Syringe, needle specifications and models are as follows:
Subcutaneous injection of 1ml 4.5 ~ 5, intramuscular injection of 2.5ml 5.5 ~ 6, intravenous injection, venous blood collection of 2.5ml10ml6.5 ~ 7,
Instructions: the thickness of the needle with a number of numbers to indicate that there are generally 4.5, 5, 6, 7, etc., the No. 7 is that the diameter of the needle for the 0.7 millimeters (may be the outer diameter) generally children with 4.5 or 5, adults with 7.
Needles are hollow metal needles that can be freely loaded and unloaded at the head end of the syringe. For safety and hygiene reasons, disposable needles should be discarded after use and not reused.
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Extended Information: Use of Syringes Syringes can also be used for injecting through a rubber septum in medical devices, containers, and, in some cases, in chromatography, scientific instruments. 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 error margins 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. The syringe can also be used to refill ink into cartridges. Model Specifications Typically 2 ml, 5 ml, 10 ml, or 20 ml syringes are used, occasionally 50 ml or 100 ml, and 1 ml syringes are used for intradermal injections. Syringe barrels can be made of either plastic or glass and usually have a graduated indication of the volume of fluid in the syringe. Glass syringes can be sterilized in an autoclave, but because plastic syringes are cheaper to dispose of, most modern medical syringes are made of plastic, which further reduces the risk of blood-borne diseases. Transmission of disease among intravenous drug users, especially HIV and hepatitis, has been linked to the reuse of needles and syringes. Reference: