| abstract |
A resiliently flexible bag has a chamber with inlet and outlet passageways, the outlet passageway being connectible to a tube and the inlet passageway having perforable closure means. The chamber is normally filled with a liquid, such as a saline solution. A cannula is mounted upon a container for insertion through the closure member and communication between the chamber in the bag and the interior of the container. If the container holds a liquid, intermittent, manual compressing and releasing of the flexible bag causes the liquid within the bag to move into the container or the liquid in the container to move into the bag, depending upon their relative vertical positions. A special cannula and container therefor are provided to furnish filtered air to the bag prior to connection thereof with the container if such air is needed. |