The invention discloses a disposable self-limiting and self-stopping transfusion
system, which comprises a
bottle plug puncture unit protecting jacket, a
bottle plug puncture unit, an air filtering membrane, an air plug, an upper flexible
pipe, a
dropping funnel cover, a latex cap, a self-limiting device, a self-stopping device, an upper
dropping funnel, a lower
dropping funnel, a pressurizing ball, a lower flexible
pipe, a flow adjuster, a liquid
medicine filter and an intravenous infusion needle, wherein the self-limiting device consists of the air plug, the air filtering membrane and an exhaust channel on the dropping funnel cover; the self-stopping device arranged inside the dropping funnel comprises a limiting shaft sleeve which is embedded into an opening section at the upper end of an inner cavity of the lower dropping funnel, and a liquid-stopping valve; the liquid-stopping valve consists of a floating cover, a floating shaft and a soft suction cup; the floating shaft is tightly matched with an inner sleeve of the floating cover through the centre of the limiting shaft sleeve; the upper part of the soft suction cup is embedded inside a concave part at the bottom of the floating shaft and limited by the limiting shaft sleeve; the floating cover and the soft suction cup are connected through the floating shaft and move up and down in the inner cavities of the upper dropping funnel and the lower dropping funnel. The transfusion
system can quickly
discharge liquid automatically, control the liquid level height inside the dropping funnel, and automatically
discharge air in the dropping funnel after the
bottle plug puncture unit is inserted into a large transfusion bottle plug; the liquid-stopping valve can automatically seal the pipeline to prevent the air from entering inside the lower flexible
pipe to lead to blood return when no liquid
medicine is in a
medicine bottle or a little liquid medicine is in the dripping funnel in an infusion process.