The hollow member (3) has an opening (32) which allows the transfer of the puncture needle (41) when the puncture needle (41) is transferred in the puncture direction (N1).
中空部件（3）具有开口部（32），该开口部用于在使穿刺针（41）沿穿刺 方向（N1）移动时允许穿刺针（41）的移动。
Points function can divide into a needle shape can transfer throttle, Tube of shape can transfer throttle.
按功能可分为针形可调节流阀、筒形可调节流阀。
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