BALANCED FLOW DIALYSIS MACHINE
First Claim
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1. A renal therapy system comprising:
- a dialyzer;
a balancing system configured to equalize flow volume of renal failure therapy fluid flowing to the dialyzer and from the dialyzer, the balancing system including a fresh renal therapy fluid portion and a spent renal therapy fluid portion;
a fresh renal therapy fluid pressure sensor positioned and arranged to detect a pressure of fresh renal failure therapy fluid delivered from the fresh renal therapy fluid portion of the balancing system;
a spent renal therapy fluid pressure sensor positioned and arranged to detect a pressure of spent renal failure therapy fluid delivered from the spent renal therapy fluid portion of the balancing system; and
a controller configured to (i) receive signals from the fresh and spent renal therapy fluid pressure sensors indicative of the detected pressures of the fresh and spent renal failure therapy fluids, respectively, and (ii) use the signals to control the fresh renal therapy fluid and the spent renal therapy fluid for the balancing system so that a pressure of the fresh renal failure therapy fluid flowing from the balancing system is equal to a pressure of the spent renal failure therapy fluid flowing from the balancing system.
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Abstract
A system and method for balancing flows of renal replacement fluid is disclosed. The method uses pressure controls and pressure sensing devices to more precisely meter and balance the flow of fresh dialysate and spent dialysate. The balancing system may use one or two balancing devices, such as a balance tube, a tortuous path, or a balance chamber.
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Citations
20 Claims
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1. A renal therapy system comprising:
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a dialyzer; a balancing system configured to equalize flow volume of renal failure therapy fluid flowing to the dialyzer and from the dialyzer, the balancing system including a fresh renal therapy fluid portion and a spent renal therapy fluid portion; a fresh renal therapy fluid pressure sensor positioned and arranged to detect a pressure of fresh renal failure therapy fluid delivered from the fresh renal therapy fluid portion of the balancing system; a spent renal therapy fluid pressure sensor positioned and arranged to detect a pressure of spent renal failure therapy fluid delivered from the spent renal therapy fluid portion of the balancing system; and a controller configured to (i) receive signals from the fresh and spent renal therapy fluid pressure sensors indicative of the detected pressures of the fresh and spent renal failure therapy fluids, respectively, and (ii) use the signals to control the fresh renal therapy fluid and the spent renal therapy fluid for the balancing system so that a pressure of the fresh renal failure therapy fluid flowing from the balancing system is equal to a pressure of the spent renal failure therapy fluid flowing from the balancing system. - View Dependent Claims (2, 3, 4, 5)
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6. A renal therapy system comprising:
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a dialyzer; first and second balancing devices configured to equalize flow volume of renal failure therapy fluid flowing to the dialyzer and from the dialyzer; a controller configured to equalize a fresh renal therapy fluid pressure on a fresh fluid side of the first and second balancing devices and equalize a spent renal therapy fluid pressure on a spent fluid side of the first and second balancing devices. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A renal therapy method comprising:
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providing first and second balancing devices that equalize flow volume of renal failure therapy fluid to a dialyzer and from the dialyzer; detecting a pressure of fresh renal failure therapy fluid delivered to or from the first and second balancing devices; detecting a pressure of spent renal failure therapy fluid delivered to or from the first and second balancing devices; and electronically controlling the flow of fresh renal therapy fluid and the flow of spent renal therapy fluid to equalize a fresh renal therapy fluid pressure on a fresh fluid side of the first and second balancing devices and equalize a spent renal therapy fluid pressure on a spent fluid side of the first and second balancing devices. - View Dependent Claims (17, 18, 19, 20)
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Specification