ANORDNING VID ENVEGSFORSLUTNING FOR LUFTTOMMA ROR

摘要

Stopper for an evacuated tube with an open end for collecting fluid such as blood samples. The stopper includes a plug adapted to be mounted in the opening in the tube so as to normally seal the tube. The plug permits access of a fluid sample needle therethrough into fluid communication with the reduced pressure interior of the tube so that fluid is collected in the tube from the needle. A check valve is on the plug to automatically open when the needle is inserted through the plug and subjected to the reduced pressure in the tube and to automatically close when subjected to a predetermined amount of pressure from within the tube such as that caused by backflow thereby preventing any fluid passing into the needle from the tube. The check valve includes a chamber which can be used as a reagent holder prior to the tube use.