Touch free tympanic thermometer

• US 4,191,197 A
• Filed: 03/14/1978
• Issued: 03/04/1980
• Est. Priority Date: 03/14/1978
• Status: Expired due to Term

• Current Assignee: Theodor H. Benzinger
• Original Assignee: Theodor H. Benzinger
• Inventors: Benzinger, Theodor H.
• Primary Examiner(s): Woodiel, Donald O.
• Application Number:
  US05/886,705
• Time in Patent Office: 721 Days
• Field of Search: 73/349, 128/2 H, 128/736, 128/742
• US Class Current: 600/549
• CPC Class Codes: G01K 1/16 Special arrangements for conducting heat from the object to the sensitive element
• CPC Class Codes: G01K 13/20 Clinical contact thermometers for use with humans or animals

Abstract

A thermometer system for blowing heated air having a temperature value close to the temperature value of body temperature directly onto the tympanic membrane from tubing apparatus, and measuring the temperature of the air as it returns from the membrane, the air having membrane temperature.

Claims

1. Method for obtaining the temperature of the tympanic membrane comprising passing heated air of a temperature close to tympanic temperature onto a tympanic membrane, whence it returns with the temperature of that membrane, returning said air through a separated path from said heated air, measuring the temperature of the air in said separated path.

2. The method of claim 1 wherein the returned air is of the temperature of the membrane when the passing air is heated to membrane temperature.

3. The method of claim 1 wherein the step of measuring the difference of the temperature of the passing air and the returning air.

4. A touch-free tympanic thermometer comprising a tube passing heated air of a temperature close to tympanic temperature onto a tympanic membrane and from a thermoelectric probing tube, and means measuring the temperature of the air returning outside the tubing yet while inside the ear canal.

5. The invention of claim 4 wherein a pair of thermoelectric junctions or thermistors disposed within said flow path measure the difference in temperature between the ingoing and outgoing air.

6. The invention of claim 5 wherein the difference in temperature between the ingoing and outgoing air is maintained to be zero at all times by means of a servo-heater means activated by the difference in temperature measured in said flow path.

7. The invention of claim 6 wherein metalized outer and inner surfaces in said flow path serve as conductors of electricity from thermoelectric junctions at the inner and outer surfaces thereof.

8. The invention of claim 5 wherein a voltmeter with a commutation switch serves alternatively to read and adjust zero temperature difference between inside and outside of the tube, or the absolute temperature of the air returning through the ear canal, outside the tube.

9. The invention of claim 8 wherein the ear canal is occluded to force the air to exit through a tube surrounding concentrically the tubing through which the heated air enters into the ear canal.

10. The invention of claim 5 wherein the air leaves through recesses at the inside or outside of a fluted and/or tapered tubing, arranged concentrically around the air inlet tubing.

11. The invention of claim 4 wherein the thermoelectric probing tube separates easily from the ear plug, making the latter dispensible, yet tightly fitting therewith.

12. The invention of claim 4 wherein the thermoelectric probing tube is "semi-dispensible" by means of a six-pole disconnect switch means for electrical lead wires, and a disconnect between the tube and an air pump.

13. The invention of claim 12 wherein air is supplied to the thermoelectric probing tube from a small pump.

14. The invention of claim 13 wherein air is supplied to the thermoelectric probing tube from a compressed gas bottle storage.

15. The invention of claim 12 wherein the heater is a wire loop with its turning point near the distal end of the thermoelectric probing tube, whereas the two terminals emerge from the proximal end, and are included in the six-pole disconnect.

16. The invention of claim 4 wherein air is supplied to the thermoelectric probing tube from an empty bottle, through displacement with water by gravity.

17. The invention of claim 4 wherein thermistor means for temperature measuring means are used in lieu of the thermoelectric devices described.

18. The invention of claim 4 wherein a heating-wire loop is deployed in the air supply tube upstream from the sites of the temperature measurements.

19. The invention of claim 4 in which the terminals of the electric heater loop and the leadwires from the temperature and temperature-difference measuring devices exit jointly at the proximal end of the air tube.

20. The invention of claim 4 in which all six electric leadwires and the air tube terminate in a common quick disconnect for airflow and electric lines to be separated from the box containing readouts, amplifiers, power supply mini-air pump and other accessories.