The specifications and models of syringes and needles are as follows:
Subcutaneous injection of bai injection 1ml 4.5～5, intramuscular injection 2.5ml 5.5～6, intravenous injection, intravenous blood collection 2.5ml 10ml 6.5～7,
Note: The thickness of the needle is expressed by the number of gauges, generally 4.5, 5, 6, 7, etc., the 7 is the needle with a diameter of 0.7 mm (may be the outer diameter), generally children use 4.5 or 5, adults use Number 7.
The needle is a hollow metal needle with the tip of the syringe freely removable. For the sake of safety and health, the disposable needle should be discarded after use and cannot be reused.
The syringe barrel can be made of plastic or glass, and usually has a scale indicating the volume of liquid in the syringe.
Glass syringes can be sterilized with an autoclave, but because the processing cost of plastic syringes is low, most modern medical syringes are made of plastic, which further reduces the risk of blood-borne diseases.