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Recording Large-scale Neuronal Ensembles with Silicon Probes in the Anesthetized Rat
Published on: October 19, 2011
SU-8 based microprobes with integrated planar electrodes for enhanced neural depth recording
Ane Altuna1, Liset Menendez de la Prida, Elisa Bellistri
1MEMS/MST Department, Ikerlan S. Coop., Mondragon, Spain. ane.altuna@ikerlan.es
Biosensors & Bioelectronics
|May 29, 2012
Summary
Researchers developed novel microprobe fabrication methods for enhanced neuronal recordings. These polymer-based probes with integrated tetrode electrodes minimize tissue gaps, enabling high-quality in vivo recordings.
Area of Science:
- Neuroscience
- Materials Science
- Bioengineering
Background:
- Traditional microprobes often suffer from an electrode-tissue gap due to passivation layers, potentially hindering signal quality.
- Existing fabrication methods may not fully optimize electrode integration for high-fidelity neuronal signal acquisition.
Purpose of the Study:
- To introduce novel fabrication methods for integrating planar tetrode-like electrodes into SU-8 polymer microprobes.
- To eliminate the electrode-tissue gap for improved neuronal recording performance.
- To validate the microprobe's efficacy for in vivo neuronal recordings.
Main Methods:
- Development of new fabrication sequences for SU-8 based microprobes.
- Optimization of photolithography and sputtering processes for high step coverage.
- Impedance characterization and in vivo electrophysiological recordings in rat dorsal hippocampus.
Main Results:
- Successfully fabricated polymer microprobes with integrated tetrode electrodes, eliminating the electrode-tissue gap.
- Impedance measurements comparable to commercial probes, indicating suitability for neuronal recording.
- Achieved in vivo recordings of action potentials (400-500 μV peak-to-peak) and local field potentials from rat dorsal hippocampus.
Conclusions:
- The novel fabrication approach enables the creation of high-performance microprobes for neuronal recording.
- The integrated tetrode design enhances the ability to distinguish signals from multiple neuronal sources.
- These microprobes represent a viable tool for advanced neuroscience research and applications.
