IMPROVED CHECK VALVE FLAP FOR FLUID INJECTOR

摘要

A backflow-prevention system that substantially prevents contaminant backflow at a treatment site. The system in-cludes a fluid ejector tube for insertion into the patient's mouth and a backflow prevention device that receives fluid from the fluid ejector tube. The backflow prevention device includes an internally positioned valve member. The valve member limits contami-nant backflow. The valve member is movable between open and closed positions based on a vacuum pressure condition in the sys-tem.