Sensor Arrangement for Reliable Label-Free Hybridization Detection
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Solution Overview
Problem
Existing sensor arrangements face challenges in detecting and evaluating small amplitude signals reliably, particularly in label-free electrical methods, which are complex and costly, and require sophisticated optical or electrochemical systems, making them impractical for widespread use, especially in medical diagnostics.
Innovation Solution
A sensor arrangement with multiple electrodes on a substrate, where capture molecules are immobilized and coupled by an electrically conductive substance, using temporally variable electrical signals to detect changes in impedance, allowing for reliable detection of hybridization events without the need for labels or reference electrodes, enabling efficient operation on semiconductor chips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If label-free electrical methods are used for detection, then the need for expensive labels and reference electrodes is eliminated, but the ability to reliably detect and evaluate small amplitude signals becomes problematic
Solution Approach 1:
The sensor arrangement is divided into multiple sensor electrodes (at least three) that can be independently addressed and evaluated. This segmentation allows for differential measurement techniques where signals from multiple electrodes are compared, enabling reliable detection of small amplitude changes without requiring expensive reference electrodes or labels.
Solution Approach 2:
Multiple sensor electrodes are combined into a single integrated sensor arrangement that shares common infrastructure (substrate, conductive substance, evaluation electronics). This merging reduces overall system complexity and cost while maintaining the ability to perform reliable differential measurements across multiple sensing points.
2Productivity
If multiple sensor electrodes are used in array configuration, then high-throughput analysis capability is improved, but the complexity of electrode configuration and signal evaluation increases
Solution Approach 1:
The sensor electrodes are designed with universal functionality where each electrode can serve as both a sensing element and part of the measurement circuit for other electrodes. The evaluation electronics use standardized signal processing routines that can handle any number of electrodes, allowing the system to scale from few to many electrodes without proportionally increasing complexity.
Solution Approach 2:
The system utilizes temporally variable electrical signals (changing frequency, amplitude, or phase over time) to excite the sensor electrodes and extract multiple measurement parameters from each electrode. This allows rich information extraction from simple electrode structures, enabling high-throughput analysis without complex electrode geometries.
3Measurement precision
If temporally variable electrical signals are applied to sensor electrodes, then detection sensitivity is improved, but the complexity of signal generation and measurement increases
Solution Approach 1:
Temporally variable electrical signals with periodic characteristics (sinusoidal, square, or triangular waves at defined frequencies) are applied to the sensor electrodes. This periodic excitation enables lock-in detection techniques where signals at the excitation frequency are amplified while noise at other frequencies is rejected, significantly improving detection sensitivity with relatively simple signal generation circuitry.
Solution Approach 2:
The measurement system incorporates feedback mechanisms where the response from sensor electrodes is fed back to adjust the excitation signal parameters or to compensate for drift and interference. This feedback approach maintains high detection sensitivity while using straightforward electronic circuits rather than complex algorithms or hardware.
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
This approach allows for reliable detection and evaluation of small amplitude signals, reducing costs and complexity, enabling high-throughput analysis with reduced reagent volumes and increased sensitivity, while avoiding the need for expensive materials and complex electrode configurations.
Implementation Method 1
the sensor electrodes are coupled to one another by means of an electrically conductive substance
Implementation Method 2
using temporally variable electrical signals to detect changes in impedance, allowing for reliable detection of hybridization events
Data Source
AI summary
Sensor arrangement having capture molecules immobilized on any of three sensor electrodes, wherein molecules to be detected can hybridize with the capture molecules; a control circuit for applying a first electrical signal to a selected sensor electrode and simultaneously applying a second electrical signal to at least two of the other sensor electrodes; a detection device, wherein in a first operating state a reference liquid is introduced into the sensor arrangement and a reference value of an electrical signal is detected at the selected sensor electrode, and in a second operating state an analyte possibly having molecules to be detected is introduced into the sensor arrangement and a sensor value of the electrical signal is detected at the selected sensor electrode; and an evaluation circuit, which, on the basis of the reference value and the sensor value, determines whether a hybridization event has taken place at the selected sensor electrode.