Shear Horizontal SAW Biosensor for Cardiac Troponin Detection
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Solution Overview
Problem
Current high-sensitivity cardiac troponin (hs-cTn) assays for diagnosing myocardial infarction are limited by their non-portability, high costs, and requirement for experienced technical training, and they struggle with late clearance of biomarkers, making it difficult to diagnose recurrent myocardial infarction effectively.
Innovation Solution
A handheld, portable shear horizontal (SH) surface acoustic wave (SAW) sensor system with functionalized detection lanes that uses a wet-dry method to concentrate samples, allowing for specific antibody-antigen interactions and enabling measurements at concentrations as low as 10 pg/ml without the need for extensive technical training, and allows for multiplexed biomarker measurements and simultaneous electrocardiogram (EKG) testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional high-sensitivity cardiac troponin assays are used, then detection sensitivity is improved, but portability and ease of operation deteriorate
Solution Approach 1:
The patent replaces complex mechanical laboratory equipment with a portable SAW sensor system that uses surface acoustic wave technology. The sensor detects troponin through immunochemical reactions on a piezoelectric substrate, eliminating the need for large-scale laboratory machinery while maintaining high detection sensitivity.
Solution Approach 2:
The patent changes the detection parameter from traditional bulk liquid analysis to surface-constrained immunochemical reactions. By functionalizing the SAW sensor surface with antibodies and detecting bound troponin through acoustic wave propagation changes, the system achieves high sensitivity in a portable format.
2Measurement precision
If conventional laboratory-based hs-cTn assays are used, then measurement accuracy is improved, but device complexity and cost worsen
Solution Approach 1:
The patent extracts the essential detection function from complex laboratory assays by isolating the immunochemical reaction and acoustic detection components. The SAW sensor integrates the antibody-functionalized surface and acoustic wave detection into a single compact device, removing unnecessary laboratory infrastructure.
Solution Approach 2:
The patent creates a universal detection platform where the same SAW sensor technology can detect multiple biomarkers by changing the functionalization layer. This multi-functional approach reduces overall system complexity compared to having separate specialized tests for each biomarker.
3Measurement precision
If troponin measurements are taken sequentially to address late clearance, then diagnostic accuracy for recurrent infarction is improved, but analysis time worsens
Solution Approach 1:
The patent enables continuous or rapid sequential measurements by maintaining the SAW sensor in a ready state with functionalized surfaces. The portable design allows repeated sampling and rapid re-measurement without requiring re-preparation of reagents or equipment, facilitating continuous monitoring for recurrent infarction.
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
The system provides rapid, reliable, and sensitive detection of cardiac troponin I and other biomarkers, reducing analysis time to less than 10 minutes and increasing diagnostic confidence with accurate measurements across a wide dynamic range, from 2 pg/ml to 24 µg/ml, facilitating bedside diagnostics and reducing the risk of misdiagnosis.
Implementation Method 1
a shear horizontal (SH) surface acoustic wave (SAW) biosensor to detect the binding of target antigens to specific antibodies that are immobilized on a piezo-electric substrate
Implementation Method 2
specific antibodies that are immobilized on a piezo-electric substrate (lithium tantalite)
Implementation Method 3
removing fluid from the functionalized detection lane to concentrate the sample in the functionalized detection lane
Data Source
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AI summary
The illustrated embodiments include a method of operating a SAW sensor to detect a sample in a fluid which includes the steps of: providing a SAW sensor with a functionalized detection lane in a handheld, portable assay and sensor system; maintaining the functionalized detection lane of the SAW sensor dry until the sample is fluidicly disposed in the detection lane; fluidicly disposing the sample in the functionalized detection lane; removing fluid the functionalized detection lane to concentrate the sample in the functionalized detection lane to increase the probability of a specific antibody-antigen interaction; washing the functionalized detection lane so that substantially only the specific antigen-antibody interaction remains in the functionalized detection lane; removing fluid from the functionalized detection lane again; and measuring concentration of the sample while the functionalized detection lane is fluid-free.