초록 ▼

During hemofiltration, blood is conveyed from an individual through a blood line into a hemofilter to remove waste fluid. Waste fluid is conveyed from the hemofilter through a waste removal line at a waste removal rate. Waste fluid pressure is sensed in the waste removal line. A controller adjusts t

During hemofiltration, blood is conveyed from an individual through a blood line into a hemofilter to remove waste fluid. Waste fluid is conveyed from the hemofilter through a waste removal line at a waste removal rate. Waste fluid pressure is sensed in the waste removal line. A controller adjusts the waste removal rate to maintain waste fluid pressure at a predetermined set value.

대표청구항 ▼

1. A hemofiltration system comprising an extracorporeal circuit for circulating blood from an individual through a hemofilter to remove waste, the extracorporeal circuit including a blood line coupled to the hemofilter and adapted to draw blood from the individual, a blood pump to convey blood throu

1. A hemofiltration system comprising an extracorporeal circuit for circulating blood from an individual through a hemofilter to remove waste, the extracorporeal circuit including a blood line coupled to the hemofilter and adapted to draw blood from the individual, a blood pump to convey blood through the blood line from the individual into the hemofilter at a blood flow rate, a waste removal line to convey waste fluid from the hemofilter, a sensor in the blood line to sense blood pressure, and a controller coupled to the sensor and the blood pump to adjust the blood flow rate to maintain blood pressure at a predetermined set value. 2. A system according to claim 1 wherein the controller generates an alarm output based upon variance between sensed blood pressure and the predetermined set value. 3. A system according to claim 2 wherein the alarm output terminates operation of the blood pump. 4. A method for carrying out hemofiltration comprising the steps of conveying blood from the individual at a blood flow rate through a blood line into a hemofilter to remove waste fluid, conveying waste fluid from the hemofilter through a waste removal line, sensing blood pressure in the blood line, and adjusting the blood flow rate to maintain blood pressure at a predetermined set value. 5. A method according to claim 4 further including the step of generating an alarm output based upon variance between sensed blood pressure and the predetermined set value. 6. A method according to claim 5 wherein the alarm output terminates operation of the blood pump. 7. A hemofiltration system, comprising: a filter; an arterial blood line connectable to a patient access and adapted to convey blood from said patient access to a filter; a venous blood line connectable to said patient access and adapted to convey blood from said filter to patient access; and a pump configured to convey blood through said arterial blood line, a sensor to sense pressure in said arterial blood line, and a controller connected to receive a pressure signal from said sensor and to control a rate of flow of said pump; said controller being configured to maintain a constant pressure in said arterial blood line by regulating a speed of said pump in response to said pressure signal. 8. A system as in claim 7, wherein said controller is configured to slow said rate of flow when said pressure drops. 9. A system as in claim 8, wherein said controller is configured to speed up said rate of flow when said pressure increases. 10. A system as in claim 7, wherein said controller is configured to control said rate of flow by controlling a speed of said pump. 11. A system as in claim 7, wherein said controller is a microcomputer programmed to compare said pressure signal with a predetermined value. 12. A system as in claim 7, wherein said controller is configured such that when said patient access becomes clogged, said rate of flow is slowed.