Abstract
Microelectrode arrays for a stimulating retinal prosthesis were fabricated from laser etched platinum (Pt) foil encased in silicone. A total of 12 arrays were fabricated to test performance in saline. Hexagonal arrangements (N=6) with multiple (6) return electrodes, as well as paired electrodes (N=6) with single returns were constructed. Electron microscopy of the electrode's surfaces was performed. Cyclic voltammetry was performed on all electrodes to measure the real surface area. The electrodes were submerged in saline in an incubator and biphasic pulses of ±162 μA and ±280 μA for 400 μs were applied at a rate of 67.1 Hz for 12 weeks. Microscopy and cyclic voltammetry were repeated and changes to the electrode's surfaces were observed both by visual inspection of the micrographs and analysis of the cyclic voltammetry curves. Extensive corrosion to those electrodes subjected to the higher current suggests a charge injection limit of less than the original 350μC/cm 2 estimate. Analysis of different corrosion levels between the hexagonal and paired arrangements show that a hexagonally arranged electrode array, with multiple return electrodes, allows a greater stimulation current to be used without reaching the charge injection limit of the electrodes.
| Original language | English |
|---|---|
| Title of host publication | 2009 4th International IEEE/EMBS Conference on Neural Engineering, NER '09 |
| Pages | 88-91 |
| Number of pages | 4 |
| DOIs | |
| Publication status | Published - 2009 |
| Externally published | Yes |
| Event | International IEEE Engineering-in-Medicine-and-Biology-Society (EMBS) Conference on Neural Engineering (NER) 2009 - Antalya, Turkey, Antalya, Turkey Duration: 29 Apr 2009 → 2 May 2009 Conference number: 4th |
Conference
| Conference | International IEEE Engineering-in-Medicine-and-Biology-Society (EMBS) Conference on Neural Engineering (NER) 2009 |
|---|---|
| Abbreviated title | NER '09 |
| Country | Turkey |
| City | Antalya |
| Period | 29/04/09 → 2/05/09 |
Keywords
- Microelectrodes
- Neural interfaces
- Neural stimulation
- Vision prosthesis
Cite this
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Performance of laser fabricated stimulating electrode arrays for a retinal prosthesis in saline. / Dodds, C. W D; Wong, Y. T.; Byrnes-Preston, P. J.; Rendl, Michael; Lovell, N H; Suaning, Gregg J.
2009 4th International IEEE/EMBS Conference on Neural Engineering, NER '09. 2009. p. 88-91 5109241.Research output: Chapter in Book/Report/Conference proceeding › Conference Paper › Research › peer-review
TY - GEN
T1 - Performance of laser fabricated stimulating electrode arrays for a retinal prosthesis in saline
AU - Dodds, C. W D
AU - Wong, Y. T.
AU - Byrnes-Preston, P. J.
AU - Rendl, Michael
AU - Lovell, N H
AU - Suaning, Gregg J.
PY - 2009
Y1 - 2009
N2 - Microelectrode arrays for a stimulating retinal prosthesis were fabricated from laser etched platinum (Pt) foil encased in silicone. A total of 12 arrays were fabricated to test performance in saline. Hexagonal arrangements (N=6) with multiple (6) return electrodes, as well as paired electrodes (N=6) with single returns were constructed. Electron microscopy of the electrode's surfaces was performed. Cyclic voltammetry was performed on all electrodes to measure the real surface area. The electrodes were submerged in saline in an incubator and biphasic pulses of ±162 μA and ±280 μA for 400 μs were applied at a rate of 67.1 Hz for 12 weeks. Microscopy and cyclic voltammetry were repeated and changes to the electrode's surfaces were observed both by visual inspection of the micrographs and analysis of the cyclic voltammetry curves. Extensive corrosion to those electrodes subjected to the higher current suggests a charge injection limit of less than the original 350μC/cm 2 estimate. Analysis of different corrosion levels between the hexagonal and paired arrangements show that a hexagonally arranged electrode array, with multiple return electrodes, allows a greater stimulation current to be used without reaching the charge injection limit of the electrodes.
AB - Microelectrode arrays for a stimulating retinal prosthesis were fabricated from laser etched platinum (Pt) foil encased in silicone. A total of 12 arrays were fabricated to test performance in saline. Hexagonal arrangements (N=6) with multiple (6) return electrodes, as well as paired electrodes (N=6) with single returns were constructed. Electron microscopy of the electrode's surfaces was performed. Cyclic voltammetry was performed on all electrodes to measure the real surface area. The electrodes were submerged in saline in an incubator and biphasic pulses of ±162 μA and ±280 μA for 400 μs were applied at a rate of 67.1 Hz for 12 weeks. Microscopy and cyclic voltammetry were repeated and changes to the electrode's surfaces were observed both by visual inspection of the micrographs and analysis of the cyclic voltammetry curves. Extensive corrosion to those electrodes subjected to the higher current suggests a charge injection limit of less than the original 350μC/cm 2 estimate. Analysis of different corrosion levels between the hexagonal and paired arrangements show that a hexagonally arranged electrode array, with multiple return electrodes, allows a greater stimulation current to be used without reaching the charge injection limit of the electrodes.
KW - Microelectrodes
KW - Neural interfaces
KW - Neural stimulation
KW - Vision prosthesis
UR - http://www.scopus.com/inward/record.url?scp=70350215751&partnerID=8YFLogxK
U2 - 10.1109/NER.2009.5109241
DO - 10.1109/NER.2009.5109241
M3 - Conference Paper
SN - 9781424420735
SP - 88
EP - 91
BT - 2009 4th International IEEE/EMBS Conference on Neural Engineering, NER '09
ER -