3D FET Sensor Arrays for Intracellular Recording
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Solution Overview
Problem
Current electrophysiological recording methods, such as patch clamping and voltage-sensitive dyes, face challenges in accurately and scalably recording transmembrane potentials across multiple cells due to cytotoxicity, low temporal resolution, and difficulty in capturing subthreshold and low-amplitude cellular signals.
Innovation Solution
A scalable three-dimensional (3D) FET sensor array is developed, featuring a high-performance field-effect transistor (FET) array that minimally invasively interfaces with cells, enabling faithful recordings of transmembrane potentials with high spatial and temporal resolutions, and is fabricated using a compressive buckling technique to achieve accurate intracellular signal conduction velocity measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive electrodes are used for intracellular recording, then device simplicity is maintained, but measurement precision deteriorates due to large impedance preventing detection of subthreshold and low-amplitude signals
Solution Approach 1:
The patent replaces passive mechanical electrodes with active FET-based sensors that use field-effect transistor physics to detect cellular signals. The FET's high input impedance and low noise characteristics enable detection of subthreshold potentials and low-amplitude intracellular signals that passive electrodes cannot capture, resolving the contradiction between device simplicity and measurement precision.
2Measurement precision
If patch clamping is used for high-fidelity transmembrane potential recording, then measurement precision is improved, but device complexity and operational difficulty increase making it challenging to perform on multiple cells simultaneously
Solution Approach 1:
The patent segments the recording function into multiple independent FET sensors arranged in arrays, allowing simultaneous recording from multiple cells. Each FET operates independently with patch-clamp-like fidelity, eliminating the need for manual manipulation required by traditional patch clamping while maintaining high measurement precision across many cells in parallel.
Solution Approach 2:
The patent creates replicated FET sensor structures that can be fabricated in large numbers using standard semiconductor manufacturing processes. These copied sensors provide patch-clamp quality recording capability across multiple cells simultaneously, resolving the contradiction between high-fidelity single-cell recording and scalability to multiple cells.
3Productivity
If voltage-sensitive dyes are used for parallel recording of multiple cells, then productivity is improved by recording multiple cells simultaneously, but object-affected harmful factors increase due to cytotoxicity and low temporal resolution
Solution Approach 1:
The patent substitutes optical voltage-sensitive dye methods with electrical FET-based sensing, eliminating cytotoxicity associated with dye loading and photodamage from fluorescence excitation. The FET sensors provide direct electrical coupling to cells for high-fidelity, high-temporal-resolution recording of intracellular signals without harmful chemical or optical effects.
4Measurement precision
If active FET sensors are used for intracellular sensing with minimal access impedance and wide bandwidths, then measurement precision is improved, but device complexity increases and scalability to large arrays has not been demonstrated
Solution Approach 1:
The patent divides the sensor system into modular FET units that can be independently fabricated and then integrated into arrays. This segmentation allows complex high-performance FET structures to be manufactured using standard semiconductor processes and then assembled into scalable arrays, resolving the contradiction between individual sensor complexity and overall system scalability.
Solution Approach 2:
The patent optimizes FET physical parameters including channel dimensions, material composition, and geometric configuration to achieve minimal access impedance and wide bandwidth characteristics. By carefully controlling these parameters during fabrication, high-performance intracellular sensing is achieved while maintaining compatibility with standard manufacturing processes for scalability.
Data Source
AI summary
A method for fabricating a three-dimensional (3D) FET sensor array includes fabricating a two-dimensional (2D) precursor field-effect transistor (FET) sensor array having a plurality of nanoscale or microscale FETs using any suitable microfabrication techniques. Each of the nanoscale or microscale FETs have a kink at which a FET channel is located. The 2D nanoscale or microscale precursor FET sensor array is caused to buckle or fold into a third dimension, also using any suitable technique.