| abstract |
There is disclosed a filter medium for selectively removing leucocytes, which is composed of fibers, each containing nonionic hydrophilic groups and nitrogen-containing basic functional groups at least in its peripheral surface portion. The present filter medium is useful for efficiently removing leucocytes while holding down the loss of platelets to a minimum and, therefore, the present filter medium can be effectively utilized in platelet transfusions and extracorporeal circulation leucocyte removal therapies and the like. |