Hypodermic syringe, esp. for diabetics to inject insulin

摘要

Hypodermic syringe has a tubular housing (1) to hold an ampoule, and a sliding sleeve (5) which covers the injection needle (3). The free end side (6) of the sleeve (5) contains a liquid or paste dye held by the sleeve material to act as a stamp, or the sleeve (6) wall is hollow, to contain a dye, and the free end side (6) of the sleeve (5) is permeable to the dye.