| 摘要 |
A tubular member useful as an inner liner for the working channel of a flexible endoscope has a distal portion which is specially treated to make it highly flexible and resistant to kinking or collapsing when it bends with the flexible section of the endoscope. The tubular member is also useful as a catheter device or as a component of a catheter device or catheter system. A helically wound wire is drawn into the wall of the tubing to prevent kinking or buckling of the wall or collapsing of the inner lumen. External ridges may be formed by convolutions of the tubing wall or by external threads that are formed on the exterior of the tubing wall within the flexible distal portion. An outer helical reinforcing coil may be added between the external ridges to further reinforce the flexible distal portion of the tubular member from kinking or collapsing. The flexible distal portion of the tubular member may be coated with a layer of a flexible polymer to fill in the spaces between the external ridges and to cover the helical reinforcing coil. Manufacturing methods for the tubular member are also disclosed.
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