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One or more waste balancing systems may be used in a fluid circulating system for medical use. The fluid circulating system may be part of a blood treatment system for a patient suffering renal failure. A waste balancing system may include a pressure element operable to maintain a constant fluid pre

One or more waste balancing systems may be used in a fluid circulating system for medical use. The fluid circulating system may be part of a blood treatment system for a patient suffering renal failure. A waste balancing system may include a pressure element operable to maintain a constant fluid pressure created by the combined weight of waste removed from a patient and replacement fluid for providing to a patient. Multiple evaluation characteristics or control parameters may be evaluated or controlled for safety and accuracy. At least part of the waste balancing system may be incorporated into a disposable cartridge.

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1. A waste-balancing system for an extracorporeal blood system, the waste-balancing system comprising: a blood treatment machine with a fluid circuit having at least one blood treatment component configured to receive and cleanse blood of uremic toxins, further configured to receive a treatment flui

1. A waste-balancing system for an extracorporeal blood system, the waste-balancing system comprising: a blood treatment machine with a fluid circuit having at least one blood treatment component configured to receive and cleanse blood of uremic toxins, further configured to receive a treatment fluid consumed in the process of cleansing the blood and to produce a waste fluid, a blood treatment performed by said blood treatment machine requiring a predetermined ratio between the rate of flow of the treatment fluid and the rate of flow of the waste fluid;a waste fluid line configured to receive waste fluid from the at least one blood treatment component;a treatment fluid line configured to convey treatment fluid to the at least one blood treatment component;a first pump module configured to pump waste fluid through the waste fluid line; anda second pump module configured to pump treatment fluid through the treatment fluid line,wherein the first and second pump modules have respective fluid forcing members that are mechanically coupled to form a single moving device, such that pumping by the first pump module of a quantity of waste fluid results in pumping by the second pump module of a proportional quantity of treatment fluid,the first pump module includes a first rotor, the second pump module includes a second rotor, and the first and second rotors are supported on a common shaft. 2. The waste-balancing system of claim 1, wherein fluid flowing in the waste fluid line is hermetically sealed from fluid flowing in the treatment fluid line. 3. The waste-balancing system of claim 1, wherein the first and second pump modules each includes a peristaltic pump. 4. The waste-balancing system of claim 1, further comprising a first sensor in the waste fluid line between the at least one blood treatment component and the first pump module, and a second sensor in the treatment fluid line between a treatment fluid source and the second pump module. 5. The waste-balancing system of claim 4, wherein the first and second sensors are pressure sensors. 6. The waste-balancing system of claim 1, further comprising a controller configured to control pumping rates of the first and second pump modules. 7. The waste-balancing system of claim 1, further comprising a controller, the controller being configured to control pumping rates of the first and second pump modules responsive to pressure head across the first and second pump modules. 8. The waste-balancing system of claim 7, wherein the controller controls the pumping rates of the first and second pump modules such that a flow rate fluid in the waste line is equal to a flow rate of fluid in the treatment fluid line. 9. The waste-balancing system of claim 1, wherein first and second pump modules are constructed such that a flow rate in the waste fluid line is equal to a flow rate in the treatment fluid line. 10. The waste-balancing system of claim 1, further comprising control valves connected to the waste fluid line and the treatment fluid line and configured to equalize pressure head across the first and second pump modules. 11. A waste-balancing system for an extracorporeal blood system, the waste-balancing system comprising: a blood treatment machine with a fluid circuit having at least one blood treatment component configured to receive and cleanse blood of uremic toxins, further configured to receive a treatment fluid consumed in the process of cleansing the blood and to produce a waste fluid, a blood treatment performed by said blood treatment machine requiring a predetermined ratio between the rate of flow of the treatment fluid and the rate of flow of the waste fluid;a waste fluid line configured to receive waste fluid from the at least one blood treatment component;a treatment fluid line configured to convey treatment fluid to the at least one blood treatment component;a first pump module configured to pump waste fluid through the waste fluid line; anda second pump module configured to pump treatment fluid through the treatment fluid line,wherein the first and second pump modules have respective fluid forcing members that are mechanically coupled to form a single moving device, such that pumping by the first pump module of a quantity of waste fluid results in pumping by the second pump module of a proportional quantity of treatment fluid, andthe first pump module and the second pump module are driven by a common drive system. 12. A waste-balancing system for use in performing an extracorporeal blood treatment on a patient, the waste-balancing system comprising: a pumping device having first and second pumping portions, the first pumping portion configured to pump waste fluid through a waste fluid line, the second pumping portion configured to pump treatment fluid through a treatment fluid line,the first pumping portion being physically coupled to the second pumping portion; anda controller configured to control pump speeds of the pumping device responsively to measured pressures in the waste fluid line and the treatment fluid line in order to maintain the rates of pumping of the first and second pumping portions to correspond to a predicted ratio of proportionality between the flow rate of waste and a flow rate of the treatment fluid,wherein the first and second pumping portions are driven by a common drive shaft. 13. The waste-balancing system of claim 12, further comprising a first sensor configured to measure pressure in the waste fluid line and a second sensor configured to measure pressure in the treatment fluid line. 14. The waste-balancing system of claim 13, wherein the first and second sensors are arranged upstream from the pumping device in the waste fluid and treatment fluid lines, respectively. 15. The waste-balancing system of claim 12, wherein the controller controls pump speeds of the pump module such that the flow rate through the waste fluid line is equal to the flow rate through the treatment fluid line. 16. The waste-balancing system of claim 12, wherein the pump module is configured such that fluid flowing in the waste fluid line is hermetically sealed from fluid flowing in the treatment fluid line. 17. The waste-balancing system of claim 12, wherein the controller is configured to control pump speeds of the pumping device to keep measured pressures in the waste fluid and treatment fluid lines within a predetermined range. 18. The waste-balancing system of claim 12, wherein the controller is configured to halt the extracorporeal blood treatment when the measured pressures are outside of a predetermined range.