Hydrogel Microneedles for Reagentless Biosensing
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Solution Overview
Problem
Current microneedle-based transdermal biosensing technologies face challenges such as complex fabrication processes, potential clogging, and the need for post-processing steps, limiting their ability for in situ and reagentless detection of biomarkers in interstitial fluid.
Innovation Solution
Hydrogel microneedles integrated with nucleic acid probes, such as aptamer probes, that generate measurable signals in situ without requiring additional reagents or processing, enabling continuous and sensitive detection of biomarkers like glucose and ATP through fluorescence or electrochemical signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hollow microneedles are used for ISF extraction, then real-time monitoring capability is achieved, but fabrication complexity increases and clogging risk occurs
Solution Approach 1:
The patent employs porous microneedles made from hydrogel materials that allow ISF to pass through via capillary action. The porous structure is formed during fabrication by incorporating porogens or using phase separation techniques, creating interconnected pores that prevent clogging while maintaining structural integrity. This resolves the contradiction by providing a simpler fabrication process compared to hollow needle assembly while ensuring reliable continuous flow for real-time monitoring.
Solution Approach 2:
The patent extracts the sensing function from a separate device and integrates it directly into the microneedle tip. The sensing elements (enzymes, antibodies, or other recognition molecules) are embedded within the porous matrix of the microneedle itself, allowing ISF to be both extracted and analyzed in situ. This integration eliminates the need for complex hollow needle assemblies with separate sensing chambers, reducing fabrication complexity while maintaining real-time monitoring capability.
2Measurement precision
If antibody-functionalized microneedles are used for biomarker detection, then on-needle detection is achieved, but post-processing steps are still required
Solution Approach 1:
The patent merges the sample extraction function, biomarker detection function, and signal generation function into a single integrated microneedle device. The porous hydrogel matrix contains both the capture elements (antibodies or aptamers) and the signal-generating components (fluorophores, electrochemical reporters) in close proximity. When ISF flows through the porous structure, biomarkers are captured and immediately detected by the embedded signal generators, eliminating the need for separate washing and reagent addition steps required by conventional antibody-functionalized microneedles.
Solution Approach 2:
The microneedle device performs self-detection through its porous structure that automatically draws ISF in via capillary action and enables in situ signal generation. The embedded sensing elements within the porous matrix allow the device to autonomously detect biomarkers without requiring external reagent addition or complex post-processing operations, making the system easier to operate while maintaining high measurement precision.
3Productivity
If hydrogel microneedles are used for ISF extraction, then extraction efficiency is improved, but in situ sensing capability is lost
Solution Approach 1:
The patent creates a composite microneedle structure where a hydrogel matrix (提供高提取效率) is combined with embedded sensing elements (提供原位检测能力). The hydrogel porous structure enables rapid ISF extraction through capillary action, while simultaneously, sensing molecules (enzymes, antibodies, fluorophores) are integrated within the hydrogel network. This composite design allows the microneedle to maintain high extraction efficiency while enabling in situ detection, resolving the contradiction between extraction productivity and sensing capability.
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 hydrogel microneedle system allows for rapid, reagentless, and minimally invasive detection of biomarkers with high sensitivity and specificity, capable of tracking glucose levels in diabetic models and other analytes, offering a platform for continuous, real-time biosensing.
Implementation Method 1
porous MNs use capillary force
Implementation Method 2
hydrogel-based MNs (HMNs) employ material absorption property
Implementation Method 3
detecting targets of interest... through fluorescence or electrochemical signals
Data Source
AI summary
Microneedles for detecting targets are described. The microneedles may be made of a hydrogel and a probe coupled to the hydrogel for generating a measurable signal in the presence of the target. The hydrogel microneedles may be used for in-situ detection of targets, such as biomolecules found in interstitial fluid. Also described are methods or producing hydrogel microneedles, articles and apparatus comprising hydrogel microneedles, and methods and uses of the same. The hydrogel microneedles may be used for biosensing, such as in transdermal patches for detecting biomarkers in a subject. The biosensors may be used for continuous, real-time tracking of targets in-situ, without requiring further reagents or processing steps.