The all-glass syringe barrel is divided into two parts: the first half is the liquid medicine, the middle is the piston, and the back half is the sealed high-pressure gas chamber (providing injection power to push the piston to inject the liquid medicine in the front).
The needle head of the syringe is tied to a small rubber plug, which plays a blocking role before launching. The tail of the syringe has a tail that stabilizes the flight. After firing through the blowpipe, the needle pierces the plug in sequence after contacting the target animal. The rubber stopper and animal skin reach the muscle layer (the needle blockage is released), and then the high-pressure air at the back of the syringe pushes the piston to inject the liquid into the animal's muscle, which has the effect of treatment or anesthesia.
The syringe consists of a syringe with a small hole in the front end and a matching piston core rod. It is used to inject a small amount of liquid or to draw into or out of areas that are not accessible by other methods. When the core rod is pulled out, the liquid Or the gas is sucked from the small hole at the front end of the syringe, and the liquid or gas is squeezed out when the mandrel is pushed in.
Syringes can also be used to inject medical devices, containers, and scientific instruments such as some chromatography methods through a rubber septum. Injecting gas into the blood vessel will cause air embolism. The way to remove air from the syringe to avoid embolism is to invert the syringe, tap it gently, and then squeeze out a little liquid before injecting it into the bloodstream.
In some occasions where accuracy is not the primary concern of bacteria, such as quantitative chemical analysis, glass syringes are still used because of small errors and smooth movement of the push rod.
In addition, the plunger in the syringe is allowed to move along the syringe within a certain range. During storage, transportation, and sales, when in a low-pressure environment, plunger movement caused by pressure changes may potentially affect the integrity of the seal. Therefore, it is necessary to evaluate the integrity of the plunger seal under these special conditions.