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First results of a study on a completely implanted retinal prosthesis in blind humans

: Koch, C.; Görtz, M.; Walter, P.; Mokwa, W.


Institute of Electrical and Electronics Engineers -IEEE-:
IEEE Sensors 2008, the Seventh IEEE Conference on Sensors : October 26-29, 2008, Lecce (Italy)
New York, NY: IEEE, 2008
ISBN: 1-4244-2581-5
ISBN: 978-1-4244-2580-8
Conference on Sensors <7, 2008, Lecce/Italien>
Conference Paper
Fraunhofer IMS ()
retinitis pigmentosa; epi-retinal; Retina-Implant

A wireless epiretinal retina implant sytem, capable of stimulating the retinal ganglion cells in blind Retinitis Pigmentosa (RP) patients, was developed. The prosthesis itself is completely implanted into the eyeball, with no cable crossing the eye's wall. Data and energy are provided by inductive coupling. The implant is based on a flexible polyimide tape with an intergrated receiver coil, stimulation electrodes and microchips. The system was implanted into six legally blind patients for four weeks. All patients reported on visual sensations, evoked by electrical stimulations of their retina. The required stimulation thresholds were found to be very low. Implantation and explantation surgery were performed without complications. The implant was well tolerated for the duration of four weeks.