Neural probe combining microelectrodes and a droplet-based microdialysis collection system for high temporal...

Area of Science:

• Neuroscience
• Bioengineering
• Microfluidics

Background:

• Neural probes are essential tools for brain research.
• Current probes often lack integrated fluidic capabilities for localized sampling.
• High temporal resolution sampling is critical for understanding dynamic neural processes.

Purpose of the Study:

• To develop and validate a novel neural probe combining microfluidic channels with recording and stimulation electrodes.
• To demonstrate the probe's capability for high temporal resolution sampling in situ.
• To present a microfabrication approach for integrating diverse active elements on a single probe surface.

Main Methods:

• Microfabrication of a neural probe integrating electrodes and microfluidic channels.
• Electrical characterization using impedance spectroscopy to assess electrode properties.
• Development of an advanced experimental setup for fluidic function validation, including a T-junction droplet generator.

Main Results:

• Successful integration of recording/stimulation electrodes and a sampling inlet in close proximity.
• Achieved high temporal resolution sampling (170 ms) with 0.84 nL droplet volumes.
• Demonstrated functional validation of fluidic capabilities, with droplets separated by perfluoromethyldecalin (PFD).

Conclusions:

• The novel neural probe successfully integrates microfluidic sampling with electrophysiological functions.
• The device offers high temporal resolution sampling, crucial for neuroscience applications.
• This innovative tool enables precise implantation for combined electrical stimulation and localized sampling in brain structures.