| 摘要 |
A branching device for a blood vessel has a sleeve (10), which is radially extensible and has an opening (12) in its circumferential surface, and a collar (11) consisting of a fluid-tight material and fixed to the sleeve before the branching device is used. The collar has on the one hand a shoulder portion (13), which extends at least around the opening in the circumferential surface of the sleeve, and, on the other hand, a neck portion (14) integral with the shoulder portion and projecting radially from the opening in the circumferential surface of the sleeve.
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