BLOOD PROCESSING FILTER

PROBLEM TO BE SOLVED: To provide a flexible blood processing filter in which an exit side container is not in close contact with a filter element to prevent the flow of blood from being blocked and which is excellent in pressure resistance and peeling resistance. SOLUTION: The blood processing filter is composed of: a blood entrance side container on a flexible sheet 8, a blood exit side container 2'; and sheet-like filter elements 3 and 4 for removing microaggregates and leukocytes or the microaggregates, the leukocytes and thrombocytes from the blood. The sheet-like filter elements 3 and 4 are clamped by the respective containers and fixed to the respective containers at the peripheral edge part, and the inside is partitioned into an entrance side space and an exit side space. Between the sheet-like filter elements and the exit side container, a spacer, whose thickness is 0.5 to 5 mm, aperture ratio is 30 to 70% and total area including an aperture part is 10 to 90% by an area ratio to an effective filtration area, is not fixed to any of the filter elements and the respective containers at the peripheral edge part of the sheet-like filter elements. COPYRIGHT: (C)2008,JPO&INPIT