Disclosed is an automatic cut-off drip chamber with a negative pressure conduction device, including an automatic cut-off drip chamber (1-1) and a negative pressure conduction device (1-2) a sealing arcuate latex film sheet (1-1-5) arranged in the automatic cut-off drip chamber (1-1) drops when the liquid drug is used up to block the flow of the drug liquid in the infusion tube, so that negative pressure is produced in the infusion tube and a negative pressure arcuate latex film sheet (1-2-4) arranged in the negative pressure conduction device (1-2) is made to indent, and gas flow or negative pressure is produced in a negative pressure cavity (1-2-3-4) where the negative pressure arcuate latex film sheet (1-2-4) is located, so that a signal is transmitted to an alarm-monitoring device. The drip chamber makes use of liquid properties and the principles of gravity, pressure and negative pressure, providing the disposable intravenous transfusion system drip chamber and combined device thereof with the functions of automatic cut-off and negative pressure conduction, thereby precluding the phenomenon of air intake and blood reflux due to the drug liquid level sharply decreasing in the infusion tube during intravenous infusion, while providing negative pressure support for an external monitoring system.La présente invention concerne une chambre de goutte à goutte à arrêt automatique avec dispositif de conduction à pression négative, comprenant une chambre de goutte à goutte à arrêt automatique (1-1) et un dispositif de conduction à pression négative (1-2) une pellicule détanchéité arquée en latex (1-1-5) disposée dans la chambre de goutte à goutte à arrêt automatique (1-1) se rabat lorsquil ny a plus de médicament liquide pour empêcher lécoulement de médicament liquide dans la tubulure de perfusion, de telle sorte quune pression négative est produite dans la tubulure de perfusion et une pellicule arquée en latex sous pression négative (1-2-4) disposée dans le dispositif
