Syringe is a common medical appliance. As early as the 15th century, the Italian cartinel put forward the principle of syringe. It mainly uses a needle to extract or inject gas or liquid. Syringes can also be used for medical equipment, containers, such as some scientific instruments in chromatography, through the rubber diaphragm injection.
The emergence of syringes is an epoch-making revolution in the field of medical appliances. The process of extracting and injecting gas or liquid with a needle is called injection. The syringe is composed of a syringe with a small hole in the front end and a matching piston core rod, which is used to inject a small amount of liquid or it into or extract from the inaccessible areas by other methods. When the core rod is pulled out, the liquid or gas is inhaled from the small hole in the front end of the syringe, and the liquid or gas is extruded when the core rod is pushed in.