Integrated Flexible Substrate Diagnostics for Point-of-Care Testing
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Solution Overview
Problem
Existing point-of-care (POC) testing devices face challenges such as high cost, the need for separate reader apparatuses with built-in electronics, inaccurate readings due to subjective user visualization of color changes, and limitations in achieving high-accuracy diagnostic capabilities, especially in areas requiring sensitive viral load detection.
Innovation Solution
The development of disposable devices with flexible substrates, including paper-based, elastomeric, or plastic portions, integrated with sensory electronics that provide quantitative information without requiring an external reader apparatus, using onboard electronic circuitry for analysis and indicators to display results objectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dedicated reader apparatuses with built-in electronics are used for POC testing, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the test strip and reader apparatus into a single integrated device. The test strip includes both the sensing elements and the electronic circuitry (microprocessor, memory, display) needed to process and display results, eliminating the need for separate reader devices and reducing overall system complexity while maintaining diagnostic accuracy.
Solution Approach 2:
The integrated device is designed to perform multiple functions within a single unit: sample application, reagent mixing, reaction incubation, optical measurement, data processing, and result display are all accomplished by one device, making it universally applicable for various POC testing needs without requiring multiple specialized apparatuses.
2Measurement precision
If dedicated reader apparatuses are used for POC testing, then measurement precision is improved, but cost increases
Solution Approach 1:
The patent implements a disposable integrated test strip device that combines the sensing elements with basic electronic components in a single-use format. This eliminates the need for expensive, reusable reader apparatuses, significantly reducing per-test costs while maintaining measurement precision through integrated optical sensors and microprocessors.
Solution Approach 2:
The integrated device is self-contained with all necessary components (reagents, sensors, processing electronics, display) built into the test strip itself. The device automatically performs measurement, data processing, and result display without requiring external reader apparatuses or additional equipment, thereby reducing manufacturing and operational costs.
3Ease of operation
If user visualization of color changes is used for reading results, then ease of operation is improved, but measurement precision deteriorates due to subjective assessment
Solution Approach 1:
The patent replaces the mechanical/visual assessment method (user looking at color changes) with an optical measurement system. Integrated optical sensors and photodetectors objectively measure the colorimetric or fluorometric signals, converting them into quantitative data that is processed by a microprocessor to generate accurate numerical results, thereby eliminating subjective user assessment while maintaining ease of operation.
Solution Approach 2:
The patent introduces an intermediary optical measurement system between the sample reaction and the final result. Instead of users directly visualizing color changes, optical sensors detect the optical properties of the reaction products and transfer this information through electronic processing to the display, providing objective and precise measurements while keeping the operation simple for users.
4Measurement precision
If external light sources are used to illuminate test strips, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent integrates the light source directly into the test strip structure, combining the illumination function with the sensing elements. The light-emitting diodes (LEDs) are positioned in close proximity to the reaction zones, eliminating the need for separate external illumination systems and reducing overall device complexity while maintaining optical measurement accuracy.
Solution Approach 2:
The patent transitions from external illumination (separate spatial component) to integrated illumination (embedded within the test strip plane). By incorporating light sources directly into the test strip structure, the illumination function is achieved in a different dimensional arrangement, reducing system complexity while maintaining measurement precision.
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
These devices offer low-cost, accurate, and straightforward POC diagnostics capable of providing quantitative information for various analytes, including glucose levels, viral loads, and other health markers, with improved thermal compensation and reduced complexity, making them suitable for resource-limited settings and rapid testing.
Implementation Method 1
an output signal including at least a color change is generated representing a degree to which the reagent reacts with the biological sample
Implementation Method 2
at least one light source to illuminate the reagent and the sample, when present, to measure the color change and provide an optical signal representing the color change
Implementation Method 3
at least one photodetector to detect the optical signal and generate an output electrical signal representing the color change
Data Source
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AI summary
Devices are described for providing quantitative information relating to a sample. Example devices include a flexible substrate, a sample receiver at least partially formed in or disposed on the flexible substrate, electronic circuitry and at least one indicator electrically coupled to the electronic circuitry. The flexible substrate includes at least one paper-based portion, at least one elastomeric portion, or at least one plastic portion. The electronic circuitry and the at least one indicator are at least partially formed in or disposed on the flexible substrate. The electronic circuitry generates an analysis result based on an output signal from the sample or a derivative of the sample. The at least one indicator provides an indication of the quantitative information relating to the sample based at least in part on the at least one analysis result.