Patent US3844279A successfully refreshed from Google Patents.
US4776086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for hyperthermia treatment
Assignee: KASEVICH ASSOCIATES Inc 175 V NEW BOSTON STREET WOBURN MASSACHUSETTS 01888-1859 A MASSACHUSETTS CORP
•
Filing: 1987-09-24
•
Granted: 1988-10-11
•
Expires: 2007-09-24
Abstract
Abstract A microwave collinear antenna array applicator for in situ or in vivo treatment of tumors and/or other materials by hyperthermia is disclosed. The array consists of a plurality of harmonically related resonant coaxial antenna elements connected electrically in series to provide uniform heating along the entire length of the array. At the distal end of the array, a resistor may be provided at the inner conductor for steering the heating pattern. At the proximal end of the array, an impedance matching dielectric structure is provided to enable maximum power transfer to the array and to minimize stray leakage currents along the outside of the coaxial transmission line. The array may be made longer or shorter without changing frequency and therefore, depth of penetration by simply adding or subtracting half-wave resonant elements or sections of coaxial transmission line. A lossy sleeve member may be provided around the applicator to provide a localized source of heat.
Inventors
- 👤 Raymond S. Kasevich
- 👤 James F. McQueeney
- 👤 Ronald H. Crooker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:43
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/06; H01Q21/08; A; A61; A61B; A61B18/00; A61B18/18; A61B18/1815; A61B2018/00053; A61B2018/00273; A61B2018/00279; A61B2018/00285; A61B2018/00571; A61B2018/00577; A61B2018/00636; A61B2018/00696; A61B2018/00738; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49123
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
116 words
The method of forming a small diameter electromagnetic radiation applicator having a distal section and a proximal section and comprised of an inner conductor and an outer coaxial conductor comprising the steps of: (a) forming a dielectric inner core layer around the inner conductor; (b) masking radial strips about the periphery of the dielectric layer at harmonically related distances along the length of said inner conductor at the distal section thereof; (c) coating the unmasked portions of the dielectric layer with a thin metallic conductive layer to form said outer coaxial conductor; (d) forming an impedance matching transformer at the proximal section; and (e) forming a protective dielectric sheath layer ovor the distal and proximal sections.
Claim 2
Independent Claim
116 words
The method of forming a small diameter electromagnetic radiation applicator having a distal section and a proximal section and comprised of an inner conductor and an outer coaxial conductor comprising the steps of: (a) forming a dielectric inner core layer around the inner conductor; (b) masking radial strips about the periphery of the dielectric layer at harmonically related distances along the length of said inner conductor at the distal section thereof; (c) coating the unmasked portions of the dielectric layer with a thin metallic conductive layer to form said outer coaxial conductor; (d) forming an impedance matching transformer at the proximal section; and (e) forming a protective dielectric sheath layer ovor the distal and proximal sections.
Claim 3
Dependent Claim
64 words
The method of claim 1 wherein the transformer is formed by: (f) coating the proximal section after step (c) with an impedance matching layer of dielectric material, matched to the dielectric constant of the media in which the applicator will be used; and (g) forming a metallic tubular layer over said impedance matching layer in contact at one end with said outer coaxial conductor.
Claim 4
Dependent Claim
14 words
The method of claim 2 wherein said impedance matching layer is formed of polyacrylamide.
Claim 5
Dependent Claim
32 words
The method of claim 1 wherein the masking strips are three in number and are located respectively one-quarter wavelength, three-quarter wavelength, and five-quarter wavelength from the distal end of the inner conductor.
Claim 6
Dependent Claim
35 words
The method of claim 1 wherein the frequency of the radiation is about 915 megahertz, the length of the transformer is about 1 centimeter and the length of the distal section is about 10 centimeters.
Claim 7
Dependent Claim
15 words
The method of claim 1 wherein fiberoptic thermometry sensors are embedded in the sheath layer.
Claim 8
Dependent Claim
13 words
The method of claim 2 wherein the metallic layer is formed of silver.
Claim 9
Dependent Claim
131 words
An adaptor for coupling the inner and outer conductors of small diameter coaxial line microwave hyperthermia applicators to larger diameter standard coaxial line cables wherein said inner and outer conductors are separated by a dielectric core, comprising: (a) a transition pin adapted to fit over an extension of inner conductor for insertion into the inner conductor of the standard cable; (b) an insulative sleeve fitted over an extension of said core with a grooved space formed between said sleeve and said pin; (c) a metallic conductive ring affixed around the outer conductor over an extension thereof which abuts said sleeve; and (d) an elastomeric conductive sleeve retaining member adapted to fit around the outer portion of said standard cable and said ring for retaining said applicator and cable in interlocking relationship.
Claim 10
Dependent Claim
131 words
An adaptor for coupling the inner and outer conductors of small diameter coaxial line microwave hyperthermia applicators to larger diameter standard coaxial line cables wherein said inner and outer conductors are separated by a dielectric core, comprising: (a) a transition pin adapted to fit over an extension of inner conductor for insertion into the inner conductor of the standard cable; (b) an insulative sleeve fitted over an extension of said core with a grooved space formed between said sleeve and said pin; (c) a metallic conductive ring affixed around the outer conductor over an extension thereof which abuts said sleeve; and (d) an elastomeric conductive sleeve retaining member adapted to fit around the outer portion of said standard cable and said ring for retaining said applicator and cable in interlocking relationship.
References Cited (Backward Citations)
US3230957A
Cited
US3810186A
Cited
US3800802A
Cited
FR2303517A1
Cited
US4204549A
Cited
US4138188A
Cited
US4374458A
Cited
SU787043A1
Cited
US4240445A
Cited
US4271848A
Cited
US4341227A
Cited
US4403618A
Cited
US4345370A
Cited
US4358764A
Cited
EP0105677A1
Cited
US4662383A
Cited
US4583556A
Cited
US4660007A
Cited
US4612940A
Cited
US4658836A
Cited
US4700716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-11 | 1992-04-11 | 1992-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-11 | 1996-04-11 | 1996-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-11 | 2000-04-11 | 2000-10-11 | $7700.00 | Window Closed / Lapsed |