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。
Objective: to assess the value of central venous catheter in treatment of refractory urinary retention in children.
目的：评估深静脉导管在小儿困难导尿中的应用价值。
Infants; Intravenous catheter system; Sealing liquid; Sealing effect; Retention time.
婴幼儿；静脉留置针；封管液；封管效果；留置时间。
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