Catheter Assembly Including a Multi-Lumen Configuration

A method of making a catheter assembly, comprising:

• forming an elongate catheter tube including:
• an outer surface with opposing flat sides,
• a first lumen with a first cross-sectional circular shape and a first cross-sectional area,
• a second lumen with a second cross-sectional circular shape and a second cross-sectional area substantially equivalent to the first cross-sectional circular shape and the first cross-sectional area, and
• a third lumen with a third cross-sectional circular shape and a third cross-sectional area, wherein the third cross-sectional area is smaller than the first cross-sectional area and the second cross-sectional area, the third lumen axially offset from a central axis of the elongate catheter tube and adjacent to a first side of the opposing flat sides, the third lumen formed to withstand pressures associated with power injection of a fluid therethrough;
• joining a nose portion to a distal end of the elongate catheter tube, the nose portion including:
• a venous lateral opening in fluid communication with the first lumen;
• an arterial lateral opening in fluid communication with the second lumen;
• and
• a distal end opening in fluid communication with the third lumen, wherein the distal end opening is distal of the venous lateral opening and the arterial lateral opening;
• and
• coupling a trifurcating hub to a proximal end of the elongate catheter tube to provide fluid communication between:
• a venous extension leg and the first lumen,
• an arterial extension leg and the second lumen, and
• a power extension leg and the third lumen.