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Towards Long-Term Stable Polyimide-Based Flexible Electrical Insulation for Chronically Implanted Neural Electrodes.

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Optimizing oxygen reactive ion etching (RIE) for polyimide flexible neural implants significantly improves long-term stability. Fine-tuning etching parameters doubled device lifetime in accelerated aging tests, crucial for reliable chronic applications.

Keywords:
chronic implantselectrical insulation stabilityflexible implantsinterdigital electrode arraylong-term stabilityneural interfacespolyimide

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Area of Science:

  • Biomaterials Science
  • Neurotechnology
  • Materials Engineering

Background:

  • Flexible neural implants require robust encapsulation materials for long-term stability in saline neural environments.
  • Polyimide is a common biocompatible substrate, but its inertness poses challenges for inter-layer adhesion, risking delamination and short circuits.
  • Oxygen reactive ion etching (O2 RIE) is used to enhance polyimide adhesion, yet process variations' impact on long-term stability remains unclear.

Purpose of the Study:

  • To investigate the influence of O2 RIE process variations (etching time, bias power) on the long-term stability of polyimide-encapsulated neural implants.
  • To establish an accelerated aging test method to evaluate the delamination resistance of flexible neural electrode materials.

Main Methods:

  • Developed an accelerated aging test by immersing gold interdigital structures within polyimide layers in saline solution.
  • Applied elevated temperature, mechanical stress, and an electrical field to accelerate aging.
  • Continuously monitored leakage current to define the failure state for delamination.

Main Results:

  • O2 RIE process variations significantly affect the long-term stability of the test samples.
  • Optimized plasma treatments (e.g., 1 min at 50 W vs. 0.5 min at 25 W) more than doubled the device lifetime, increasing it from 20.9 ± 19.1 days to 44.9 ± 18.9 days.
  • Demonstrated a clear correlation between O2 RIE parameters and improved delamination resistance.

Conclusions:

  • Fine-tuning O2 RIE fabrication processes is critical for enhancing the long-term stability of chronically implanted neural electrodes.
  • While an ideal solution for polyimide delamination is still needed, optimized RIE offers a significant improvement for neural implant reliability.
  • The developed accelerated aging test provides a valuable method for evaluating and optimizing materials for neural interfaces.