抄録
A thermoelectric recorder using a tiny thermistor bead heated by an electric current of suitable strength is described. When immersed in a flowing fluid, the recorder is very sensitive to flow changes, and the rate of response is much higher than that of usual recorder using a heated thermocouple. A needle-type element of this device having the thermistor bead on its tip is small enough to be inserted deep into the brain without any serious injury of the tissue. Its usefulness for measuring instantaneous changes of local blood flow in the brain tissue has been confirmed by several experiments.
