Patent ID: 8246566

Claim:
A system for administering a blood treatment therapy comprising: a substitution fluid pump; a filtrate pump; controller for managing fluid flow of a treatment using the substitution fluid pump and the filtrate pump, the controller including (i) a plurality of inputs, including an actual substitution fluid input, an actual filtration input, a prescribed substitution fluid input and a prescribed filtration input, (ii) a plurality of outputs, including a substitution fluid flow output, a filtration flow output, a high total fluid loss alarm output and a low total fluid loss alarm output, (iii) a differencing module configured to provide an actual flow difference signal calculated as the difference between the actual substitution fluid input and the actual filtration input, (iv) a comparator configured to compare the actual flow difference signal to: (a) the prescribed substitution fluid flow input, and (b) the prescribed filtration flow input to (c) produce a flow error signal, (iv) a total fluid loss module configured to calculate and store a total fluid loss value based upon the flow error signal, wherein the total fluid loss module outputs: (a) the high total fluid loss alarm signal if the total fluid loss value is above an upper threshold, (b) the low total fluid loss alarm signal if the total fluid loss value is below a lower threshold, and (c) an override signal if the total fluid loss value is within the upper and lower thresholds; and wherein the substitution fluid flow output and the filtration flow output are adjusted based at least in part upon the flow error signal and the override signal.