Results 171 to 180 of about 9,659 (210)

Minimally Invasive Retinal Prosthesis

2006 IEEE International Solid State Circuits Conference - Digest of Technical Papers, 2006
A wireless retinal implant with a low-power area-efficient stimulator chip features an ASK demodulator, single-ended-to-differential converter, low-power DLL and programmable current drivers. The chip dissipates 1.3mW from plusmn2.5V at a data rate of 100kb/s.
Luke Theogarajan, John Wyatt, Joseph Rizzo, Bill Drohan, Mariana T. Markova, Shawn K. Kelly, Greg Swider, Milan Raj, Douglas B. Shire, Marcus D. Gingerich, John Lowenstein, Barry Yomtov   +11 more
openaire   +1 more source

Image Analysis for Microelectronic Retinal Prosthesis

IEEE Transactions on Biomedical Engineering, 2008
By way of extracellular, stimulating electrodes, a microelectronic retinal prosthesis aims to render discrete, luminous spots-so-called phosphenes-in the visual field, thereby providing a phosphene image (PI) as a rudimentary remediation of profound blindness.
Luke E. Hallum, Shaun L. Cloherty, Nigel H. Lovell   +2 more
openaire   +2 more sources

Photovoltaic retinal prosthesis

SPIE Proceedings, 2011
Electronic retinal prostheses seek to restore sight to patients suffering from retinal degenerative disorders. Implanted electrode arrays apply patterned electrical stimulation to surviving retinal neurons, producing visual sensations. All current designs employ inductively coupled coils to transmit power and/or data to the implant.
James Loudin, Keith Mathieson, Ted Kamins, Lele Wang, Ludwig Galambos, Philip Huie, Alexander Sher, James Harris, Daniel Palanker   +8 more
openaire   +1 more source

Development of Retinal Prosthesis Module for Fully Implantable Retinal Prosthesis

2010
To restore visual sensation of blind patients, we have proposed a fully implantable retinal prosthesis comprising an three dimensionally (3D) stacked retinal chip for transforming optical signal to electrical signal, a flexible cable with stimulus electrode array for stimulating retina cells, and coupling coils for power transmission. For realizing the
Kangwook Lee, Tetsu Tanaka
openaire   +1 more source

Intraocular retinal prosthesis

IEEE Engineering in Medicine and Biology Magazine, 2006
Retinal prostheses have the potential to restore some level of visual function to blind individuals. While visual prosthetic devices for the optic nerve and visual cortex also have potential application, the retinal approach offers the advantage of relatively accessible retinal neurons in the back of the eye.
J.D. Weiland, M.S. Humayun
openaire   +1 more source

A Prototype Retinal Prosthesis for Visual Stimulation

2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2007
Vision loss has severe impacts on its victims, carrying with it physiological, psychological, social, and economic consequences thereby degrading the quality of life and depriving the individual from performing many of the daily living activities. This article describes the design and development of a prototype retinal prosthesis for visual stimulation.
Ziad O, Abu-Faraj, Dany M Abou, Rjeily, Rayan W, Nasreddine, Majid A, Andari, Habib H, Taok   +4 more
openaire   +2 more sources

Retinal prosthesis phosphene shape analysis

2008 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2008
A retinal prosthesis system to restore sight for the blind is under development. The system is analogous to cochlear implants, in which photoreceptor input is bypassed and replaced by direct electrical stimulation of the retinal ganglion cells. Currently, six test subjects have been implanted with a 4x4 electrode array and stimulator.
D, Nanduri, M S, Humayun, R J, Greenberg, M J, McMahon, J D, Weiland   +4 more
openaire   +2 more sources

Feasibility of extraocular stimulation for a retinal prosthesis

Canadian Journal of Ophthalmology, 2005
We present a new approach to developing a retinal prosthesis for blind patients based on extraocular stimulation of the eye with disc electrodes.Experiments to assess the feasibility of using extraocular stimulation in a retinal prosthesis were carried out in anaesthetised adult cats (n=6).
Vivek, Chowdhury, John W, Morley, Minas T, Coroneo   +2 more
openaire   +2 more sources

Epi-retinal prosthesis

2004
Retinitis pigmentosa (RP) and age-related macula degeneration (AMD) lead to the degeneration of photoreceptors, resulting in a significant visual deficit for the afflicted individual [1]. Research is proceeding to investigate the feasibility of replacing the function of the photoreceptors with an electronic device [2, 3].
Eugene de Juan, J. D. Weiland, M. S. Humayun, G. Y. Fujii   +3 more
openaire   +1 more source

Flexible microelectrode array for retinal prosthesis

2017 39th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 2017
fMEA (flexible microelectrode array) is one of the key implantable components for neural stimulating and recording. For its specific implanted environment, it should be designed and fabricated to meet following requirements such as biocompatibility, high-resolution, flexible and low impedance to ensure safety and long-term effective stimulation.
Bin Sun 0011, Tengyue Li, Kai Xia, Qi Zeng 0002, Tianzhun Wu, Mark S. Humayun   +5 more
openaire   +2 more sources