Circuit apparatus and method for electrothermal treatment of cancer eye

Abstract From the Canadian patent

Abstract of the Disclosure Circuitry for use in a hand-held electronic probe for passing high frequency current through malignant eye tissue of livestock or other tissue such as warts includes a thermistor in a probe tip that contacts the tissue producing a voltage, that controls a voltage controlled oscillator which drives an audio transducer. If, during treatment the probe tip is held, against the malignant tissue with sufficient force the pitch, of a sound emitted by the audio transducer steadily increases indicating to the user that proper pressure is being maintained to ensure heating of the tissue to the desired treatment temperature. The circuitry then causes the transducer to emit …