Heparin cap, a auxiliary medical instrument, is mainly used as injection way and injection port, widely accepted and approved by medical institutions. Heparin cap is very normal in morden medical line, it plays a very important role when used together with I.V. cannula and central venous catheter. Heparin cap has various advantages such as: safe, sanitation, durable puncture, good sealing, small volume, convenient use, the foremost advantage is to release patients’ pain/ injury while injection and infusion.