Surgery – Body protecting or restraining devices for patients or infants – Restrainers and immobilizers
Patent
1985-06-26
1987-10-27
Cohen, Lee S.
Surgery
Body protecting or restraining devices for patients or infants
Restrainers and immobilizers
219 1055R, A61N 140
Patent
active
047022620
ABSTRACT:
An electromagnetic applicator (10) is provided for heating internal biological tissue, such as cancerous tumors, where applicators generate an electromagnetic field propagating across a gap (20) for forming a relative maximum power density adjacent the internal tumor volume. Conductive elements (12, 14) are spaced a predetermined distance to form a gap (20) and power is applied at radio frequencies through a balancing and matching circuit to generate the electromagnetic field which propagates across the gap (20). A plurality of applicators (10) may be placed about a body location to enable the maximum relative power density to be placed at a selected location within the body portion. A radiating dipole antenna (46) may be used to radiate a signal from which transmitted signal parameters are derived for forming a local power density maximum at a location approximated by the radiating dipole antenna (46). A controller (42) provides power source (40) outputs to applicators (10) having the same relative amplitudes and opposite phase angles of signals received from the transmitting dipole antenna (46) at locations approximating the locations of applicators (10) at the desired body location.
REFERENCES:
patent: 3472233 (1969-10-01), Senbachen
patent: 4462412 (1984-07-01), Turner
Morita and Andersen, "Near-Field Absorption in a Circular Cylinder from Electric and Magnetic Line Sources", Bioelectromagnetics, 3:253-274, (1982).
Andersen, et al., "A Hyperthermia System Using a New Type of Inductive Applicator", IEEE Transactions on Biomedical Engineering, vol. BME-31, No. 1, Jan. 1984.
Raskmark and Andersen, "Focused Electromagnetic Heating of Muscle Tissue", IEEE Transactions on Microwave Theory and Techniques, vol. MTT-32, No. 8, Aug. 1984.
Andersen Jorgen B.
Raskmark Povl
Cohen Lee S.
The Danish Hyperthermia Foundation
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