关键词】静脉留置针，防逆流；静脉炎；堵管；护理 [gap=1140]Key words： venous indwelling needle，anti-counter-flow；phlebitis；tube blockage； nursing
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观察留置时间与堵管率。
Then the indwelling time and tube-blocking rate were observed.
施工中常出现堵管，由于处理不当而形成断桩，造成经济损失。
Because the pipe plugging always occurs in construction this cause the pile break and make economic losses.
本文对结晶堵管作一肤浅分析，并提出三种解决措施供采卤同行参考。
Brief analysis on pipe plugging by salt crystallization is made and three measures are cited to the colleagues for reference.
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