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Condensation or “rain-out” is a problem in breathing circuits and especially neonatal breathing circuits. The subject patent provides an improved breathing tube component for managing rain-out particularly in neonatal applications. In particular the breathing tube has a smooth inner bore, and an out

Condensation or “rain-out” is a problem in breathing circuits and especially neonatal breathing circuits. The subject patent provides an improved breathing tube component for managing rain-out particularly in neonatal applications. In particular the breathing tube has a smooth inner bore, and an outer insulating layer containing stagnant gas and a heater wire.

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1. An inspiratory breathing tube configured for connecting to an outlet of a humidifier, comprising: a smooth inner wall surface defining a breathing gases passage;a corrugated external outer wall surface;a space insulating the inner wall surface from the outer wall surface, the space containing a s

1. An inspiratory breathing tube configured for connecting to an outlet of a humidifier, comprising: a smooth inner wall surface defining a breathing gases passage;a corrugated external outer wall surface;a space insulating the inner wall surface from the outer wall surface, the space containing a substantially stagnant gas; anda heater located outside the inner wall surface and comprising at least one heater wire, the heater wire embedded in a wall of the inspiratory breathing tube and arranged helically with respect to an axis of the inspiratory breathing tube. 2. An inspiratory breathing tube as claimed in claim 1, wherein the at least one heater wire has a first end and a second end, the heater wire forming an electrical loop so that the first and second ends are located on a same end of the inspiratory breathing tube. 3. An inspiratory breathing tube as claimed in claim 1, wherein the heater comprises a pair of heater wires forming two separate runs joined at a patient end of the inspiratory breathing tube. 4. An inspiratory breathing tube as claimed in claim 1, wherein the at least one heater wire carries signals for sensing devices located along the inspiratory breathing tube. 5. An inspiratory breathing tube as claimed in claim 4, wherein the sensing devices comprise at least one of temperature, humidity, flow, pressure sensors and combinations thereof. 6. An inspiratory breathing tube as claimed in claim 1, further comprising additional wires for sensing at least one of temperature, humidity, flow, pressure and combinations thereof. 7. An inspiratory breathing tube as claimed in claim 1, wherein the inspiratory breathing tube is part of a respiratory therapy system for delivering high flow therapy to an adult patient up to 60 L/min. 8. An inspiratory breathing tube as claimed in claim 1, wherein the inspiratory breathing tube has an inner diameter of between 15 mm and 30 mm. 9. An inspiratory breathing tube as claimed in claim 1, wherein the inspiratory breathing tube has an inner diameter of between 16 mm and 25 mm. 10. An inspiratory breathing tube as claimed in claim 1, wherein the inspiratory breathing tube is part of a respiratory therapy system for delivering high flow therapy to an infant patient up to 10 L/min. 11. An inspiratory breathing tube as claimed in claim 1, wherein the inspiratory breathing tube has an inner diameter of between 3 mm and 15 mm. 12. An inspiratory breathing tube as claimed in claim 1, wherein the inspiratory breathing tube has an inner diameter of between 6 mm and 10 mm. 13. An inspiratory breathing tube as claimed in claim 1, wherein the inspiratory breathing tube has an inner diameter of between 7 mm and 9 mm. 14. An inspiratory breathing tube as claimed in claim 1, wherein the heater wire is embedded in the inner wall. 15. An inspiratory breathing tube as claimed in claim 1, wherein the inner wall and the outer wall are separate from each other and allow for relative movement between the inner wall and the outer wall. 16. An inspiratory breathing tube as claimed in claim 1, wherein the inner wall and the outer wall are spaced from each other around an entire circumference and along an entire length of the inspiratory breathing tube. 17. An inspiratory breathing tube as claimed in claim 1, comprising an inner tube comprising the smooth inner wall surface and an inner tube outer surface, and an outer tube comprising an outer tube inner surface and the corrugated external outer wall surface, the heater wire disposed between the inner tube outer surface and the outer tube inner surface. 18. An inspiratory breathing tube as claimed in claim 17, wherein the inner tube outer surface is smooth. 19. An inspiratory breathing tube as claimed in claim 17, wherein the inner tube and the outer tube are separate and spaced from each other and allow for relative movement therebetween. 20. A respiratory therapy system comprising: a humidifier,a gases source configured to be coupled to an inlet of the humidifier; andan inspiratory breathing tube configured to be coupled to an outlet of the humidifier, the inspiratory breathing tube comprising a smooth inner wall surface defining a breathing gases passage;a corrugated external outer wall surface;a space insulating the inner wall surface from the outer wall surface, the space containing a substantially stagnant gas; andat least one heater wire embedded in a wall of the inspiratory breathing tube outside the inner wall surface, the at least one heater wire arranged helically with respect to an axis of the inspiratory breathing tube. 21. A respiratory therapy system as claimed in claim 20, wherein the humidifier comprises a humidification chamber containing water, a heater plate, and a controller. 22. A respiratory therapy system as claimed in claim 21, wherein the humidification chamber comprises an aluminum base configured to be in contact with the heater plate. 23. A respiratory therapy system as claimed in claim 21, wherein the controller controls the heater plate to heat the water within the humidification chamber in response to a user input. 24. A respiratory therapy system as claimed in claim 21, wherein the inlet and the outlet of the humidifier are on the humidification chamber so that water vapor formed by heating the water leaves the outlet with a flow of gases entering through the inlet from the gases source. 25. A respiratory therapy system as claimed in claim 20, further comprising a patient interface connected to the patient end of the inspiratory breathing tube. 26. A respiratory therapy system as claimed in claim 25, wherein the patient interface is a nasal mask, an oral mask, or a full-faced mask.