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Related Experiment Video

Updated: Jul 2, 2026

Tools for Surface Treatment of Silicon Planar Intracortical Microelectrodes
06:39

Tools for Surface Treatment of Silicon Planar Intracortical Microelectrodes

Published on: June 8, 2022

Collagenase-aided intracortical microelectrode array insertion: effects on insertion force and recording performance.

Kunal J Paralikar1, Ryan S Clement

  • 1Department of Bioengineering, The Pennsylvania State University, University Park, PA 16802, USA

IEEE Transactions on Bio-Medical Engineering
|August 21, 2008
PubMed
Summary
This summary is machine-generated.

Enzymatic treatment of the pia mater with collagenase significantly reduces insertion forces for intracortical microelectrodes. This technique enables thinner implants, potentially minimizing brain trauma and immune response during neural recording.

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Area of Science:

  • Neuroscience
  • Biomaterials Engineering
  • Surgical Techniques

Background:

  • Intracortical microelectrode insertion causes brain trauma due to the intact pia mater.
  • Rigid, large-cross-section designs are required to prevent buckling, increasing trauma and immune response.
  • Minimizing insertion forces is crucial for safer neural device implantation.

Purpose of the Study:

  • To quantify the reduction in insertion force for microelectrodes using enzymatic manipulation of the pia mater.
  • To assess the impact of collagenase treatment on chronic neural recording performance.
  • To investigate the influence of anatomical location on insertion forces.

Main Methods:

  • Microwire arrays were inserted into the rat cortex at a controlled speed (10 microm/s).
  • Insertion forces were measured using a load cell.
  • Collagenase was applied to the pia mater to enzymatically modify the tissue.

Main Results:

  • Collagenase application reduced peak insertion force by approximately 40% (4.04 mN to 2.36 mN).
  • Insertion forces varied significantly with anatomical location (anterior vs. posterior sites).
  • Chronic neural recording performance was not adversely affected by collagenase treatment up to one month.

Conclusions:

  • Controlled collagenase application relaxes mechanical requirements for microelectrode implantation.
  • This technique facilitates the use of thinner microelectrodes, potentially reducing insertion trauma and immune response.
  • Anatomical location is a critical factor influencing insertion forces and should guide implant design.