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Ultrafast resorbing polymers for use as carriers for cortical neural probes

Paper ID Volume ID Publish Year Pages File Format Full-Text
1355 82 2011 9 PDF Available
Title
Ultrafast resorbing polymers for use as carriers for cortical neural probes
Abstract

We have identified a polymeric system based on a novel tyrosine-derived terpolymer that offers desirable insertion capability for flexible neural prosthetic devices. To test this concept, flexible films were coated with this terpolymer and their suitability for peranchyma insertion was visualized. The effect of the polymer on neural recording was evaluated using coated microwire probes. The stiff but readily resorbable polymer rapidly degrades (molecular weight half-life of 170 min) while turning into a soft gel, followed by complete resorption within 240 min. This polymeric platform maintains sufficient stiffness to facilitate pial penetration with a dry elastic modulus of 393 ± 44 MPa but loses its strength within 30 min once immersed in saline. In vitro, the polymer’s ability to locally deliver dexamethasone has been confirmed through a first order release profile over a 360 min period. In vitro, coated microwire probes regained their original impedance values of 0.5 KΩ within 20 min of wetting via water absorption and polymer resorption. In vivo, the retention of electrical recording capability was also demonstrated through multiple waveform detection in live animals. The ultrafast resorbing polymer as a platform to facilitate the implantation of micronized flexible probes can be utilized in future designs of chronic neural devices.

Keywords
Biodegradable polymer; Neural probe; Carrier; Resorption; Dexamethasone
First Page Preview
Ultrafast resorbing polymers for use as carriers for cortical neural probes
Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 7, Issue 6, June 2011, Pages 2483–2491
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering