Anti-reflux peripherally inserted central catheter

The utility model relates to a medical appliance, in particular to an anti-reflux peripherally inserted central catheter, which comprises a peripherally inserted central catheter (PICC), a connecting seat, an extension tube, a stepped tube, a circular plate and an elastic piece. When the injection liquid extrudes and impacts the circular plate from the first pipeline, the elastic piece retracts, the circular plate moves downwards, the first pipeline is communicated with the second pipeline, infusion is conducted, and when the liquid infusion is finished or the venous pressure is larger than the infusion gravity, the elastic piece automatically retracts to the original position, the circular baffle blocks the first pipeline, and the circular baffle blocks the second pipeline. Therefore, the problem that the blood flows back to the intravenous infusion device, so that the adverse reaction of a patient is caused is effectively prevented. 本实用新型涉及一种医疗器械用品，尤其涉及一种防逆流经外周中心静脉导管，包括PICC管、连接座、外延管、阶梯形管、圆板和弹性件，本实用新型通过在外延管处