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The viscometric thermometer a nonperturbing instrument for measuring temperature in tissues under electro magnetic radiation


, : The viscometric thermometer a nonperturbing instrument for measuring temperature in tissues under electro magnetic radiation. Journal of Bioengineering 1(5-6): 547-554

A new, non-perturbing technique for measuring the temperature of biological tissues under non-ionizing electromagnetic radiation was described. The technique was based on the measurement of the flow resistance of a fluid through a small capillary at the tip of the implantable probe. Under suitable conditions, the resistance is proportional to the viscosity, a temperature-dependent property, of the fluid in the capillary. Because of the low flow rate used, the capillary is in thermal equilibrium with the surrounding tissue. Prototype probes of diameters in the range 1.2-2 mm and lengths of about 50 mm were constructed and tested. The potential advantages of the viscometric thermometer were: it is thermally and mechanically rugged and can withstand temperature extremes without damage or need for recalibration (it is autoclavable); the electrical and thermal properties of the probe body material and the working fluid were chosen to match closely those of the tissue, thus minimizing or eliminating any perturbations of the electromagnetic and temperature fields in the tissue. In contrast, this matching of properties is not possible with electrical or optical techniques. Its simplicity should lead to greater reliability and possibly disposability of the probes.

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