| 摘要 |
A tracheostomy tube includes an outer cannula (12) and a removable, disposable inner cannula (14). The inner cannula is provided with a tapered portion located just behind its distal tip (38) which forms simultaneously an air tight seal with the outer cannula and a stop device for preventing the protrusion of the tip substantially beyond the end (16) of the outer cannula. The stop device furthermore compensates for variations in the length of the inner cannula by controlling the position of the tip (38) between a location flush with the end (16) of the outer cannula and one just slightly beyond. A coupling connector (28) is mounted on the proximal end of the inner cannula to provide easy, releasable attachment of the inner cannula to the outer cannula. The inner cannulae are inexpensively constructed from a soft, flexible polyvinyl chloride material and are dimensionally compatible with any particular outer cannula. |
