Selective chemical sensitive FET transducers

Surgery – Truss – Perineal

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1951035R, 195127, 204195M, 204195P, 204195S, 204195B, 324 29, 357 25, A61B 505, G01N 2746, G01N 3114

Patent

active

040208303

ABSTRACT:
A chemical sensitive field-effect transistor transducer capable of selectively detecting and measuring chemical properties of substances to which the transducer is exposed. The transducer includes a semiconductor substrate material having a certain doping polarity, a pair of spaced apart diffusion regions located at the surface of the substrate material and having a doping polarity opposite that of the substrate material, electrical insulator material overlying the diffusion regions and the surface of the substrate material lying between the diffusion regions, and a chemical selective system overlying the insulator material. The chemical selective system is adapted to interact with certain substances and thereby modulate an electric field produced in the substrate material between the diffusion regions. This modulation is dependent upon the chemical properties of the substances and provides a measure of those chemical properties. The chemical selective system may include various structures for measuring ion activity, immunochemical concentrations, reducible gas concentrations and the concentrations of enzymes and substrates.

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P. Bergveld, IEEE Trans. on Bio-Med. Eng., pp. 70-71, Jan. 1970.
Tadayuki Matsuo et al., IEEE Trans. on Bio-Med. Eng., pp. 485-487, Nov. 1974.
Piet Bergveld, IEEE Trans. on Bio-Med. Eng., vol. BME-19, No. 5, pp. 342-351, Sept. 1972.
Gary R. Rechnitz, C & EN, pp. 29-35, Jan. 27, 1975.

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