Device for localized heating of biological tissues
First Claim
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1. A device for localized heating of biological tissues comprising:
- electromechanical transducer means for projecting ultrasonic radiation, coupled to an electric excitation generator having a predetermined oscillation frequency, said transducer means being of the half-wave type and comprising a rigid plate of piezoelectric material, a first face of said plate being provided with a set of concentric annular groves of uniform pitch in the vicinity of the wavelength of said radiation in water, a second face of said plate being smooth and flat,said plate having annular radiating zones bounded by said grooves and provided with electrodes placed in contact with said faces, each annular radiating zone describing a circle to obtain a circular radiation pattern; and
an electric excitation generator having a predetermined oscillation frequency, said generator including an array of adjustable phase-shifting means for supplying said electrodes at least partially with voltages having adjustable phases for selectively focusing said radiation into biological tissues which are acoustically coupled with said second face, said selective focusing including moving said radiation pattern in a direction orthogonal to said plate.
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Abstract
A device for therapeutic heating by hyperthermia comprises an emitter which focuses ultrasonic radiation into biological tissues and produces localized heating, especially for the treatment of tumors. The radiation emitter consists of a piezoelectric plate subdivided into annular radiating zones of equal width by a set of concentric circular grooves.
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Citations
27 Claims
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1. A device for localized heating of biological tissues comprising:
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electromechanical transducer means for projecting ultrasonic radiation, coupled to an electric excitation generator having a predetermined oscillation frequency, said transducer means being of the half-wave type and comprising a rigid plate of piezoelectric material, a first face of said plate being provided with a set of concentric annular groves of uniform pitch in the vicinity of the wavelength of said radiation in water, a second face of said plate being smooth and flat, said plate having annular radiating zones bounded by said grooves and provided with electrodes placed in contact with said faces, each annular radiating zone describing a circle to obtain a circular radiation pattern; and an electric excitation generator having a predetermined oscillation frequency, said generator including an array of adjustable phase-shifting means for supplying said electrodes at least partially with voltages having adjustable phases for selectively focusing said radiation into biological tissues which are acoustically coupled with said second face, said selective focusing including moving said radiation pattern in a direction orthogonal to said plate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification