Hydrophilic Thread Diagnostic Platform for Low-Cost Bioassays
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Solution Overview
Problem
Current bioanalytical assays are inaccessible to developing economies due to their high cost and requirement for large, expensive laboratory instruments and trained personnel, making them unsuitable for low-cost settings and small sample volumes.
Innovation Solution
The development of hydrophilic thread-based diagnostic systems that are inexpensive, portable, and require no external equipment or power sources, allowing for low-cost, multiplexed bioassays that can be performed on small sample volumes, such as the simultaneous detection of glucose and protein in 20 μL of artificial urine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional laboratory instruments and assays are used, then diagnostic accuracy and reliability are improved, but cost and device complexity increase significantly
Solution Approach 1:
The patent employs disposable test strips with pre-loaded reagents and single-use microfluidic devices that eliminate the need for expensive, complex laboratory instruments. These disposable elements perform complete assays independently, providing reliable diagnostic results without requiring maintenance of complex equipment or trained personnel for operation.
Solution Approach 2:
The diagnostic system is designed to be self-contained with integrated reagents, sample handling mechanisms, and detection components all packaged in a single disposable unit. The system performs sample processing, reagent mixing, and result detection automatically without requiring external laboratory equipment or specialized operator intervention, thereby maintaining reliability while reducing complexity.
2Adaptability or versatility
If traditional laboratory instruments are used, then diagnostic capability is improved, but cost increases making them inaccessible to developing economies
Solution Approach 1:
The patent utilizes inexpensive disposable test strips and microfluidic devices that can be manufactured at low cost using simple production processes. These single-use elements incorporate all necessary reagents and functional components, enabling versatile diagnostic capability across multiple analytes while keeping manufacturing costs accessible to developing economies and point-of-care settings.
Solution Approach 2:
The diagnostic system is designed with multi-functional test strips that can detect multiple different analytes using a single device platform. This universality allows one disposable element to perform various diagnostic functions, reducing the need for multiple specialized instruments and thereby lowering overall manufacturing and deployment costs while maintaining broad diagnostic capability.
3Ease of operation
If dipstick technologies are used, then accessibility is improved, but sample volume requirements are too large and cost remains high
Solution Approach 1:
The patent employs porous microfluidic channels and absorbent materials within the test strip that efficiently wick and transport small volumes of sample through the assay zones. The porous structure provides high surface area to volume ratio, enabling complete reactions and detectable signals with minimal sample input, thereby improving accessibility while reducing sample volume requirements below traditional dipstick levels.
4Ease of manufacture
If simple disposable systems are used, then cost and portability are improved, but assay time may increase
Solution Approach 1:
The disposable test strips are pre-loaded with reagents in optimized concentrations and configurations during manufacturing. Sample preparation steps are minimized or eliminated as the disposable device handles all processing automatically upon sample application. This preliminary preparation of reagents and pathways enables rapid assay completion within minutes while maintaining the simplicity and low cost of disposable construction.
Solution Approach 2:
The porous microfluidic structures are engineered to provide controlled capillary flow rates that optimize reaction kinetics. The high surface area and efficient mass transport through porous materials accelerate analyte-reagent interactions, reducing assay time despite the simple disposable format. The porous architecture enables rapid sample distribution and reaction completion without requiring complex external pumping or heating systems.
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 systems are small, disposable, easy to use, and provide a visible indication of analytes present in fluid samples, making them suitable for use in developing countries and as an alternative to more advanced technologies, with rapid assay times on the order of minutes and minimal sample volume requirements.
Implementation Method 1
After the sample is applied to the inlet zone, the sample is carried through the loading thread from the inlet zone through the intermediate zone by capillary action.
Data Source
AI summary
Hydrophilic threads as platforms for inexpensive, low volume, portable diagnostic systems, and methods of making the same are described. A diagnostic system includes a hydrophilic loading thread having an inlet zone at a proximal end; a testing zone at a distal end; and an intermediate zone located between the inlet zone and the testing zone, wherein the testing zone does not directly contact the inlet zone. In another aspect, a diagnostic system includes (i) a hydrophilic loading thread that includes an inlet zone at a proximal end and an intermediate zone at a distal end; and (ii) one or more additional hydrophilic threads that contact the intermediate zone of the loading thread. A method of detecting the presence or absence of an analyte in a fluid sample includes applying the sample to an inlet zone of a diagnostic system that includes a hydrophilic loading thread with an inlet zone at a proximal end; an intermediate zone; and a testing zone at a distal end; wherein the testing zone does not directly contact the inlet zone.