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Neuroscience JoVE (Open Access) Citable · DOI

Chronic Implantation of Multiple Flexible Polymer Electrode Arrays

DOI: 10.3791/59957-v
What you'll learn
  • ✓ Prepare and insert multiple flexible polymer electrode arrays into distant brain regions
  • ✓ Execute chronic implantation surgery in freely moving rats with proper micromanipulator alignment
  • ✓ Achieve stable long-term electrophysiological recordings from implanted arrays
  • ✓ Adapt implantation methods for alternative species using design principles
Protocol

Described below is a method for implantation of multiple polymer electrode arrays across anatomically distant brain regions for chronic electrophysiological recording in freely moving rats. Preparation and surgical implantation are described in detail, with emphasis on design principles to guide adaptation of these methods for use in other species.

Difficulty
advanced
Total time
~4–6 hours per rat (surgery + recovery monitoring)
Model organism
Rat (Sprague Dawley or Lewis strain implied)
Biosafety
BSL-1

Steps

1
Prepare polymer electrode arrays for implantation

Assemble and verify the flexible polymer electrode arrays prior to surgery. Ensure proper electrode contact and array integrity.

▶ 00:45
2
Align and prepare micromanipulator positioning

Set up and calibrate micromanipulators for stereotaxic guidance. Position apparatus to target anatomically distant brain regions.

▶ 02:39
3
Insert arrays serially into target brain sites

Sequentially lower and position polymer electrode arrays into planned anatomical locations using micromanipulator control.

▶ 03:58
4
Retract shuttle and construct chronic implant

Remove insertion guides, secure electrode arrays in place, and assemble the final implant headstage for chronic recording.

▶ 05:34
5
Assess single-unit yield and recording stability

Verify electrophysiological signal quality and document unit yields across implanted arrays during representative post-implantation recordings.

▶ 07:25
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