Surgery – Truss – Pad
Patent
1985-05-20
1987-07-14
Cohen, Lee S.
Surgery
Truss
Pad
128401, 128784, 128804, A61N 132
Patent
active
046795618
ABSTRACT:
With the object of repetitively treating deep-seated, inoperable tumors by hyperthermia as well as locally heating other internal tissue masses repetitively, a receiving antenna, transmission line, and electrode arrangment are implanted completely within the patient's body, with the receiving antenna just under the surface of the skin and with the electrode arrangement being located so as to most effectively heat the tissue to be treated. An external, transmitting antenna, driven by an external radio-frequency energy source, is closely coupled to the implanted receiving antenna so that the energy coupled across the air-skin interface provides electromagnetic energy suitable for heating the tissue in the vicinity of the implanted electrodes. The resulting increase in tissue temperature may be estimated by an indirect measurement of the decrease in tissue resistivity in the heated region. This change in resistivity appears as a change in the loading of the receiving antenna which can be measured by either determining the change in the phase relationship between the voltage and the current appearing on the transmitting antenna or by measuring the change in the magnitude of the impedance thereof. Optionally, multiple electrode arrays may be activated or inactivated by the application of magnetic fields to operate implanted magnetic reed switches.
REFERENCES:
patent: 3796221 (1974-03-01), Hagfors
patent: 4016886 (1977-04-01), Doss et al.
patent: 4095602 (1978-06-01), LeVeen
patent: 4154246 (1979-05-01), LeVeen
patent: 4186729 (1980-02-01), Harrison
patent: 4346715 (1982-08-01), Gammell
patent: 4378806 (1983-04-01), Henley-Cohn
patent: 4397314 (1983-08-01), Vaguine
patent: 4448198 (1984-05-01), Turner
Cohen Lee S.
Freund Samuel M.
Hightower Judson R.
The United States of America as represented by the United States
Wilson Ray G.
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