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Updated: May 11, 2026
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Environmental Dynamic Mechanical Analysis to Predict the Softening Behavior of Neural Implants
Published on: March 1, 2019
Thiol-ene/acrylate substrates for softening intracortical electrodes
Taylor Ware1, Dustin Simon, Clive Liu
1The University of Texas at Dallas, Department of Materials Science and Engineering, Richardson, Texas.
Summary
Researchers developed new neural recording electrode substrates that soften upon insertion into the brain. This innovation improves chronic signal recording by reducing mechanical mismatch with neural tissue.
Area of Science:
- Biomaterials Science
- Neuroscience Engineering
- Polymer Chemistry
Background:
- Neural interfaces traditionally use rigid substrates, creating a mechanical mismatch with compliant neural tissue.
- This mismatch can lead to adverse tissue responses, limiting long-term performance of neural recording and stimulation devices.
- Developing compliant substrates is crucial for improving chronic neural interface functionality.
Purpose of the Study:
- To create novel softening substrates for neural recording electrodes using advanced polymer networks.
- To investigate the thermomechanical properties and physiological response of these new substrate materials.
- To demonstrate the efficacy of electrodes fabricated on these substrates for long-term neural activity recording.
Main Methods:
- Fabrication of neural recording electrode substrates using novel ternary thiol-ene/acrylate polymer networks.
- Characterization of thermomechanical properties via differential scanning calorimetry and dynamic mechanical analysis before and after physiological exposure.
- Fabrication and implantation of intracortical electrodes on the softening substrates for neural recording.
Main Results:
- The substrate system exhibits significant softening, decreasing from over 1 GPa to 18 MPa upon exposure to physiological conditions (body temperature, <3% fluid uptake).
- Electrodes (177 µm(2) gold with platinum black) on these substrates show an impedance of 206 kΩ at 1 kHz.
- Intracortical electrodes successfully recorded driven neural activity for 4 weeks, demonstrating chronic performance.
Conclusions:
- This work presents the first substrate system compatible with photolithography that softens in response to physiological conditions.
- The developed softening substrates significantly reduce the mechanical mismatch between neural interfaces and brain tissue.
- The novel substrate system enables robust, long-term neural recording, paving the way for improved neural interface technologies.
