Patent US2695203A successfully refreshed from Google Patents.
Patent US4485820A successfully refreshed from Google Patents.
US4485820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for the continuous monitoring of hemoglobin saturation in the blood of premature infants
Assignee: Johns Hopkins University
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Filing: 1982-05-10
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Granted: 1984-12-04
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Expires: 2002-05-10
Abstract
Abstract A method and apparatus is disclosed for continuously monitoring hemoglobin saturation in the blood of premature infants. A substantial portion of the eye fundus is illuminated by passing at least two frequencies of light through the pupillary opening. The light scattered from the fundus is collected as it passes out through the pupillary opening and its intensity is measured. Calculations known in the art are used to determine blood hemoglobin based on the intensity of the scattered light. A contact lens with associated fiber optic links is used to illuminate the infant eye and to collect the scattered light.
Inventors
- 👤 Robert W. Flower
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:11
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/1455; A61B5/14551; A61B5/14555; A61B3/00; A61B3/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
227 words
An oximeter for continuous non-invasive monitoring of hemoglobin saturation levels in premature infants, comprising: an opaque contact means, having a concave surface adapted to fit over the globe of a patent's eye, for mounting on the eye in communication with the outer surface of the eye cornea said contact means further having a plurality of holes therethrough with openings on the concave surface; a light source capable of providing light at various frequencies; at least one transmitting fiberoptic element means mounted into one of said holes, linking said contact means to said light source, for illuminating a substantial portion of the eye fundus; at least one receiving fiberoptic element means mounted into one of said holes and terminating a predetermined distance from the concave surface of said contact means for collecting light scattered by a substantial portion of said eye fundus and for reducing the collection of cross-talk light from said at least one transmitting fiberoptic element means and light from said at least one transmitting fiberoptic element means which is backscattered by the cornea; and, a detector, processor and indicator circuit means, linked by said receiving fiberoptic element to said contact means, for measuring the intensity of light radiation scattered by said eye fundus and for calculating and indicating hemoglobin saturation based upon the intensity of said scattered light for various frequencies of said illuminating light.
Claim 2
Dependent Claim
227 words
An oximeter for continuous non-invasive monitoring of hemoglobin saturation levels in premature infants, comprising: an opaque contact means, having a concave surface adapted to fit over the globe of a patent's eye, for mounting on the eye in communication with the outer surface of the eye cornea said contact means further having a plurality of holes therethrough with openings on the concave surface; a light source capable of providing light at various frequencies; at least one transmitting fiberoptic element means mounted into one of said holes, linking said contact means to said light source, for illuminating a substantial portion of the eye fundus; at least one receiving fiberoptic element means mounted into one of said holes and terminating a predetermined distance from the concave surface of said contact means for collecting light scattered by a substantial portion of said eye fundus and for reducing the collection of cross-talk light from said at least one transmitting fiberoptic element means and light from said at least one transmitting fiberoptic element means which is backscattered by the cornea; and, a detector, processor and indicator circuit means, linked by said receiving fiberoptic element to said contact means, for measuring the intensity of light radiation scattered by said eye fundus and for calculating and indicating hemoglobin saturation based upon the intensity of said scattered light for various frequencies of said illuminating light.
Claim 3
Dependent Claim
22 words
The apparatus of claim 13 wherein said contact means is adapted to fit over at least a portion of the eye sclera.
Claim 4
Dependent Claim
40 words
The apparatus of claim 1 wherein a plurality of said at least one illuminating fiberoptic element means are mounted in an annular array of holes in said contact means; and, wherein said annular array encircles said receiving fiberoptic element means.
Claim 5
Dependent Claim
40 words
The apparatus of claim 1 wherein a plurality of said at least one receiving fiberoptic element means are mounted in an annular array of holes in said contact means; and, wherein said annular array encircles said illuminating fiberoptic element means.
Claim 6
Dependent Claim
15 words
The apparatus of claim 3 or 4 wherein said annular array is a continuous annulus.
Claim 7
Dependent Claim
244 words
An oximeter for continuous non-invasive monitoring of hemoglobin saturation levels in premature infants, comprising: an opaque contact means, having a concave surface adapted to fit over the globe of a patient's eye, for mounting on the eye in communication with the outer surface of the eye cornea said contact means further having a plurality of holes therethrough with openings on the concave surface; a light source capable of providing light at various frequencies; at least one transmitting fiberoptic element means mounted into one of said holes and, terminating a predetermined distance from the concave surface of said contact means, linking said contact means to said light source, for illuminating a substantial portion of the eye fundus; at least one receiving fiberoptic element means mounted into one of said holes and, terminating a predetermined distance from the concave surface of said contact means for collecting light scattered by a substantial portion of said eye fundus and for reducing the collection of cross-talk light from said at least one transmitting fiberoptic element means and light from said at least one transmitting fiberoptic element means which is backscattered by the cornea; and, a detector, processor and indicator circuit means, linked by said at least one receiving fiberoptic element means to said contact means, for measuring the intensity of light radiation scattered by said eye fundus and for calculating and indicating hemoglobin saturation based upon the intensity of said scattered light for various frequencies of said illuminating light.
Claim 8
Dependent Claim
244 words
An oximeter for continuous non-invasive monitoring of hemoglobin saturation levels in premature infants, comprising: an opaque contact means, having a concave surface adapted to fit over the globe of a patient's eye, for mounting on the eye in communication with the outer surface of the eye cornea said contact means further having a plurality of holes therethrough with openings on the concave surface; a light source capable of providing light at various frequencies; at least one transmitting fiberoptic element means mounted into one of said holes and, terminating a predetermined distance from the concave surface of said contact means, linking said contact means to said light source, for illuminating a substantial portion of the eye fundus; at least one receiving fiberoptic element means mounted into one of said holes and, terminating a predetermined distance from the concave surface of said contact means for collecting light scattered by a substantial portion of said eye fundus and for reducing the collection of cross-talk light from said at least one transmitting fiberoptic element means and light from said at least one transmitting fiberoptic element means which is backscattered by the cornea; and, a detector, processor and indicator circuit means, linked by said at least one receiving fiberoptic element means to said contact means, for measuring the intensity of light radiation scattered by said eye fundus and for calculating and indicating hemoglobin saturation based upon the intensity of said scattered light for various frequencies of said illuminating light.
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) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |