Application of Y type of anti-hurting i.v. cathete, nurses are greatly reduced the incidence of needle sticking injuries and blood pollution, ensuring the safety of the nurse operation. Closed anti-hurting i.v catheter through the scalability design, after removing the meral needle, needlepoint automatically withdraw its tip inside the hedge, and permanently recover, hedge reliably protect both doctors from scratches and the threat of the needle, which play an important role to prevent infection of medical staff from any risk of blood-borne infectious disease.