US4357941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Instrument for marking out the central optical zone of the cornea
Assignee: Individual
•
Filing: 1980-09-29
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Granted: 1982-11-09
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Expires: 2000-09-29
Abstract
Abstract An instrument for making out the central optical zone of the cornea having an oblong body featuring the edge of one of its ends sharpened, while the diameter of the body across said end equals a preset diameter of the central optical zone, and a sight is accommodated inside the body square with the longitudinal axis thereof, the sighting point of said sight lying on the longitudinal axis of the oblong body of the instrument.
Inventors
- 👤 Boris P. Golubkov
- 👤 Svyatoslav N. Fedorov
- 👤 Valery V. Durnev, deceased
- 👤 administratrix by Tamara S. Durneva
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:19
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/007; A61F9/013; A61F9/0136; A61B; A61B90/00; A61B90/39; A61B2090/3937
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
80 words
An instrument for marking out the central portion of the optical zone of the cornea, comprising an oblong hollow body featuring the edge of one of its ends sharpened, while the diameter of the body across said end equals a preset diameter of the central optical zone, and a sight accommodated inside the body at right angles with the longitudinal axis thereof, a sighting point of said sight lying on the longitudinal axis of the oblong body of the instrument.
Claim 2
Dependent Claim
80 words
An instrument for marking out the central portion of the optical zone of the cornea, comprising an oblong hollow body featuring the edge of one of its ends sharpened, while the diameter of the body across said end equals a preset diameter of the central optical zone, and a sight accommodated inside the body at right angles with the longitudinal axis thereof, a sighting point of said sight lying on the longitudinal axis of the oblong body of the instrument.
Claim 3
Dependent Claim
28 words
An instrument as claimed in claim 1, wherein the sight is made as a pointed rod, its sighting point lying on the longitudinal axis of the instrument body.
Claim 4
Dependent Claim
53 words
An instrument as claimed in claim 1, wherein the oblong body features two portions, viz., one cylindrical-shaped adapted for holding the instrument during operation, and the other conical-shaped having its edge sharpened into a cutting lip, said cylindrical and conical parts being joined together, the conical part tapering off to the cutting lip.
Claim 5
Dependent Claim
24 words
An instrument as claimed in claim 3, wherein a circumferential groove is provided on the cylindrical portion thereof for convenient holding of the instrument.
Claim 6
Dependent Claim
18 words
An instrument as claimed in claim 3, wherein openings are provided in the conical portion of the body.
Claim 7
Dependent Claim
15 words
An instrument as claimed in claim 1, wherein the body has a number of openings.
Claim 8
Dependent Claim
70 words
An instrument for marking out the central optical zone of the cornea comprising: a generally oblong, hollow body; said body having a diameter at one end thereof substantially equal to a predetermined diameter of said central optical zone; said end having a cutting lip; and sighting means secured in said body substantially perpendicularly to the longitudinal axis thereof; said means having a pointed inner end lying on said longitudinal axis.
Claim 9
Dependent Claim
70 words
An instrument for marking out the central optical zone of the cornea comprising: a generally oblong, hollow body; said body having a diameter at one end thereof substantially equal to a predetermined diameter of said central optical zone; said end having a cutting lip; and sighting means secured in said body substantially perpendicularly to the longitudinal axis thereof; said means having a pointed inner end lying on said longitudinal axis.
Claim 10
Dependent Claim
33 words
The instrument of claim 7, wherein said body includes two portions: a cylindrical portion adapted for holding the instrument during operation, and a conical portion having one end sharpened into said cutting lip.
Claim 11
Dependent Claim
20 words
An instrument as claimed in claim 8, wherein gripping means are provided on said cylindrical portion for holding said instrument.
Claim 12
Dependent Claim
26 words
An instrument as claimed in claim 9, wherein openings are provided in said conical portion of the body between said gripping means and said conical portion.
Claim 13
Dependent Claim
23 words
An instrument as claimed in claim 7, including a plurality of windows to provide better illumination of the optical zone being marked out.
Claim 14
Dependent Claim
16 words
The instrument of claim 7 or 8, wherein said cutting lip is about 0.1 mm thick.
Claim 15
Dependent Claim
37 words
The instrument of claim 8, wherein said sighting means consist of a pointed rod secured to the inner wall of said conical portion, said rod having a sighting point lying on the longitudinal axis of said body.
Claim 16
Dependent Claim
29 words
The instrument of claim 8, wherein the inner wall of a part of said cylindrical portion and part of the inner wall of said conical portion are both conical.
Claim 17
Dependent Claim
43 words
A set of opthalmological instruments comprising a plurality of instruments for marking out the central optical zone of the cornea as defined in claims 7, 8 or 9 having different diameters across the cutting lip thereof for use on corneas of different diameters.
References Cited (Backward Citations)
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US2473968A
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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) | 1985-11-08 | 1986-05-10 | 1986-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-08 | 1990-05-10 | 1990-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-08 | 1994-05-10 | 1994-11-09 | $7700.00 | Window Closed / Lapsed |