The word syringe is a term that comes from the Greek “syrinx” which means “tube”. A syringe is a cylindrical instrument, made of glass, metal or plastic, which has inside it a plunger that sucks or pushes liquids, as the case may be, and with a tip that ends in a cannula, where a hollow needle is included. that is penetrated into the area of ​​the body, in which you want to introduce or extract a liquid. The disposable plastic syringes that are currently used were invented by the Spanish Manuel Jalón, an aeronautical engineer by training and an air force officer and inventor. This kind of syringe was easy to manufacture and very cheap.

The syringe is used to introduce small portions of liquids into the body or to extract samples from it. It is usually filled by submerging the needle in the liquid and pulling the plunger, then the needle is placed upwards and the cylinder is pressed to expel the air bubbles that have been lodged in it, then the needle is inserted and the liquid inside is expelled. body by pressing on the plunger, this procedure is called an injection.

Syringes come in various sizes and for different uses, however, there are four types of syringes that are most used:

The insulin syringe is a type of syringe that can be identified very easily. It has a barrel with measurements to calculate insulin in units of 50 to 100, these contain 1 cc of liquid, with a half-inch needle, this kind of syringe is designed to be used only once.

The tuberculin syringe is the one that has a 1cc barrel. Its design is used to perform tuberculosis tests, in order to diagnose the disease. To carry out this test, only a dose of 0.1cc is needed, as this is a very small amount, it cannot be measured with other syringes, however, this type of syringe can be used for the application of other injectable medicines of little amount, normally the syringe does not have a needle, so the person is free to choose the appropriate size to be used.

Medical syringes are of various sizes, usually between 3cc to 120cc and come with two kinds of tips, the first is the Luer lock type, these syringes have a spiral tip to securely join the needles. and other accessories, such as saline or intravenous tubes. The other class is the catheter tip, these have an elongated smooth nozzle, where Foley catheters and feeding tubes can be connected.