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In page Central venous catheter:
"Specific types of long-term central lines are the Hickman catheters, which require clamps to make sure that the valve is closed, and Groshong catheters, which have a valve that opens as fluid is withdrawn or infused and remains closed when not in use. Hickman lines also have a "cuff" under the skin, to prevent bacterial migration.[citation needed] The cuff also causes tissue ingrowth into the device for long term securement.
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