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US3841306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Implantable, non-contacting nerve stimulating transducer
Assignee: Iowa State University Research Foundation Inc
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Filing: 1972-10-25
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Granted: 1974-10-15
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Expires: 1992-10-25
Abstract
Abstract An implantable transducer for stimulating a nerve without contacting it includes a subcutaneous receiver coil having a low number of turns, of the order of six, which is implantable in an accessible location. A magnetic core including first and second separable sections is placed to form a complete magnetic path around the nerve desired to be stimulated, and an excitation coil having about three turns is wound around one section of the core. A pair of conducting wires connect the excitation coil with the receiver coil. The nerve is stimulated by placing an external coil of like dimensions adjacent the receiver coil and pulsing it electrically.
Inventors
- 👤 R Hallgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:34
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/40; A61N1/18; A61N1/32; A61N1/36; A61N1/372
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
133 words
Apparatus for external stimulation of a nerve in a body without contacting the body comprising: a transducer adapted to be implanted in said body including low reluctance magnetic means comprising first and second magnetic members for surrounding a nerve selected to be stimulated and providing a central lumen through which said nerve passes when said first and second members are in assembled relation; an excitation coil including approximately three turns of conducting wire wound around one of said members; a receiver coil adapted to be implanted in said body and including approximately six turns of wire; conductor means connecting said excitation coil with said receiving coil and adapted to be located subcutaneously; and controller means adapted to energize said receiver coil externally of said body for transmitting electrical pulses to said receiver coil.
Claim 2
Dependent Claim
133 words
Apparatus for external stimulation of a nerve in a body without contacting the body comprising: a transducer adapted to be implanted in said body including low reluctance magnetic means comprising first and second magnetic members for surrounding a nerve selected to be stimulated and providing a central lumen through which said nerve passes when said first and second members are in assembled relation; an excitation coil including approximately three turns of conducting wire wound around one of said members; a receiver coil adapted to be implanted in said body and including approximately six turns of wire; conductor means connecting said excitation coil with said receiving coil and adapted to be located subcutaneously; and controller means adapted to energize said receiver coil externally of said body for transmitting electrical pulses to said receiver coil.
Claim 3
Dependent Claim
46 words
The system of claim 1 wherein said external excitation means includes a transmitter coil having a diameter approximately equal to the diameter of said receiving coil and is placed next to said receiving coil; and means for periodically exciting said transmitter coil with pulsed electrical current.
Claim 4
Dependent Claim
36 words
The system of claim 2 wherein said receiver coil has six turns of conducting wire with an approximate diameter of 2.5 X 10 2 meters and an inductance equal to approximately 6 X 10 6 henrys.
Claim 5
Dependent Claim
41 words
The system of claim 3 wherein excitation means comprises a capacitor; means for charging said capacitor; and a switch connected in series with said transmitter coil whereby when said switch closes, said capacitor is discharged to provide said pulsed electrical current.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |