The utility model relates to a return blood displaying positive pressure closing indwelling needle. The device comprises a venous indwelling tube, a sealing plug, a connecting pipe and a soft elastic membrane and positive pressure switch, soft pipe liquid flow to the downstream end of the soft tube indwelling needle is connected, even flow of liquid to the upstream end is connected with a positive pressure switch, the elastic membrane is installed in the pressure switch, pressure switch is open in the relaxation of elastic membrane the positive pressure state, the switch is closed, the elastic membrane oppressed plugging pipeline, the soft even effective extrusion pipeline within the liquid, improve the venipuncture blood return indication function is more sensitive and have closed flow function of the liquid in the pipe extrusion on blood anti indwelling needle at.
【技术实现步骤摘要】
【技术保护点】
一种回血显示正压关闭留置针，包括静脉留置管、密封塞、软连管、弹性膜和正压开关，软连管液体流向的下游端连接留置针，软连管液体流向的上游端连接正压开关，弹性膜安装在正压开关内，正压开关打开时弹性膜处于松弛状态，正压开关关闭时弹性膜被压迫封堵管路。
【技术特征摘要】
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