| 摘要 |
PROBLEM TO BE SOLVED: To provide a corrugated tube for a respiration circuit (a respiration tube) capable of reducing the cost while maintaining the safety. SOLUTION: Hot water is fed into a first channel 50 from an end of the channel. The fed hot water reaches an end on the downstream side of the first channel 50 (the center right end in the figure), where the hot water enters a second channel 60, then returns to the original position. During the period, the hot water heats a wall surface of an internal tube 10 while spirally moving between the internal tube 10 and an external tube 20. Decline of temperature of expired air or inspired air inside the corrugated tube can be prevented by the heating. Furthermore, if an electric wire 70 is electrified, the generated heat can also prevent the decline of temperature of expired air or inspired air inside the corrugated tube. Even if the electric wire 70 is overheated, part of the heat can be absorbed in the hot water in the channels. In addition, by detecting the quantity of returned hot water, a breakage in the corrugated tube can be detected. COPYRIGHT: (C)2005,JPO&NCIPI
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