THREE-WAY STOPCOCK, AND LIQUID TRANSFUSION CIRCUIT OR BLOOD TRANSFUSION CIRCUIT EITHER USING THE THREE-WAY STOPCOCK

摘要

A three-way stopcock, comprising: a substantially cylindrical shaped body having three branch openings on a periphery thereof; and a flow passage switching portion that is mounted to the body so as to be rotatable with respect to the body and to have liquid-tightness, and has three flow passage openings that form fluid flow passages so as to allow communication between predetermined branch openings out of the respective three branch openings, wherein the fluid flow passages can be changed by rotating the flow passage switching portion with respect to the body, wherein out of the branch openings, a first branch opening and a second branch opening are formed on a straight line, and a third branch opening is arranged in a direction perpendicular to the straight line connecting the first branch opening and the second branch opening, and the flow passage switching portion is provided with a first flow passage opening and a second flow passage opening that are formed on a straight line and a third flow passage opening arranged in a direction perpendicular to the straight line connecting the first flow passage opening and the second flow passage opening, and is provided with two fluid flow passages, each connecting the first flow passage opening to the third flow passage opening and the third flow passage opening to the second flow passage opening, the two fluid flow passages being formed so as to allow communication with each other in the vicinity of the third flow passage opening. IMAGE