A Study of Body Temperature Measurement Using the Zero-Heat-Flow Technique

深层人体温度计是一种用于监测人体温度的仪器，在零热流量技术中已经被使用。它是福克斯在1971年发明的。由该项目的一个研究者（T.T.）改进。现在正在为操作性患者监测和许多其他应用程序提供信息。However。它的最高准确性并没有被充分研究过。该项目已计划对深层体温计的准确性进行调查。此外，还将对探测器设计进行修改。对准确性来说是关键的，深度身体温度计的探测器被修改了，因此，一个缓慢的积极反馈控制被引入来弥补错误，以防止从深度系统中热流到环境空气探测。该探测器的表现是通过1）数字分析进行的。2）模拟器实验。和3）在志愿者主题中的度量。作为结果。这是由数值分析和模拟器实验展示的，该实验表明，探针设计中的修改明显地减少了测量错误。本课题研究显示，经改良的探针和经测量的身体温度之间的平均差异在0.1 ° C的房间温度下残留在20 ° C和25 ° C的房间温度下。这证实了探测器设计中的修改可以准确地确定临床人体温度测量的最大要求。

The deep body thermometer is an instrument for body temperature monitoring in which zero-heat-flow technique is employed. It was invented by Fox in 1971. improved by one of the investigator of this project (T.T.). and now spreading for post operative patient monitoring and many other applications. However. its ultimate accuracy has not been well studied. The project was planned to investigate the accuracy of the deep body thermometer. and also to provide a modification of the probe design. which is critical to the accuracy.The probe of the deep body thermometer was modified so that a slight positive feedback control was introduced to compensate the error due to a heat flow from the deep tissue to the ambient air detouring the probe. The performance of the probe was examined by 1) numerical analysis. 2) simulator experiment. and 3) measurements in volunteer subjects.As the results. it was shown by the numerical analysis and the simulator experiment that the modification in the probe design significantly reduces the measurement error. The subject study showed that the averaged differences between measured body temperatures by the modified probe and a sublingual thermistor probe remained within 0.1゜C in a room temperature of 20゜C and 25゜C.From these results. it was confirmed that the modification in the probe design could realize accuracy which satisfies most demands of clinical body temperature measurements.