Surgery – Body protecting or restraining devices for patients or infants – Restrainers and immobilizers
Patent
1978-10-23
1980-12-23
Cohen, Lee S.
Surgery
Body protecting or restraining devices for patients or infants
Restrainers and immobilizers
219 1079, 336 66, A61N 140
Patent
active
042404452
ABSTRACT:
An apparatus and method for coupling electromagnetic energy into a dielectric material such as tissue while substantially reducing external leakage of the energy. The apparatus may also be used as a receiver for electromagnetic energy transmitted through tissue. The apparatus includes an open transmission line which is inherently non-radiating and may be configurated with a centrally disposed, central strip conductor. A ground plane conductor is placed in spaced relationship to the central strip conductor and on both sides of the central strip conductor. Alternatively, the central strip conductor may be placed in spaced relationship to one side of a ground plane conductor. The central strip conductor is terminated with a resistor of resistance equal to the characteristic impedance of the open transmission line. The spacing and electrical geometry of each of the central strip conductor, ground plane conductor, electrical interconnection points, and the resistor are each selectively predetermined to minimize spurious radiation during coupling of the transmission apparatus. The method includes minimizing external leakage of electromagnetic energy while coupling electromagnetic energy with tissue using the apparatus of this invention.
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Durney Carl H.
Iskander Magdy F.
Cohen Lee S.
University of Utah
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