Catheter with a side port and methods for use thereof

A catheter comprising:

• a first tubular structure defining a first lumen, the first tubular structure having a first end and a second end, wherein the first end of the first tubular structure comprises a first opening, and wherein the second end of the first tubular structure comprises a second opening;
• a second tubular structure defining a second lumen, the second tubular structure having a first end and a second end, wherein the second end of the second tubular structure comprises a third opening;
• and
• a fourth opening positioned in a sidewall of the second tubular structure between the first end of the second tubular structure and the second end of the second tubular structure, wherein a first portion of the first tubular structure extends beyond the first end of the second tubular structure to the first opening, wherein a second portion of the first tubular structure extends from a proximal end of the first portion of the first tubular structure to the second opening, wherein the second portion of the first tubular structure is positioned adjacent to the second tubular structure, wherein the second tubular structure tapers from distal to the fourth opening to the proximal end of the first portion of the first tubular structure, and wherein a diameter of an entirety of the first tubular structure is less than a diameter of the second tubular structure.