A vascular occlusion catheter for at least partial occlusion of a target vessel having an internal vessel wall, the vascular occlusion catheter system comprising: a proximal outer shaft ; a distal outer shaft distally terminating with an atraumatic tip ; an occlusion balloon connected to the proximal outer shaft at a proximal neck and the distal outer shaft at a distal neck ; the proximal outer shaft having a first internal lumen and a second internal lumen , the first internal lumen being in fluid communication with the occlusion balloon ; the distal outer shaft having a distal internal lumen ; a hypotube having an internal hypotube lumen , the hypotube extending through the first internal lumen , through the occlusion balloon and into communication with the distal internal lumen , the hypotube operating as the primary load-bearing chassis of the vascular occlusion catheter ; a first window formed in the proximal outer shaft ; a proximal sensor being positioned within the second internal lumen facing the first window ; a second window formed in distal outer shaft ; a distal sensor being positioned within the distal internal lumen facing the second window ; and a display hub positioned along the proximal outer shaft , wherein the second internal lumen and the hypotube extend into the display hub , the display hub being electrically connected with the proximal sensor via the second internal lumen , and the display hub being electrically connected with the distal sensor via the internal hypotube lumen and the distal internal lumen ; wherein the occlusion balloon , the proximal outer shaft and the distal outer shaft have a greatest outer diameter of 2.3 mm (seven French (7 Fr)) or less in an uninflated condition. a proximal outer shaft ; a distal outer shaft distally terminating with an atraumatic tip ; an occlusion balloon connected to the proximal outer shaft at a proximal neck and the distal outer shaft at a distal neck ; the proximal outer shaft having a first internal lumen and a second internal lumen , the first internal lumen being in fluid communication with the occlusion balloon ; the distal outer shaft having a distal internal lumen ; a hypotube having an internal hypotube lumen , the hypotube extending through the first internal lumen , through the occlusion balloon and into communication with the distal internal lumen , the hypotube operating as the primary load-bearing chassis of the vascular occlusion catheter ; a first window formed in the proximal outer shaft ; a proximal sensor being positioned within the second internal lumen facing the first window ; a second window formed in distal outer shaft ; a distal sensor being positioned within the distal internal lumen facing the second window ; and a display hub positioned along the proximal outer shaft , wherein the second internal lumen and the hypotube extend into the display hub , the display hub being electrically connected with the proximal sensor via the second internal lumen , and the display hub being electrically connected with the distal sensor via the internal hypotube lumen and the distal internal lumen ; wherein the occlusion balloon , the proximal outer shaft and the distal outer shaft have a greatest outer diameter of 2.3 mm (seven French (7 Fr)) or less in an uninflated condition. <EOS>