Artificial retina

• US 5,836,996 A
• Filed: 12/30/1996
• Issued: 11/17/1998
• Est. Priority Date: 12/30/1996
• Status: Expired due to Fees

• Current Assignee: John F. Doorish
• Original Assignee: John F. Doorish
• Inventors: Doorish, John F.
• Primary Examiner(s): Jastrzab, Jeffrey R.
• Application Number:
  US08/777,075
• Time in Patent Office: 687 Days
• Field of Search: 607/53, 607/54, 607/116, 607/141, 623/4, 623/5, 128/898
• US Class Current: 623/6.63
• CPC Class Codes: A61F 9/08 Devices or methods enabling eye-patients to replace direct visual perception by another kind of perception
• CPC Class Codes: A61N 1/36046 of the eye

Abstract

The present invention is an artificial retina system that is sufficiently small so as to be fully implantable in the human eye. The artificial retina system comprises an array of artificial retinas. Each artificial retina comprises a light sensing element; an emitter element, where the emitter element is coupled to the light sensing element; and a detector element, where the detector element receives signals from the emitter element. The light sensing element intercepts light and transmits an electrical signal to the emitter element. In response to the electrical signal received from the light sensing element, the emitter element emits a signal. In response to the signal emitted by the emitter element, the detector element transmits an electrical signal to the retinal nerves. The intensity of the electrical signal sent to the retinal nerves is directly proportional to the intensity of the incoming light. In a preferred embodiment, a color filter is placed in front of the light sensing elements such that the light sensing element is limited to receiving light having wavelengths in a wavelength band corresponding to a particular color. In a preferred embodiment, each of the color filters allow passage of a different color of light such that each of the light sensing elements receives light of a different color. Also in a preferred embodiment, the artificial retina includes either a scanning tunneling microscope (STM) tip, a metal sheet, preferably made of copper, or a metal wire disposed between the detector element and the retinal nerves. Each STM tip, metal sheet or metal wire is coupled to a detector element, receives an electrical signal from the detector element and transmits an electrical signal to the retinal nerves.

Claims

1. An artificial retina for implantation in a human eye having a retina, said artificial retina comprising:

a light sensing element to sense incoming visible light having an intensity, said light sensing element producing an output signal;

an emitter element coupled to said light sensing element, wherein said emitter element senses said output signal of said light sensing element and emits an output;

a detector element, wherein said detector element senses the output of said emitter element and produces an output signal whose magnitude is proportional to the intensity of said incoming visible light; and

a coupler to couple the output signal of said detector element to the retina.

2. The artificial retina of claim 1, wherein said coupler is a scanning tunneling microscope (STM) tip.

3. The artificial retina of claim 2, wherein said STM tip comprises a cone having a tip, adapted to be disposed adjacent the retina.

4. The artificial retina of claim 1, wherein said coupler is a metal sheet disposed adjacent the retina.

5. The artificial retina of claim 4, wherein said metal is copper.

6. The artificial retina of claim 1, wherein said coupler is a wire.

7. The artificial retina of claim 1, wherein said emitter element is a light emitting element diode (LED).

8. The artificial retina of claim 7, wherein said detector element is a photodiode.

9. The artificial retina of claim 1, wherein said emitter element is an infrared (IR) emitter.

10. The artificial retina of claim 9, wherein said detector element is an IR detector.

11. The artificial retina of claim 1, wherein said emitter element is a container containing a light emitting substance.

12. The artificial retina of claim 11, wherein said detector element is a photodiode.

13. The artificial retina of claim 1, wherein said emitter element is a microlaser device.

14. The artificial retina of claim 13, wherein said detector element is an IR detector.

15. An artificial retina system for implantation into a human eye having a retina, said artificial retina system comprising:

an array of artificial retinas connected together, wherein each artificial retina comprises;

a light sensing element, wherein said light sensing element produces an output signal in response to light impinging on said light sensing element;

an emitter element, wherein said emitter element is coupled to said light sensing element, further wherein said emitter element receives the output signal of said light sensing element and produces an output in response to the output of said light sensing element;

a detector element, wherein said detector element senses the output of said emitter element and produces an output signal whose magnitude is proportional to the output of said emitter element; and

a coupler, wherein said coupler couples the output of said detector element to the retina.

16. The artificial retina system of claim 15, wherein each said artificial retina further comprises a color filter disposed in front of said light sensing element such that each said light sensing element receives light having wavelengths in a wavelength band corresponding to one color.

17. The artificial retina system of claim 16, wherein each said light sensing element is sensitive to light having wavelengths in a wavelength band corresponding to a particular color.

18. The artificial retina system of claim 16, wherein said coupler comprises a scanning tunneling microscope (STM) tip.

19. The artificial retina system of claim 18, wherein said STM tip comprises a cone having a tip adapted to be disposed adjacent the retina.

20. The artificial retina system of claim 16, wherein said coupler comprises a metal sheet.

21. The artificial retina system of claim 20, wherein said metal is copper.

22. The artificial retina system of claim 16, wherein said coupler comprises a wire.

23. The artificial retina system of claim 15, wherein said emitter element is a light emitting diode (LED).

24. The artificial retina system of claim 23, wherein said detector element is a photodiode.

25. The artificial retina system of claim 15, wherein said emitter element is an infrared (IR) emitter.

26. The artificial retina system of claim 25, wherein said detector element is a an IR detector.

27. The artificial retina system of claim 15, wherein said emitter element is a container containing a light emitting substance.

28. The artificial retina system of claim 27, wherein said detector element is a photodiode.

29. The artificial retina system of claim 15, wherein said emitter element is a microlaser device.

30. The artificial retina system of claim 29, wherein said detector element is an IR detector.

31. The artificial retina system of claim 15 further comprising a plastic housing substantially encasing said array of artificial retinas.

32. The artificial retina system of claim 15, wherein each artificial retina is substantially encased by a white opaque plastic material.