Abstract: A filter container for separating cells includes a tubular filter member-housing part having an opening at each longitudinal end, a liquid inlet port on a first opening end side of the filter member-housing part, a liquid outlet port on a second opening end side of the filter member-housing part, a first filter-pressing part on the first opening end side, and a second filter-pressing part on the second opening end side. The first filter-pressing part includes three or more first protrusions, and the ratio of an area of a polygon formed by individually connecting the tips of the three or more first protrusions to a cross-sectional area of an inner space of the filter member-housing part at the first protrusion position is controlled within a preset range.

Abstract: Crosslinked polymer particles that are useful as an adsorbent, or carrier thereof, for treatment of a liquid containing physiological substance and/or cells, etc., such as body fluid, and that is reduced in the activation of complement system and leukocytes; and a process for producing polymer particles being useful as an adsorbent/treating material, or carrier thereof, for treatment of body fluid. In particular, there are provided crosslinked polymer particles comprising as a constituent a polymerization unit containing a vinyl alcohol unit and nitrogen-containing polymerization unit, wherein the content of nitrogen base on the whole weight of grains in the dry state as determined by elementary analysis is in the range of 7.0 to 13.0 weight %, and wherein the surface nitrogen content determined by X-ray photoelectron spectroscopy (XPS) is in the range of 5.0 to 15.0 at %.

Abstract: An object of the present invention is to provide a method of modifying a blood contact material capable of reducing granulocyte activating action of the blood contact material in medical equipment used for parts which get contact with the blood. The present invention provides a method of modifying blood contact material characterized by granulocyte activating action when in contact with blood,the modifying blood contact material is considerably reduced compared with an original blood contact material by immobilizing a tryptophan derivative and a polyanionic compound to the blood contact material. Examples of the tryptophan derivative include tryptophan. Further, examples of the polyanionic compound include dextran sulfate.