Patent US4340581A successfully refreshed from Google Patents.
US5201747A
Expired / Lapsed
US
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Ophthalmological surgical instrument having a triple edge tip
Assignee: Individual
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Filing: 1992-02-20
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Granted: 1993-04-13
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Expires: 2012-02-20
Abstract
Abstract An improved surgical knife blade particularly suited to eye surgery having a triple edged truncated point. An elongated, flat diamond blade has a primal end adapted to be supported in a handle or the like and a sharp distal end adapted to penetrate and cut tissue, such as the cornea of the eye in radial keratotomy. The blade has a first edge lying generally parallel to the blade axis and a second edge at the distal blade end converging toward the first edge at a selected angle, optimally about 15°. A flat transverse tip is provided at the meeting point of the first and second edges, at an angle of from about 45° to 135° to the first blade edge. Both edges and the tip are faceted to provide uniformly very sharp edges. This blade will penetrate tissue more easily and under greater control than prior blades so that arcuate transverse incisions may be accurately made in astigmatic keratotomy. Incisions of uniform depth to nearly the ends of the incisions can be made more accurately.
Inventors
- 👤 Douglas Mastel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:25
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/32; A61B17/3209; A61B17/3211; A61F; A61F9/00; A61F9/007; A61F9/013; A61F9/0133
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
108 words
An ophthalmologic surgical blade which comprises: an elongated blade having a primal end adapted to be connected to a support means and a distal end adapted to penetrate and cut tissue; said blade having first and second opposed cutting edges; said first and second edges converging toward each other at an angle of from about 10 to 30 degrees; said edges terminating at a transverse flat tip extending between said edges, said tip having a width of from about 0.05 to 0.30 mm and an angle to said first edge of from about 60° to 120°; and said edges and tip being shaped to provide sharp cutting edges.
Claim 2
Dependent Claim
108 words
An ophthalmologic surgical blade which comprises: an elongated blade having a primal end adapted to be connected to a support means and a distal end adapted to penetrate and cut tissue; said blade having first and second opposed cutting edges; said first and second edges converging toward each other at an angle of from about 10 to 30 degrees; said edges terminating at a transverse flat tip extending between said edges, said tip having a width of from about 0.05 to 0.30 mm and an angle to said first edge of from about 60° to 120°; and said edges and tip being shaped to provide sharp cutting edges.
Claim 3
Dependent Claim
25 words
The ophthalmologic surgical blade according to claim 1 wherein said angle of said flat tip to said first edge is from about 75° to 105°.
Claim 4
Dependent Claim
23 words
The ophthalmologic surgical blade according to claim 1 wherein said second edge lies at an angle to said first edge of about 15°.
Claim 5
Dependent Claim
18 words
The ophthalmologic surgical blade according to claim 1 wherein said tip has a width of approximately 0.20 mm.
Claim 6
Dependent Claim
22 words
The ophthalmologic surgical blade according to claim 1 wherein said blade thickness decreases toward said tip over a portion near said tip.
Claim 7
Dependent Claim
59 words
The ophthalmologic surgical blade according to claim 1 wherein said blade length is about 1.4 mm, width is about 1.0 mm at said primal end, and thickness is about 0.15 mm at the primal end, with the blade thickness tapering over the last 1.5 mm adjacent to said tip at an angle of about 6° to each blade surface.
Claim 8
Dependent Claim
22 words
The ophthalmologic surgical blade according to claim 1 wherein said first edge lies substantially parallel to the long axis of said blade.
Claim 9
Dependent Claim
125 words
An ophthalmologic surgical blade which comprises: an elongated flat blade having a primal end adapted to be supported in a handle and a distal end adapted to penetrate and cut tissue; said blade having first and second opposed cutting edges; said first edge lying substantially parallel to the long axis of said blade; said second edge having a portion converging toward said first edge at an angle of from about 10 to 30 degrees; the intersection of said edges including a transverse flat tip between said edges, said tip having a width of from about 0.50 to 0.30 mm and an angle to said first edge of from about 60° to 12020 ; and said edges and tip being faceted to provide sharp cutting edges.
Claim 10
Dependent Claim
125 words
An ophthalmologic surgical blade which comprises: an elongated flat blade having a primal end adapted to be supported in a handle and a distal end adapted to penetrate and cut tissue; said blade having first and second opposed cutting edges; said first edge lying substantially parallel to the long axis of said blade; said second edge having a portion converging toward said first edge at an angle of from about 10 to 30 degrees; the intersection of said edges including a transverse flat tip between said edges, said tip having a width of from about 0.50 to 0.30 mm and an angle to said first edge of from about 60° to 12020 ; and said edges and tip being faceted to provide sharp cutting edges.
Claim 11
Dependent Claim
25 words
The ophthalmologic surgical blade according to claim 8 wherein said angle of said flat tip to said first edge is from about 75° to 105°.
Claim 12
Dependent Claim
23 words
The ophthalmologic surgical blade according to claim 8 wherein said second edge lies at an angle to said first edge of about 15°.
Claim 13
Dependent Claim
18 words
The ophthalmologic surgical blade according to claim 8 wherein said tip has a width of approximately 0.20 mm.
Claim 14
Dependent Claim
19 words
The ophthalmologic surgical blade according to claim 8 wherein said blade thickness tapers over a portion near said tip.
Claim 15
Dependent Claim
59 words
The ophthalmologic surgical blade according to claim 8 wherein said blade length is about 1.4 mm, width is about 1.0 mm at said primal end, and thickness is about 0.15 mm at the primal end, with the blade thickness tapering over the last 1.5 mm adjacent to said tip at an angle of about 6° to each blade surface.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-04-12 | 1996-10-12 | 1997-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-12 | 2000-10-12 | 2001-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-12 | 2004-10-12 | 2005-04-13 | $7700.00 | Window Closed / Lapsed |