Improving the automation of the process of needle insertion can reduce the operator’s man-made factors such as skill level requirements, improve the accuracy and efficiency of needle insertion, and minimize the injuries of patient\'s organs and major vascular.

Application of negative pressure needling for patients in cardiovascular department;

From clinical experiences,this paper discusses how to improve the injection way in intravanous injection,how to relief the patient and how to handle the special cases,so as to make the intravenous injection more effective and gain precious time in the act of saving person.