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Spinal Cord: Information Processing

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Soft neural interface with color adjusted PDMS encapsulation layer for spinal cord stimulation.

Minjie Wang¹, Yuan Zhang¹, Aiping Wang¹

¹Laboratory for Neural Interface and Brain Computer Interface, Engineering Research Center of AI & Robotics, Ministry of Education, Shanghai Engineering Research Center of AI & Robotics, MOE Frontiers Center for Brain Science, State Key Laboratory of Medical Neurobiology, Institute of AI & Robotics, Institute of Meta-Medical, Academy for Engineering & Technology, Fudan University, Shanghai, PR China.

Journal of Neuroscience Methods

|February 21, 2025

Summary

This study introduces a new laser-micromachining technique for soft neural interfaces using color-adjusted polydimethylsiloxane (PDMS). This method enhances biocompatibility and electrochemical performance for spinal cord stimulation (SCS) applications.

Keywords:

Electrochemistry Laser micro-machining Neural electrode Oily pigment PDMS Spinal cord stimulation

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Area of Science:

Bioelectronics
Materials Science
Neuroscience

Background:

Spinal cord stimulation (SCS) is vital for treating neurological disorders.
Soft spinal cord electrodes improve fit and reduce tissue damage.
Polydimethylsiloxane (PDMS) is ideal for soft bioelectronics, but its micromachining is challenging.

Purpose of the Study:

To develop a fully laser-micromachined soft neural interface for SCS.
To investigate laser processing of native and color-adjusted PDMS.
To evaluate the impact of electrode size on electrochemical performance.

Main Methods:

Utilized laser micromachining for soft neural interface fabrication.
Investigated variable absorbance characteristics of PDMS in laser processing.
Assessed electrochemical performance via equivalent circuit modeling and biocompatibility through cytotoxicity assays.
Validated the neural interface in vivo in mice.

Main Results:

Color-adjusted PDMS demonstrated good biocompatibility and reduced thermal damage.
Enhanced electrochemical performance of bioelectronic devices was observed.
The soft neural interface safely activated motor function.

Conclusions:

The laser-micromachined soft neural interface with color-adjusted PDMS encapsulation is promising for SCS.
This novel method offers low thermal effects, high uniformity, and scalability.