The syringe is a common medical appliance. As early as the 15th century, the Italian Catinel proposed the principle of syringes. It is mainly used to extract or inject gases or liquids with a needle. Syringes can also be used for medical devices, containers, such as some chromatography in the scientific instruments injected through a rubber septum.
Syringe, needle specifications and uses
Subcutaneous injection 1ml 4.5 ~ 5
Intramuscular injection ?2.5ml 5.5 ~ 6
Intravenous injection, intravenous blood collection 2.5ml 10ml ? 6.5～7
5 10 20 50ml ?6, 7,8,9
Description: The thickness of the needle is expressed in terms of the number, generally 4.5, 5, 6, 7, etc. No. 7 is the diameter of the needle is 0.7 millimeters (may be the outer diameter) generally used by children with a No. 4.5 or No. 5. Adults use No. 7.
22G is a No. 7 needle in China! 30G is No. 3! 28G is No. 3.5! 27 is No. 4! 26 is No. 4.5! 25 is No. 5! 24 is No. 5.5! 23 is No. 6! 22 is No. 7! 21 is No. 8!
Each size of syringe corresponds to a different type of needle, it is recommended that you can go to the hospital to give examination and treatment. What is the structure and specification of a needle? The needle consists of three parts: the tip, the stem, and the plug (the common models are 4.5, 5, 5.5, 6, 6.5, 7, 8, and 9).
References
Globe. Globe[cited 2018-5-8]