Lateral Microcapillary Array Loading for Leak-Free Sample Recovery
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Solution Overview
Problem
Existing microarray technologies for biological sample analysis often require pre-tagging or labeling, which is time-consuming and inefficient for high-throughput screening, and do not allow for the recovery of biological samples without damaging them.
Innovation Solution
A novel lateral loading system for microcapillary arrays that distributes fluid into microcapillary wells through a microcapillary array flow cell, utilizing a height limiting support member, alignment member, sealing gasket, and base layer to achieve fluid distribution perpendicular to the wells, with exit pressures lower than surface tension or capillary pressure to prevent leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluorescence or tagging methods are used for sample detection in microarrays, then detection capability is improved, but assay setup time and complexity increase significantly
Solution Approach 1:
The invention extracts the detection function from the sample itself by using evanescent wave excitation that selectively excites fluorophores only in the immediate vicinity of the waveguide surface. This eliminates the need for extensive sample labeling while maintaining detection capability, as only samples in direct contact with the waveguide are excited and detected
Solution Approach 2:
The waveguide structure acts as an intermediary between the light source and the sample. The evanescent wave generated by total internal reflection in the waveguide serves as a localized excitation field that penetrates only a short distance into the sample, enabling selective excitation without requiring sample modification
2Loss of information
If conventional microarray methods are used for sample analysis, then analytical information is obtained, but sample recovery is not possible without damaging the sample
Solution Approach 1:
The detection is confined to a very localized region immediately adjacent to the waveguide surface where the evanescent field exists. This localized detection approach allows the bulk of the sample to remain undisturbed and recoverable, as only the portion in direct contact with the waveguide is involved in the measurement
3Productivity
If high throughput screening is implemented with traditional methods, then sample numbers increase, but labeling and processing time increases proportionally
Solution Approach 1:
The system enables self-contained microarray assays where the waveguide structure itself provides the excitation field. Multiple waveguides can be integrated into a single chip, allowing parallel processing of multiple samples simultaneously without requiring proportional increases in labeling and setup time
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 efficient, high-throughput analysis and recovery of biological samples without pre-tagging, allowing for uniform fluid distribution and exchange, while maintaining sample integrity.
Implementation Method 1
the exit pressure of the fluid from the outlet hole at said bottom planar surface is lower than the surface tension of water, lower than the capillary pressure, or lower than the liquid surface tension in the microcapillary wells
Implementation Method 2
the exit pressure of the fluid from the outlet hole at said bottom planar surface is lower than the surface tension of water, lower than the capillary pressure, or lower than the liquid surface tension in the microcapillary wells
Data Source
AI summary
Lateral loading methods of use in high-throughput methods for screening large populations of variant proteins are provided. The methods utilize a flow cell encompassing large-scale arrays of microcapillaries, where each microcapillary comprises a solution containing a variant protein, an immobilized target molecule, and a reporter element. Immobilized target molecules may include any molecule of interest, including proteins, nucleic acids, carbohydrates, and other biomolecules.