Optical Multi-Analyte Detection With Microneedle Chromophore Arrays
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Solution Overview
Problem
Conventional analyte sensing technologies face challenges such as limited penetration depth of visible light, requirement for exotic chromophores, invasive implantation, motion artifacts, inability to measure multiple analytes simultaneously, and impracticality for dynamic environments.
Innovation Solution
An optical sensing device using a microneedle array with analyte-sensing chromophores that penetrate shallowly into the skin to detect multiple analytes through photophysical property changes, allowing for real-time, minimally invasive monitoring via optically transparent transdermal windows and compatible polymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical sensors are implanted deeply in the skin (3-6mm), then analyte detection capability is improved, but visible light penetration becomes impossible and exotic chromophores are required
Solution Approach 1:
The sensing function is segmented across multiple microneedles in an array configuration, with each microneedle containing chromophores that can be independently excited and detected. This segmentation allows the use of visible light wavelengths (400-600nm) that penetrate shallowly into the skin, avoiding the need for deep implantation and exotic chromophores while maintaining analyte detection capability through distributed sensing points.
Solution Approach 2:
The patent transitions from a single deep-implant sensor approach to a multi-point surface array approach. By distributing multiple sensing points across the skin surface rather than relying on a single deep implant, the system achieves comprehensive analyte detection using visible light wavelengths that naturally penetrate the epidermis, eliminating the need for deep tissue penetration and exotic chromophores.
2Duration of action of moving object
If implanted optical sensors are used, then continuous monitoring is enabled, but the sensor becomes unusable after a certain time and requires invasive removal
Solution Approach 1:
The microneedle array is designed as a disposable, biodegradable system that can be easily removed or allows natural degradation over time. Each microneedle contains chromophores and sensing materials that function continuously during the wear period, then naturally degrade or can be simply removed without invasive procedures, eliminating the need for complex explant surgery while maintaining continuous monitoring capability throughout the sensor's service life.
Solution Approach 2:
The system allows for the natural discarding of the microneedle array after its monitoring function is complete, with the biodegradable materials safely degrading in the body or being easily removed. This eliminates the need for invasive sensor recovery procedures while maintaining continuous monitoring capability during the sensor's operational period.
3Measurement precision
If pulse oximetry is used to monitor oxygen saturation, then oxygen levels can be measured, but motion artifacts limit use in dynamic environments
Solution Approach 1:
The patent replaces the mechanical pulse oximetry approach with an optical sensing system using microneedles that directly contact interstitial fluid. The chromophores in the microneedles provide stable optical signals that are not affected by motion artifacts, enabling accurate oxygen saturation measurements in dynamic environments where conventional pulse oximetry fails.
Solution Approach 2:
The microneedles act as intermediaries between the optical detection system and the interstitial fluid, providing a stable interface that maintains consistent optical contact despite body motion. This intermediary structure eliminates motion artifacts by physically coupling the sensing elements to the fluid compartment, enabling reliable measurements in dynamic conditions.
4Adaptability or versatility
If multiple separate devices are used to detect multiple analytes, then comprehensive health monitoring is achieved, but the system becomes unwieldy and costly
Solution Approach 1:
The microneedle array serves multiple functions simultaneously: it detects oxygen saturation, glucose levels, and other analytes through a single integrated system. Each microneedle in the array can be functionalized with different chromophores and sensing materials, allowing one device to perform multiple analytical functions that would traditionally require separate devices, thereby reducing overall system complexity and cost.
Solution Approach 2:
The patent merges multiple analyte detection functions into a single integrated microneedle array system. By combining multiple chromophores and sensing materials within one array, the system achieves comprehensive multi-analyte monitoring without requiring multiple separate devices, reducing complexity and cost while maintaining comprehensive health monitoring 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
Enables simultaneous, continuous, and real-time monitoring of multiple analytes in dynamic environments without motion artifacts, using commercially available or synthesizable chromophores, and avoiding invasive procedures.
Implementation Method 1
detect multiple analytes through photophysical property changes
Implementation Method 2
optical sensing device capable of detecting multiple physiological analytes
Data Source
AI summary
A sensor system for optical detection of multiple analytes is discussed. An example system is presented that includes a plurality of lenses configured to receive individual light signals from analyte-sensing chromophores disposed on an array when the analyte-sensing chromophores are illuminated by light while being exposed to different specific analytes within an interstitial fluid. The system further includes at least one volume phase grating (VPG) communicatively coupled to at least one of the plurality of lenses and a detector communicatively coupled to the at least one VPG so that light signals from the analyte-sensing chromophores are focused by the plurality of lenses to the at least one VPG and transmitted to the detector. The detector being operable to generate spectra with each spectrum corresponding to an individual light signal from a single analyte-sensing chromophore.