Multi-lumen catheters are often limited to central locations as they need a larger diameter to contain the multiple lumens. In contrast, a traditional peripheral catheter has one lumen, so multiple are placed for simultaneous flow, and this increases risk for catheter-associated infections. The team has created a double lumen peripheral catheter which can simultaneously draw and return blood from a peripheral vein for the purpose of improving apheresis treatments. Apheresis involves collecting, removing, or replacing blood components per specific procedure. The device consists of a 3D printed catheter shaft with a cross section that reflects the appropriate lumen sizes for draw and return. The catheter is designed to insert into the arm’s basilic vein and simultaneously draw and return blood under the appropriate flow rates and pressures.