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Segmented detachable structure of cochlear‐implant electrodes for close‐hugging engagement with the modiolus
Author(s) -
Mirzadeh H.,
Abbasi F.
Publication year - 2003
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.20011
Subject(s) - polydimethylsiloxane , materials science , contact angle , electrode , polymer , fourier transform infrared spectroscopy , composite material , cochlear implant , modiolus (cochlea) , methacrylate , surface modification , biomedical engineering , chemical engineering , polymerization , chemistry , linguistics , philosophy , medicine , engineering
Surface and bulk modification techniques of polydimethylsiloxane (PDMS) polymers were used to develop a new intracochlear electrode that can closely hug the inner wall of scala tympani. Laser‐induced surface grafting of poly (2‐hydroxyethyl methacrylate) (PHEMA) and sequential method for preparation of interpenetrating polymer networks (IPNs) of PDMS/PHEMA were, respectively, used for surface and bulk modifications. The hydrogel content and water‐uptake capability of the modified samples were optimized by Taguchi method for experimental design. The modified PDMS samples were examined by performing attenuated total reflectance Fourier transform infrared (ATR‐FTIR) spectroscopy, water contact‐angle measurement, and peel strength tests. The performances of actual‐sized fabricated electrodes were assessed inside a transparent model of scala tympani, which was filled with saline. After a swelling process, the hydrophilic branch begins to elongate and detach from hydrophobic branch and pushes it toward the inner wall. © 2003 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 68B: 191–198, 2004