Balanced flow dialysis machine

摘要

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.

主权项

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 to 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 to 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 to the balancing system is equal to a pressure of the spent renal failure therapy fluid flowing to the balancing system.