| 摘要 |
An intravascular catheter, comprising a hub having a pair of branched tubes mounted thereto apart from each other in the axial direction of the hub, a flexible double-walled tube having an inwardly tapered tip portion and consisting of an inner tube and an outer tube coaxial with the inner tube, and a needle removably inserted into the inner tube of the double walled tube. The base edge of the inner tube is located at an intermediate portion between the positions from which the pair of the branched tubes extend outward so as to enable the inner passageway formed in the inner tube to communicate with one of the branched tubes. The base edge of the outer tube is fixed to the tip of the hub so as to enable the annular passageway formed between the outer wall of the inner tube and the inner wall of the outer tube to communicate with the other branched tube. Further, the inner passageway has an opening at the tapered tip of the double-walled tube and the forward end of the annular passageway communicates with a bore or bores provided at the forward end portion of the outer tube.
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