There is provided a leukocyte filter comprising: a prefilter portion; and a membrane filter portion downstream of the prefilter portion, the membrane filter portion having a pore size distribution having a median pore size between 3 and 12 microns and having at least 40% of the pore volume being constituted...http://www.google.fr/patents/US6629613?utm_source=gb-gplus-shareBrevet US6629613 - Leukocyte filter
