The product consists of a puncture device, a protective sleeve, a bottle stopper, a puncture device, an air inlet with an air filter, an air filter, a liquid ventilation duct, a dropper, a drip pipe, a flow regulator, an injection piece, a pharmaceutical filter, an external conical joint, a disposable infusion device, a pharmaceutical filter membrane with a nominal filtration aperture of 15um. The disposable infusion needle is used for intravenous clinical infusion of drugs, and is only used for gravity infusion.