Medicinal liquid injection catheter

A method of injecting a medicinal liquid into a living being comprising:

• inserting a first guide wire into a first living being lumen;
• inserting a second guide wire into a second living being lumen branched from the first living being lumen;
• inserting a distal insertion end of a tubular main body into the first living being lumen along the first and second guide wires such that (i) the first guide wire is inserted in a first guide wire lumen provided in the tubular main body, and the second guide wire is inserted in a second guide wire lumen provided in the tubular main body, (ii) a distal end portion of the second guide wire projects through a side of the tubular main body at a second guide wire projection location, (iii) the second guide wire remains inserted in the second living being lumen, (iv) the first guide wire lumen and the second guide wire lumen are spaced apart from one another and disposed away from an axial center of the tubular main body, and (v) a first imaginary line extends between a center of the first guide wire lumen and a center of the second guide wire lumen when viewed in cross section;
• inserting a tubular member into a tubular member lumen, the center of the tubular member lumen being provided within a region of the tubular main body, when viewed in cross section, that is defined by second and third imaginary lines, the second imaginary line passing through the center of the first guide wire lumen and being perpendicular to the first imaginary line and the third imaginary line passing through the center of the second guide wire lumen and being perpendicular to the first imaginary line;
• projecting an end portion of the tubular member from the tubular main body into the living being through a side wall of the first living being lumen while the first guide wire is extended beyond the distal insertion end of the tubular main body by a substantial distance and the second guide wire is extended beyond the side of the tubular main body by a substantial distance, the tubular member projecting from a tubular member projection location that is located at an axial distance from the distal insertion end of the tubular main body, the axial distance between the distal insertion end of the tubular main body and the tubular member projection location is the same as or less than an axial distance between the distal insertion end of the tubular main body and the second guide wire projection location, wherein the end portion of the tubular member projects in a different direction from each of directions in which the first and second guide wires are respectively extended into the first and second living being lumens;
• and
• supplying the medicinal liquid into the living being through the tubular member while the first guide wire is extended beyond the distal insertion end of the tubular main body by a substantial distance and the second guide wire is extended beyond the side of the tubular main body by a substantial distance.