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Electronic clinical thermometer, and method of measuring body temperature
| Details |
Inventors: Ishizaka, Hideo; Hanzawa, Yoshiki;
Assignee: Terumo Corporation (Tokyo, JP)
Primary Examiner: Gruber; Felix D.
Assistant Examiner:
Attorney, Agent or Firm: Frishauf, Holtz, Goodman & Woodward
An electronic clinical thermometer successively stores the temperature detected at a portion of a body, and measures the time which has elapsed since start of measurement. The thermometer repeats, periodically, a process of obtaining and displaying a predicted value of a stable temperature from the detected temperature and elapsed measurement time on the basis of a stable temperature prediction function in which measurement time is a variable, the temperature prediction function defining a temperature change up to a final, stable temperature. The prediction computation is halted when, after the elapsed measurement time has exceeded a prescribed magnitude and a difference exhibited by the detected temperature corresponding to two successive points in time no longer shows an increase outside a prescribed range, the detected temperature corresponding to a present point in time exhibits a decrease outside a prescribed range when compared with the detected temperature at the preceding point in time. |
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DETAILED DESCRIPTION The object of the present invention is to provide an electronic clinical thermometer, as well as a method of measuring body temperature, in which computations for predicting a final, stabilized temperature having a high degree of reliability can be performed at a precision in line with the purpose of the measurement, namely at a precision decided by the volition of the user.
According to the present invention, the foregoing objects are attained by providing an electronic clinical thermometer comprising temperature detecting means for detecting temperature at a part of a body and for generating a first signal indicative of the detected temperature, storage means for sequentially storing the first signal, elapsed time measuring means for measuring time which has elapsed since start of measurement and for generating a second signal indicative of the measured elapsed time, arithmetic means for obtaining a predicted value of a stable temperature from the first and second signals on the basis of a stable temperature prediction function in which measurement time is a variable, the function defining a temperature change up to final, stable temperature, first control means in response to which a computation for predicting stable temperature is performed periodically by the arithmetic means display means for displaying the predicted value of stable temperature, and second control means responsive to the elapsed time measuring means for reading the first signal, corresponding to two successive points in time, out of the storage means and comparing the two signals.
After the second control means finds that the second signal has exceeded a first prescribed elapsed time and that a difference exhibited by the first signal corresponding to two successive points in time no longer shows an increase outside a first prescribed range, the first signal corresponding to a present point in time is compared with the first signal at the preceding point in time and, when the first-mentioned first signal exhibits a decrease outside a second prescribed range, the second control means halts the operation of the arithmetic means
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