Device, system, and method for determining patient body temperature
AssigneeVital Connect, Inc.
InventorsNandakumar Selvaraj, Gabriel Nallathambi
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Abstract
A wireless wearable sensor device, method, and non-transitory computer readable medium for determining patient body temperature based on a skin temperature and sensor ambient air temperature is disclosed.
Claims15
A method to determine a patient's core body temperature continuously using a single biometric patch biosensor including a first sensor, a second sensor, and a reusable electronic module, wherein the reusable electronic module includes at least one processor, or a system-on-chip board, and wherein the first sensor and the second sensor are integrated in the single biometric patch biosensor that is attachable to the patient's skin, the method comprising:
- measuring, by the first sensor, a first temperature value at a skin surface on a patient body;
- measuring, by the second sensor, a second temperature value of ambient air surrounding the first sensor;
- passing the first temperature value through an adaptive filter by the electronic module to cancel ambient air temperature fluctuations from the first temperature value at the skin surface and produce an adaptive filter output,
- wherein the adaptive filter output is subtracted from the second temperature value to produce an error e, and
- wherein the error e is fed to the adaptive filter to update filter coefficients to minimize the error e;
- continuously determining, by the electronic module, a core body thermal exchange at the skin surface on the patient body by subtracting the adaptive filter output from the first temperature value;
- continuously determining, by the electronic module, the patient's core body temperature by using the core body thermal exchange;
- controlling, by the electronic module, an absolute amplitude level of the core body thermal exchange,
- wherein the controlling the absolute amplitude level of the core body thermal exchange includes subtracting an AC offset of the core body thermal exchange and adding a DC calibration value that transforms a time varying change of trend of the core body thermal exchange to an absolute scale, and wherein the core body thermal exchange includes at least one of:
- in a case of a first calibration, the AC offset is the value of the core body thermal exchange at a temperature sensor settling period, or
- in a case of a recalibration, the AC offset is the value of the core body thermal exchange at a time of a recalibration request;
- outputting, by the electronic module, the patient's core body temperature to a display screen, wherein the patient's core body temperature output is invalidated with a unique numerical code until a settling time flag (ts_flag) and a calibration flag (cal_flag) are onset or changed from 0 to 1;
- and
- displaying the patient's core body temperature on the display screen.
A wireless sensor device for continuous monitoring of a patient's core body temperature comprising a single biometric patch biosensor attachable to the patient's skin, including a reusable electronic module, and a display device, wherein the single biometric patch biosensor also includes an integrated first sensor and second sensor and wherein the reusable electronic module includes at least one processor, or a system-on-chip board, and wherein:
- the first sensor is configured to:
- measure a first temperature value at a skin surface on a patient body;
- the second sensor is configured to measure a second temperature value of ambient air surrounding the first sensor;
- wherein the electronic module receives the first and second temperature values and implements by the processor an application stored in a memory to:
- cancel, by an adaptive filter, ambient air temperature fluctuations from the first temperature value at the skin surface and producing an adaptive filter output,
- wherein the adaptive filter output is subtracted from the second temperature value to produce an error e, and
- wherein the error e is fed to the adaptive filter to update filter coefficients to minimize the error e;
- continuously determine a core body thermal exchange at the skin surface on the patient body by subtracting the adaptive filter output from the first temperature value,
- continuously determine a patient's core body temperature by using the core body thermal exchange,
- control an absolute amplitude level of the core body thermal exchange,
- wherein the controlling the absolute amplitude level of the core body thermal exchange includes subtracting an AC offset of the core body thermal exchange and adding a DC calibration value that transforms a time varying change of trend of the core body thermal exchange to an absolute scale, and
- wherein the core body thermal exchange includes at least one of:
- in a case of a first calibration, the AC offset is the value of the core body thermal exchange at a temperature sensor settling period, or
- in a case of a recalibration, the AC offset is the value of the core body thermal exchange at a time of a recalibration request, and
- output the patient's core body temperature, wherein the patient's core body temperature output is invalidated with a unique numerical code until a settling time flag (ts_flag) and a calibration flag (cal_flag) are onset or changed from 0 to 1;
- and
- the display device is configured to display the patient's core body temperature.
A non-transitory computer-readable medium storing executable instructions for determining a patient's core body temperature continuously that, in response to execution, cause a processor of a wireless sensor device using a single biometric patch biosensor, including a first sensor, a second sensor, and a reusable electronic module, wherein the reusable electronic module includes at least one processor, or a system-on-chip board, and wherein the first sensor and the second sensor are integrated in the single biometric patch biosensor that is attachable to the patient's skin, to perform operations comprising:
- measuring, by the first sensor, a first temperature value at a skin surface on a patient body;
- measuring, by the second sensor, a second temperature value of ambient air surrounding the first sensor;
- passing the first temperature value through an adaptive filter by the electronic module to cancel ambient air temperature fluctuations from the first temperature value at the skin surface and produce an adaptive filter output,
- wherein the adaptive filter output is subtracted from the second temperature value to produce an error e, and
- wherein the error e is fed to the adaptive filter to update filter coefficients to minimize the error e;
- continuously determining a core body thermal exchange at the skin surface on the patient body by subtracting the adaptive filter output from the first temperature value;
- continuously determining a patient's core body temperature by using the core body thermal exchange;
- controlling an absolute amplitude level of the core body thermal exchange,
- wherein the controlling the absolute amplitude level of the core body thermal exchange includes subtracting an AC offset of the core body thermal exchange and adding a DC calibration value that transforms a time varying change of trend of the core body thermal exchange to an absolute scale, and
- wherein the core body thermal exchange includes at least one of:
- in a case of a first calibration, the AC offset is the value of the core body thermal exchange at a temperature sensor settling period, or
- in a case of a recalibration, the AC offset is the value of the core body thermal exchange at a time of a recalibration request;
- outputting the patient's core body temperature to a display screen, wherein the patient's core body temperature output is invalidated with a unique numerical code until a settling time flag (ts_flag) and a calibration flag (cal_flag) are onset or changed from 0 to 1;
- and
- displaying the patient's core body temperature on the display screen.
Dependencies are inferred from the claim text.