Static-Dissipative Column Tube Holder for Accurate Assay Droplets
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Solution Overview
Problem
Cancer-screening assays face challenges due to limited sensitivity and specificity, leading to high rates of false-positive and false-negative results, and column tube holders made of certain materials can cause assay liquids to adhere to surfaces due to localized electrical charges, affecting accuracy.
Innovation Solution
A column tube holder constructed with conductive, anti-static, or static dissipative materials, featuring vertically extending side rails and horizontally extending shelves with aligned holes, and equidistant sidewalls to balance electrical forces and prevent droplet adherence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If column tube holders are constructed of polymer materials or materials that allow localized electrical charges to build up, then the holder structure is simple and easy to manufacture, but assay liquids adhere to the sidewalls of column tubes and receiving tubes due to electrostatic attraction, reducing assay accuracy
Solution Approach 1:
The patent changes the electrical properties parameter of the column tube holder material from insulating (polymer) to conductive or static-dissipative. This parameter change eliminates localized charge buildup by allowing charges to distribute uniformly across the holder surface, preventing electrostatic attraction of assay liquids to sidewalls and thereby improving assay accuracy while maintaining manufacturing simplicity through available conductive materials like metal-coated plastics or inherently conductive polymers
2Measurement precision
If column tube holders use conductive or static dissipative materials to prevent charge buildup, then assay accuracy is improved, but the device complexity increases due to material selection constraints
Solution Approach 1:
The patent employs composite materials that combine structural integrity with conductive or static-dissipative properties. Examples include metal-coated plastic holders (plastic substrate with conductive metal coating), carbon-loaded polymers, or metal alloys with appropriate surface treatments. These composite solutions maintain the ease of manufacturing injection-molded plastic holders while adding the necessary electrical properties to prevent charge buildup, thus improving accuracy without significantly increasing device complexity
Solution Approach 2:
The patent modifies the electrical conductivity parameter of the holder material within a specific range (10^-12 to 10^-18 ohm-cm for static-dissipative materials) to achieve the optimal balance between preventing charge buildup and maintaining manufacturability. This parameter optimization allows using modified plastic materials that can be manufactured using existing processes while providing sufficient charge dissipation to improve assay accuracy
3Stability of the object's composition
If localized electrical charges attract droplets of analyte, then the holder material properties are maintained, but droplets land on sidewalls or edges of receiving tubes instead of falling accurately into the tube, reducing assay reliability
Solution Approach 1:
The patent changes the surface electrical properties of the holder from charge-retaining to charge-dissipating by selecting materials with specific conductivity parameters. This parameter change eliminates the electrostatic attraction force that causes droplet deviation, ensuring droplets fall vertically into receiving tubes based on gravity alone, thereby improving assay reliability while maintaining the holder's structural material properties
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
Enhances the accuracy of assays by minimizing the build-up of localized electrical charges, ensuring droplets fall accurately into receiving containers without adhering to the holder or sidewalls, thereby improving the reliability of cancer detection tests.
Implementation Method 1
column tube holders (for example, those used in connection with size-exclusion columns to purify extracellular vesicles from plasma) are often constructed of a polymer material or other material that allows for the build-up of localized electrical charges, which in turn can cause assay liquids such as samples, droplets, and analytes to adhere to the sidewalls of column tubes, receiving tubes, and/or reservoirs
Implementation Method 2
The present disclosed embodiments include assay equipment and systems for holding column tubes (for example size-exclusion columns used to purify extracellular vesicles from plasma, among others) that equalize the electrical forces acting on molecules and droplets
Data Source
AI summary
A column tube holder includes: a first side rail extending vertically; a second side rail extending vertically; a first shelf extending horizontally between the first side rail and the second side rail; a second shelf extending horizontally between the first side rail and the second side rail, the second shelf disposed below the first shelf; and a third shelf extending horizontally between the first side rail and the second side rail, the third shelf disposed below the second shelf. The column tube holder is composed of a conductive material, an anti-static material, and/or a static dissipative material.