US4292968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric supply for ion therapy
Assignee: MDT Corp
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Filing: 1979-11-26
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Granted: 1981-10-06
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Expires: 1999-11-26
Abstract
Abstract A power supply provides direct current to electrodes attached to a patient. The positive electrode is at least partially silver and releases silver ions as a result of the electric current. Silver ions have known bactericidal properties and may be used to treat infected living tissue. Tissue may, however, be damaged by voltages in excess of 1.1 volts. Accordingly, the power supply has two modes. Under normal conditions the power supply has a constant current output. If the voltage between the electrodes reaches a reference voltage of not more than 1.1 volt, the output is changed to a constant voltage mode, abruptly limiting the output voltage. A mode indicator may be incorporated in the supply.
Inventors
- 👤 Franklin H. Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:56
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/20; A61N1/30; A61N1/32; A61N1/36; A61N1/36014; A61N1/3603; G; G05; G05F; G05F1/00; G05F1/10; G05F1/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
Apparatus for ion therapy characterized by having two modes of operation and comprised of: two electrodes for making electrical contact with a patient; current means electrically connected to said electrodes for providing constant direct current flow through the electrodes during a first mode; voltage means electrically connected to said electrodes for providing a constant predetermined direct current voltage of less than 1.1 volts across the electrodes during a second mode; and voltage responsive means for causing an abrupt transition from the first mode to the second mode if the voltage across the electrodes reaches said predetermined voltage.
Claim 2
Dependent Claim
97 words
Apparatus for ion therapy characterized by having two modes of operation and comprised of: two electrodes for making electrical contact with a patient; current means electrically connected to said electrodes for providing constant direct current flow through the electrodes during a first mode; voltage means electrically connected to said electrodes for providing a constant predetermined direct current voltage of less than 1.1 volts across the electrodes during a second mode; and voltage responsive means for causing an abrupt transition from the first mode to the second mode if the voltage across the electrodes reaches said predetermined voltage.
References Cited (Backward Citations)
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US3521641A
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US4102347A
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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) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |