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US 2019/0240390 A1Published application
Body Temperature Measurement Devices, Methods, and Systems
AssigneeNxStage Medical, Inc.
InventorsScott W. NEWELL, Dennis M. TREU, Jerome JAMES
Life of this patent
Estimating the term…
Abstract
A core temperature measurement may be made by varying the heat transfer dynamics of a blood circuit and fitting parameters of a blood circuit heat transfer configuration to measurements under the varied conditions. Then the input temperature of the patient core can be extracted from the model and a current temperature measurement remote from the patient core and optionally other measurements such as blood flow rate.
Claims14
A method of calculating a blood return temperature, comprising:
- pumping blood from a patient using an extracorporeal blood processing machine, the pumping including pumping blood at multiple flow rates;
- measuring blood temperatures, and recording them, in a blood circuit at a temperature sensor located remote from a patient access, connected by an arterial portion thereof, for each of said multiple flow rates;
- calculating a heat transfer characteristic of the blood circuit from the patient access to the temperature sensor responsively to the multiple flow rates and the respective temperatures;
- using the heat transfer characteristic, regulating a return temperature at a patient access end of a venous portion of said blood circuit that returns blood to said patient.
1 more element
A system for performing a blood treatment, comprising:
- a blood treatment machine adapted to receive a blood circuit and for pumping blood from a patient;
- a controller connected to the blood treatment machine, the controller being programmed to pump blood at multiple flow rates during a predetermined operating mode;
- during the predetermined operating mode, the controller measuring blood temperatures, and recording them, wherein the blood temperatures are measured in the blood circuit at a temperature sensor located remote from a patient access of said blood circuit, the patient access being connected by an arterial portion thereof to said temperature sensor, said blood temperatures being measured and recorded for each of said multiple flow rates;
- the controller calculating a heat transfer characteristic of the blood circuit from the patient access to the temperature sensor responsively to the multiple flow rates and the blood temperatures, respectively;
- the controller, responsively to the heat transfer characteristic, regulating a return temperature at a patient access end of a venous portion of said blood circuit that returns blood to said patient.
2 more elements
Dependencies are inferred from the claim text.