fa Flexible Electrode Array for Retinal Stimulation مخابرات Communication پژوهشي Research <p dir="ltr">In this Work, ITO/PET (Indium Tin Oxide / Polyethylene Terephthalate) electrode structure which provides biocompatibility, mechanical stability and flexibility is fabricated. Flexible ITO/PET implantable electrode array for a retina has been developed. The electrode array is fabricated on a thin PET/ITO substrate and is encapsulated using, SU-8, an insulating material. PET substrate and SU-8 polymer make electrodes flexible so that they could shape to contoured tissues. A layer of gold on the stimulation sites serves to reduce the electrode/tissue interface impedance. Prototypes of 4&times;4 and 12&times;6 electrode arrays are fabricated for primary and dense configuration of retina prosthesis respectively. The exposed electrode diameters are 125&mu;m for primary and 100&mu;m for dense micro electrode array. The stimulation sites of primary configuration were connected via 50&mu;m interconnects with 50&mu;m spacing. 40&micro;m width traces with 15 &micro;m spacing connect sites to bonding pads in the other design. To verify the functionality of the micro fabricated electrodes, the electrochemical impedance spectroscopy is measured. The electrode/tissue impedance was 19.4K&Omega; at 1 KHz for 7854&mu;m² area.</p> <p>In this Work, ITO/PET (Indium Tin Oxide / Polyethylene Terephthalate) electrode structure which provides biocompatibility, mechanical stability and flexibility is fabricated. Flexible ITO/PET implantable electrode array for a retina has been developed. The electrode array is fabricated on a thin PET/ITO substrate and is encapsulated using, SU-8, an insulating material. PET substrate and SU-8 polymer make electrodes flexible so that they could shape to contoured tissues. A layer of gold on the stimulation sites serves to reduce the electrode/tissue interface impedance. Prototypes of 4&times;4 and 12&times;6 electrode arrays are fabricated for primary and dense configuration of retina prosthesis respectively. The exposed electrode diameters are 125&mu;m for primary and 100&mu;m for dense micro electrode array. The stimulation sites of primary configuration were connected via 50&mu;m interconnects with 50&mu;m spacing. 40&micro;m width traces with 15 &micro;m spacing connect sites to bonding pads in the other design. To verify the functionality of the micro fabricated electrodes, the electrochemical impedance spectroscopy is measured. The electrode/tissue impedance was 19.4K&Omega; at 1 KHz for 7854&mu;m² area.</p> Retinal Prosthesis, Microelectrode Array, Stimulation Site, Flexibility, Biocompatibility, ITO/PET substrate, SU-8. Retinal Prosthesis, Microelectrode Array, Stimulation Site, Flexibility, Biocompatibility, ITO/PET substrate, SU-8. 111 116 http://jiaeee.com/browse.php?a_code=A-10-1-65&slc_lang=fa&sid=1 Laila Saadatifard Laila Saadatifard 1003194753284600263 1003194753284600263 Yes Farhad Akbari Boroumand Farhad Akbari Boroumand 1003194753284600264 1003194753284600264 No Amir Masoud Sodagar Amir Masoud Sodagar 1003194753284600265 1003194753284600265 No