US4589411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrosurgical spark-gap cutting blade
Assignee: Individual
•
Filing: 1985-02-08
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Granted: 1986-05-20
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Expires: 2005-02-08
Abstract
Abstract A spark-gap cutting blade for an electrosurgical active electrode pencil which has a central electrode surrounded by an insulator and a series of alternating electrically conductive and insulative elements. The central electrode is electrically connected to one side of a high voltage source and the last electrically conductive element in the series is connected to the other side.
Inventors
- 👤 Aaron Friedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:18
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/04; A61B18/08; A61B18/10; A61B18/12; A61B18/14; A61B18/1402; A61B2018/00636; A61B2018/00642; A61B2018/1405; A61B2018/1412
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
121 words
A spark-gap cutting blade for an electrosurgical active electrode pencil which comprises: (a) a central electrode terminating in an exposed first electrically conductive element; (b) an insulator surrounding the central electrode except the first electrically conductive element; (c) a series of electrically insulative elements alternating with electrically conductive elements disposed upon the insulator surrounding the central electrode, said series of insulative and conductive elements forming, together with the first electrically conductive element, a spark-gap cutting surface; (d) an electrical connector connecting the central electrode to one side of a high voltage source; and; (e) an electrical connector connecting the last electrically conductive element in the series of alternating insulative and conductive elements to the other side of a high voltage source.
Claim 2
Dependent Claim
121 words
A spark-gap cutting blade for an electrosurgical active electrode pencil which comprises: (a) a central electrode terminating in an exposed first electrically conductive element; (b) an insulator surrounding the central electrode except the first electrically conductive element; (c) a series of electrically insulative elements alternating with electrically conductive elements disposed upon the insulator surrounding the central electrode, said series of insulative and conductive elements forming, together with the first electrically conductive element, a spark-gap cutting surface; (d) an electrical connector connecting the central electrode to one side of a high voltage source; and; (e) an electrical connector connecting the last electrically conductive element in the series of alternating insulative and conductive elements to the other side of a high voltage source.
Claim 3
Dependent Claim
27 words
The spark-gap cutting blade of claim 1 wherein the central electrode, the first electrically conductive element and the remaining electrically conductive elements are fabricated of stainless steel.
Claim 4
Dependent Claim
26 words
The spark-gap cutting blade of claim 1 wherein the central electrode, the first electrically conductive element and the remaining electrically conductive elements are fabricated of nichrome.
Claim 5
Dependent Claim
17 words
The spark-gap cutting blade of claim 1 wherein the electrically insulative elements are fabricated from a polyamide.
Claim 6
Dependent Claim
20 words
The spark-gap cutting blade of claim 1 wherein the insulator surrounding the central electrode is fabricated from a polytetrafluoroethylene resin.
Claim 7
Dependent Claim
21 words
The spark-gap cutting blade of claim 1 wherein the electrically insulative elements possess a thickness of from 0.002 to 0.003 inches.
Claim 8
Dependent Claim
21 words
The spark-gap cutting blade of claim 1 wherein the electrically conductive elements possess a thickness of from 0.002 to 0.003 inches.
Claim 9
Dependent Claim
44 words
The spark-gap cutting blade of claim 1 wherein the central electrode is connected to the positive side of a high voltage power source and the last electrically conductive element in the series is connected to the negative side of the high voltage power source.
Claim 10
Dependent Claim
44 words
The spark-gap cutting blade of claim 1 wherein the central electrode in connected to the negative side of a high voltage power source and the last electrically conductive element in the series is connected to the positive side of the high voltage power source.
Claim 11
Dependent Claim
16 words
The spark-gap cutting blade of claim 1 wherein the cutting blade is circular, in cross section.
Claim 12
Dependent Claim
16 words
The spark-gap cutting blade of claim 1 wherein the cutting blade is elliptical in cross section.
Claim 13
Dependent Claim
16 words
The spark-gap cutting blade of claim 1 wherein the cutting blade is convex in cross section.
Claim 14
Dependent Claim
16 words
The spark-gap cutting blade of claim 1 wherein the cutting blade is concave in cross section.
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) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |