| 摘要 |
A fluid flow control device includes a structural body forming a channel. A sheath is coupled to a first end of the structural body and has a tip. The sheath defines a passage in flow communication with the channel. A needle is movably positioned within the channel. The needle is movable between a retracted position seated within the channel and an extended position extending through the passage and outwardly with respect to the tip. A port defines a second passage at an opposing second end of the structural body. The second passage is in flow communication with the channel.
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