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An extracorporeal blood processing method using a blood circuit comprising a pair of blood passages attached to opposite flow ends of a blood treatment device and said blood circuit is mounted on a blood pump console, the method includes: withdrawing blood from a vascular system of a human patient a

An extracorporeal blood processing method using a blood circuit comprising a pair of blood passages attached to opposite flow ends of a blood treatment device and said blood circuit is mounted on a blood pump console, the method includes: withdrawing blood from a vascular system of a human patient and drawing the blood into the blood circuit; pumping the withdrawn blood through one of the pair of blood passages using a first blood pump of the console and into the blood treatment device; pumping the treated blood from the treatment device through the other of the pair of blood passages using a second blood pump of the console; infusing the treated blood from the other blood passage and into the vascular system of the patient, and periodically reversing a flow direction of blood through the pair of blood passages and blood treatment device.

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1. An extracorporeal blood processing method using a blood circuit comprising a pair of blood passages attached to opposite flow ends of a blood treatment device and said blood circuit is mounted on a blood pump console, said method comprising: withdrawing blood from a vascular system of a human pat

1. An extracorporeal blood processing method using a blood circuit comprising a pair of blood passages attached to opposite flow ends of a blood treatment device and said blood circuit is mounted on a blood pump console, said method comprising: withdrawing blood from a vascular system of a human patient and drawing the blood into the blood circuit;pumping the withdrawn blood through one blood passage of the pair of blood passages and into the blood treatment device using a first blood pump coupled to the one blood passage and mounted to the console;pumping the treated blood from the treatment device through the other blood passage of the pair of blood passages using a second blood pump coupled to the other blood passage and mounted to the console;infusing the treated blood from the other blood passage and into the vascular system of the patient;withdrawing fluid from the withdrawn blood as the blood passes through the blood treatment device, wherein the rate of fluid withdrawal is determined by a filtrate pump coupled to a filtrate passage and mounted to the console;periodically reversing a flow direction of blood through the pair of blood passages and blood treatment device; andstopping the withdrawal of fluid from the withdrawn blood while the flow direction is reversed by stopping the filtrate pump. 2. The extracorporeal blood processing method in claim 1 wherein the blood treatment device is a blood filter. 3. The extracorporeal blood processing method in claim 1 wherein the pair of blood passages are similar in length. 4. The extracorporeal blood processing method in claim 1 wherein the blood treatment device is an ultrafiltration blood filter. 5. The extracorporeal blood processing method in claim 1 wherein a pump controller of said console cyclically switches the first and second blood pumps to reverse the blood flow direction after a volume of blood pumped through one of said pair of blood passages is in a range of 50 ml to 200 ml. 6. The extracorporeal blood processing method in claim 1 wherein the pair of blood passages each include a tube connectable to a catheter. 7. The extracorporeal blood processing method in claim 1 wherein the pair of blood passages each include a tube connectable to an implanted blood access device. 8. The extracorporeal blood processing method in claim 1 wherein said blood treatment device further comprises a filter having a filtrate output tube and said filtrate pump is connectable to the filtrate output tube. 9. The extracorporeal blood processing method in claim 1 wherein said controller operates the blood pumps to move blood through the circuit at a flow rate in a range of five milliliters per minute (ml/min) to fifteen ml/min. 10. The extracorporeal blood processing method in claim 1 wherein the circuit comprises an air in blood detection device coupled to each of the pair of blood passages, and said method further comprises monitoring for air in the blood flow through the pair of blood passages and stopping the blood flow in the circuit if air is detected in the blood flow. 11. The extracorporeal blood processing method in claim 1 wherein a rate of pumping the withdrawn blood is initially selected by human operator and thereafter is automatically adjusted by a controller of the pump console. 12. The extracorporeal blood processing method in claim 1 wherein the flow direction is cyclically reversed. 13. The extracorporeal blood processing method in claim 1 wherein the flow direction is reversed in a response to an abnormal pressure detected in the blood passage. 14. The extracorporeal blood processing method in claim 1 wherein the flow direction is reversed when a blood volume through the circuit is in a range of 50 ml to 200 ml. 15. The extracorporeal blood processing method in claim 1 further comprising adding an anticoagulant to the withdrawn blood upstream of the treatment device during both flow directions. 16. The extracorporeal blood processing method in claim 1 further comprising adding an anticoagulant to the withdrawn blood upstream of the blood treatment device during both flow directions, wherein a pair of one-way valves are connected to the blood passages and on opposite sides of the blood treatment device to allow the anticoagulant to enter only the blood passage which has the lowest pressure. 17. The extracorporeal blood processing method in claim 1 further comprising adding an anticoagulant to the withdrawn blood upstream of the treatment device during both flow directions, wherein a pair of one-way valves connected to the blood passages and on opposite sides of the blood treatment device allow the anticoagulant to enter the blood passages upstream of the blood treatment device. 18. The extracorporeal blood processing method in claim 17 wherein the one-way valves prevent anticoagulant flowing in one of the blood passages downstream of the blood treatment device. 19. The extracorporeal blood processing method of claim 17 wherein the one-way valves operate automatically. 20. The extracorporeal blood processing method of claim 17 wherein the one-way valves are actuated by a pressure in the blood passages. 21. The extracorporeal blood processing method of claim 17 wherein the one-way valves are actuated to an open position by a relative positive pressure in one of the blood passages and to a closed position by a relative negative pressure in the other blood passage. 22. The extracorporeal blood processing method of claim 1 further comprising detecting a leak in the blood passages by monitoring the blood passages for air entrained in the blood flow. 23. The extracorporeal blood processing method of claim 22 wherein the flow direction is reversed before a volume of the treated blood infused into the patient exceeds a predetermined volume in a range of 50 ml to 200 ml.