Femoral venous and femoral arterial cannulas and a method for mitigating the risk of limb ischemia

A femoral arterial cannula comprising:

• an elongated hollow cannula body having distal and proximal open ends;
• a balloon situated on said body adjacent said distal end;
• inflation means connected to said balloon for inflating said balloon;
• four blood flow exit ports situated in said cannula body between said balloon and said distal end, two of said distal exit ports in-line with one-another along said cannula body and two other distal exit ports being 180° circumferentially offset from the first two distal exit ports;
• and
• two blood flow exit ports situated in said cannula body between said balloon and said proximal end, said proximal exit ports being 180° circumferentially offset and longitudinally offset from one-another.

A femoral venous cannula comprising:

• an elongated hollow cannula body having distal and proximal open ends;
• a balloon situated on said body adjacent said proximal end;
• inflation means connected to said balloon for inflating said balloon;
• two blood flow entry ports situated in said cannula body between said balloon and said distal end, said distal entry ports being 180° circumferentially offset and longitudinally offset from one-another along said cannula body;
• and
• two blood flow entry ports situated in said cannula body between said balloon and said proximal end, said proximal entry ports being 180° circumferentially offset and longitudinally offset from one-another and 90° offset from said distal entry ports.