At present, many diabetic patients worldwide still use syringes as the main injection device. Syringes with removable needles are not suitable for insulin injection, syringes with fixed needles reduce dead volume, high dose accuracy, and insulin can be mixed as needed. In addition, insulin-specific syringes are inexpensive compared to insulin-injected pens and are easily accepted by patients. However, the disadvantage is that when using a syringe for insulin, it is necessary to inhale insulin before each injection, which is inconvenient to carry and inject, which is not conducive to increasing the accuracy of the injected dose.
