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1·The invention is characterized in that the socket and the plug can be tightly jointed to improve the joint strength and avoid incorrect manipulation of positive-negative power supply can be avoided.

本发明可使插头与插座紧固联接，提高联接强度及避免正负电源误操作。

2·As a conventional clinical manipulation, patients underwent indwelling urinary catheter were prone to get urinary system infection because of incorrect handling.

留置导尿是临床上一项常规操作，但如果操作不当，易引起泌尿系感染。