Integrated Biosensor Array for Real-Time Impedance Detection
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Solution Overview
Problem
Current microarray technologies face challenges in accurately and efficiently measuring the binding characteristics and concentrations of multiple analytes due to unpredictable incubation times, platform inconsistencies, and interference from unbound labeled species, which complicates data analysis and requires improvements in detection methods.
Innovation Solution
A fully integrated biosensor array comprising a molecular recognition layer, an optical layer, and a sensor layer in a sandwich configuration, with embedded detection circuitry and optical sensors, allowing for real-time measurement of analyte binding and concentration determination through fluorescence spectroscopy, reducing the need for washing steps and enhancing data quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional fluorescent-based microarrays are used with incubation steps, then analyte binding can be detected, but the detection is compromised by large concentration of floating labeled species that overwhelm the target-specific signal and require washing steps that cause artifacts
Solution Approach 1:
The patent extracts and removes the harmful floating labeled species from the detection system by using label-free impedance detection. Instead of using fluorescent labels that create background interference, the invention detects analyte binding directly through changes in electrical impedance at the sensor surface, eliminating the source of signal overwhelming and washing artifacts.
Solution Approach 2:
The patent replaces the optical detection system (fluorescence spectroscopy with filters and light sources) with an electrical impedance detection system. This substitution eliminates the need for optical filters and complex light paths, reducing device complexity while improving measurement precision by directly detecting binding events through electrical properties.
2Productivity
If densely packed biosensor arrays are implemented to detect thousands of analytes simultaneously, then parallel detection capability is improved, but incubation time becomes unpredictable and platform inconsistencies increase
Solution Approach 1:
The patent implements real-time impedance monitoring that provides continuous feedback on binding kinetics. This allows for dynamic adjustment of measurement parameters and ensures consistent detection across different platforms by monitoring the actual binding process rather than relying on fixed incubation times, thereby improving reliability while maintaining high productivity.
Solution Approach 2:
The patent transitions from static endpoint measurement (fixed incubation time) to dynamic real-time monitoring of binding processes. By continuously measuring impedance changes during incubation, the system can adapt measurement timing to actual binding kinetics, ensuring consistent results across different platforms and analyte types while maintaining high-throughput parallel detection.
3Loss of time
If integrated biosensor arrays with embedded detection circuitry are used, then real-time measurement capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the detection circuitry directly with the sensor array substrate, integrating impedance measurement electronics at the pixel level. This consolidation enables real-time measurement of binding events at each array position simultaneously, dramatically reducing analysis time while the integration is achieved through standard semiconductor fabrication processes that manage device complexity.
Solution Approach 2:
The patent creates a universal sensor platform where the integrated impedance detection circuitry can measure multiple analyte types across the entire array simultaneously. Each sensor element performs multiple functions (binding detection, signal amplification, and readout) through the embedded circuitry, reducing the need for separate detection systems and managing complexity through multi-functionality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate, real-time detection of multiple analytes with improved signal quality and reduced analysis time, overcoming the limitations of conventional microarrays by integrating optical sensors and detection circuitry for precise binding kinetics and concentration measurement.
Implementation Method 1
The optical layer comprises an optical filter layer, wherein the optical layer transmits light from the molecular recognition layer to the sensor layer
Implementation Method 2
The sensor layer comprises an array of optical sensors that detect the filtered light transmitted through the optical layer
Implementation Method 3
The molecular recognition layer can transmit light to the optical layer
Data Source
AI summary
A biosensor array, system and method for affinity based assays that are able to simultaneously obtain high quality measurements of the binding characteristics of multiple analytes, and that are able to determine the amounts of those analytes in solution. The invention also provides a fully integrated bioarray for detecting real-time characteristics of affinity based assays.