The principle of "hydraulic pressure" is used for liquid transportation. Through the action of force, the liquid is pushed from the place of high pressure to the place of low pressure. Under atmospheric pressure, the liquid in the bottle flows down the thin infusion hose into the drip bucket, and when the pressure of the water column in the drip bucket is greater than the venous pressure, the liquid in the bottle flows down the hose into the vein.
The syringe consists of a barrel with a small hole in the front end and a matching piston mandrel for injecting small amounts of liquid or its into areas inaccessible by other means or for withdrawing it from those areas, the liquid or gas being drawn in through the small hole in the front end of the barrel while the mandrel is withdrawn, and squeezed out as the mandrel is pushed in.
The emergence of the syringe was an epochal revolution in the field of medical devices and the process of extracting or injecting a gas or liquid with a needle is called injection.
Expanded Information:
Injections are used in medical equipment, medical devices, and other medical devices. p>Syringes are used for medical devices, containers, and scientific instruments such as those used in some chromatography to inject through a rubber septum. Injecting gas into a blood vessel will result in an air embolism. Air is removed from the syringe to avoid embolization by inverting the syringe, tapping it gently, and squeezing out a small amount of fluid before injecting it into the bloodstream.
In settings where precision is not the primary concern for germs, such as in quantitative chemical analysis, glass syringes are still used because of their small margin of error and smooth pushrod movement.
Syringes can also be used to inject some juices into meat when cooking to improve flavor and texture, or into pastries when baking. Syringes can also be used to refill ink into cartridges.
Baidu Encyclopedia - Syringe