3D Microneedle Electrode Array for High-SNR Cell Interrogation
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Solution Overview
Problem
Current microelectrode arrays are inadequate for interfacing with three-dimensional microphysiological systems, particularly in high-throughput formats, due to low signal-to-noise ratios and poor tissue-specific architecture compatibility, limiting their ability to capture physiologically relevant signals and requiring improved tools for electrophysiological data acquisition in complex cellular models.
Innovation Solution
A three-dimensional microelectrode array with integrated microfluidic ports and transparent substrates, featuring hypodermic microneedles and metallic traces, enabling simultaneous electrical, optical, and microfluidic interrogation of electrogenic cell constructs, utilizing micromilling and magnetic insertion processes for precise fabrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional two-dimensional microelectrode arrays are used, then device complexity is reduced and ease of manufacture is improved, but signal-to-noise ratio deteriorates and measurement precision is reduced
Solution Approach 1:
The patent transitions from conventional two-dimensional planar electrodes to three-dimensional microelectrode arrays with vertical microneedle structures. The microneedles extend through the substrate thickness (e.g., 500 μm to 5.0 mm), creating a third dimension that increases electrode-tissue contact area and improves signal-to-noise ratio by capturing physiologically relevant signals from multiple depths within the tissue architecture.
2Reliability
If three-dimensional microelectrode arrays are implemented, then measurement precision and tissue interface compatibility are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The electrode array is segmented into multiple independent microneedles (e.g., 6-12 needles per array) that can be individually fabricated and then assembled. Each microneedle is a discrete component with controlled dimensions (length exceeding substrate thickness by 1.3 to 1.6 times), allowing modular manufacturing that reduces overall fabrication complexity while maintaining 3D tissue interface compatibility.
Solution Approach 2:
The microneedles are inserted through pre-formed holes in the substrate, with metallic traces nested within the substrate layers to interconnect the needles. This nested structure integrates the electrodes within the substrate architecture, simplifying assembly while achieving reliable tissue interface compatibility through the 3D configuration.
3Measurement precision
If hypodermic microneedles extending beyond substrate are used, then measurement precision is improved, but manufacturing precision requirements increase
Solution Approach 1:
Holes are pre-formed in the substrate at predetermined locations and depths before microneedle insertion. The microneedles are then inserted to specific depths (1.3 to 1.6 times substrate thickness) to ensure consistent electrode positioning. This preliminary hole formation step establishes precise geometric constraints that guide subsequent needle insertion, reducing manufacturing precision requirements during assembly.
Data Source
AI summary
A three-dimensional (3D) microelectrode array includes a substrate having a plurality of vias. A microneedle is received within each via of one or more vias and each has a length that exceeds the thickness of the substrate to form a microneedle array on the top face of the substrate. Metallic traces are formed on the bottom face and interconnect the microneedles. A culturing area is formed in the top face.