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Restoring visual perception using microsystem technologies: engineering and manufacturing perspectives.

I Krisch1, B J Hosticka

  • 1Fraunhofer Institute of Microelectronic Circuits and Systems, Duisburg, Germany.

Acta Neurochirurgica. Supplement
|August 19, 2007
PubMed
Summary
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This study presents an epiretinal prosthesis using microsystem technology to restore vision for patients with retinitis pigmentosa or macular degeneration. The implantable device electrically stimulates nerve cells, demonstrating retinotopic activation in vivo.

Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Microsystems Technology

Background:

  • Microsystem technologies enable advanced, fully implantable neural prostheses.
  • Intelligent prostheses require interdisciplinary collaboration between physicians, engineers, and scientists.

Purpose of the Study:

  • To detail the design and development of an epiretinal prosthesis for visual restoration.
  • To address challenges in system design, data/power transfer, fabrication, encapsulation, and testing of visual prostheses.

Main Methods:

  • Development of an implantable micro-electro-stimulator powered wirelessly.
  • Assembly of microelectronic circuits on flexible substrates with electrode arrays.
  • Encapsulation of the implant using parylene C and silicone rubber.

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Main Results:

  • Successful wireless inductive power and data transfer demonstrated.
  • In vivo experiments confirmed retinotopic activation of the visual cortex.
  • The epiretinal implant system shows promise for restoring vision.

Conclusions:

  • Epiretinal prostheses are viable solutions for bypassing neural defects in blindness.
  • Microsystem technology is crucial for creating compact and functional visual implants.
  • This implantable visual prosthesis aids patients with retinitis pigmentosa and macular degeneration.