Transformable dual lumen cannula into a single lumen cannula and methods of use

A cannula configured to transform between a dual lumen cannula into a single lumen cannula, or configured to transform between the single lumen cannula into the dual lumen cannula, in a patient's vascular system in real time, in vivo, the cannula comprising:

• at least one inner lumen having at least two ends, an inner lumen proximal end and an inner lumen distal end, a hollow intermediate extent between said at least two ends having one or more openings at the inner lumen distal end, and at least one inner lumen connector unit and
• at least one flow router at the inner lumen proximal end, wherein said at least one inner lumen is configured to be inserted into an at least one outer lumen;
• said at least one outer lumen having at least two outer ends, an outer lumen proximal end and an outer lumen distal end, a hollow outer intermediate extent between said at least two outer ends having one or more openings, said hollow outer intermediate extent further comprising one or more openings at the outer lumen distal end, and at least one outer lumen connector unit at the outer lumen proximal end, wherein said outer lumen is configured to receive the at least one inner lumen;
• at least one single flow connector adapted to be connected to said at least one outer lumen connector unit at the outer lumen proximal end having a single channel flow pattern;
• and
• at least one dual flow connector adapted to be connected to said at least one inner lumen connector unit at the inner lumen proximal end having a dual channel flow pattern;
• wherein upon use as the single lumen cannula, said at least one outer lumen is configured to be in coupling contact with said at least one single flow connector when said at least one outer lumen has been installed in a patient;
• wherein upon use as the dual lumen cannula, said at least one inner lumen is configured to be inserted into said at least one outer lumen in vivo until said inner lumen proximal end of said at least one inner lumen connector unit is in coupling contact with said at least one outer lumen connector unit, and a proximal end of said at least one inner lumen connector unit is configured to be in coupling contact with said at least one dual flow connector after said at least one outer lumen has been installed in the patient.