| 摘要 |
The invention provides a dual lumen catheter (20) comprising outer and inner tube materials (28, 30). A main portion (22) extends axially and has a selected first cross section and includes main portions of the respective outer and inner tube materials which tog ether define an annular intake lumen (32) and a main part of a return lumen (34) containe d inside the intake lumen. A transition portion (67) is made up integrally of both the outer and inner tube materials and has a second cr oss section smaller than the first cross section. The tr ansition portion extends axially from the distal end of the main portion and this can be extended to include a tip portion (65) made up only of outer tube material and which extends axially from the transition portion. The tra nsition portion on its own, or with the tip portion, def ines a tip section (26) which is a continuation of said main part of the return lumen t o complete the return lumen. A method of manufacturing t he catheter is also disclosed.
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