| 摘要 |
A catheter is provided having a main section (34) with proximal and distal ends and including an inner tube (48). An outer tube (46) extends along a longitudinal axis and combines with the inner tube to define an annular intake lumen (50), and a tubular tip section (38) is included having a smaller cross-section than the main section. The tip section has a return opening (42,44) and a transition portion (36) is at the distal end of the main section (34). The transition portion is formed of material provided in overlapping parts (58,60,62) of the inner tube inside the tip section which is inside the outer tube. The inner tube blends into the tip section at the transition portion and the outer tube blends smoothly into the tip section with the intake lumen (50) ending at the transition portion. An outlet lumen is formed by the inner tube and the tip section and ends at the outlet opening. <IMAGE> |
