Blood-collecting device

摘要

A blood-collecting device comprises an outer cylinder (2), a gasket (3) slidable in the outer cylinder, and a plunger (4) for moving the gasket. A ventilatable filter member (35) is mounted on the end of a hole (32) formed in the gasket. The hole communicates with atmosphere via a hole (42) in the plunger and hollow interior (43) of the plunger. An anti-coagulation agent supply piece (5) with an anti-coagulation agent such as a heparin supported on one or both sides of a plate-like supporting member is provided in a space (26) defined by the outer cylinder (2) and the gasket (3). The tip (57) of the anti-coagulation agent supply piece has a shape tapered toward a blood inlet opening (23) of the cylinder, and the anti-coagulation agent supply piece maintains its posture by linear contact of a pair of sides (55,56) facing the inner surface (25) of the outer cylinder.