The price is low, there is no risk of blood-borne infection, and it has been widely used clinically. Due to the large friction between the needle barrel and the needle plug, the withdrawal needle plug can easily cause the needle to move out of the artery, and hemolysis or air mixing into the blood specimen affects the accuracy of the test results. In addition, the performance of disposable syringes is unstable, and some studies have shown that PaO2 of disposable syringes begins to decline within 15 minutes, and specimens need to be sent for inspection within 15 minutes.