US4154246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Field intensification in radio frequency thermotherapy
Assignee: Thermal Developments Inc
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Filing: 1977-07-25
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Granted: 1979-05-15
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Expires: 1997-07-25
Abstract
Abstract A technique in the treatment of tumors in humans utilizing radio frequency electromagnetic radiation to produce necrosis of the tumors by which intensification at the situs of the tumor of a radio frequency field applied across the portion of the body containing the tumor is obtained by positioning a small inductance element preferably in the form of a closed resonant circuit such that the inductance is in or adjacent to the tumor tissue and thus functions to concentrate the field at that location. Alternatively, rather than utilizing a resonant circuit, the inductance can be coupled to the output of the radio frequency generator utilized and applies the radio frequency electromagnetic field.
Inventors
- 👤 Harry H. Leveen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:39
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/18; A61N; A61N1/00; A61N1/40; A61N1/403; A61N1/406
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
120 words
In the process of treating a naturally occurring tumor in a human by positioning the portion of the body containing the tumor in a radio frequency electromagnetic field thereby to heat the tumor tissue in said portion of said body by adsorption of energy from said radio frequency electromagnetic field for a period of time and with intensity sufficient to cause necrosis of the tumor, but insufficient to cause significant damage to the adjacent normal tissue in said field, the improvement which includes implanting an inductance element in the vicinity of said tumor which is part of a circuit tuned to the frequency of said field thereby to increase the intensity of said field in the vicinity of said tumor.
Claim 2
Dependent Claim
120 words
In the process of treating a naturally occurring tumor in a human by positioning the portion of the body containing the tumor in a radio frequency electromagnetic field thereby to heat the tumor tissue in said portion of said body by adsorption of energy from said radio frequency electromagnetic field for a period of time and with intensity sufficient to cause necrosis of the tumor, but insufficient to cause significant damage to the adjacent normal tissue in said field, the improvement which includes implanting an inductance element in the vicinity of said tumor which is part of a circuit tuned to the frequency of said field thereby to increase the intensity of said field in the vicinity of said tumor.
Claim 3
Dependent Claim
14 words
A method according to claim 1 in which said radio frequency is 13.56 Megahertz.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-14 | 1982-11-13 | 1983-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-14 | 1986-11-13 | 1987-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-14 | 1990-11-13 | 1991-05-15 | $7700.00 | Window Closed / Lapsed |