US4476878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blood velocity measurement in retinal capillaries utilizing the blue field entoptic phenomenon
Assignee: Individual
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Filing: 1983-09-16
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Granted: 1984-10-16
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Expires: 2003-09-16
Abstract
Abstract A method for determining the speed of leukocytes in retinal capillaries comprises the steps of simulating, by means of a minicomputer system which includes a visual display, the motion of entoptically seen leukocytes in retinal capillaries; observing entoptically the motion of actual leukocytes in the retinal capillaries of the subject's own eye; and comparing the appearances and motions of the visual display and the actual leukocytes. Apparatus for performing such a method comprises a minicomputer, a graphic display, and a display-processor interface.
Inventors
- 👤 Charles E. Riva
- 👤 L. Benno Petrig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:07
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/36; A; A61; A61B; A61B3/00; A61B3/10; A61B3/12; A61B3/1241; G01P5/00; G01P5/18; G01P5/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
53 words
Apparatus for use in conjunction with an entoptoscope to determine the speed of leukocytes in retinal capillaries, comprising means for producing a visual display which simulates the appearance of entoptically seen leukocytes, said means for producing a visual display having selectively adjustable controls for adjusting the speed and number of the simulated leukocytes.
Claim 2
Dependent Claim
53 words
Apparatus for use in conjunction with an entoptoscope to determine the speed of leukocytes in retinal capillaries, comprising means for producing a visual display which simulates the appearance of entoptically seen leukocytes, said means for producing a visual display having selectively adjustable controls for adjusting the speed and number of the simulated leukocytes.
Claim 3
Dependent Claim
24 words
Apparatus in accordance with claim 1, wherein said selectively adjustable controls include means for adjusting the maximum and minimum speeds of the simulated leukocytes.
Claim 4
Dependent Claim
54 words
Apparatus in accordance with claim 1, including means for sensing the blood pressure wave of a subject, and means for operatively interconnecting the output of said sensing means and said means for producing a visual display so that said means for producing a visual display provides simulated leukocytes, the motion of which is pulsatile.
Claim 5
Dependent Claim
24 words
Apparatus in accordance with claim 3, wherein said selectively adjustable controls include means for adjusting the maximum and minimum speeds of the simulated leukocytes.
Claim 6
Dependent Claim
38 words
Apparatus in accordance with claim 1, wherein said means for producing a visual display comprises a cathode ray tube display, digital computer means, and a display processor providing an interface between said digital computer means and said display.
Claim 7
Dependent Claim
45 words
Apparatus in accordance with claim 5, including selectively operable means operatively coupled to said digital computer means, said selectively operable means being operable by a subject to signal visual correspondence between said visual display and the entoptically seen leukocytes in retinal capillaries of the subject.
Claim 8
Dependent Claim
18 words
Apparatus in accordance with claim 1, and means for observing the display in a background of blue light.
Claim 9
Dependent Claim
33 words
Apparatus in accordance with claim 7, said means for observing the display comprising a source of blue light and a bean splitter for adding the blue light to the light of the display.
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) | 1987-10-16 | 1988-04-16 | 1988-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-16 | 1992-04-16 | 1992-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-16 | 1996-04-16 | 1996-10-16 | $7700.00 | Window Closed / Lapsed |