The invention is characterized in that the socket and the plug can be tightly jointed to improve the joint strength and avoid incorrectmanipulation 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.