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.