| 摘要 |
A respiration catheter has a sealing cuff (12) which encircles the catheter tube (10) and can be connected through a separate tube (13, 14) with a source of compressed air with a substantially constant pressure. This tube accommodates a cut-off valve (19, 20, 21) which is controlled by the pressure of the respiration air and is adapted to prevent air in the sealing cuff from escaping when this pressure exceeds the pressure in the source of compressed air. The position of this cut-off valve in the vicinity of the free end of the catheter tube obviates the disadvantageous effects of pressure drops in the catheter tube, which may occur when the valve is placed at the injection end of the catheter tube, as is the case in a known respiration catheter.
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