Treatment fluid multi-stream blood warmer
AssigneeNxStage Medical, Inc.
InventorDennis M. Treu
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Abstract
The disclosed subject matter relates to extracorporeal blood processing or other processing of fluids. A blood treatment system treats blood with multiple fluids and performs fluid balancing on a patient's blood compartment. Multiple streams influence the patient temperature but only a subset of the fluids are dynamically temperature regulated. The system regulates a temperature of the flow, for example, of dialysate in order to regulate the return temperature of blood, in such a way that the temperature effect of the multiple streams is compensated.
Claims6
A method of regulating blood return temperature in an extracorporeal blood treatment, comprising:
- actively regulating a fluid temperature regulator power output, using feedback control based on a blood return temperature signal, to control a temperature of a subset of multiple medicament streams that flow into, or contact, flowing blood;
- detecting a change in a flow rate or temperature of any one of the multiple medicament streams;
- and
- resetting a rate of the fluid temperature regulator power output using feedforward control responsively to said detecting.
Dependencies are inferred from the claim text.