Toward a self-deploying shape memory polymer neuronal electrode.

Published

Journal Article

The widespread application of neuronal probes for chronic recording of brain activity and functional stimulation has been slow to develop partially due to long-term biocompatibility problems with existing metallic and ceramic probes and the tissue damage caused during probe insertion. Stiff probes are easily inserted into soft brain tissue but cause astrocytic scars that become insulating sheaths between electrodes and neurons. In this communication, we explore the feasibility of a new approach to the composition and implantation of chronic electrode arrays. We demonstrate that softer polymer-based probes can be inserted into the olfactory bulb of a mouse and that slow insertion of the probes reduces astrocytic scarring. We further present the development of a micromachined shape memory polymer probe, which provides a vehicle to self-deploy an electrode at suitably slow rates and which can provide sufficient force to penetrate the brain. The deployment rate and composition of shape memory polymer probes can be tailored by polymer chemistry and actuator design. We conclude that it is feasible to fabricate shape memory polymer-based electrodes that would slowly self-implant compliant conductors into the brain, and both decrease initial trauma resulting from implantation and enhance long-term biocompatibility for long-term neuronal measurement and stimulation.

Full Text

Duke Authors

Cited Authors

  • Sharp, AA; Panchawagh, HV; Ortega, A; Artale, R; Richardson-Burns, S; Finch, DS; Gall, K; Mahajan, RL; Restrepo, D

Published Date

  • December 2006

Published In

Volume / Issue

  • 3 / 4

Start / End Page

  • L23 - L30

PubMed ID

  • 17124327

Pubmed Central ID

  • 17124327

Electronic International Standard Serial Number (EISSN)

  • 1741-2552

International Standard Serial Number (ISSN)

  • 1741-2560

Digital Object Identifier (DOI)

  • 10.1088/1741-2560/3/4/l02

Language

  • eng