Measuring the electric field of bioelectrodes in saline during stimulation.
In order to provide effective vision in a retinal prosthesis, it is necessary to provide sufficient phosphene quantities ideally by parallel stimulation of multiple electrodes. A common, limiting factor in parallel stimulation is the occurrence of cross talk, which can cause undesired tissue stimulation leading to inconsistent percepts. In this paper we present a system developed for measuring the electric field in an in vitro environment by stimulation of bioelectrodes immersed in an electrolyte. The results from this study provides a better understanding of the electric field generated by stimulating electrodes. Calculation of activation area can provide useful information in regards to electrode separation to eliminate cross talk during parallel stimulation.
Graduate School of Biomedical Engineering, University of New South Wales, Sydney, NSW 2052, Australia.
Umar
U
Ansari
Nigel H
NH
Lovell
Gregg J
GJ
Suaning
D004558:Electric Stimulation; D055664:Electrochemical Techniques; D006801:Humans; D058542:Implantable Neurostimulators; D008839:Microelectrodes / Q000706:statistics & numerical data; D008959:Models, Neurological; D011474:Prosthesis Design; D012965:Sodium Chloride; D057488:Visual Prosthesis
D012965:Sodium Chloride