To compare the occur rate of local infection and catheter plug.
比较其局部感染和导管堵塞发生率。
Observe the length of retention time, as well as the occurrence of phlebitis, catheter extrusion, plug and so on.
观察留置时间的长短，以及静脉炎的发生、导管脱出、堵塞等情况。
The colour Doppler, balloon exploration of the detective and a catheter scale examination of the foam plug were used for choice of patients, measurement of PDA dilated diameter and plug closure.
以彩色多普勒，球囊导管探测PDA大小，结合导管尺测量塞子并实施堵塞术。
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