Patent ID: 6019899
Filing Date: 2000-02-01
Classification: A61J,B01D

Abstract:
A device for storing and dispensing a sterile liquid comprising:i) a first hollow storage container for storing said liquid;ii) a housing mounted on said hollow storage chamber comprising an inlet for communicating with said hollow storage chamber and an outlet, a liquid-sterilizing filter mounted in said housing between said inlet and said outlet on a filter holder;wherein said housing comprises a lower threaded housing for securing to said hollow storage container and an upper filter assembly mounted for spring-biased reciprocal motion on said lower threaded housing;iii) said filter holder comprising outlet apertures and a central return passageway;iv) a first central chamber in said lower threaded housing communicating with said inlet and with said outlet apertures on said filter holder;v) a central bore in said lower threaded housing having areas of increased diameter adjacent the lower end thereof;vi) piston means on said upper filter assembly sealingly slidable within said first central chamber for increasing and reducing pressure in the interior of said first central chamber, whereby said liquid is drawn into said first central chamber from said hollow storage container when pressure is reduced therein and when pressure is increased in the interior of said first central chamber liquid held in said first central chamber is forced out said outlet apertures, said piston means having a hollow central chamber and a hollow central post, the hollow center of which communicates with said passageway in said filter holder, said central post having O-ring means adjacent the lower end thereof for sealing engagement with said central bore, and an aperture above said O-ring means communicating with said hollow center; andvii) check valve means associated with said inlet adapted to permit said liquid to flow into said first central chamber from said storage container when the pressure in said first central chamber is reduced, and prevent the flow of said liquid from said first central chamber into said storage container when the pressure in said intermediate chamber is increased.