US5429583A
Expired / Lapsed
US
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Cobalt palladium seeds for thermal treatment of tumors
Assignee: ATI Medical Inc
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Filing: 1993-12-09
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Granted: 1995-07-04
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Expires: 2013-12-09
Abstract
Abstract A COPd thermoseed for treating cancerous tissue. The alloy constituents are chosen such that the Curie point temperature thereof falls into a therapeutic range. Because its magnetization vs. temperature characteristic exhibits an increasing slope up to the Curie transition, thermoseeds fabricated from the alloy can be optimized about the maximum in the M-T curve.
Inventors
- 👤 Joseph A. Paulus
- 👤 Robert D. Tucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:52
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/40; A61N1/403; A61N1/406
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
62 words
An implantable ferromagnetic thermoseed for treating tumorous tissue comprising: a generally cylindrical, ferromagnetic member having a predetermined radius and length dimension, said member exhibiting a Curie point temperature in a therapeutic range of temperatures and an increasing magnetization with temperature characteristic until said Curie point temperature is approached, said member adapted to produce inductive heat upon exposure to an oscillating magnetic field.
Claim 2
Dependent Claim
62 words
An implantable ferromagnetic thermoseed for treating tumorous tissue comprising: a generally cylindrical, ferromagnetic member having a predetermined radius and length dimension, said member exhibiting a Curie point temperature in a therapeutic range of temperatures and an increasing magnetization with temperature characteristic until said Curie point temperature is approached, said member adapted to produce inductive heat upon exposure to an oscillating magnetic field.
Claim 3
Dependent Claim
19 words
The implantable ferromagnetic thermoseed as in claim 1 wherein said ferromagnetic member is an alloy of cobalt and palladium.
Claim 4
Dependent Claim
28 words
The implantable ferromagnetic thermoseed as in claim 2 wherein said alloy is a binary alloy whose weight percent cobalt is in the range of from 4% to 7%.
Claim 5
Dependent Claim
69 words
An injectable ferromagnetic thermoseed for treating tumorous tissue comprising: a generally cylindrical ferromagnetic member having a predetermined length and radius, said member being an alloy of cobalt and palladium with the atomic percent cobalt being in a range yielding a Curie point temperature in the range of from about 42° C. to about 100° C., said member adapted to produce inductive heat upon exposure to an oscillating magnetic field.
Claim 6
Dependent Claim
69 words
An injectable ferromagnetic thermoseed for treating tumorous tissue comprising: a generally cylindrical ferromagnetic member having a predetermined length and radius, said member being an alloy of cobalt and palladium with the atomic percent cobalt being in a range yielding a Curie point temperature in the range of from about 42° C. to about 100° C., said member adapted to produce inductive heat upon exposure to an oscillating magnetic field.
Claim 7
Dependent Claim
38 words
The injectable ferromagnetic thermoseed as in claim 4 wherein said predetermined radius lies in the range of from 0.2 mm to 2.0 mm and said predetermined length is in a range of from 5 mm to 50 mm.
Claim 8
Dependent Claim
26 words
The injectable ferromagnetic thermoseed as in claim 4 in which said alloy exhibits an increasing magnetization with temperature characteristic until said Curie point temperature is approached.
Claim 9
Independent Claim
138 words
A method of thermally treating cancerous tissue in a body of a patient, comprising the steps of: (a) providing a plurality of cylindrical ferromagnetic members of a predetermined radius and length dimension, said members being an alloy of cobalt and palladium whose percent by weight of cobalt yields a Curie point temperature in a therapeutic range; (b) implanting said members at regularly spaced locations within said cancerous tissue; and (c) subjecting said members to an oscillating magnetic field aligned generally parallel to said length dimension of said members from a location outside of the body of the patient, the frequency of said oscillating magnetic field and the field strength thereof producing continuously increasing heat energy output from said implanted members to surrounding tissue by conduction from said implanted members, until the Curie point of the alloy is reached.
Claim 10
Independent Claim
138 words
A method of thermally treating cancerous tissue in a body of a patient, comprising the steps of: (a) providing a plurality of cylindrical ferromagnetic members of a predetermined radius and length dimension, said members being an alloy of cobalt and palladium whose percent by weight of cobalt yields a Curie point temperature in a therapeutic range; (b) implanting said members at regularly spaced locations within said cancerous tissue; and (c) subjecting said members to an oscillating magnetic field aligned generally parallel to said length dimension of said members from a location outside of the body of the patient, the frequency of said oscillating magnetic field and the field strength thereof producing continuously increasing heat energy output from said implanted members to surrounding tissue by conduction from said implanted members, until the Curie point of the alloy is reached.
Claim 11
Dependent Claim
25 words
The method as in claim 7 wherein the frequency of said oscillating magnetic field is in the range of from 50 kHz to 200 kHz.
Claim 12
Dependent Claim
21 words
The method as claim 7 wherein said Curie point temperature is in the range of from 40° C. to 100° C.
Claim 13
Dependent Claim
28 words
The method as in claim 7 wherein the alloy is a binary alloy whose weight percent cobalt is in the range of from about 4% to about 7%.
References Cited (Backward Citations)
US3653385A
Cited
US4106488A
Cited
US4323056A
Cited
US4735796A
Cited
US4763671A
Cited
US4610241A
Cited
US5087438A
Cited
US4889120A
Cited
US4735772A
Cited
US4813399A
Cited
US4923437A
Cited
US4950221A
Cited
US4996991A
Cited
US5133710A
Cited
JPH0549704A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1998-07-03 | 1999-01-02 | 1999-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-07-03 | 2003-01-02 | 2003-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-07-03 | 2007-01-02 | 2007-07-04 | $7700.00 | Window Closed / Lapsed |