Automated Micro-Volume Assay System Using Capillary Gripper
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Solution Overview
Problem
Current methods for analyzing microliter volumes of biological substances are cumbersome, time-consuming, and difficult to automate, limiting the ability to analyze multiple samples simultaneously with minimal reagent consumption and high sensitivity.
Innovation Solution
An automated assay system that uses capillaries as both pipettes and fluid paths, enabling parallel processing and detection of small volume samples through electrophoretic or isoelectric focusing, and fluorescent or chemiluminescent detection, with a capillary gripper and manifold for fluid management and a CCD array detector for data collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If manual handling and processing steps are used for analyzing microliter volumes of biological substances, then flexibility and adaptability are maintained, but the process becomes cumbersome, time-consuming, and difficult to automate
Solution Approach 1:
The patent combines multiple functions into a single integrated system. The capillary serves both as a sample container and as the separation medium, eliminating the need for separate handling steps. The system integrates sample loading, separation, and detection functions into one automated platform, resolving the contradiction between automation and complexity by consolidating operations rather than adding separate automated components for each step
Solution Approach 2:
The capillary is designed to perform multiple functions: it acts as a sample vial, a separation column, and a detection chamber. This multi-functionality reduces the number of components needed in the automated system, making automation more feasible without proportionally increasing system complexity. The universal design of the capillary allows the same component to be used throughout the analysis process
2Productivity
If multiple samples are analyzed simultaneously to improve productivity, then analysis throughput increases, but reagent consumption and system complexity increase
Solution Approach 1:
The system uses individual capillaries for each sample, allowing parallel processing of multiple samples in separate capillaries. Each capillary is a self-contained unit that requires minimal reagent volume. The segmentation of samples into discrete capillary units enables simultaneous analysis while keeping reagent consumption low, as each capillary uses only microliter volumes of reagents independent of the total number of samples being processed
Solution Approach 2:
The system uses inexpensive disposable capillaries as copies or substitutes for more complex, reusable separation systems. Each capillary is a simple, low-cost replica that can be used once and discarded, eliminating the need for cleaning and maintenance between samples. This copying approach allows high-throughput analysis without proportionally increasing reagent consumption, as the capillary infrastructure itself is minimal and reusable
3Reliability
If conventional separation and analysis methods are used, then established protocols can be followed, but the process requires extensive handling steps that adversely affect reproducibility
Solution Approach 1:
The capillary is pre-filled or pre-prepared with the separation medium before sample analysis begins. This preliminary preparation eliminates the need for time-consuming setup steps during the actual analysis. The capillary arrives ready-to-use with all necessary components in place, allowing the analysis to start immediately upon sample injection. This preliminary action significantly reduces processing time while maintaining the reliability of the separation protocol
Solution Approach 2:
The system skips intermediate handling steps by performing separation and detection within the same capillary container. Instead of transferring samples between multiple vessels and equipment, the analysis proceeds directly from sample injection through separation to detection in one continuous process. This skipping of intermediate steps reduces both processing time and potential sources of variability, improving reproducibility
4Quantity of substance
If precious reagents and expensive disposables are used in minimal volumes, then cost is reduced, but the ability to analyze multiple samples simultaneously is limited
Solution Approach 1:
The system segments the analysis into independent capillary units, each consuming minimal reagent volumes. Multiple segmented capillaries can be processed in parallel, with each requiring only microliter amounts of reagents. This segmentation allows the system to maintain low reagent consumption per sample while achieving high throughput through parallel processing of multiple segmented units simultaneously
Solution Approach 2:
The system uses disposable capillaries that are discarded after a single use, eliminating the need for time-consuming cleaning and maintenance between samples. While the capillaries themselves are discarded, the expensive reagents are conserved by using minimal volumes in each capillary. This approach trades the recovery of inexpensive disposable components for the preservation of valuable reagents, enabling high-throughput analysis with minimal reagent 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 system simplifies automation, reduces reagent consumption, and improves robustness, allowing for efficient analysis of multiple samples with high sensitivity and minimal reagent use, while providing results in a format similar to Western gel blots.
Implementation Method 1
uses capillaries, or other devices having a small internal dimension such as microchannels, as both pipettes and as the fluid paths for analysis
Implementation Method 2
conducting one or more of electrophoretic or isoelectric focusing separation
Implementation Method 3
fluorescent and chemiluminescent detection
Implementation Method 4
fluorescent and chemiluminescent detection
Data Source
AI summary
An automated assay system is described with stations for placement of materials to be used in an assay of materials inside capillaries and an automated gripper for manipulating capillaries. The system includes a separation and immobilization station where reactions inside the capillaries take place and a detector station where photoemissions from the capillary reactions are detected. The photoemissions from the capillaries may be displayed as line graphs or in columns of a pseudo-gel image resembling the familiar Western gel blot. An automated control system has a user interface by which an operator can select a run protocol and define the locations of samples and reagents to be used in the protocol run: Following the setup the control system will cause the automated system to execute the protocol, then display the results in a selected display format.