System and method for monitoring body temperature of a person

• US 9,357,929 B2
• Filed: 07/27/2010
• Issued: 06/07/2016
• Est. Priority Date: 07/27/2010
• Status: Active Grant

• Current Assignee: Carefusion 303 Incorporated (Becton Dickinson & Co)
• Original Assignee: Carefusion 303 Incorporated (Becton Dickinson & Co)
• Inventors: Paquet, Pierre
• Primary Examiner(s): DOUGHERTY, SEAN PATRICK
• Application Number:
  US12/844,771
• Publication Number:
  US 20120029308A1
• Time in Patent Office: 2,142 Days
• Field of Search: 600/549, 600/301
• US Class Current: 1/1
• CPC Class Codes: A61B 2562/227 Sensors with electrical connectors
• CPC Class Codes: A61B 5/0022 Monitoring a patient using a global network, e.g. telephone networks, internet
• CPC Class Codes: A61B 5/01 Measuring temperature of body parts ; Diagnostic temperature sensing, e.g. for malignant or inflamed tissue clinical contact thermometers G01K13/20
• CPC Class Codes: A61B 5/02 Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
• CPC Class Codes: A61B 5/0816 Measuring devices for examining respiratory frequency measuring frequency of electric signals G01R23/00
• CPC Class Codes: A61B 5/14542 for measuring blood gases A61B5/14551 takes precedence
• CPC Class Codes: A61B 5/6823 Trunk, e.g., chest, back, abdomen, hip
• CPC Class Codes: A61B 5/6833 Adhesive patches
• CPC Class Codes: A61B 5/7221 Determining signal validity, reliability or quality A61B5/7207 and A61B5/7217 take precedence
• CPC Class Codes: A61B 5/7282 Event detection, e.g. detecting unique waveforms indicative of a medical condition A61B5/4094, A61B5/4818, A61B5/349, A61B5/0823 take precedence

Abstract

Systems and methods of monitoring body temperature of a person disclosed. A signal generated by a temperature probe is received, the signal responsive to a change in body temperature of a person to whom the temperature probe is attached. A new temperature reading is generated based on the signal. The new temperature reading is accepted or rejected based on the determination.

Claims

1. A method of monitoring body temperature of a person, the method comprising:

receiving, with a processor of a monitoring device affixed to the skin of a person, an electronic signal generated by a temperature probe of the monitoring device affixed to the skin of the person, the signal being responsive to a change in body temperature of the person to whom the temperature probe is attached;

generating, by the processor of the monitoring device, a new temperature reading based on the signal;

determining automatically, by the processor of the monitoring device, whether the new temperature reading satisfies a set of acceptance conditions, wherein the set of acceptance conditions comprises a first condition, a second condition, and a third condition, the first condition comprising completion of an initial stabilization in temperature readings by the monitoring device, the second condition comprising the new temperature reading being greater than a current maximum temperature reading, and the third condition comprising;

the new temperature reading being less than the current maximum temperature reading,

the new temperature reading being greater than or equal to a previous temperature reading, and

the new temperature reading having fallen from the current maximum temperature reading at a rate less than a threshold decay rate;

accepting or rejecting, by the processor of the monitoring device, the new temperature reading based on the determination, such that inaccurate temperature readings associated with poor thermal contact of the temperature probe with the skin of the person are rejected; and

wirelessly transmitting, by a wireless transceiver of the monitoring device, data indicative of the new temperature reading when the new temperature reading is accepted, wherein the completion of the initial stabilization in temperature readings is based on one of (i) a slope of a plurality of temperature readings versus time, or (ii) a predetermined period of time during which a plurality of temperature readings are made.

2. The method of claim 1, wherein the new temperature reading is accepted if at least one of the acceptance conditions is satisfied.

3. The method of claim 1, wherein the new temperature reading is rejected if all of the acceptance conditions are not satisfied.

4. The method of claim 1, wherein the new temperature reading is assigned to the current maximum temperature reading if at least one of the first, second, and third conditions is satisfied.

5. The method of claim 1, wherein the threshold decay rate is about 2 Celsius degrees per hour.

6. The method of claim 1, wherein the determining comprises generating a threshold decay curve based on the threshold decay rate and determining whether the new temperature reading is above the threshold decay curve.

7. The method of claim 1 further comprising providing an indication of the loss of the thermal contact if the third condition is not satisfied for a period longer than a predetermined maximum duration.

8. The method of claim 7 further comprising monitoring for a new completion of the initial stabilization in temperature readings after providing the indication of the loss of the thermal contact.

9. A medical temperature monitoring system comprising:

a temperature probe configured to be attached to a person and generate a signal responsive to a change in a temperature associated with the person to whom the temperature probe is attached;

an interface circuit coupled to the temperature probe and configured to generate a new temperature reading based on the signal;

a processor in data communication with the interface circuit and configured to;

determine whether the new temperature reading satisfies a set of acceptance conditions, wherein the set of acceptance conditions comprises a first condition, a second condition, and a third condition, the first condition comprising completion of an initial stabilization in temperature readings, and accept or reject the new temperature reading based on the determination, the second condition comprising the new temperature reading being greater than a current maximum temperature reading, and the third condition comprising;

the new temperature reading being less than the current maximum temperature reading,

the new temperature reading being greater than or equal to a previous temperature reading, and

the new temperature reading having fallen from the current maximum temperature reading at a rate less than a threshold decay rate; and

a wireless transceiver operatively coupled to the processor,

wherein the processor is configured to cause the wireless transceiver to wirelessly transmit data indicative of the new temperature reading when the new temperature reading is accepted to a server that is distinct from the medical temperature monitoring system, wherein the completion of the initial stabilization in temperature readings is based on one of (i) a slope of a plurality of temperature readings versus time, or (ii) a predetermined period of time during which a plurality of temperature readings are made.

10. The system of claim 9 further comprising a memory configured to store the set of acceptance conditions, wherein the processor is further configured to reject the new temperature reading if all of the acceptance conditions are not satisfied.

11. The system of claim 9, wherein the temperature probe comprises a sensing element configured for placement in an armpit of the person.

12. The system of claim 11, wherein the sensing element comprises a thermocouple.

13. The system of claim 11, wherein the sensing element comprises a thermistor.

14. The system of claim 11, wherein the interface circuit comprises an amplifier and an analog-to-digital converter.

15. The system of claim 9, wherein the interface circuit and the processor are part of a vital-sign monitor patch configured to be attached to the person'"'"'s body and to monitor one or more vital signs of the person other than the temperature.

16. The system of claim 15, wherein the one or more vital signs of the person comprise at least one of pulse rate, blood pressure, and respiratory rate of the person.

17. A non-transitory computer-readable medium having computer executable instructions stored thereon for execution by a processor to perform a method of measuring a temperature of a person, the method comprising the steps of:

receiving a signal generated by a temperature probe that is attached to a person, the signal responsive to a change in body temperature of a person to whom the temperature probe is attached;

generating a new temperature reading based on the signal;

determining automatically whether the new temperature reading satisfies a set of acceptance conditions, wherein the set of acceptance conditions comprises a first condition, a second condition, and a third condition, the first condition comprising completion of an initial stabilization in temperature readings by the monitoring device, the second condition comprising the new temperature reading being greater than a current maximum temperature reading, and the third condition comprising;

the new temperature reading being less than the current maximum temperature reading,

the new temperature reading being greater than or equal to a previous temperature reading, and

the new temperature reading having fallen from the current maximum temperature reading at a rate less than a threshold decay rate; and

wirelessly transmitting the new temperature reading when the new temperature reading satisfies the set of acceptance conditions, or rejecting the new temperature reading, based at least on the determination, such that inaccurate temperature readings associated with poor thermal contact of the temperature probe with the skin of the person are rejected,

wherein the completion of the initial stabilization in temperature readings is based on one of (i) a slope of a plurality of temperature readings versus time, or (ii) a predetermined period of time during which a plurality of temperature readings are made.