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US4960125A
Expired / Lapsed
US
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Device for low-frequency electrotherapy in a humid environment
Assignee: Individual
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Filing: 1988-10-26
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Granted: 1990-10-02
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Expires: 2008-10-26
Abstract
Abstract Disclosed is a novel device for low-frequency electrotherapy wherein a moisture proof variable resistor is used to control the output level of a low-frequency diphasic action potential circuit. The diphasic circuit produces a voltage having a pulse width of 0.1 to 10 seconds and a frequency off 10 to 300 Hertz superimposed on the voltage having a pulse interval of 0.1 to 10 seconds.
Inventors
- 👤 Kazumi Masaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:04
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/44; A61N1/18; A61N1/32; A61N1/36; A61N1/36014; A61N1/3603; H; H01; H01C; H01C1/00; H01C1/02; H01C1/024; H01C10/00; H01C10/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
210 words
A device to effect low-frequency electrotherapy in a humid environment, comprising: an electrode that acts as a dispersive electrode when in use; another electrode that acts as an active electrode when in use; a transistorized multivibrator generating a positive square wave with a pulse interval of 0.1-10 seconds and a pulse width of 0.1-10 seconds when a load is connected between the electrodes; a transistorized blocking oscillator generating a diphasic action potential with a frequency of 10-300 hertz, said diphasic action potential having a spike in respective voltage components in positive and negative directions and said blocking oscillator having an output terminal connected with said active electrode; a transistorized saturating circuit having an input terminal connected with an output terminal of said multivibrator, and also having an output terminal connected with a base of said transistorized blocking oscillator; a battery means to energize the whole circuit; and a variable resistor connected between the output terminal of said blocking oscillator and said active electrode, said variable resistor comprising; a resistive element; a sliding member slidable along with said resistive element; a moisture proof container enclosing said resistive element and sliding member; and a guide member attached outside said container, said guide member is movable magnetically in association with said sliding member.
Claim 2
Independent Claim
210 words
A device to effect low-frequency electrotherapy in a humid environment, comprising: an electrode that acts as a dispersive electrode when in use; another electrode that acts as an active electrode when in use; a transistorized multivibrator generating a positive square wave with a pulse interval of 0.1-10 seconds and a pulse width of 0.1-10 seconds when a load is connected between the electrodes; a transistorized blocking oscillator generating a diphasic action potential with a frequency of 10-300 hertz, said diphasic action potential having a spike in respective voltage components in positive and negative directions and said blocking oscillator having an output terminal connected with said active electrode; a transistorized saturating circuit having an input terminal connected with an output terminal of said multivibrator, and also having an output terminal connected with a base of said transistorized blocking oscillator; a battery means to energize the whole circuit; and a variable resistor connected between the output terminal of said blocking oscillator and said active electrode, said variable resistor comprising; a resistive element; a sliding member slidable along with said resistive element; a moisture proof container enclosing said resistive element and sliding member; and a guide member attached outside said container, said guide member is movable magnetically in association with said sliding member.
Claim 3
Dependent Claim
17 words
The device of claim 1 wherein said variable resistor has a switch connection on said variable resistor.
Claim 4
Dependent Claim
13 words
The device of claim 1 wherein said variable resistor is rotary variable resistor.
Claim 5
Dependent Claim
14 words
The device of claim 1 wherein said variable resistor is a slide variable resistor.
Claim 6
Dependent Claim
23 words
The device of claim 1 wherein at least one of said sliding member and said guide member is at least partially a magnet.
Claim 7
Dependent Claim
20 words
The device of claim 5 wherein both said sliding member and said guide member are at least partially a magnet.
Claim 8
Dependent Claim
16 words
The device of claim 1 wherein said variable resistor is immersed in bath water during use.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-01 | 1994-04-02 | 1994-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-01 | 1998-04-02 | 1998-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-01 | 2002-04-02 | 2002-10-02 | $7700.00 | Window Closed / Lapsed |