Treating retinal damage by implanting thin film optical detectors

• US 5,873,901 A
• Filed: 06/27/1996
• Issued: 02/23/1999
• Est. Priority Date: 06/30/1995
• Status: Expired due to Term

• Current Assignee: Space Vacuum Epitaxy Center University of Houston
• Original Assignee: Space Vacuum Epitaxy Center University of Houston
• Inventors: Wu, NaiJuan, Ignatiev, Alex
• Primary Examiner(s): Jastrzab, Jeffrey R.
• Application Number:
  US08/671,408
• Time in Patent Office: 971 Days
• Field of Search: 623/4, 607/53, 607/54, 607/116, 128/898
• US Class Current: 607/54
• CPC Class Codes: A61F 2/14 Eye parts, e.g. lenses, corneal implants; Implanting instruments specially adapted therefor; Artificial eyes
• CPC Class Codes: A61F 9/00727 Apparatus for retinal reattachment
• CPC Class Codes: A61N 1/0543 Retinal electrodes
• CPC Class Codes: H01L 31/032 including, apart from doping materials or other impurities, only compounds not provided for in groups H01L31/0272 - H01L31/0312
• CPC Class Codes: H01L 31/09 Devices sensitive to infrared, visible or ultraviolet radiation H01L31/101 takes precedence

Abstract

A method for treating retinal damage by implanting a thin film optical detector based on a dielectric capacitor. When illuminated, the dielectric capacitor generates an electrical field that replaces signals from damaged retinal photoreceptors in the eye. The generated electric field stimulates healthy local nerve endings and are perceived by the patient as light. In a preferred embodiment, the detectors are implanted onto the retina in groups to provide spatial resolution.

Claims

1. A method for providing electrical signals to replace signals from damaged retinal photoreceptors of a retina in an eye, comprising the steps of:

providing a dielectric capacitor-type photodetector, the photodetector comprising a front and a back electrode and a dielectric thin film sandwiched between the electrodes; and

implanting the photodetector onto the retina of the eye so as to produce electrical signals from the photodetector.

2. The method of claim 1 wherein at least one of the electrodes is made from a conducting oxide material.

3. The method of claim 2 wherein the oxide material is selected from the group of oxides consisting of LaSrCoO₃ (LSC) and YBa₂ Cu₃ O_7-x (YBCO).

4. The method of claim 1 wherein at least one of the electrodes is made of a noble metal.

5. The method of claim 1 wherein the dielectric thin film is comprised of an oxide or nitride.

6. The method of claim 5 wherein the oxide or nitride is selected from the group of oxides and nitrides consisting of PbZrTiO₃, BaSrTiO₃, BaVMnO₃, and BN.

7. The method of claim 5 wherein the dielectric film is selected to enhance visibility in a selected wave length range of light.

8. The method of claim 7 wherein the dielectric film is sensitive in the ultraviolet wavelength range.

9. The method of claim 7 wherein the dielectric film is sensitive in the infrared wavelength range.

10. The method of claim 1 wherein the front electrode includes means for anchoring the photodetector on the retina of the eye.

11. The method of claim 1 further comprising the step of implanting a plurality of photodetectors onto the retina of the eye.

12. The method of claim 11 wherein the photodetectors are implanted at locations such as to provide spatial sensitivity to the detected light.

13. The method of claim 1 wherein the photodetector has an area from about 1 sq micron to about 250,000 sq microns.