Aptamer-Based Cuff for Interstitial Fluid Biomarker Detection
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Solution Overview
Problem
There is a need for a portable medical device capable of providing contemporaneous and on-the-site medical assessment of patients' bodily fluids to ascertain health status and render early and accurate diagnosis, especially in remote or emergency situations where access to advanced laboratory equipment is impossible or impractical.
Innovation Solution
A cuff-like medical device equipped with microneedles that penetrate the skin to extract interstitial fluid, which is then analyzed using an aptamer-based system involving quartz crystal microbalances for real-time measurement of biomarker concentrations, enabling immediate diagnostic feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If advanced laboratory equipment is used for medical diagnostics, then measurement precision is improved, but device complexity and portability are worsened
Solution Approach 1:
The patent extracts the core diagnostic function from complex laboratory equipment and implements it in a simplified portable device. The cuff-like device with microneedles and aptamer-based sensors isolates the essential measurement capability, removing unnecessary complexity while maintaining diagnostic accuracy for key biomarkers in interstitial fluid.
Solution Approach 2:
The patent replaces complex mechanical laboratory instrumentation with a simplified system using aptamer-based molecular recognition and quartz crystal microbalance detection. This substitution eliminates the need for sophisticated mechanical processing equipment while achieving high-precision biomarker measurement through direct molecular binding events.
2Measurement precision
If advanced laboratory equipment is used for medical diagnostics, then measurement precision is improved, but ease of operation is worsened
Solution Approach 1:
The patent segments the diagnostic system into a portable cuff-like device that can be easily applied to the patient's arm, containing all necessary components (microneedles, fluidic channels, sensors, and processing electronics) in a compact form factor. This segmentation enables high-precision diagnostics to be performed at the point of care without requiring transport to centralized laboratories.
3Speed
If real-time monitoring is implemented, then speed of diagnosis is improved, but use of energy is worsened
Solution Approach 1:
The patent implements self-service through the autonomous operation of the cuff-like device, which automatically performs fluid extraction via microneedles, processes the interstitial fluid through integrated fluidic channels, conducts real-time biomarker measurements using aptamer-QCM sensors, and transmits results without requiring continuous human intervention or high energy input.
Solution Approach 2:
The patent employs parameter changes by utilizing the frequency shift of quartz crystal microbalances as aptamers bind to target biomarkers. This physical parameter change (frequency) provides a direct, real-time measurement signal that requires minimal energy for detection and processing, enabling continuous monitoring with low power consumption.
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 device allows for real-time, on-site analysis of biomarkers in bodily fluids, providing immediate diagnostic information that can inform emergency treatment decisions and enhance patient care in remote or resource-limited settings.
Implementation Method 1
The microneedles are configured to penetrate the epidermis (i.e., the top layer of skin), which lacks nerves and allows for a pain free way to access a patient's bodily fluid
Implementation Method 2
The interstitial fluid is directed from the dermis layer of the patient and into the device for analysis by drawing the fluid through a plurality of microneedles
Implementation Method 3
traverse a series of quartz crystals configured in vitro to bond, via aptamer-binding, with the specific molecular structure of one or more elements of interest
Implementation Method 4
The aptamers are configured to chemically bind to the molecules of the element desired to be measured (by presence, concentration or otherwise)
Implementation Method 5
an onboard microprocessor employs nanoscale weighing using frequency differential analysis through quartz crystal microbalances for the purpose of determining the protein concentration within the interstitial fluid
Data Source
AI summary
The present invention is directed to a cuff-like medical device that may analyze and report the concentrations of biomarkers in a subject's bodily fluids, samples of which may be extracted by the device in the field and analyzed on the spot using the cuff-like medical device. For example, extracellular fluid (commonly known as “tissue fluid”) of a patient may be analyzed by the present invention, and in particular, the constituent interstitial fluid—the known main component of extracellular fluid—may be analyzed for concentrations of one or more specific types of proteins. A sensor component within the device may include one or more aptamers that permit chemical binding of at least one biomarker of interest. When the aptamer-protein binding complex is complete, an electronic component of the device may employ nanoscale weighing using frequency differential analysis through quartz crystal microbalances to determine the presence and concentration of biomarkers.