US4483338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bi-Polar electrocautery needle
Assignee: Medtronic Inc
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Filing: 1981-06-12
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Granted: 1984-11-20
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Expires: 2001-06-12
Abstract
Abstract A bi-polar electrocautery needle comprising an inner electrode, an outer electrode and recoverable insulating-locking member for insulating the electrodes from one another and locking them into relative position to one another. And the method of making the bi-polar electrocautery needle in accordance with this invention, the steps including: expanding recoverable dielectric material over an inner electrode; inserting the combination into an outer electrode, and recovering the material between the electrodes for insulating and locking the electrodes into relative position with one another.
Inventors
- 👤 William G. Bloom
- 👤 Gary I. Geschwind
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:06
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/04; A61B18/12; A61B18/14; A61B18/1402; A61B2018/00315; A61B2018/00452; A61B2018/00476; A61F; A61F9/00; A61F9/007; A61F9/0079
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
A bi-polar electrocautery needle, comprising: an inner electrode; an outer electrode concentric with the inner electrode; said electrodes having one end defining an operable tip and an opposed end adapted to be connected to a source of power; and insulating-locking means disposed between the electrodes, the insulating-locking means being in compression exerting a force in the radial direction on both electrodes, said insulating-locking means locking the electrodes in fixed relation to one another and insulating the electrodes from each other.
Claim 2
Dependent Claim
80 words
A bi-polar electrocautery needle, comprising: an inner electrode; an outer electrode concentric with the inner electrode; said electrodes having one end defining an operable tip and an opposed end adapted to be connected to a source of power; and insulating-locking means disposed between the electrodes, the insulating-locking means being in compression exerting a force in the radial direction on both electrodes, said insulating-locking means locking the electrodes in fixed relation to one another and insulating the electrodes from each other.
Claim 3
Dependent Claim
18 words
The needle as set forth in claim 1 wherein the insulating-locking means comprises a polymeric heat recoverable material.
Claim 4
Dependent Claim
32 words
The needle as set forth in claim 1 wherein the insulating-locking means comprises a cross-linked polymeric material which is heat recoverable and capable of withstanding high electrical power carried by the electrodes.
Claim 5
Dependent Claim
18 words
The needle as set forth in either claim 1 or claim 3 wherein the inner electrode is solid.
Claim 6
Dependent Claim
27 words
The needle as set forth in claim 4 wherein the one end of the electrodes is ground into a pencil point-like tip for generating short current paths.
Claim 7
Dependent Claim
15 words
The needle as in claim 1 or claim 3 wherein the inner electrode is hollow.
Claim 8
Dependent Claim
25 words
The needle as set forth in claim 6 wherein the one end of the electrodes is ground to a tip for generating short current paths.
Claim 9
Dependent Claim
17 words
The needle as set forth in claim 3 wherein the electrodes comprise substantially uniform cross-section tubular electrodes.
Claim 10
Dependent Claim
18 words
The needle as set forth in claim 1 wherein the means comprises cross-linked heat recoverable Tefzel 1 .
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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) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |