claim 65, wherein an external diameter of the second end portion of the first cuff is larger than an external diameter of the first end portion of the first cuff.

71. The air delivery conduit according to claim 65, wherein finger grips are provided to an exterior surface of the first end portion of the first cuff to facilitate manual attachment and detachment of the first cuff to and from the tubular connector.

72. The air delivery conduit according to claim 71, wherein the first end portion of the first cuff includes a generally cylindrical exterior surface and the finger grips include a pair of generally U-shaped recessions that extend along at least the first end portion of the first cuff and are located on opposite circumferential sides of the first cuff.

73. The air delivery conduit according to claim 71, wherein the finger grips do not extend beyond an outermost diameter of the second end portion.

74. The air delivery conduit according to claim 65, wherein the first cuff comprises a resilient material such that the first cuff is deformable to aid in removal of the first cuff from the tubular connector.

75. The air delivery conduit according to claim 65, wherein the at least one wire includes at least one heated wire such that at least a portion of the tube conducts heat.

76. The air delivery conduit according to claim 65, wherein the thermistor is molded into the fixture of the first cuff.

77. The air delivery conduit according to claim 65, wherein a temperature sensed by the thermistor is provided as a signal through the at least one wire to a controller of the apparatus.

78. The air delivery conduit according to claim 65, wherein the electrical connector includes three terminals configured to receive electrical contacts of the apparatus.

79. The air delivery conduit according to claim 65, wherein the second cuff includes a stop surface to limit insertion of the second cuff onto an apparatus tubular connector.

80. A PAP system for treatment of sleep disordered breathing, the PAP system comprising:
a PAP device to generate a supply of pressurized air;
a humidifier provided downstream of the PAP device to humidify the supply of pressurized air; and
the air delivery conduit of claim 65,
wherein the air delivery conduit is adapted to be connected to an outlet of the humidifier, and
wherein the at least one wire includes at least one heated wire to heat the air delivery conduit.

81. The air delivery conduit according to claim 65, further including a stop surface between the first end portion and the second end portion of the first cuff and the stop surface oriented generally perpendicular to an insertion direction of the tubular connector to prevent the first cuff from inserting onto the tubular connector beyond the second end portion of the first cuff,
wherein the tube has an internal diameter of about 15 mm and the tubular connector is a standard 22 mm external diameter ISO-taper tubular connector,
wherein an external diameter of the second end portion of the first cuff is larger than an external diameter of the first end portion of the first cuff,
wherein finger grips are provided to an exterior surface of the first end portion of the first cuff to facilitate manual attachment and detachment of the first cuff to and from the tubular connector,
wherein the first end portion of the first cuff includes a generally cylindrical exterior surface and the finger grips include a pair of generally U-shaped recessions that extend along at least the first end portion of the first cuff and are located on opposite sides of the first cuff,
wherein the first cuff comprises a resilient material such that the first cuff is deformable to aid in removal of the first cuff from the tubular connector,
wherein the tube includes spiral ribbing structured to support the at least one wire,
wherein the at least one wire includes at least one heated wire such that at least a portion of the tube conducts heat,
wherein the thermistor is molded into the fixture of the first cuff,
wherein a temperature sensed by the thermistor is provided as a signal through the at least one wire to a controller of the apparatus,
wherein the electrical connector includes three terminals configured to receive electrical contacts of the apparatus, and
wherein the second cuff includes a stop surface to limit insertion of the second cuff onto an apparatus tubular connector.

82. The air delivery conduit according to claim 65, further comprising a step portion extending externally and circumferentially about the first cuff, the step portion positioned between the first end portion and the second end portion.

83. The air delivery conduit according to claim 65, wherein the fixture extends from the internal surface of the first end portion in a direction perpendicular to a longitudinal axis of the first cuff.

84. The air delivery conduit according to claim 65, wherein the fixture is longer in a direction parallel to a flow direction of the supply of pressurized breathable air than in a direction perpendicular to the flow direction of the supply of pressurized breathable air.

85. The air delivery conduit according to claim 65, wherein the fixture is formed integrally with the first cuff.

86. The air delivery conduit according to claim 65, wherein the fixture is configured to provide convective heat transfer from the supply of pressurized breathable air to the thermistor over a range of flow rates.

87. The air delivery conduit according to claim 65, wherein an internal periphery of the second end portion of the first cuff includes an entry surface that is curved or chamfered along its length to provide a lead-in for positioning the second end portion onto the tubular connector in use, the entry surface extending inwardly into the second cuff from an outer edge of the second end portion, and the entry surface providing an internal diameter that is dimensioned to be larger than an external diameter of the tubular connector.

88. An air delivery conduit for use with an apparatus to deliver a supply of pressurized breathable air to a patient, the air delivery conduit comprising:
a tube having a first end and a second end, the tube having spiral ribbing;
at least one wire in the spiral ribbing;
a first cuff fixedly attached at the first end of the tube and said first cuff comprising:
an internal surface fixed to the tube and the spiral ribbing;
an external surface configured to be gripped by the patient;
an end portion positioned opposite the tube and the end portion comprising an elastomeric material to frictionally engage a tubular connector of the apparatus; and
a thermistor supported within a flow path of the supply of pressurized breathable air flowing through the first cuff by a fixture that extends from the internal surface of the first cuff to optimize convective heat transfer over a range of flow rates, the thermistor enclosed within the fixture, and the thermistor connected to the at least one wire; and

a second cuff fixedly attached at the second end of the tube and including an electrical connector connected to the at least one wire to provide an electrical connection with the apparatus.

89. The air delivery conduit according to claim 88, wherein the first cuff further comprises a stop surface that is oriented generally perpendicular to an insertion direction of the tubular connector to prevent the first cuff from inserting onto the tubular connector beyond the end portion of the first cuff.

90. The air delivery conduit according to claim 88, wherein finger grips are provided to an exterior surface of the first cuff to facilitate manual attachment and detachment of the first cuff to and from the tubular connector.

91. The air delivery conduit according to claim 88, wherein the at least one wire includes at least one heated wire such that at least a portion of the tube conducts heat.

92. The air delivery conduit according to claim 88, wherein the thermistor is molded into the fixture of the first cuff.

93. The air delivery conduit according to claim 88, wherein the fixture extends from the internal surface of the first cuff in a direction perpendicular to a longitudinal axis of the first cuff.

94. The air delivery conduit according to claim 88, wherein the fixture is longer in a direction parallel to a flow direction of the supply of pressurized breathable air than in a direction perpendicular to the flow direction of the supply of pressurized breathable air.

95. A PAP system for treatment of sleep disordered breathing, the PAP system comprising:
a PAP device to generate a supply of pressurized air;
a humidifier provided downstream of the PAP device to humidify the supply of pressurized air; and
the air delivery conduit of claim 88,
wherein the air delivery conduit is adapted to be connected to an outlet of the humidifier, and
wherein the at least one wire includes at least one heated wire to heat the air delivery conduit.

96. The PAP system according to claim 95, further comprising a controller,
wherein a temperature sensed by the thermistor is provided as a signal through the at least one wire to the controller.

97. The PAP system according to claim 95, wherein the electrical connector includes three terminals configured to communicate with electrical contacts of the PAP system.