High‐Frequency Stimulation of Normal and Blind Mouse Retinas Using TiO2 Nanotubes. (16th October 2018)

• Record Type: Journal Article
• Authors: Ronzani, Carole; Cottineau, Thomas; Gonzalez‐Valls, Irene; Keller, Valérie; Picaud, Serge; Keller, Nicolas; Roux, Michel Joseph
• Is Part Of: Advanced functional materials. Volume 28:Number 50(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-10-16
• Subjects: artificial retina -- light sensor -- neuronal stimulation -- photoactive materials -- TiO2 nanotubes; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201804639
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: With three models in commercial use, artificial retinas are the most concrete hope to restore sight to blind patients, notably those affected with retinitis pigmentosa. However, present architectures are costly to produce, while the restored visual acuity remains below the legal threshold for blindness. Furthermore, the complexity of current systems with tethered application‐specific integrated circuits (asics) requires complex surgeries, with risks of complications and failures. In the search for new nanomaterials, it is demonstrated that, when placed in contact with photoreceptors (control mouse retinas) or directly with bipolar cells (rhodopsin P23H mouse retinas, a model of retinitis pigmentosa), films of vertically aligned anatase titanium dioxide (TiO2 ) nanotubes can drive the activity of the retinal network for stimulation frequencies up to the video rate (25 Hz), in response to short (5–20 ms), small (50–100 µm) light spots. Acting as continuous arrays of electrodes, these films should allow a fine tuning of prosthetic stimulations, through modulation of the spot size, duration, and precise localization over the implant surface. Abstract : When put in contact with retinas, films of vertically aligned anatase titanium dioxide (TiO2 ) nanotubes can drive the retinal network activity in a large range of frequencies (up to 25 Hz), using small (50–100 µm) and short (5–20 ms) light pulses. They can thus become the base of an efficient, low‐cost retinal prosthesis.