Patent US4161950A successfully refreshed from Google Patents.
US4161950A
Expired / Lapsed
US
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Electrosurgical knife
Assignee: United States Department of Energy
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Filing: 1975-08-01
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Granted: 1979-07-24
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Expires: 1995-08-01
Abstract
Abstract An electrosurgical knife blade of insulating material having a pair of electrodes adapted to be connected to a radiofrequency generator.
Inventors
- 👤 James D. Doss
- 👤 Robert E. Cowan
- 👤 Robert H. Newell
- 👤 Charles W. McCabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:45
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/04; A61B18/12; A61B18/14; A61B18/1402; A61B2018/00053; A61B2018/00059; A61B2018/00071; A61B2018/00077; A61B2018/00107; A61B2018/00148; A61B2018/1405; A61B2018/1412
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
55 words
A surgical implement adapted for use with a radiofrequency generator comprising: a blade of insulating material; a sharp cutting edge formed integrally of said insulating material on at least one edge of said blade, and, first and second conductive electrodes insulated from one another secured to said blade of insulating material adjacent said cutting edge.
Claim 2
Dependent Claim
55 words
A surgical implement adapted for use with a radiofrequency generator comprising: a blade of insulating material; a sharp cutting edge formed integrally of said insulating material on at least one edge of said blade, and, first and second conductive electrodes insulated from one another secured to said blade of insulating material adjacent said cutting edge.
Claim 3
Dependent Claim
36 words
In the surgical implement set forth in claim 1, a first electrode being placed on one side of said blade of insulating material and a second electrode being placed on the other side of said blade.
Claim 4
Dependent Claim
25 words
In the surgical implement set forth in claim 1, said first and second electrodes each having comb-shaped teeth, said teeth being interspersed between one another.
Claim 5
Dependent Claim
33 words
In the surgical implement set forth in claim 3, said first and second electrodes being secured on the same side of said blade, and an insulating layer interposed between said pair of electrodes.
Claim 6
Dependent Claim
63 words
A surgical implement adapted for use with a radiofrequency generator comprising: a blade of insulating material having a sharp cutting edge; a first conductive electrode secured on one side of said blade adjacent said cutting edge; a second conductive electrode secured on the other side of said blade adjacent said cutting edge, whereby said first and second electrodes are insulated from one another.
Claim 7
Dependent Claim
63 words
A surgical implement adapted for use with a radiofrequency generator comprising: a blade of insulating material having a sharp cutting edge; a first conductive electrode secured on one side of said blade adjacent said cutting edge; a second conductive electrode secured on the other side of said blade adjacent said cutting edge, whereby said first and second electrodes are insulated from one another.
Claim 8
Dependent Claim
55 words
A surgical implement adapted for use with a radiofrequency generator comprising: a blade of insulating material having a sharp cutting edge; a first electrode on said blade secured to said blade adjacent said cutting edge; a second electrode secured substantially overlying said first electrode; and, means insulating said first and second electrodes from one another.
Claim 9
Dependent Claim
55 words
A surgical implement adapted for use with a radiofrequency generator comprising: a blade of insulating material having a sharp cutting edge; a first electrode on said blade secured to said blade adjacent said cutting edge; a second electrode secured substantially overlying said first electrode; and, means insulating said first and second electrodes from one another.
Claim 10
Dependent Claim
40 words
In the surgical implement set forth in claim 6: said first electrode having an array of comb-shaped teeth adjacent said cutting edge; and, said second electrode having an array of comb-shaped teeth interspersed between said teeth on said first electrode.
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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) | 1982-07-23 | 1983-01-22 | 1983-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-23 | 1987-01-22 | 1987-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-23 | 1991-01-22 | 1991-07-24 | $7700.00 | Window Closed / Lapsed |