Microdispensing Device with Optical Light Barrier for Dosing Accuracy
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Solution Overview
Problem
Existing multi-channel microdispensing devices face issues with irregularities and disturbances in the metering process due to contamination or wear, leading to incorrect dosing, which cannot be effectively monitored or corrected automatically, affecting the quality and accuracy of liquid delivery in high-throughput biological assays and cell culture applications.
Innovation Solution
The implementation of a device with a light barrier unit consisting of a light source and sensor for each dosing channel, utilizing a profiled light beam to monitor and evaluate the position and quality of liquid drops or spurts, allowing for automatic detection and compensation of deviations from the ideal direction and quality, using a programmed evaluation unit to analyze the sensor signals and generate control signals for actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-channel microdispensing devices are used for high-throughput liquid handling, then productivity is improved, but reliability deteriorates due to uncontrollable dosing errors from contamination and wear
Solution Approach 1:
The patent implements optical sensors that detect the presence and position of liquid droplets as they are dispensed from each channel. This feedback mechanism allows the system to monitor dosing accuracy in real-time and identify errors caused by contamination or wear, enabling corrective actions to maintain reliability while preserving high-throughput productivity
2Measurement precision
If manual monitoring of dosing errors is implemented, then measurement precision is improved, but productivity deteriorates due to loss of time and inability to maintain sterility
Solution Approach 1:
The patent replaces manual visual inspection with an automated optical sensing system. Light barriers and sensors automatically detect droplet formation, position, and delivery accuracy, providing precise measurement of dosing errors without requiring manual intervention. This maintains both high measurement precision and productivity while preserving sterility through contactless monitoring
3Measurement precision
If optical monitoring systems are added to detect droplet position and quality, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The optical monitoring system is segmented into modular units, with individual light barriers and sensors assigned to specific dosing channels or groups of channels. This segmentation allows the complex monitoring function to be implemented in a distributed, manageable way that reduces overall system complexity while maintaining high measurement precision for droplet position and quality detection
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 continuous, automatic monitoring and compensation of liquid dispensing, ensuring accurate and consistent delivery of small volumes, thereby improving the reliability and efficiency of biological assays and cell culture processes by preventing manual intervention and maintaining sterility.
Implementation Method 1
registering the respective attenuation of the intensity integrated over the width of the light beam when shaded through this liquid drop or spurt
Data Source
AI summary
Means and methods for dispensing small amounts of liquid from multi-channel microdispensing devices, suitable for use in automatic processing in biological assays and for the cultivation of cells and tissues, by means of optical control of the dosed liquid by specific light barrier units.