Monolithic Encapsulation of Implantable Neuroprosthetic Devices Using Liquid Crystal Polymers

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Flexible polymers have gained much attention in the development of low cost, magnetic resonance compatible, and non-fragile implantable medical devices. However, efficacy of the conventional polymer encapsulations containing hybrid interfaces is limited due to their relatively high moisture absorption and unstable interfacial adhesion in aqueous environments. As an alternative, we report on a monolithic encapsulation platform for neuroprosthetic devices using liquid crystal polymers (LCPs), which have a very low degree of moisture absorption (< 0.04%) and a fusion bondable interface. This platform offers monolithic encapsulation by fusion bonding of the hemispherical LCP package lids and LCP-based microelectrode arrays. The package lids were fabricated by thermoforming of the LCP films to provide the desired shape and size for encasing the electronic components and wireless telemetry coils. Fusion-bonded LCP encapsulations were evaluated using electrical leakage current measurements during in vitro soak tests. The measurements were done in both 37 degrees C and 75 degrees C phosphate-buffered saline (PBS) solution and showed that LCP encapsulation was superior and more reliable in PBS than polyimide and parylene-C encapsulations. In addition, LCP-based monolithic encapsulation provided reliable electrical insulation for more than 300 days in both 37 degrees C and 75 degrees C PBS solution.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2011-08
Language
English
Article Type
Article
Citation

IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING, v.58, no.8

ISSN
0018-9294
DOI
10.1109/TBME.2011.2136341
URI
http://hdl.handle.net/10203/305371
Appears in Collection
BC-Journal Papers(저널논문)
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