Bellows Pump Microfluidic Mixing on Glass Slides
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Solution Overview
Problem
Current microfluidic devices for biomarker detection at the point of care face challenges in efficiently mixing small volumes and maintaining a closed system, especially when handling potentially infectious samples, which requires robust and adaptable designs compatible with solid planar substrates like glass slides.
Innovation Solution
The development of a microfluidic device using bellows pumps with flow constricting apertures for micro-eductive mixing, allowing for reciprocating flow without venting, and a fully closed system to prevent contamination, while being compatible with glass slides for biomarker detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If capillary action is used in microfluidic devices, then device simplicity and disposability are improved, but mixing efficiency during affinity capture deteriorates
Solution Approach 1:
The device is divided into separate functional modules: capillary-driven flow paths for simplicity and disposable bellows pump assemblies for active mixing. This segmentation allows each component to optimize its function without compromising the other.
Solution Approach 2:
The device transitions from static capillary flow to dynamic reciprocating flow using bellows pumps. The pumps create oscillating flow patterns that enhance mixing efficiency while maintaining the simplicity of the overall device architecture.
2Ease of operation
If open venting is used in microfluidic systems, then ease of operation is improved, but contamination risk from infectious samples increases
Solution Approach 1:
A bellows pump assembly acts as an intermediary mechanism between the sample introduction and the reaction chamber. It provides controlled fluid delivery while maintaining a closed system that prevents contamination from infectious samples.
Solution Approach 2:
The bellows pump utilizes a flexible diaphragm to create a sealed, movable barrier that allows fluid displacement while maintaining system closure. This flexible membrane enables pump operation without requiring open vents, thus preventing contamination.
3Quantity of substance
If small volumes are used in microfluidic assays, then sample volume reduction is improved, but mixing difficulty increases
Solution Approach 1:
The bellows pump employs periodic reciprocating motion to create alternating compression and expansion cycles. This periodic action generates vortex flows and enhances convective mixing, making it particularly effective for mixing small volumes where diffusion alone is insufficient.
Solution Approach 2:
The invention replaces complex mechanical mixing systems (such as microfluidic mixers with multiple channels) with a simple reciprocating bellows pump mechanism. This mechanical substitution achieves effective mixing in small volumes through straightforward oscillating motion.
4Ease of manufacture
If glass slides are used as substrates, then compatibility with existing laboratory infrastructure is improved, but device adaptability to different assay types deteriorates
Solution Approach 1:
The bellows pump assembly is designed as a universal component that can be applied to various assay types on glass slides. The same pump mechanism works for different reagent configurations, sample types, and detection methods, providing adaptability while maintaining compatibility with existing laboratory infrastructure.
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
This solution enables efficient mixing of small volumes, reduces contamination risks, and allows for real-time detection of biomarkers in a wide range of biological samples, making it suitable for both automated and manual assays at the point of care.
Implementation Method 1
pneumatic actuators for tandem operation whereby fluid is pumped back and forth through the assay chamber without venting
Implementation Method 2
the first and second flow constricting apertures are configured for micro-eductive mixing
Implementation Method 3
configured for micro-eductive mixing
Implementation Method 4
a deformable chamber having an elastic thin film cover and a mechanical actuator, the film serving to seal the body and the mechanical actuator serving to deform the film and move plugs of fluid in the body
Implementation Method 5
Capillary action has proven useful in designing small disposable diagnostic devices
Data Source
AI summary
A compact device for operatively coupling a solid planar substrate, for example a glass slide, to a microfluidic circuit and performing a reaction or reactions on organic matter bound to the face of the planar substrate. Typical reactions include binding, staining and/or labeling reactions. In use, a sealed reaction chamber is formed, the chamber enclosing the organic matter and at least a part of the solid substrate. Headspace in the sealed chamber between the solid substrate is generally of microfluidic dimensions, and diaphragm pump members are used to inject, exchange and/or mix the fluids in the chamber.