Multi-site electrode arrays for neural recording
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Solution Overview
Problem
Current electrode arrays used for neural interfaces, such as the Utah Electrode Array, have limitations in accurately recording impulses from neurons due to their limited ability to distinguish between signals from multiple neurons within the recording radius and cause tissue insult with increased needle density.
Innovation Solution
A multi-site electrode array with multiple electrically active sites on each microneedle, allowing for independent electrical addressing and insulation, which increases the resolution of neuronal recordings and reduces tissue damage by providing a larger number of recording sites within a smaller area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the density of needles in the electrode array is increased to improve recording resolution, then the ability to distinguish signals from multiple neurons is improved, but tissue insult and damage increase
Solution Approach 1:
Each microneedle is segmented into multiple electrically active sites (e.g., 3-5 sites per needle) along its length, allowing the array to achieve high recording resolution without increasing the physical density of needles in the tissue. This segmentation enables multiple recording channels per needle insertion point.
Solution Approach 2:
The patent transitions from a two-dimensional array of needle tips to a three-dimensional distribution of active sites along the length of each needle. This vertical dimension along the needle shaft allows multiple recording sites without requiring additional needles in the lateral plane, thereby avoiding increased tissue insult.
2Quantity of substance
If multiple electrically active sites are placed on each microneedle to increase recording sites, then the number of recording channels is increased, but the complexity of the device increases
Solution Approach 1:
The microneedle structure serves multiple functions: it provides mechanical support, delivers multiple electrically active sites for recording, and enables both acute and chronic recording capabilities. The insulator layer also serves dual purposes of electrical isolation and structural integrity.
Solution Approach 2:
Multiple electrically active sites are combined on a single microneedle shaft, with each site independently addressable through common wiring. The insulator material is applied uniformly across the needle surface, and selective exposure of sites is achieved through patterning rather than separate manufacturing steps for each site.
3Area of stationary object
If more needles are implanted to cover a larger neural volume, then the coverage of neural activity is improved, but the tissue damage and invasiveness increase
Solution Approach 1:
The patent exploits the third dimension (depth along the needle shaft) to distribute active sites, allowing a single needle to sample neural activity across a volumetric region rather than requiring multiple needles to cover the same volume. This reduces the number of needle insertions needed.
Solution Approach 2:
By segmenting each needle into multiple active sites at different depths and lateral positions, the system achieves broad neural coverage with fewer needle insertions, thereby reducing overall tissue damage while maintaining comprehensive sampling capability.
Data Source
AI summary
A multi-site electrode array (100) can include a microneedle array and a set of electrically active sites (115). The microneedle array includes a plurality of microneedles (105) supported on a base substrate (110). The set of electrically active sites (115) can be arranged at and/or near the tip of each microneedle (105), and in many cases along a shaft of the microneedles. Further, at least a portion of the active sites (115) can be independently electrically addressable such that a remaining portion of the active sites (115) are optionally electrically shunted together. In some cases all of the active sites (115) are independently electrically addressable.