Abstract
The C-Sight visual prosthesis is based on optical nerve stimulation with a penetrating electrode array. A silicon-based microprobe by MEMS process techniques and Pt–Ir microwire arrays by electrochemical etching were fabricated in our project. Noise and impedance analyses were applied to optimize the electrode configuration. A multichannel microcurrent neural electrical stimulator and an implantable CMOS-based micro-camera were developed for neural stimulation and image acquisition, respectively, with a DSP-based system processing the captured image. Electrical evoked potentials (EEPs) from rabbit models were recorded using multichannel stainless-steel screws mounted on the primary visual cortex. The mean charge threshold density was 20.99 ± 5.52 μC/cm2 considering the exposed surface of the stimulating electrode. Current threshold decreased as the pulse duration of the stimulus increased while the corresponding charge threshold increased. The amplitude of P1 increased when the pulse duration increased from 0.4 to 1.0 ms while the latency of P1 changed little. Experiments also showed that different distribution maps of EEPs were elicited by different pairs of stimulating electrodes. The stimulating electrode pair along the axis of the optic nerve elicited cortical responses with much lower thresholds than that perpendicular to the axis of the optic nerve. The visual prosthesis with stimulating electrodes the penetrating into the optic nerve has been validated in animal experiments.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Koury CB (2006) Epiretinal prosthesis shows promise for blind patients. Retina Today 12
Humayun MS, Weiland JD, Fujii GY, et al. (2003) Visual perception in a blind subject with a chronic microelectronic retinal prosthesis. Vision Res 43:2573–2581
Chow AY, Chow VY, Packo KH, et al. (2004) The artificial silicon retina microchip for the treatment of vision loss from retinitis pigmentosa. Arch Ophthalmol 122:460–469
Chow AY, Pardue M, Chow VY, et al. (2001) Implantation of silicon chip microphotodiode arrays into the cat subretinal space. IEEE Trans Neural Syst Rehabil Eng 9:86–95
Kanda H, Morimoto T, Fujikado T, et al. (2004) Electrophysiological studies of the feasibility of suprachoroidal-transretinal stimulation for artificial vision in normal and RCS rats. Invest Ophthalmol Vis Sci 45:560–566
Troyk P, Bak M, Berg J, et al. (2003) A model for intracortical visual prosthesis research. Artif Organs 27:1005–1015
Brindley GS, Lewin WS (1968) The sensations produced by electrical stimulation of the visual cortex. J Physiol 196:479–493
Delbeke J Oozeer M, Claude V (2003) Position, size and luminosity of phosphenes generated by direct optic nerve stimulation. Vision Res 43:1091–1102
Veraart C, Raftopoulos C, Mortimer JT, et al. (1998) Visual sensations produced by optic nerve stimulation using an implanted self-sizing spiral cuff electrode. Brain Res 813:181–186
Maynard EM (2001) Visual prostheses. Annu Rev Biomed Eng 3:145–168
Yu W, Tian Y, Chai X, et al. (2006) Image processing strategies dedicated to the optic nerve stimulation. 2006 International Symposium on Biophotonics Nanophotonics and Metamaterials 147–150
Merrill DR, Bikson M, Jefferys JGR (2004) Electrical stimulation of excitable tissue: design of efficacious and safe protocols. J Neurosci Methods 141:171–198
Sui X, Pei W, Zhang R, et al. (2006) A micromachined SiO2/Silicon probe for neural signal recordings. Chinese Phys Lett 23:1932–1934
Sui X, Zhang R, Pei W, et al. (2007) A novel implantable multichannel silicon-based microelectrode. Chinese Phys 16:2116–2119
Normann RA, Maynard EM, Rousche PJ, et al. (1999) A neural interface for a cortical vision prosthesis. Vision Res 39:2577–2587
Margalit E, Maia M, Weiland JD, et al. (2002) Retinal prosthesis for the blind. Surv Ophthalmol 47:335–356
Veraart C, et al. (1998) Visual sensations produced by optic nerve stimulation using an implanted self-sizing spiral cuff electrode. Brain Res 813:181–186
Brelén ME, Duret F, Gérard B, et al. (2005) Creating a meaningful visual perception in blind volunteers by optic nerve stimulation. J Neural Eng 2:22–28
Sivaprakasam M, Liu W, Humayun MS, et al. (2005) A Variable Range Bi-Phasic Current Stimulus Driver Circuitry for an Implantable Retinal Prosthetic Device. IEEE J Solid-State Circuits 40:763–771
Stiles NR (2004) Intraocular camera for retinal prostheses: Restoring vision to the blind California State Science Fair, S0322.
Yang X, Zhou C (2000) Analysis of the complexity of remote sensing image and its role on image classification. IEEE Int Geosci Remote Sens Symp 5:2179–2181
Zheng G, Cai Z (2005) Two Dimensional Pattern Complexity. J Fudan Univ 44:332–337
Gonzalez RC, Woods RE (1992) Digital Image Processing. Addison-Wesley Publishing Company, New Jersey
Cha K, Horch KW, Normann RA, et al. (1992) Reading speed with a pixelized vision system. J Opt Soc Am A 9:673–677
Dagnelie G, Thompson RW, Barnett GD, et al. (2000) Visual perception and performance under conditions simulating prosthetic vision. Perception. 29 (suppl.). 84(abstract)
Thompson RW, Barnett GD, Humayun MS, et al. (2000) Reading speed and facial recognition using simulated prosthetic Pixelized vision. Invest Ophthalmol Vis Sci 44:5035–5042
Humayun MS (2001) Intraocular retinal prosthesis. Trans Am Ophthalmol Soc 99:271–300
Thompson RW, Barnett GD, Humayun MS, et al. (2003) Facial recognition using simulated prosthetic pixelized vision. Invest Ophthalmol Vis Sci 44:5035–5042
Hayes JS, Yin VT, Piyathaisere D, et al. (2003) Visually guided performance of simple tasks using simulated prosthetic vision. Artif Organs 27:1016–1028
Dagnelie G, Keane P, Narla V, et al. (2007) Real and virtual mobility performance in simulated prosthetic vision. J Neural Eng 4:92–101
Chai X, Yu W, Wang J, et al. (2007a) Recognition of pixelized chinese characters using simulated prosthetic vision. Artif Organs 31:175–182
Chai X, Zhang L, et al. (2007b) Study of tactile perception based on phosphene positioning using simulated prosthetic vision. Artif Organs 32:110–115
Acknowledgments
This research is supported by the National Basic Research Program of China (973 Program, 2005CB724302), National Science Fund for Distinguished Young Scholars from The National Natural Science Foundation of China (60588101), the National Natural Science Foundation of China (60871091), National Natural Science Foundation of China for the Youth (30700217), Shanghai Pujiang Program (07PJ14050), the 111 Project from the Ministry of Education of China (B08020).
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2009 Springer Science+Business Media, LLC
About this chapter
Cite this chapter
Sui, X. et al. (2009). Visual Prosthesis for Optic Nerve Stimulation. In: Greenbaum, E., Zhou, D. (eds) Implantable Neural Prostheses 1. Biological and Medical Physics, Biomedical Engineering. Springer, New York, NY. https://doi.org/10.1007/978-0-387-77261-5_2
Download citation
DOI: https://doi.org/10.1007/978-0-387-77261-5_2
Published:
Publisher Name: Springer, New York, NY
Print ISBN: 978-0-387-77260-8
Online ISBN: 978-0-387-77261-5
eBook Packages: EngineeringEngineering (R0)