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Published on: February 4, 2011
A method for stable electrical connection of a multi-channeled polyimide electrode with PCB
Dong-Hyun Baek1, Ha-Chul Jung, Seon Min Kim
1School of Electrical Engineering and Department of Biomedical Engineering, College of Health Science, Korea University, Seoul, Republic of Korea. wpvmqor@korea.ac.kr
Summary
We developed a new packaging method for thin polyimide microelectrodes using nickel rings for stable electrical connections. This technique enables high-resolution neural signal recording in animal studies.
Area of Science:
- Biomedical Engineering
- Neuroscience
- Materials Science
Background:
- Thin polyimide (PI) multichannel microelectrodes are crucial for high-resolution neural recordings.
- Existing packaging methods can face challenges with stable electrical connections and adhesion to printed circuit boards (PCBs).
Purpose of the Study:
- To propose and validate a novel packaging method for thin polyimide multichannel microelectrodes.
- To enhance the stability and adhesion of microelectrodes for reliable neural signal acquisition.
Main Methods:
- A via-hole was created in the interconnection pads of thin PI electrodes.
- A nickel (Ni) ring was electroplated through the via-hole for robust soldering and PCB adhesion.
- Electroplating conditions were optimized, and electrical properties were evaluated.
- A 40-channel thin PI electrode was fabricated and packaged using the developed method.
Main Results:
- The optimized electroplating process successfully formed a well-organized Ni ring.
- The packaged electrode demonstrated stable electrical properties.
- The fabricated 40-channel electrode was successfully used in an animal experiment for neural recordings.
Conclusions:
- The proposed Ni ring electroplating method provides a stable and reliable packaging solution for thin polyimide multichannel microelectrodes.
- This packaging technique facilitates high-resolution neural signal recording from the rat skull, paving the way for advanced neurophysiological studies.
