It is mainly used for clinical venous transfusion; It is composed of air inlet device, protective cover of bottle stopper puncture device, bottle stopper puncture device, blood filter screen, drip tube, drip bucket, catheter, flow regulator, outer conical connector, protective cover of outer conical connector and intravenous infusion needle. 1. Disposable; 2. Sterility; 3. No pyrogen and hemolysis; 4. Ethylene oxide sterilization