US4953969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for correcting ocular refraction anomalies
Assignee: INSTITUT TEPLOFIZIKI
•
Filing: 1989-07-11
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Granted: 1990-09-04
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Expires: 2009-07-11
Abstract
Abstract The device comprises optically interconnected components such as an ultraviolet pulsed laser operating at a wavelength of 223 nm, a uniform light beam former, a slotted mask with its rotation drive, and a means for forming the image of the slotted mask on a surface of the cornea of the eye. The slotted mask having at least two slots shaped as identical lobes provides in rotation for uniform axysymmetric distribution of ultraviolet radiation over the exposed surface of the cornea. Arranged at the optical outlet of the former are a unit used to monitor energy density of ultraviolet radiation and a microscope.
Inventors
- 👤 Svyatoslav N. Fedorov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:29
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/007; A61F9/008; A61F9/00802; A61F9/00804; A61F9/00817; A61F2009/00861; A61F2009/00872
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
95 words
A method for correcting ocular refraction anomalies, which comprises making pulsed ultraviolet radiation with a 223 nm wavelength and a 5 to 50 ns pulse length incident on the surface of the eye, said pulse having the shape close to rectangular, simultaneously assigning the distribution of said ultraviolet radiation across the surface of the cornea and evaporating the cornea in lamellae until a desired correction of refraction anomalies is obtained, in so doing, the density of energy of said ultraviolet radiation is taken such as to ensure uniform evaporation of the surface of the cornea.
Claim 2
Independent Claim
95 words
A method for correcting ocular refraction anomalies, which comprises making pulsed ultraviolet radiation with a 223 nm wavelength and a 5 to 50 ns pulse length incident on the surface of the eye, said pulse having the shape close to rectangular, simultaneously assigning the distribution of said ultraviolet radiation across the surface of the cornea and evaporating the cornea in lamellae until a desired correction of refraction anomalies is obtained, in so doing, the density of energy of said ultraviolet radiation is taken such as to ensure uniform evaporation of the surface of the cornea.
Claim 3
Dependent Claim
20 words
A method as claimed in claim 1, which comprises feeding of up to 10 4 pulses of said ultraviolet radiation.
Claim 4
Dependent Claim
24 words
A method as claimed in claim 1, which comprises feeding the pulses of said ultraviolet radiation with a frequency of 5 to 25 Hz.
Claim 5
Dependent Claim
28 words
A method as claimed in claim 1, which comprises taking the density of energy of said ultraviolet radiation in an amount from 120 to 1200 mJ/cm 2 .
Claim 6
Dependent Claim
28 words
A method as claimed in claim 1, which comprises focusing said ultraviolet radiation on the surface of the cornea into a spot 3 to 6 mm in diameter.
Claim 7
Dependent Claim
35 words
A method as claimed in claim 1, which comprises ensuring axisymmetrical distribution of said ultraviolet radiation whose exposition varies from the center of the area of the effect of said ultraviolet radiation toward its periphery.
Claim 8
Dependent Claim
31 words
A method as claimed in claim 2 or 3 or 5 or 6, which comprises taking the density of energy of said ultraviolet radiation from 120 to 1200 mJ/cm 2 .
Claim 9
Dependent Claim
30 words
A method as claimed in claim 2 or 4, or 5, or 6, which comprises feeding the pulses of said ultraviolet radiation with a frequency of 5 to 25 Hertz.
Claim 10
Dependent Claim
34 words
A method as claimed in claim 2 or 3, or 4, or 6, which comprises focusing said ultraviolet radiation on the surface of the cornea into a spot 3 to 6 mm in diameter.
Claim 11
Dependent Claim
41 words
A method as claimed in claim 2 or 3, or 4, or 5, which comprises ensuring axisymmetrical distribution of said ultraviolet radiation whose exposition varies from the center of the area of the effect of said ultraviolet radiation toward its periphery.
Claim 12
Dependent Claim
30 words
A method as claimed in claim 3 or 4, or 5, or 6, which comprises feeding the pulses of said ultraviolet radiation with a frequency of 10 to 15 Hertz.
Claim 13
Dependent Claim
29 words
A method as claimed in claim 4, or 5, or 6, which comprises taking the density of energy of said ultraviolet radiation from 150 to 600 mJ/cm 2 .
Claim 14
Dependent Claim
29 words
A method as claimed in claim 4 or 5, or 6, which comprises taking the density of energy of said ultraviolet radiation from 600 to 900 mJ/cm 2 .
Claim 15
Dependent Claim
28 words
A method as claimed in claim 5 or 6, which comprises focusing said ultraviolet radiation on the surface of the cornea into a spot 5 mm in diameter.
Claim 16
Dependent Claim
25 words
A method as claimed in claim 7, which comprises taking the density of energy of said ultraviolet radiation from 150 to 600 mJ/cm 2 .
Claim 17
Dependent Claim
25 words
A method as claimed in claim 7, which comprises taking the density of energy of said ultraviolet radiation from 600 to 900 mJ/cm 2 .
Claim 18
Dependent Claim
24 words
A method as claimed in claim 8, which comprises feeding the pulses of said ultraviolet radiation with a frequency of 10 to 15 Hertz.
Claim 19
Dependent Claim
26 words
A method as claimed in claim 9, which comprises focusing said ultraviolet radiation on the surface of the cornea into a spot 5 mm in diameter.
Claim 20
Independent Claim
109 words
A method for correcting ocular refraction anomalies, which comprises feeding to the eye surface of pulsed ultraviolet radiation, 223 nm wavelength, 600 to 1200 mJ/cm 2 energy density, 5 to 50 ns pulse length with frequency recurrence of 5 to 25 Hertz and the pulse shape close to rectangular, simultaneously ensuring axisymmetrical distribution on the cornea surface of said ultraviolet radiation whose exposition varies from the center of the area of the effect of said ultraviolet radiation toward its periphery, focusing said ultraviolet radiation on the surface of the cornea into a spot and evaporating in lamellae the cornea until a desired correction of ocular refraction anomalies is obtained.
Claim 21
Independent Claim
109 words
A method for correcting ocular refraction anomalies, which comprises feeding to the eye surface of pulsed ultraviolet radiation, 223 nm wavelength, 600 to 1200 mJ/cm 2 energy density, 5 to 50 ns pulse length with frequency recurrence of 5 to 25 Hertz and the pulse shape close to rectangular, simultaneously ensuring axisymmetrical distribution on the cornea surface of said ultraviolet radiation whose exposition varies from the center of the area of the effect of said ultraviolet radiation toward its periphery, focusing said ultraviolet radiation on the surface of the cornea into a spot and evaporating in lamellae the cornea until a desired correction of ocular refraction anomalies is obtained.
Claim 22
Dependent Claim
19 words
A method as claimed in claim 19, which comprises feeding up to 10 4 pulses of said ultraviolet radiation.
Claim 23
Dependent Claim
27 words
A method as claimed in claim 19 or 20, which comprises taking the density of energy of said ultraviolet radiation from 600 to 900 mJ/cm 2 .
Claim 24
Dependent Claim
25 words
A method as claimed in claim 19 or 20, which comprises feeding pulses of said ultraviolet radiation with a frequency of 10 to 15 Hertz.
Claim 25
Dependent Claim
22 words
A method as claimed in claim 19 or 20, which comprises focusing said ultraviolet radiation into a spot 5 mm in diameter.
Claim 26
Dependent Claim
23 words
A method as claimed in claim 21, which comprises feeding pulses of said ultraviolet radiation with a frequency of 10 to 15 Hertz.
Claim 27
Dependent Claim
20 words
A method as claimed in claim 24, which comprises focusing said ultraviolet radiation into a spot 5 mm in diameter.
Claim 28
Independent Claim
184 words
A device for correcting ocular refraction anomalies, comprising: an ultraviolet pulsed laser operating at a wavelength of 223 nm; a uniform light beam former optically connected with said pulsed laser; a slotted mask optically connected with said uniform light beam former from which a uniform light beam is projected on said slotted mask and having at least two slots, each of which is shaped as a lobe; a drive for rotating said slotted mask providing for uniform axisymmetric distribution of ultraviolet radiation over the exposed surface of the cornea; a means for forming an image of said slotted mask on the corneal surface, said means for forming the image on the corneal surface, positioned at the same optical axis with said slotted mask and having an optical outlet; a unit to monitor energy density of ultraviolet radiation incident on the corneal surface arranged at said optical outlet of said means for forming the image; a microscope to observe the emission of ultraviolet radiation to the surface of the cornea and the correction process, said microscope being optically connected with said slotted mask image former.
Claim 29
Independent Claim
184 words
A device for correcting ocular refraction anomalies, comprising: an ultraviolet pulsed laser operating at a wavelength of 223 nm; a uniform light beam former optically connected with said pulsed laser; a slotted mask optically connected with said uniform light beam former from which a uniform light beam is projected on said slotted mask and having at least two slots, each of which is shaped as a lobe; a drive for rotating said slotted mask providing for uniform axisymmetric distribution of ultraviolet radiation over the exposed surface of the cornea; a means for forming an image of said slotted mask on the corneal surface, said means for forming the image on the corneal surface, positioned at the same optical axis with said slotted mask and having an optical outlet; a unit to monitor energy density of ultraviolet radiation incident on the corneal surface arranged at said optical outlet of said means for forming the image; a microscope to observe the emission of ultraviolet radiation to the surface of the cornea and the correction process, said microscope being optically connected with said slotted mask image former.
Claim 30
Dependent Claim
103 words
A device as claimed in claim 26, wherein the slotted mask comprises a substrate having a surface opaque to ultraviolet radiation, while all the slots are shaped as lobes transparent to ultraviolet radiation, the interface between the opaque surface of the substrate and each transparent lobe being defined as ##EQU3## where n is the number of lobes in the slotted mask, m is the ordinal number of a respective lobe of the slotted mask, r o is the length of the lobe, r is radial coordinate of the boundary of each lobe, φ is angular coordinate of the boundary of each lobe, 1≦m≦n.
Claim 31
Dependent Claim
100 words
A device as claimed in claim 26, wherein the slotted mask comprises a substrate having a surface transparent to ultraviolet radiation, while all the lobes are opaque to ultraviolet radiation, the interface between the transparent surface of the substrate and each opaque lobe being defined as ##EQU4## wherein n is the number of lobes of the slotted mask, m is the ordinal number of a respective lobe of the slotted mask, r o is the length of the lobe, r is radial coordinate of the boundary of each lobe, φ is angular coordinate of the boundary of each lobe, 1≦m≦n.
Claim 32
Independent Claim
28 words
A device as claimed in any of the preceding claims from 26 to 28, wherein the number of slots in the slotted mask varies from two to six.
References Cited (Backward Citations)
US4669837A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |