Blood treatment filter, blood circuit, and blood treatment method

A blood treatment filter that treats blood introduced from an inlet and discharges the blood from an outlet, the blood treatment filter comprising:

• a filter container that introduces the blood from the inlet into an internal space, and discharges the treated blood from the outlet;
• a filter material that is housed in the filter container to partition the internal space into an inlet side space and an outlet side space, and filters the passing blood to remove a specific component;
• an inlet port that forms a blood introduction passage through which the blood flowing from the inlet to the internal space passes;
• and
• an outlet port that forms a blood lead-out passage through which the blood flowing from the internal space to the outlet passes;
• wherein the outlet port has an outlet anterior chamber communicating with the internal space, an outlet connection channel communicating with the outlet and having an outlet tapered portion with first and second ends, and a draw-in opening communicating between the outlet anterior chamber and the outlet connection channel,
• the outlet anterior chamber has a floor surface completely surrounding an outer periphery of the draw-in opening, wherein the floor surface is oriented in a plane that is perpendicular to a longitudinal plane in which the filter material is oriented,
• the outlet anterior chamber further comprising:
• a pair of side surfaces facing each other, a dome-shaped surface provided opposite the floor surface, and an end surface spaced apart from the draw-in opening, wherein the dome-shaped surface and the end surface intersect each other in a continuous arc,
• the draw-in opening is located at the first end of the outlet tapered portion, the outlet tapered portion having an inner surface with an inner diameter that widens from the first end towards the second end of the outlet tapered portion,
• wherein an acute-angled cross section is formed by an intersection of the floor surface of the outlet anterior chamber and the inner surface of the outlet tapered portion when viewed with respect to all cross-sections taken along an imaginary surface including a central axis in a channel direction of the outlet tapered portion, and
• wherein the floor surface and the inner surface of the outlet tapered portion, which intersect to form the acute-angled cross section, are configured to enable blood entering the outlet port to form a liquid-tight state within the outlet tapered portion.