B - Operations – Transporting – 67 – D
Patent
B - Operations, Transporting
67
D
B67D 7/76 (2010.01) A61J 1/14 (2006.01) B01D 19/00 (2006.01) B01D 61/18 (2006.01) B01D 61/20 (2006.01) B01D 65/10 (2006.01) B67D 5/58 (2006.01)
Patent
CA 2102589
Currently microfiltration devices use hydrophilic membranes to sterilize liquids. Air locks may develop on the upstream side of the filter membrane within these apparatus. The present invention provides a method and apparatus for removing an air lock from the upstream side of a microfilter in a device for dispensing a sterile liquid from a storage container by forcing the liquid through a microfilter. The device comprises a first inlet passsageway communicating between the storage container and a chamber on the upstream side of the filter closable by a first valve, a second outlet passageway communicating between the storage container and the chamber on the upstream side of the filter closable by a second valve, and the method comprises the steps of: a) creat- ing a partial vacuum in the chamber upstream of the microfilt- er to thereby open the first valve and draw the liquid from the storage container through the first passageway into the chamber and into contact with the upstream side of the filter; b) closing the first and second valves and increasing the air pressure in the upstream chamber; and c) opening the second valve thereby releasing air under pressure from the upstream chamber through the second passageway.
Oyen Wiggs Green & Mutala Llp
Webb Garth T.
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