An Optically Powered Single-Channel Stimulation Implant as Test System for Chronic Biocompatibility and Biostability of Miniaturized Retinal Vision Prostheses
| Autor: | S. Kammer, L. Hesse, Thomas Doerge, A. Rentzos, N. Greve, Thomas Stieglitz, C. Lau, Thomas Schanze, Werner Haberer |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Optics and Photonics
Materials science Biocompatibility Vision Disorders Biomedical Engineering Biocompatible Materials Electric Stimulation Therapy Prosthesis Design Retina Microsystem Animals Lenses Intraocular Neural Prosthesis Foreign-Body Reaction Prostheses and Implants Electric Stimulation Electrodes Implanted Equipment Failure Analysis Surface micromachining Microelectrode Visual prosthesis visual_art Electronic component Cats visual_art.visual_art_medium Feasibility Studies Implant Microelectrodes Biomedical engineering |
| Zdroj: | IEEE Transactions on Biomedical Engineering. 54:983-992 |
| ISSN: | 1558-2531 0018-9294 |
| DOI: | 10.1109/tbme.2007.895866 |
| Popis: | A microsystem based microimplant with an optically powered single-channel stimulator was designed and developed as test system for an epi-retinal vision implant. Biostability of the hybrid assembly and the encapsulation materials were evaluated in pilot experiments in chronic implantations in a cat animal model. The implant was fabricated on a flexible polyimide substrate with integrated platinum electrode, interconnection lines, and contact pads for hybrid integration of electronic components. The receiver part was realized with four photodiodes connected in series. A parylene C coating was deposited on the electronic components as insulation layer. Silicone rubber was used to encapsulate the electronics in the shape of an artificial intraocular lens to allow proper implantation in the eye. Pilot experiments showed the biostability of the encapsulation approach and full electric functionality of the microimplant to generate stimulation currents over the implantation period of three months in two cats. In one cat, electrical stimulation of the retina evoked neuronal responses in the visual cortex and indicated the feasibility of the system approach for chronic use. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|