Development of a new method for the noninvasive measurement of deep body temperature without a heater.

The conventional zero-heat-flow thermometer, which measures the deep body temperature from the skin surface, is widely used at present. However, this thermometer requires considerable electricity to power the electric heater that compensates for heat loss from the probe; thus, AC power is indispensable for its use. Therefore, this conventional thermometer is inconvenient for unconstrained monitoring. We have developed a new dual-heat-flux method that can measure the deep body temperature from the skin surface without a heater. Our method is convenient for unconstrained and long-term measurement because the instrument is driven by a battery and its design promotes energy conservation. Its probe consists of dual-heat-flow channels with different thermal resistances, and each heat-flow-channel has a pair of IC sensors attached on its top and bottom. The average deep body temperature measurements taken using both the dual-heat-flux and then the zero-heat-flow thermometers from the foreheads of 17 healthy subjects were 37.08 degrees C and 37.02 degrees C, respectively. In addition, the correlation coefficient between the values obtained by the 2 methods was 0.970 (p<0.001). These results show that our method can be used for monitoring the deep body temperature as accurately as the conventional method, and it overcomes the disadvantage of the necessity of AC power supply.

[1]  J D HARDY,et al.  Measurement of some thermal properties of human tissues. , 1954, Journal of applied physiology.

[2]  Dae Joong Kim,et al.  Dermofat Graft in Deep Nasolabial Fold and Facial Rhytidectomy , 2003, Aesthetic Plastic Surgery.

[3]  C. T. Wallace,et al.  Perforation of the tympanic membrane, a complication of tympanic thermometry during anesthesia. , 1974, Anesthesiology.

[4]  Christina D Chambers,et al.  Risks of hyperthermia associated with hot tub or spa use by pregnant women. , 2006, Birth defects research. Part A, Clinical and molecular teratology.

[5]  Ivan Ochsenius Robinson,et al.  Predicting the efficacy of convection warming in anaesthetized children. , 2009, British journal of anaesthesia.

[6]  M. Schaller,et al.  Pathogenetic and prognostic significance of altered coagulation and fibrinolysis in acute lung injury/acute respiratory distress syndrome , 2006 .

[7]  T. Togawa,et al.  Improved probe for a deep body thermometer , 2006, Medical and Biological Engineering and Computing.

[8]  Losowsky Ms,et al.  A clinical apraisal of transcutaneous deep body temperature. , 1973 .

[9]  Fox Rh,et al.  A new technique for monitoring the deep body temperature in man from the intact skin surface. , 1971, The Journal of physiology.

[10]  T. Rowland,et al.  Determinants of endurance exercise capacity in the heat in prepubertal boys. , 2007, International journal of sports medicine.

[11]  R. Vale.  Monitoring of Temperature During Anesthesia , 1981, International anesthesiology clinics.

[12]  T. Tsuji,et al.  Patient monitoring during and after open heart surgery by an improved deep body thermometer. , 1987, Medical progress through technology.

[13]  Tatsuo Togawa,et al.  Deep temperature monitoring in intensive care , 1979 .

[14]  R H Fox,et al.  A new method for monitoring deep body temperature from the skin surface. , 1973, Clinical science.

[15]  Toshio Kobayashi,et al.  A modified internal temperature measurement device , 1976, Medical and biological engineering.

[16]  M. Tabor,et al.  Tympanic membrane perforation: complication of tympanic thermometry during general anesthesia. , 1981, Oral surgery, oral medicine, and oral pathology.