Non-invasive ocular assessment method and associated apparatus

• US 6,631,989 B2
• Filed: 08/17/2001
• Issued: 10/14/2003
• Est. Priority Date: 05/18/2001
• Status: Active Grant

• Current Assignee: West Virginia University
• Original Assignee: West Virginia University
• Inventors: Odom, James V., Smith, James E., Craven, Robert P. M.
• Primary Examiner(s): Manuel, George
• Assistant Examiner(s): SANDERS JR, JOHN R
• Application Number:
  US09/932,750
• Publication Number:
  US 20020171805A1
• Time in Patent Office: 788 Days
• Field of Search: 351/200, 351/205, 351/206, 351/209, 351/210, 351/213, 351/221, 351/246, 600/407, 600/318-321, 600/558, 180/272, 340/500, 340/576
• US Class Current: 351/205
• CPC Class Codes: A61B 3/0083 provided with means for patient positioning
• CPC Class Codes: A61B 3/1241 specially adapted for observation of ocular blood flow, e.g. by fluorescein angiography
• CPC Class Codes: A61B 3/145 by video means

Abstract

A method of monitoring a subject for medical conditions includes causing light to impinge on at least one eye of the subject, directing reflected light from such light beam to photosensors, converting the received reflected light to corresponding electrical signals which are delivered to a processor. Processing the signals by effecting a comparison between stored information regarding the medical condition and the data provided by the monitoring to determine if an undesired medical condition exists and, if so, communicating such result. The cycle is repeated at predetermined intervals which may be short or prolonged. The stored information may be information relating to the specific subject or general information regarding normal and abnormal conditions of the eye representative of toxicity. The eyes may be monitored sequentially or simultaneously. Related apparatus is provided.

Claims

1. A method of monitoring a medical condition including a toxin in a subject comprising

administering a chemical substance to said subject,

impinging light on a subject'"'"'s eye,

directing reflected light from said impinging light beam to a photosensor,

converting said reflected light into corresponding electrical signals,

delivering said electrical signals to a processor which contains stored information regarding desired parameters for the particular medical condition including a biomarker related to said toxin, and

effecting a comparison between the photosensor delivered electrical signals and the stored information to determine if an undesirable medical condition exists and if such undesirable medical condition exists communicating such event.

2. The method of claim 1 including

cyclically repeating said method.

3. The method of claim 2 including

repeating said method after a prolonged interval.

4. The method of claim 2 including

employing optics to direct said reflected light beam to said eye and employing optics to direct said reflected light to said photosensor.

5. The method of claim 4 including

filtering the reflected light emerging from said optics prior to introducing said light beam into said photosensor.

6. The method of claim 1 including

on the basis of said monitoring determining a likely toxic cause of said undesirable medical condition.

7. The method of claim 1 including

stabilizing the subject'"'"'s head to resist undesired motion thereof during said monitoring.

8. The method of claim 1 including

monitoring each eye of said subject sequentially.

9. The method of claim 1 including

monitoring both eyes of said subject substantially simultaneously.

10. The method of claim 1 including

employing as said stored information average data relating to a medical condition as related to the general population.

11. The method of claim 1 including

employing as said stored information data with respect to said toxin obtained from said subject.

12. The method of claim 1 including

effecting said monitoring by employing as said stored information a set of heuristic rules developed from database information related to said medical condition.

13. A method of monitoring a medical condition in a subject comprising

administering a chemical substance to said subject,

impinging light on a subject'"'"'s eye,

directing reflected light from said impinging light beam to a photosensor,

converting said reflected light into corresponding electrical signals,

delivering said electrical signals to a processor which contains stored information regarding desired parameters for the particular medical condition,

effecting a comparison between the photosensor delivered electrical signals and the stored information to determine if an undesirable medical condition exists and if such undesirable medical condition exists communicating such event,

employing a toxin sensitive chemical substance as said chemical substance, and

administering said toxin sensitive chemical substance by injection.

14. A method of monitoring a medical condition in a subject comprising

administering a chemical substance to said subject,

impinging light on a subject'"'"'s eye,

directing reflected light from said impinging light beam to a photosensor,

converting said reflected light into corresponding electrical signals,

delivering said electrical signals to a processor which contains stored information regarding desired parameters for the particular medical condition,

effecting a comparison between the photosensor delivered electrical signals and the stored information to determine if an undesirable medical condition exists and if such undesirable medical condition exists communicating such event,

employing a toxin sensitive chemical substance as said chemical substance, and

administering said toxin sensitive chemical substance topically to the surface of the eye or its surrounding tissues.

15. A method of monitoring a medical condition in a subject comprising

administering a chemical substance to said subject,

impinging light on a subject'"'"'s eye,

directing reflected light from said impinging light beam to a photosensor,

converting said reflected light into corresponding electrical signals,

delivering said electrical signals to a processor which contains stored information regarding desired parameters for the particular medical condition,

effecting a comparison between the photosensor delivered electrical signals and the stored information to determine if an undesirable medical condition exists and if such undesirable medical condition exists communicating such event,

on the basis of said monitoring determining a likely toxic cause of said undesirable medical condition,

employing a toxin-sensitive chemical substance as said chemical substance, and

said toxin sensitive chemical substance responsive to the existence of a predetermined level of said toxin will effect a visually perceptible change in the eye so as to permit said determination to be made.

16. A method of monitoring a medical condition in a subject comprising

administering a chemical substance to said subject,

impinging light on a subject'"'"'s eye,

directing reflected light from said impinging light beam to a photosensor,

converting said reflected light into corresponding electrical signals,

delivering said electrical signals to a processor which contains stored information regarding desired parameters for the particular medical condition,

effecting a comparison between the photosensor delivered electrical signals and the stored information to determine if an undesirable medical condition exists and if such undesirable medical condition exists communicating such event, and

employing fluorescein as said chemical substance.

17. Apparatus for monitoring a medical condition including a toxin in a subject comprising

a light source for directing light onto at least one eye of said subject,

sensor means for receiving reflected light from said eye and converting said light into corresponding electrical signals,

a processor for receiving said electrical signals,

said processor having stored information regarding desired parameters of said medical condition including a biomarker related to said toxin, and

said processor having the capability of effecting a comparison of information obtained from said electric signals with said stored information and emitting a determination of said comparison as to whether said medical condition exists or not.

18. The apparatus of claim 17 including

said processor having controls for cyclically repeating said monitoring at predetermined intervals.

19. The apparatus of claim 18 including

said processor having the capability of repeating said process at prolonged intervals.

20. The apparatus of claim 17 including

employing as said stored information information previously obtained from said subject.

21. The apparatus of claim 17 including

employing as said stored information information obtained from sources other than said subject.

22. The apparatus of claim 17 including

support for said subject'"'"'s head to resist undesired movement thereof during use of said apparatus.

24. The apparatus of claim 17 including

said apparatus being structured to monitor each eye sequentially.

25. The apparatus of claim 17 including

said apparatus being structured to monitor both eyes simultaneously.

26. The apparatus of claim 17 including

an alarm being activatable when an undesired medical condition exists through a predetermined amount of carbon monoxide being present in the subject.

27. The apparatus of claim 17 including

said stored information including information regarding normal eyes and eyes of subjects experiencing adverse consequences of toxicity.

28. The apparatus of claim 17 including

first optics for directing said light beam to said eye and second optics for directing said reflected light to said photosensors.

29. The apparatus of claim 28 including

a light filter for filtering the reflected light emerging from said second optics prior to introducing said light beam into said photosensors.

30. The apparatus of claim 17 including

said light source having a first light source for one eye and a second light source for the other eye.

31. The apparatus of claim 17 including said light source having a plurality of lights surrounding said sensor means.

32. The apparatus of claim 17 including

said light source structured to emit a light beam that is spaced from said sensor means.

23. The apparatus of clam 22 including

said support including a chin support and at least one head restraint.

33. Apparatus for monitoring a medical condition in a subject comprising

a light source for directing light onto at least one eye of said subject,

sensor means for receiving reflected light from said eye and converting said light into corresponding electrical signals,

a processor for receiving said electrical signals,

said processor having stored information regarding desired parameters of said medical condition,

said processor having the capability of effecting a comparison of information obtained from said electric signals with said stored information and emitting a determination of said comparison as to whether said medical condition exists or not, and

said stored information including information regarding toxic thresholds of at least one material selected from the group consisting of heavy metals, neurotoxins, organophosphates, fertilizers and pesticides and changes in the eye created by exceeding one more of said thresholds.

34. The apparatus of claim 33 including

said stored information including information regarding toxin sensitive chemical substances and related changes in the eye resulting from administering the same to the subject.

35. The apparatus of claim 33 including

said support supporting said light source and said sensor means.