Device for storing and dispensing sterile liquids

A device for storing and dispensing a sterile liquid comprising a first hollow chamber for receiving said liquid and having a first outlet, a housing mounted on said first outlet having a second outlet and a passage communicating between said first and second outlets, and first valve means for alternately opening and closing said second outlet, characterized by

• a) a liquid-sterilizing filter mounted in said housing across said passage between said first and second outlets through which filter said liquid passes prior to being forced out said second outlet;
• b) an intermediate chamber in said housing between said first and second outlets, second valve means between said first chamber and said intermediate chamber adapted to permit said liquid to flow into said intermediate chamber from said first chamber, and prevent the flow of said liquid from said intermediate chamber into said first chamber when the pressure in said intermediate chamber is increased;
• c) pump means for increasing and reducing pressure in the interior of said intermediate chamber, whereby said liquid flows into said intermediate chamber from said first chamber and when pressure is increased in the interior of said intermediate chamber said first valve means is moved to an open position and liquid held in said intermediate chamber is forced through said filter and out said second outlet;
• and
• d) an aperture in said housing provided with means adapted to admit air from atmosphere into said first chamber and prevent the exit of liquid.