Capillary Groove Chamber Design for Consistent Diagnostic Fluid Transfer
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Solution Overview
Problem
Consumable diagnostic test devices using polypropylene surfaces experience issues with water-based solutions like elution lysis buffer adhering to surfaces, leading to reduced sample volume and inconsistent reagent concentration, causing variability and inaccuracy in nucleic acid-based diagnostic tests.
Innovation Solution
Incorporation of capillary grooves with specific cross-sectional shapes and orientations in diagnostic test devices to promote fluid flow, minimizing droplet formation and ensuring consistent transfer of sample solutions to reaction chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polypropylene surfaces are used in diagnostic test devices, then the device is cost-effective and chemically resistant, but water-based solutions adhere to the surfaces causing reduced sample volume and inconsistent reagent concentration
Solution Approach 1:
The patent applies hydrophilic coating materials that create a porous or microstructured surface layer on the polypropylene. This coating allows water-based solutions to spread uniformly rather than bead up, preventing volume loss while maintaining the underlying polypropylene's chemical resistance and cost-effectiveness.
Solution Approach 2:
The patent uses composite structures combining polypropylene base material with hydrophilic coating layers. This composite approach retains the advantageous properties of polypropylene (chemical resistance, low cost) while adding the wetting properties of hydrophilic materials to prevent solution adhesion issues.
2Ease of manufacture
If polypropylene surfaces are used in diagnostic test devices, then the device is cost-effective and chemically resistant, but droplet formation occurs leading to altered reagent concentration
Solution Approach 1:
The hydrophilic coating creates a surface structure that promotes uniform liquid distribution. This prevents droplet formation by ensuring continuous, even spreading of water-based solutions across the polypropylene surface, maintaining consistent reagent concentrations throughout the assay.
Solution Approach 2:
The patent applies hydrophilic coatings that create a homogeneous surface property across the polypropylene. This uniform hydrophilicity ensures consistent wetting behavior and prevents localized droplet formation, thereby maintaining homogeneous reagent distribution and concentration throughout the diagnostic test.
3Quantity of substance
If water-based elution lysis buffer is used to extract nucleic acids, then effective nucleic acid release is achieved, but the high polarity causes poor wetting of polypropylene surfaces
Solution Approach 1:
The hydrophilic coating acts as an intermediary layer between the high-polarity water-based elution lysis buffer and the low-polarity polypropylene surface. This intermediate layer improves wetting and fluid flow while allowing the buffer to maintain its nucleic acid extraction efficiency.
Solution Approach 2:
The patent modifies the surface energy parameters of the polypropylene by applying hydrophilic coatings. This parameter change improves the wetting properties for water-based solutions, enabling better fluid flow and distribution without altering the chemical composition or extraction efficiency of the elution lysis buffer.
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 sample availability for assays, reduces variability, and ensures accurate reagent concentration, leading to more reliable diagnostic test results by maintaining consistent sample volume and reagent distribution.
Implementation Method 1
Incorporation of capillary grooves with specific cross-sectional shapes and orientations in diagnostic test devices to promote fluid flow
Data Source
AI summary
A diagnostic test device to perform a test on a biological or environmental sample is provided. In one aspect, the diagnostic test device includes a chamber configured to receive a fluid from a sample preparation reservoir at a first section of the chamber, and a plurality of spaced apart valleys along an inner surface of the at least one chamber. Each of the plurality of spaced apart valleys include a curved cross-section and is configured to promote flow of the fluid toward a second section of the at least one chamber.