Gekeler, Florian ; Kobuch, Karin ; Schwahn, Hartmut Normann ; Stett, Alfred 
; Shinoda, Kei ; Zrenner, Eberhart
Alternative Links zum Volltext:DOIVerlag
| Dokumentenart: | Artikel |
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| Titel eines Journals oder einer Zeitschrift: | Graefe's Archive for Clinical and Experimental Ophthalmology |
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| Verlag: | SPRINGER |
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| Ort der Veröffentlichung: | NEW YORK |
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| Band: | 242 |
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| Nummer des Zeitschriftenheftes oder des Kapitels: | 7 |
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| Seitenbereich: | S. 587-596 |
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| Datum: | 2004 |
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| Institutionen: | Medizin > Lehrstuhl für Augenheilkunde |
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| Identifikationsnummer: | | Wert | Typ |
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| 10.1007/s00417-004-0862-6 | DOI |
|
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| Stichwörter / Keywords: | REPLACE DEGENERATED PHOTORECEPTORS; LONG-TERM IMPLANTATION; VISUAL-CORTEX; ARTIFICIAL VISION; MORPHOMETRIC-ANALYSIS; CUFF ELECTRODE; INNER RETINA; BLIND; PROSTHESIS; PIGMENTOSA; |
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| Dewey-Dezimal-Klassifikation: | 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin |
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| Status: | Veröffentlicht |
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| Begutachtet: | Ja, diese Version wurde begutachtet |
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| An der Universität Regensburg entstanden: | Ja |
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| Dokumenten-ID: | 71470 |
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Web of Science
Zusammenfassung
Background: Subretinal implants intend to replace photoreceptor function in patients suffering from degenerative retinal disease by topically applying electrical stimuli from the subretinal space. This study intended to prove the feasibility of a newly developed transchoroidal surgery and, furthermore, of a subretinal electrode array, which closely resembles envisioned human implants to ...
Zusammenfassung
Background: Subretinal implants intend to replace photoreceptor function in patients suffering from degenerative retinal disease by topically applying electrical stimuli from the subretinal space. This study intended to prove the feasibility of a newly developed transchoroidal surgery and, furthermore, of a subretinal electrode array, which closely resembles envisioned human implants to electrically stimulate the visual system in rabbits. Methods: Five rabbits (ten eyes) were implanted with a 4x2-electrode array via a transchoroidal access to the subretinal space. The electrodes were connected to an arbitrary stimulus generator to apply voltage pulses. Retinae were accessed by light microscopy after stimulation with various intensities. Results: The stimulating foil could be introduced into the subretinal space in all eyes. In seven of ten eyes electrically evoked cortical potentials following subretinal electrical stimulation could be elicited. Threshold voltages ranged from less than 0.1 to 2.38 V with a corresponding threshold charge of approximately 1.0 nC per electrode or 10 muC/cm(2). Histology revealed localized retinal damage over some of the electrodes succeeding stimulation strengths of 2 V and consistent damage over all electrodes succeeding voltages of 3 V. Conclusions: The study demonstrates the feasibility of the transchoroidal surgical access to place subretinal implants in rabbit eyes and provides proof of successful cortical activation following subretinal electrical stimulation by an electrode array envisioned for human implantations.
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