An apparatus for embolizing an artery in a living subject, the apparatus comprising: a catheter having a lumen that provides a fluid tight path between a distal end of the catheter and a proximal portion of the catheter ; a balloon disposed near the distal end of the catheter , wherein the balloon is configured to alternately (a) allow blood to flow through the artery outside the catheter when the balloon is in a deflated state or (b) prevent blood from flowing through the artery outside the catheter when the balloon is in an inflated state; a fluid tight chamber having an inflow port , an outflow port , and at least one port (126A-C) for receiving contrast agent and embolic beads, wherein the outflow port is fluidly coupled to the lumen at the proximal portion of the catheter ; a first valve configured to selectively open or close the inflow port ; a second valve configured to selectively open or close the outflow port ; at least one third valve (127A-C) configured to selectively open or close the at least one port (126A-C) for receiving contrast agent and embolic beads; and an introducer sheath configured to extract blood from the subject; wherein the first valve , the second valve , and the at least one third valve (127A-C) are configured to open and close in a sequence to (a) input embolic beads and a first quantity of contrast agent via the at least one port (126A-C) for receiving contrast agent and embolic beads, (b) inject a mixture that includes the embolic beads and the first quantity of contrast agent through the lumen via the outflow port , (c) input blood obtained using the introducer sheath via the inflow port , and (d) inject the blood obtained using the introducer sheath through the lumen via the outflow port ; and wherein the introducer sheath is configured to guide the catheter during introduction of the catheter . a catheter having a lumen that provides a fluid tight path between a distal end of the catheter and a proximal portion of the catheter ; a balloon disposed near the distal end of the catheter , wherein the balloon is configured to alternately (a) allow blood to flow through the artery outside the catheter when the balloon is in a deflated state or (b) prevent blood from flowing through the artery outside the catheter when the balloon is in an inflated state; a fluid tight chamber having an inflow port , an outflow port , and at least one port (126A-C) for receiving contrast agent and embolic beads, wherein the outflow port is fluidly coupled to the lumen at the proximal portion of the catheter ; a first valve configured to selectively open or close the inflow port ; a second valve configured to selectively open or close the outflow port ; at least one third valve (127A-C) configured to selectively open or close the at least one port (126A-C) for receiving contrast agent and embolic beads; and an introducer sheath configured to extract blood from the subject; wherein the first valve , the second valve , and the at least one third valve (127A-C) are configured to open and close in a sequence to (a) input embolic beads and a first quantity of contrast agent via the at least one port (126A-C) for receiving contrast agent and embolic beads, (b) inject a mixture that includes the embolic beads and the first quantity of contrast agent through the lumen via the outflow port , (c) input blood obtained using the introducer sheath via the inflow port , and (d) inject the blood obtained using the introducer sheath through the lumen via the outflow port ; and wherein the introducer sheath is configured to guide the catheter during introduction of the catheter . <EOS>