| 摘要 |
A device for drawing fluid from a lumen, and particularly blood from a blood vessel, is disclosed. The device may provide indication of the entry of an intravenous cannula into the lumen. The device may include a central body having an outer wall and an inner fluid passage. The outer wall of the central body may be transparent or translucent to permit the detection of fluid within the inner fluid passage. A front cannula may extend from one end of the central body and a rear cannula may extend from the other end of the central body. Both the front and rear cannulae may communicate with the inner fluid passage or be part of a continuous cannula extending through the inner fluid passage. A guide tube including a well may be connected to the central body. A second cannula may extend into the guide tube from the well. A flexible sleeve may extend into the guide tube from the well and surround at least a tip portion of the rear cannula or a tip portion of the second cannula. A venting member may be provided near the juncture of the well and the flexible sleeve. The venting member may permit the passage of air through it, but be substantially impermeable to liquids, such as blood.
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