Transparent Flexible Microelectrode Array for Neural Imaging
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Solution Overview
Problem
Conventional microelectrodes with rigid and opaque materials hinder the integration of electrophysiology with optical imaging due to blockage of the microscope objective and optical shadows, making it difficult to monitor simultaneous neural activity across different brain regions.
Innovation Solution
A flexible, insertable, and transparent microelectrode array (Neuro-FITM) that can be bent to allow the microscope objective to be lowered, featuring a transparent substrate and electrodes arranged with varying lengths to minimize optical interference and enhance signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional rigid and opaque microelectrode materials are used, then structural strength and stability are improved, but optical transparency and integration with imaging is worsened
Solution Approach 1:
The patent employs flexible substrates including polyimide and thin film structures that are both mechanically robust and optically transparent. These flexible materials allow the electrode array to maintain structural integrity while permitting optical imaging through the substrate, resolving the contradiction between strength and transparency.
Solution Approach 2:
The patent uses composite material structures combining transparent conductive oxides (such as ITO - indium tin oxide) with flexible polymer substrates. This composite approach provides both the mechanical strength needed for implantation and the optical transparency required for imaging integration.
2Reliability
If large probe shanks are used, then electrode stability and signal quality are improved, but microscope objective lowering and field of view are worsened
Solution Approach 1:
The patent segments the probe structure into a thin flexible substrate with distributed electrode contacts rather than a single large rigid shank. This segmentation allows the probe to be thin enough for microscope access while maintaining electrode stability through the distributed contact architecture and flexible substrate properties.
Solution Approach 2:
The patent transitions from traditional three-dimensional rigid probe structures to two-dimensional flexible substrate configurations. This dimensional change allows the electrodes to be arranged in a planar array that provides stable contacts while minimizing the profile height that would interfere with microscope objective positioning.
3Reliability
If opaque electrode materials are used, then electrical conductivity is improved, but optical shadow and imaging quality are worsened
Solution Approach 1:
The patent employs thin film transparent conductive oxide layers that provide sufficient electrical conductivity for neural recording while being thin and transparent enough to minimize optical shadows during imaging. The thin film structure allows light transmission while maintaining electrical function.
Solution Approach 2:
The patent uses composite material systems combining transparent conductive oxides with metallic traces optimized for both electrical performance and optical transparency. This composite approach balances the competing requirements of electrical conductivity and minimal optical interference.
Data Source
AI summary
Flexible, insertable, transparent microelectrode arrays that allow integration of electrophysiological recordings with any optical imaging or stimulation technology are disclosed. In some embodiments of the disclosed technology, a microelectrode array includes a flexible substrate layer including a shank member extending in a first direction and a tapered tip at an end of the shank member, and a plurality of electrode wires arranged in the first direction on the flexible substrate layer, wherein the plurality of electrode wires includes adjacent electrode wires having different lengths from each other such that an electrode wire arranged closer to a centerline of the flexible substrate layer is longer than an adjacent electrode arranged further away from the centerline of the flexible substrate.