FIELD: medicine. SUBSTANCE: filter for filtering spinal fluid comprises at least one membrane layer having pore size from 0.04 to 0.45 mcm, thickness from 0.1 to 1 mm, geometric surface area from 15 to 300 sq.cm and separating capacity for pyrogenic matter of at least 500 mcg. EFFECT: improved efficiency in filtering spinal fluid. 15 cl, 4 dwg
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