US4785807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrosurgical knife
Assignee: MegaDyne Medical Products Inc
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Filing: 1987-02-24
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Granted: 1988-11-22
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Expires: 2007-02-24
Abstract
Abstract An electrosurgical knife includes a stainless steel blade whose surface is abraided or etched, a first coat of primer material applied over the blade, where the surface of the primer material is also abraided or etched, and a second coat of non-stick fluorinated hydrocarbon material applied over the coat of primer material to cover the primer material, for a total thickness of about three mils. The stainless steel blade is completely covered by the coatings but the thickness of the coatings is not so great as to prevent conduction of radio-frequency electrical energy from the blade through the coatings to tissue being cut.
Inventors
- 👤 G. Marsden Blanch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:21
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/04; A61B18/12; A61B18/14; A61B18/1402; A61B18/1206; A61B18/1233; A61B2018/00053; A61B2018/00107; A61B2018/1405; A61B2018/1412; A61B2018/1422
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
105 words
An electrosurgical instrument for use with a source of radio-frequency electrical energy during surgery to cauterize tissue, said instrument comprising: a. a stainless steel portion of said instrument for receiving said radio-frequency energy and having at least one flesh contacting surface formed thereon, b. a first coat of primer material covering at least all of said flesh contacting surface, and c. a second coat of fluorinated hydrocarbon material entirely covering the primer material to cause a total thickness of the first and second coats of about 3 mils thereby enabling said radio-frequency energy to be transported across said coatings to said flesh by capacitive coupling.
Claim 2
Dependent Claim
105 words
An electrosurgical instrument for use with a source of radio-frequency electrical energy during surgery to cauterize tissue, said instrument comprising: a. a stainless steel portion of said instrument for receiving said radio-frequency energy and having at least one flesh contacting surface formed thereon, b. a first coat of primer material covering at least all of said flesh contacting surface, and c. a second coat of fluorinated hydrocarbon material entirely covering the primer material to cause a total thickness of the first and second coats of about 3 mils thereby enabling said radio-frequency energy to be transported across said coatings to said flesh by capacitive coupling.
Claim 3
Dependent Claim
16 words
An electrosurgical knife as in claim 1 wherein said flesh contacting surface is an abraded surface.
Claim 4
Dependent Claim
19 words
An electrosurgical knife as in claim 2 wherein said first coat of primer material has an abraded outer surface.
Claim 5
Dependent Claim
27 words
An electrosurgical knife as in claim 1 wherein said second coat of material is composed of Teflon product 455-119 which inhibits build-up of charred tissue during surgery.
Claim 6
Dependent Claim
84 words
An electrosurgical knife for utilizing radio-frequency energy to cause hemostasis during surgery comprising: a. a stainless steel blade at least a part of whose surface is abraded, b. a first coat of primer material covering said abraded surface of said blade, and c. a second coat of non-stick fluorinated hydrocarbon material completely covering said primer material only to a thickness sufficient to ensure transmission of radio-frequency electrical energy from said blade to said flesh essentially exclusively by capacitive coupling to cause hemostasis during surgery.
Claim 7
Dependent Claim
84 words
An electrosurgical knife for utilizing radio-frequency energy to cause hemostasis during surgery comprising: a. a stainless steel blade at least a part of whose surface is abraded, b. a first coat of primer material covering said abraded surface of said blade, and c. a second coat of non-stick fluorinated hydrocarbon material completely covering said primer material only to a thickness sufficient to ensure transmission of radio-frequency electrical energy from said blade to said flesh essentially exclusively by capacitive coupling to cause hemostasis during surgery.
Claim 8
Dependent Claim
23 words
An electrosurgical knife as in claim 5 wherein the first coat of material is a Dupont primer product 850-300 mixed with VN 7799.
Claim 9
Dependent Claim
25 words
An electrosurgical knife as in claim 6 wherein the second coat of material is Teflon product 455-119 which inhibits build-up of charred tissue during surgery.
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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) | 1991-11-22 | 1992-05-23 | 1992-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-22 | 1996-05-23 | 1996-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-22 | 2000-05-23 | 2000-11-22 | $7700.00 | Window Closed / Lapsed |