Reusable Microfluidic Biomarker Assay With Self-Cleaning Aptamers
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Solution Overview
Problem
Existing biomarker measurement technologies are invasive, costly, and lack real-time monitoring capabilities, making them inconvenient and less accurate for continuous use outside clinical settings.
Innovation Solution
A reusable, self-cleaning microfluidic assay system with aptamer-based biosensors that allows for minimally invasive sample collection and real-time monitoring using microneedles, aptamers, and a self-cleaning mechanism to prepare the device for repeated use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional blood tests are used for biomarker measurement, then measurement precision is improved, but ease of operation deteriorates and loss of time increases
Solution Approach 1:
The device segments the blood sampling process into micro-scale operations through microneedle arrays that penetrate skin to access capillary blood, dividing the large-volume clinical draw into multiple tiny sampling points that are less invasive and easier to perform
Solution Approach 2:
The patent introduces microfluidic channels as intermediaries between the sampling site and analysis chamber, automatically transporting blood samples through capillary action and pressure differentials, eliminating the need for manual sample handling while maintaining measurement precision
2Ease of operation
If disposable tests are used for biomarker measurement, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The device performs self-diagnostics through integrated control systems that automatically regulate fluid flow, temperature, and reagent delivery, enabling a portable disposable format to achieve clinical-grade precision without requiring external laboratory equipment or expert operation
Solution Approach 2:
The patent employs controlled changes in temperature, pH, and pressure parameters within the microfluidic system to optimize biomarker detection sensitivity and specificity, allowing the disposable device to match the analytical performance of reusable clinical instruments
3Measurement precision
If frequent blood draws are performed for continuous monitoring, then measurement precision is improved through multiple data points, but object-generated harmful factors increase due to repeated skin penetration
Solution Approach 1:
The monitoring system segments the continuous health tracking into discrete, spaced sampling events using reusable microneedle arrays that can be sterilized and reused, reducing the frequency of new needle insertions while maintaining sufficient data points for accurate health trend analysis
Solution Approach 2:
The patent implements a recover and reuse protocol for microneedle arrays through sterilization and regeneration processes, allowing the same needles to be discarded after controlled use cycles rather than single-use disposal, thereby reducing total needle penetration events while maintaining hygiene and measurement quality
4Productivity
If reusable biosensors are used for continuous monitoring, then productivity is improved through repeated use, but object-generated harmful factors increase due to biomarker accumulation on sensors
Solution Approach 1:
The patent uses controlled changes in temperature, ionic strength, and pH parameters to selectively dissociate bound biomarkers from aptamer sensors, enabling regeneration of the sensing surface without damaging the aptamer structure or requiring harsh cleaning conditions that would reduce sensor lifespan
Solution Approach 2:
The device maintains continuous monitoring capability by implementing automated cleaning cycles that continuously remove accumulated biomarkers from sensor surfaces between measurements, ensuring the reusable biosensor remains productive over extended periods without degradation from contamination
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 biomarker monitoring outside clinical settings, providing a cost-effective and user-friendly solution for continuous health tracking with minimal invasiveness and high accuracy.
Implementation Method 1
aptamers that can bind with biomarkers to detect the presence of the same
Implementation Method 2
bound biomarkers can be so removed through heat or reagents
Implementation Method 3
the valves of the biochip (100) can be pressure-activated by a vacuum
Data Source
AI summary
An exemplary microfluidic assay device is disclosed that enables minimally invasive extraction and detection of biomarkers in biological fluids. The device includes microneedles for fluid collection, a conductive substrate functionalized with aptamers for biomarker binding, and internal structures to regulate fluid flow. The system supports repeated use through cleaning mechanisms that remove bound biomarkers from the aptamers using heat or chemical reagents. In some embodiments, valves are pressure-activated by a vacuum and control the timing of reagent release from internal reservoirs. Aptamers may be detached and replaced through sequential reagent flows, allowing refunctionalization of the sensor surface for continued use.