The insulin pen we often say is somewhat similar to the ballpoint pen we usually use for writing. It is composed of the body, the core and the needle. The pen cartridge is filled with insulin solution. When using the pen cartridge, the pen cartridge is put into the body of the pen, and then the needle is inserted. The dosage is selected, the skin is disinfected, and the needle is inserted into the skin. Because it is easy to use, simple, fast, so many sugar friends become the first choice.
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