Establishing intravenous access is commonly understood to mean sticking an intravenous needle in and having a channel through which medications can be applied. In fact, when this phrase is mentioned in medical practice, it usually excludes routine intravenous infusions for the average patient. This is a serious-sounding topic, and that’s actually what it is. It is usually said when resuscitation is started for acute, critical or severe patients. Without intravenous access, the physician is essentially useless even at the highest level. Moreover, in acute, critical and severe patients, once the condition starts to worsen and shock occurs, the peripheral veins will collapse, and then it will become very difficult to tie the normal intravenous needles and delay the resuscitation time. Therefore, once the resuscitation treatment is to be carried out, it is necessary to race against time to establish effective venous access immediately. Usually, at least two intravenous channels are required to establish so that medication can be administered more easily. This can be done through a peripheral vein, through a central vein or through a saphenous vein cut.