Patent US4842401A successfully refreshed from Google Patents.
US4842401A
Expired / Lapsed
US
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Eye diagnosis process
Assignee: Leland Stanford Junior University
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Filing: 1987-06-15
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Granted: 1989-06-27
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Expires: 2007-06-15
Abstract
Abstract An eye examination process includes instilling a neutral pH sulforhodamine B fluorescent dye which is excitable by green light and which fluoresces with orange light in the eye of a patient. The eye is then illuminated with green light and the eye is observed, preferably through a biomicroscope, through a filter which will pass orange light and which will not transmit the wavelength of the illuminating light. This process allows observation of both the eye's tear film and devitalized epithelial cells in the eye.
Inventors
- 👤 David Maurice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:33
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/101
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
105 words
A process for eye diagnosis, which comprises instilling into the eye a solution of a fluorescent dye which is excitable with a wavelength of light longer than a wavelength of light that will cause natural fluorescence in the eye B2, exciting the fluorescent dye in the eye with a wavelength of light longer than a wavelength that will cause natural fluorescence in the eye, and observing patterns of light produced by fluorescence of the dye in the eye, the fluorescent dye being responsive to exciting light having a wavelength of at least 520 nanometers and the exciting wavelength of light being at least 520 nanometers.
Claim 2
Dependent Claim
105 words
A process for eye diagnosis, which comprises instilling into the eye a solution of a fluorescent dye which is excitable with a wavelength of light longer than a wavelength of light that will cause natural fluorescence in the eye B2, exciting the fluorescent dye in the eye with a wavelength of light longer than a wavelength that will cause natural fluorescence in the eye, and observing patterns of light produced by fluorescence of the dye in the eye, the fluorescent dye being responsive to exciting light having a wavelength of at least 520 nanometers and the exciting wavelength of light being at least 520 nanometers.
Claim 3
Dependent Claim
25 words
The process of claim 1 in which the patterns of light are produced by fluorescence of the dye in a tear film of the eye.
Claim 4
Dependent Claim
25 words
The process of claim 2 in which the patterns of light are produced by fluorescence of the dye in devitalized epithelial cells of the eye.
Claim 5
Dependent Claim
45 words
The process of claim 1 in which the patterns of light are observed through a color filter which will transmit light of a wavelength greater than the exciting light corresponding to the wavelength of the fluorescence, but which will block transmission of the exciting light.
Claim 6
Dependent Claim
16 words
The process of claim 1 in which the fluorescent dye comprises a solution of sulforhodamine B.
References Cited (Backward Citations)
US4412543A
Cited
US4533223A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |