Microfluidic Cartridge With Capillary Flow and Rapid Thermal Control
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Solution Overview
Problem
Existing microfluidic systems face challenges in efficiently processing small liquid volumes with high area-to-volume ratios and require external forces to control fluid flow due to hydrophobic surfaces, lacking efficient temperature control and integration of complex functionalities.
Innovation Solution
A microfluidic apparatus comprising a polymer cartridge and a microstructured further component with high thermal conductivity, allowing capillary forces to control fluid flow, integrated with optical and thermal interfaces, and a defined surface constitution for controlled liquid processing, utilizing materials like silicon and glass for precise microstructuring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polymer materials are used for cartridge manufacture, then cost-effectiveness is improved, but fluid flow control becomes difficult due to hydrophobic surfaces
Solution Approach 1:
The patent applies different surface properties to different regions of the cartridge. The cartridge body maintains hydrophobic polymer properties for cost-effectiveness and chemical inertness, while specific channels and cavities are coated with hydrophilic materials to enable capillary-driven fluid flow. This local differentiation resolves the contradiction by allowing the polymer to remain cost-effective while specific areas gain flow-control capability.
Solution Approach 2:
The patent introduces surface coating layers as intermediary substances between the hydrophobic polymer cartridge and aqueous solutions. These coatings act as mediators that enable wetting and capillary action in specific regions without compromising the overall polymer structure and cost-effectiveness. The coating serves as an intermediate layer that bridges the incompatibility between hydrophobic material and hydrophilic fluid flow requirements.
2Ease of operation
If external pressures or rotational forces are applied to control fluid flow, then fluid flow control is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service fluid flow control through capillary forces inherent in the microstructured channels and cavities. The hydrophilic surface treatment enables the cartridge to automatically draw and move liquids through capillary action without requiring external pumps or complex force application mechanisms. This transforms the system from passive (requiring external control) to active (self-regulating through capillary forces).
Solution Approach 2:
The patent replaces mechanical fluid delivery systems (pumps, valves, external pressure applicators) with a field-based approach using capillary forces. By substituting mechanical control with surface tension-driven flow, the system achieves fluid flow control without complex mechanical components, thereby reducing device complexity while maintaining operational capability.
3Ease of manufacture
If polymer materials are used for cartridge manufacture, then cost-effectiveness is improved, but temperature control capability deteriorates
Solution Approach 1:
The patent creates a composite structure combining hydrophobic polymer materials with hydrophilic surface coatings. The polymer provides cost-effectiveness and structural integrity, while the hydrophilic coating enables both capillary flow and improved thermal contact for temperature control. This composite approach allows the cartridge to maintain its cost advantages while gaining enhanced temperature management capability through the coating layer.
4Adaptability or versatility
If microstructured components are integrated into the cartridge, then functionality is improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the cartridge into distinct functional segments: hydrophobic polymer body for structural integrity and cost-effectiveness, hydrophilic-coated channels for fluid transport, and microstructured cavities for sample processing. This segmentation allows each component to be optimized independently and manufactured using appropriate techniques, reducing overall manufacturing complexity while enhancing functionality.
Solution Approach 2:
The patent embeds microstructured cavities and channels within the polymer cartridge structure, creating a nested architecture where functional elements are integrated inside the main body. This nesting approach allows complex functionalities to be incorporated without proportionally increasing external dimensions or manufacturing complexity, as the microstructures are contained within the existing polymer framework.
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, automated processing of ultralow liquid volumes with rapid temperature control and high multiplexing capabilities, suitable for complex biochemical processes like PCR, with reduced manual intervention and compact, point-of-care diagnostics.
Implementation Method 1
Capillary forces may here be specifically utilized for processing to accomplish fluid flow
Implementation Method 2
The further component has a higher thermal conductivity than the polymer cartridge. This allows efficient temperature controlling of liquids located in the apparatus and in particular inside the further component
Data Source
AI summary
A microfluidic device for processing chemical and/or biological substances includes a polymer cartridge and at least one other component. The other component is attached to the polymer cartridge via at least one microfluidic interface