title: Poly(vinyl alcohol)/poly(acrylic acid) hydrogel coatings for improving electrode-neural tissue interface.
abstract: A major problem which hinders the applications of neural prostheses is the inconsistent performance caused by tissue responses during long-term implantation. The study investigated a new approach for improving the electrode-neural tissue interface. Hydrogel poly(vinyl alcohol)/poly(acrylic acid) interpenetrating polymer networks (PVA/PAA IPNs) were synthesized and tailored as coatings for poly(dimethylsiloxane) (PDMS) based neural electrodes with the aid of plasma pretreatment. Changes in the electrochemical impedance and maximum charge injection (Q(inj)) limits of the coated iridium oxide microelectrodes were negligible. Protein adsorption on PDMS was reduced by approximately 85% after coating. In the presence of nerve growth factor (NGF), neurite extension of rat pheochromocytoma (PC12) cells was clearly greater on PVA/PAA IPN films than on PDMS substrates. Furthermore, the tissue responses of PDMS implants coated with PVA/PAA IPN films were studied by 6-week implantation in the cortex of rats, which found that the glial fibrillary acidic protein (GFAP) immunoreactivity in animals (n=8) receiving coated implants was significantly lower (p<0.05) compared to that of uncoated implants (n=7) along the entire distance of 150 microm from the outer skirt to the implant interface. The coated film remained on the surface of the explanted implants, confirmed by scanning electron microscopy (SEM). All of these suggest the hydrogel coating is feasible and favorable to neural electrode applications.
authors.affiliation: College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Lu
authors.forename: Dingfang
authors.initials: D
authors.lastname: Wang
authors.forename: Tao
authors.initials: T
authors.lastname: Li
authors.forename: Xueqing
authors.initials: X
authors.lastname: Zhao
authors.forename: Yuliang
authors.initials: Y
authors.lastname: Cao
authors.forename: Hanxi
authors.initials: H
authors.lastname: Yang
authors.forename: Yanwen Y
authors.initials: YY
authors.lastname: Duan
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000818:Animals; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D055664:Electrochemical Techniques; D006801:Humans; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000737:chemistry*; D020007:Implants, Experimental; D007477:Ions / Q000737:chemistry; D008297:Male; D008422:Materials Testing; D008839:Microelectrodes; D009474:Neurons / Q000166:cytology* / Q000378:metabolism; D016716:PC12 Cells; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D051381:Rats; D017207:Rats, Sprague-Dawley; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties
chemical_list: D000180:Acrylic Resins; D020099:Coated Materials, Biocompatible; D007477:Ions; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; C006903:carbopol 940; D011142:Polyvinyl Alcohol