Microarray Patch Coating Detection With Reflectance and Fluorescence
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Solution Overview
Problem
Existing methods for quantifying the amount of material coating microprojections on medical devices, such as microarray patches, are destructive, cumbersome, and slow, and fail to accurately assess coating distribution without destroying the coating, particularly for the upper portions that deliver the material to the skin.
Innovation Solution
The use of electromagnetic radiation, specifically light, to detect the extent of coating on microprojections through reflectance and fluorescence measurements, allowing non-destructive and rapid assessment of coating distribution by comparing the reflectance or fluorescence signals from coated and uncoated areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If destructive methods (dissolving coating, weight comparison, fluorescence microscopy) are used to quantify coating amount, then measurement precision is improved, but productivity deteriorates due to slow processing speed and destruction of the coating
Solution Approach 1:
The patent replaces destructive mechanical/chemical methods (dissolving, weighing, microscopy) with non-destructive optical detection. A radiation source illuminates the microprojection array, and a detector measures reflected or transmitted light intensity to determine coating amount, enabling rapid quality control without destroying the coating or requiring complex sample preparation
Solution Approach 2:
The patent creates an optical copy of the coating information by measuring light interaction with the coated microprojections. The detected optical signal serves as a proxy for coating amount, allowing indirect but accurate measurement that preserves the original coating intact for potential use
2Ease of operation
If standard imaging techniques are used to detect coating, then ease of operation is improved, but measurement precision deteriorates because dried vaccine appears optically clear and lacks contrast
Solution Approach 1:
The patent exploits changes in optical properties (reflectance, absorption, fluorescence) that occur when the substrate is coated versus uncoated. By selecting appropriate radiation wavelengths and detecting the resulting optical signal changes, the system generates measurable contrast between coated and uncoated regions, enabling accurate detection of the optically clear dried vaccine coating
3Measurement precision
If coating assessment is performed on lower portions and base of microprojections, then measurement precision is improved for total coating amount, but loss of substance increases due to wasting valuable biological material
Solution Approach 1:
The patent enables spatially resolved coating assessment by detecting optical signals from specific regions of the microprojection array. The system can distinguish between coating on the upper portions (tips) versus lower portions and base, allowing quality control to focus on the functionally critical tip coating while minimizing waste of valuable biological material
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 high-speed, aseptic quantification of coating on microprojections, ensuring accurate delivery of therapeutic agents by determining the precise amount and position of the coating on microprojections, thereby enhancing treatment efficacy and reducing waste.
Implementation Method 1
a radiation source to emit radiation onto the coated microprojection array and a detector to detect the reflected radiation
Implementation Method 2
Uncoated substrate surfaces (e.g. polymers) may have different reflectance and/or a fluorescence emission spectrum from a coated substrate when the substrate is irradiated with a radiation source
Data Source
Figure 1A~1B
Figure 2A~2C
Figure 2D~2F
AI summary
The present invention relates to devices and methods for detecting the amount (degree, extent) of material coating a medical device or substrate, in particular the present invention relates to devices and methods for detecting the amount of vaccine material coating a microarray patch.