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US 11,684,708 B2Granted
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 patient's body temperature measurement may be made by varying the heat transfer dynamics of a fluid exiting the patient's body and fitting parameters of 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 fluid flow rate.
Claims14
A method of detecting a core temperature of a patient involved in a treatment or diagnostic procedure, comprising:
- controlling, using an automatic controller, a rate of flow of fluid drawn from the patient through a fluid circuit, the fluid entering the fluid circuit at a fluid circuit entry at the core temperature, the fluid circuit having a temperature sensor located remote from the fluid circuit entry with an initial portion of the fluid circuit connecting the temperature sensor with the fluid circuit entry;
- the controlling establishing a first flow rate of the fluid from the patient to the temperature sensor thereby causing heat to be exchanged between the fluid circuit and fluid;
- at the first flow rate, measuring and recording a first at least one temperature using the temperature sensor;
- controlling, using the automatic controller, the flow of the fluid through the fluid circuit to establish a second flow rate, different from the first flow rate;
- repeating the measuring and recording, at the second flow rate, to record a second at least one temperature using the temperature sensor;
- calculating the core temperature using a combination of both the first and second at least one temperatures;
- and
- outputting a result of said calculating on a user interface.
5 more elements
A fluid temperature measurement method, comprising:
- providing a fluid pump and a temperature sensor, the fluid pump and temperature sensor being configured to receive a predefined fluid circuit;
- providing a controller connected to the fluid pump to control a speed thereof and to the temperature sensor to receive a temperature signal output therefrom;
- the temperature sensor being configured to detect a temperature of fluid carried by the fluid circuit;
- using the controller, operating the fluid pump at at least two flow rates;
- for each of the at least two flow rates, using the controller, recording first and second temperature data responsive to the temperature signal at each of said at least two flow rates;
- and
- using the controller, calculating an inlet temperature responsively to both the first and second temperature data and the at least two flow rates such that the inlet temperature is an estimation of the temperature at a point in said fluid circuit remote from the temperature sensor and the calculating compensates for a temperature change in flowing fluid between said point and said temperature sensor.
4 more elements
Dependencies are inferred from the claim text.