Thermal tympanic thermometer

• US 7,841,767 B2
• Filed: 08/08/2008
• Issued: 11/30/2010
• Est. Priority Date: 12/12/2002
• Status: Expired due to Term

• Current Assignee: Cardinal Health Ireland Unlimited Company (Cardinal Health, Inc.)
• Original Assignee: Covidien AG (Medtronic Plc)
• Inventors: Harr, James M.
• Primary Examiner(s): VERBITSKY, GAIL KAPLAN
• Application Number:
  US12/188,878
• Publication Number:
  US 20080298429A1
• Time in Patent Office: 844 Days
• Field of Search: 374/120, 374/121, 374/163, 374/183, 374/185, 374/135, 374/137, 374/141, 374/100, 374/170, 374/165, 374/158, 374/112, 374/208, 374/29, 374/30, 374/44, 374/133, 738/665
• US Class Current: 374/121
• CPC Class Codes: G01J 5/02 Constructional details
• CPC Class Codes: G01J 5/021 Probe covers for thermometers, e.g. tympanic thermometers; Containers for probe covers; Disposable probes
• CPC Class Codes: G01J 5/04 Casings
• CPC Class Codes: G01J 5/049 Casings for tympanic thermometers
• CPC Class Codes: G01J 5/06 Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity for adjusting of solid angle of collected radiation G01J5/07; means for wavelength selection G01J5/0801
• CPC Class Codes: G01J 5/061 by controlling the temperature of the apparatus or parts thereof, e.g. using cooling means or thermostats

Abstract

A tympanic thermometer includes a thermally conductive nozzle extending from a distal end of the thermometer. A base of a sensor can is thermally connected to the nozzle to define a path of conductive heat transfer from the nozzle to the base of the can thereby minimizing a thermal gradient between proximal and distal ends of the sensor can when temperature is measured in the ear. An air space around the sensor can inhibits heat transfer except at the base of the sensor can.

Claims

1. A tympanic thermometer having a proximal end and a distal end, the thermometer comprising:

a thermally conductive nozzle extending from the distal end of the thermometer,

a sensor can housing temperature sensing electronics for sensing temperature, the sensor can including a base thermally connected to the nozzle, the sensor can including a side wall facing toward an interior surface of the nozzle, the side wall being thermally isolated from the nozzle,

the nozzle defining an air space on a proximal side of the sensor can base and between the side wall of the sensor can and the interior wall of the nozzle to inhibit heat transfer from the sensor can, the base of the sensor can being secured directly to the nozzle.

2. A tympanic thermometer as set forth in claim 1 wherein the base of the sensor can is secured to an internal ridge of the nozzle.

3. A tympanic thermometer as set forth in claim 2 wherein the base of the sensor can is secured to the nozzle using a thermally-conductive adhesive.

4. A tympanic thermometer as set forth in claim 3 wherein a distal surface of the base of the sensor can is secured to the internal ridge of the nozzle and an opposite proximal surface of the base is free from contact with any structure.

5. A tympanic thermometer as set forth in claim 1 in combination with a probe cover thermally connected to the nozzle as part of a path of conductive heat transfer, wherein heat from outside the thermometer is transferred from the probe cover through the nozzle to the base of the sensor can via the path of conductive heat transfer.

8. A tympanic thermometer as set forth in claim 1 wherein the nozzle and sensor can are constructed and arranged to define a heat transfer path from the nozzle to the sensor can and to inhibit heat transfer away from the sensor can thereby minimizing a thermal gradient between proximal and distal ends of the sensor can when temperature is measured in the ear.

6. A tympanic thermometer having a proximal end and a distal end, the thermometer comprising:

a thermally conductive nozzle extending from the distal end of the thermometer,

a sensor can housing temperature sensing electronics for sensing temperature, the sensor can including a base thermally connected to the nozzle, the sensor can including a side wall facing toward an interior surface of the nozzle, the side wall being thermally isolated from the nozzle,

the nozzle defining an air space on a proximal side of the sensor can base and between the side wall of the sensor can and the interior wall of the nozzle to inhibit heat transfer from the sensor can,

in combination with a probe cover thermally connected to the nozzle as part of a path of conductive heat transfer, wherein heat from outside the thermometer is transferred from the probe cover through the nozzle to the base of the sensor can via the path of conductive heat transfer, wherein the probe cover is thermally connected to the nozzle solely at a distal end margin of the nozzle.

7. A tympanic thermometer having a proximal end and a distal end, the thermometer comprising:

a thermally conductive nozzle extending from the distal end of the thermometer,

a sensor can housing temperature sensing electronics for sensing temperature, the sensor can including a base thermally connected to the nozzle and directly connected to the nozzle only at the base, the sensor can including a side wall facing toward an interior surface of the nozzle, the side wall being thermally isolated from the nozzle,

the nozzle defining an air space on a proximal side of the sensor can base and between the side wall of the sensor can and the interior wall of the nozzle to inhibit heat transfer from the sensor can, wherein the thermometer is free of structure in thermal connection with the sensor can other than the nozzle.

9. A tympanic thermometer having a proximal end and a distal end, the thermometer comprising:

a thermally conductive nozzle extending from the distal end of the thermometer,

a sensor can housing temperature sensing electronics for sensing temperature, the sensor can including a base thermally connected to the nozzle and directly connected to the nozzle only at the base, the sensor can including a side wall facing toward an interior surface of the nozzle, the side wall being thermally isolated from the nozzle,

the nozzle defining an air space on a proximal side of the sensor can base and between the side wall of the sensor can and the interior wall of the nozzle to inhibit heat transfer from the sensor can, wherein the nozzle is made of metal and the sensor can is free of thermal connection with a metallic object other than the nozzle.