Microarray Printing Quality Control via Real-Time Image Inspection
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Solution Overview
Problem
Existing microarray printing technologies face challenges in real-time quality control during the printing process, leading to costly and time-consuming corrective actions after the completion of a print job due to issues like nozzle blockages, sample precipitation, and unsuitable viscosity, which result in misplaced or malformed spots.
Innovation Solution
A method and device that utilize cameras to capture images of microarrays during each print pass, process these images to calculate quality parameters, identify defects, classify them as random or non-random, and take corrective actions such as reagent loading or nozzle substitution before subsequent passes to improve print quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If quality inspection is performed only after the complete print job, then device complexity is reduced, but productivity is worsened due to additional reagent loading and time-consuming corrective actions
Solution Approach 1:
The patent implements quality inspection during the print job execution, performing preliminary detection of printing defects before the entire print job completes. This allows corrective actions to be taken mid-process, preventing waste of remaining reagents and improving overall productivity without requiring complete re-printing of all slides.
Solution Approach 2:
The system continuously monitors print quality during the printing process and provides real-time feedback about detected defects. This feedback mechanism enables dynamic adjustment of printing parameters or corrective actions during the print job, transforming a static post-print inspection approach into an active quality control process that improves productivity.
2Manufacturing precision
If real-time quality inspection is implemented during each print pass, then manufacturing precision is improved through immediate defect detection, but device complexity increases due to additional cameras and processing systems
Solution Approach 1:
The patent introduces a camera system as an intermediary inspection device that captures images of the substrate during printing. This intermediary measurement system enables non-contact quality assessment without interfering with the printing process, achieving high manufacturing precision while maintaining relatively simple device architecture through optical rather than mechanical inspection methods.
3Ease of operation
If printing defects are not detected until the end of the print job, then ease of operation is maintained with simple inspection procedures, but loss of substance increases due to wastage of reagents that cannot be corrected
Solution Approach 1:
The inspection system performs preliminary detection of printing defects during the print job execution rather than waiting until completion. This preliminary action identifies issues such as nozzle blockages or misplaced spots early enough to trigger corrective actions, preventing wastage of remaining reagents in the print head and significantly reducing substance loss.
Solution Approach 2:
The system implements a feedback loop where quality inspection results from each print pass are immediately analyzed and used to trigger corrective actions during the same print job. This real-time feedback prevents continued production of defective microarrays, reducing reagent wastage while maintaining operational simplicity through automated decision-making.
Data Source
AI summary
Method for manufacturing microarrays and verifying the quality of said microarrays, wherein the method comprises: a) providing at least one reagent, b) loading said at least one reagent in a dispensing print head, in a predetermined arrangement, c) in a first print pass, generating instructions for the print head and moving said print head with respect to a substrate to print said at least one reagent on the substrate to obtain microarrays, d) obtaining an image of the printed microarrays by means of a camera, e) processing the obtained images of the printed microarrays, to calculate parameters indicative for the quality of the printed microarrays, f) comparing, at the end of the first print pass, the calculated parameters for the printed microarrays with predetermined criteria for the microarrays, to identify possible printing defects, g) comparing, for the printed microarrays, the identified printing defects of step f), h) using the outcome of the comparison of step g) to select a corrective action to improve the quality of the microarrays, prior to the printing of a subsequent print pass.