Non-contact thermometer sensing a carotid artery

• US 8,948,850 B2
• Filed: 05/08/2013
• Issued: 02/03/2015
• Est. Priority Date: 09/21/2012
• Status: Expired due to Fees

• Current Assignee: ARC Devices, Ltd.
• Original Assignee: Arc Devices (Ni) Limited
• Inventors: Roth, Jason
• Primary Examiner(s): KISH, JAMES M
• Application Number:
  US13/889,553
• Publication Number:
  US 20140088435A1
• Time in Patent Office: 636 Days
• Field of Search: 600/407, 600473-477, 600309-310
• US Class Current: 600/473
• CPC Class Codes: A61B 2560/0252 using ambient temperature
• CPC Class Codes: A61B 2562/0233 Special features of optical sensors or probes classified in A61B5/00
• CPC Class Codes: A61B 2562/0271 Thermal or temperature sensors
• CPC Class Codes: A61B 5/0059 using light, e.g. diagnosis by transillumination, diascopy, fluorescence A61B5/0093, A61B5/1455, A61B5/02416 and A61B5/0261 take precedence
• CPC Class Codes: A61B 5/0064 Body surface scanning
• CPC Class Codes: A61B 5/0075 by spectroscopy, i.e. measuring spectra, e.g. Raman spectroscopy, infrared absorption spectroscopy A61B5/0071 takes precedence
• CPC Class Codes: A61B 5/0086 using infrared radiation
• 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 5/015 By temperature mapping of body part
• CPC Class Codes: A61B 5/6817 Ear canal
• CPC Class Codes: A61B 5/6887 mounted on external non-worn devices, e.g. non-medical devices
• CPC Class Codes: A61B 5/7275 Determining trends in physiological measurement data; Predicting development of a medical condition based on physiological measurements, e.g. determining a risk factor
• CPC Class Codes: G01J 5/0025 Living bodies ear thermometers G01J5/0011; detecting, measuring or recording for diagnostic purposes A61B5/00
• CPC Class Codes: G01J 5/025 Interfacing a pyrometer to an external device or network; User interface
• CPC Class Codes: G01J 5/0808 Convex mirrors

Abstract

Methods and apparatus are provided which in some implementations a non-contact thermometer determines a temperature of a subject from a carotid source point of the subject.

Claims

1. An apparatus to determine a body temperature from a carotid artery source point, the apparatus comprising:

a housing;

a non-contact electromagnetic sensor operably mounted to the housing, the non-contact electromagnetic sensor being operable to receive electromagnetic energy from the carotid artery source point of a subject and operable to generate a numerical representation of the electromagnetic energy of the carotid artery source point;

a printed circuit board mounted in the housing, electrically coupled to the non-contact electromagnetic sensor and operable to determine the body temperature of the subject from the numerical representation of the electromagnetic energy of the carotid artery source point,

wherein determining the body temperature of the subject further comprises;

calculating the body temperature as f_stb(T_{surface temp}+f_ntc(T_ntc))+F4_body,

where f_stb is a representation of a surface of the body,

where T_{surface temp} is the numerical representation of the electromagnetic energy of the carotid source point,

where f_ntc is mathematical formula of an ambient temperature reading,

where T_ntc is the ambient air temperature reading,

where F4_body is the representation of the calibration difference,

f_ntc(T_ntc) is the bias in consideration of the temperature sensing mode; and

a button operably coupled to the printed circuit board.

2. The apparatus of claim 1, wherein the carotid artery source point further comprises:

not more than one carotid artery source point.

3. The apparatus of claim 1, wherein the bias further comprises:

+0.5°

C.

4. The apparatus of claim 1, wherein the body temperature of the subject further comprises:

a core temperature of the subject.

5. The apparatus of claim 1, wherein the body temperature of the subject further comprises:

an axillary temperature of the subject.

6. The apparatus of claim 1, wherein the body temperature of the subject further comprises:

a rectal temperature of the subject.

7. The apparatus of claim 1, wherein the body temperature of the subject further comprises:

an oral temperature of the subject.

8. The apparatus of claim 1, wherein the printed circuit board further comprises:

a microprocessor.

9. The apparatus of claim 1, wherein the body temperature of the subject further comprises:

a core temperature of the subject, an axillary temperature of the subject, a rectal temperature of the subject and an oral temperature of the subject.

10. An apparatus to measure a body temperature, the apparatus comprising:

a housing;

a non-contact sensor operably mounted to the housing, the non-contact sensor having an electromagnetic sensor, the electromagnetic sensor being operable to;

receive electromagnetic energy from a plurality of body source points of a subject including a carotid source point of the subject; and

generate a numerical representation of the electromagnetic energy of each of the plurality of body source points;

a printed circuit board mounted in the housing and operable to determine the body temperature of the subject from the numerical representation of the electromagnetic energy of each of the plurality of body source points, wherein determining the body temperature of the subject further comprises;

calculating the body temperature, yielding a calculated body temperature of each of the plurality of source points; and

averaging the calculated body temperature of each of the plurality of source points, yielding the body temperature,

wherein calculating the body temperature further comprises;

calculating the body temperature as f_stb(T_{surface temp}+f_ntc(T_ntc))+F4_body,

where f_stb is a representation of a surface of the body,

where T_{surface temp} is the numerical representation of the electromagnetic energy of the carotid source point,

where f_ntc is mathematical formula of an ambient temperature reading,

where T_ntc is the ambient air temperature reading,

where F4_body is the representation of the calibration difference,

f_ntc(T_ntc) is the bias in consideration of the temperature sensing mode; and

a display device operably coupled to the printed circuit board and operable to display the body temperature.

11. The apparatus of claim 10, wherein the plurality of body source points further comprises:

not more than two body source points.

12. The apparatus of claim 11, wherein the two body source points further comprise:

the carotid source point; and

a forehead source point.

13. The apparatus of claim 10, wherein the plurality of body source points further comprises:

the carotid source point; and

a forehead source point.

14. The apparatus of claim 10, wherein the printed circuit board further comprises:

a microprocessor.

15. The apparatus of claim 10, wherein the electromagnetic sensor further comprises:

an infrared temperature sensor.

16. The apparatus of claim 10, wherein the temperature of the subject further comprises:

the temperature of the subject selected from a group of temperatures of the subject consisting of a core temperature of the subject, an axillary temperature of the subject, a rectal temperature of the subject and an oral temperature of the subject.

17. A method to measure body temperature, the method comprising:

sensing electromagnetic energy at a plurality of external source points on a subject, yielding a sensed electromagnetic energy of the plurality of external source points;

determining the body temperature of the subject from the sensed electromagnetic energy of the plurality of external source points including a carotid source point, the determining being performed by a microprocessor, wherein determining the body temperature of the subject further comprises;

calculating the body temperature as f_stb(T_{surface temp}+f_ntc(T_ntc))+F4_body,

where f_stb is a representation of a surface of the body,

where T_{surface temp} is the numerical representation of the electromagnetic energy of the carotid source point,

where f_ntc is mathematical formula of an ambient temperature reading,

where T_ntc is the ambient air temperature reading,

where F4_body is the representation of the calibration difference,

f_ntc(T_ntc) is the bias in consideration of the temperature sensing mode; and

averaging the body temperature of each of the plurality of external source points, yielding the body temperature.

18. The method of claim 17, wherein the temperature of the subject consists of:

a core temperature of the subject, an axillary temperature of the subject, a rectal temperature of the subject and an oral temperature of the subject.

19. The method of claim 17, wherein the sensing further comprises:

sensing the electromagnetic energy at the carotid source point on the subject and a forehead source point on the subject, yielding the sensed electromagnetic energy of the plurality of external source points.