Microfluidic Foil Thermal Contact for Rapid Assay
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing microfluidic cartridges for temperature-sensitive assays face challenges with slow and inaccurate temperature adjustment, which affects the accuracy and speed of biochemical assays.
Innovation Solution
A microfluidic assay system comprising a disposable cartridge with a thin foil and a sink section, where the foil is pressed against a temperature regulating element to ensure intimate contact, allowing for rapid and precise temperature control within the reaction section, and the system is designed to maintain pressure to prevent foil deflection, ensuring consistent heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a microfluidic cartridge uses a foil covering the reaction section, then the cartridge can be manufactured with simple structure, but the temperature adjustment becomes slow and inaccurate due to poor thermal contact
Solution Approach 1:
The patent employs a thin foil as a flexible thermal interface between the temperature regulating element and the reaction section. The foil's flexibility allows it to conform to the temperature regulating element's surface, ensuring intimate thermal contact while maintaining structural simplicity. This resolves the contradiction by using a thin film that is both easy to manufacture and effective for heat transfer.
Solution Approach 2:
The patent applies pressure to the foil to change its physical state from loose to tightly conforming, thereby improving thermal contact. By adjusting the pressure parameter, the system achieves accurate temperature control without complicating the overall cartridge structure, thus resolving the contradiction between manufacturing simplicity and temperature control precision.
2Manufacturing precision
If the foil is pressed against the temperature regulating element for better thermal contact, then temperature control accuracy improves, but the foil may deflect and lose contact consistency
Solution Approach 1:
The patent introduces a counteracting force mechanism that balances the pressing force on the foil. By applying a controlled counterforce, the system prevents excessive foil deflection while maintaining sufficient contact pressure for accurate temperature control. This resolves the contradiction by stabilizing the foil's contact state against the pressing force.
Solution Approach 2:
The patent employs a dynamic pressing mechanism that can adjust the force applied to the foil based on real-time conditions. This dynamic adjustment ensures consistent thermal contact without causing excessive deflection, resolving the contradiction between achieving good thermal contact and maintaining contact stability.
3Measurement precision
If washing steps are included in the assay method, then the determination accuracy may improve, but the assay time increases significantly
Solution Approach 1:
The patent extracts and eliminates the washing step from the traditional assay protocol. By removing this time-consuming operation, the system achieves rapid assay completion while maintaining determination accuracy through alternative methods such as optimized reagent formulations and improved detection techniques that do not require washing.
Solution Approach 2:
The patent skips the washing step entirely, rushing through the assay process by moving directly from incubation to detection. This approach reduces assay time significantly while maintaining accuracy through carefully designed reagents and detection methods that function effectively without the washing intermediate step.
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 approach enables fast and accurate temperature regulation of samples, reducing assay time and improving the reliability of biochemical assays by maintaining intimate contact between the foil and the temperature regulating element, thus enhancing the precision and speed of temperature adjustments.
Implementation Method 1
the foil is pressed against a temperature regulating element to ensure intimate contact, allowing for rapid and precise temperature control
Implementation Method 2
the system is designed to maintain pressure to prevent foil deflection, ensuring consistent heat transfer
Data Source
AI summary
A microfluidic assay system including a microfluidic cartridge and an associated microfluidic operator system. The microfluidic cartridge comprises a base part, having a first face with a recess and a foil fixed to the base part for covering the recess and providing a microfluidic cartridge foil face. The base part with the recess and the foil forms a flow channel and a sink in fluid communication with each other. The microfluidic cartridge comprises an inlet opening into the flow channel upstream to the reaction section.The operator system includes a piston, a temperature regulating element and an actuator positioned such that the foil face of the microfluidic cartridge can be positioned in contact with the operative system with the reaction section in close proximity to the temperature regulating element while the actuator is associated to the sink section to depress the foil covering the sink section and the piston is associated to the flow channel at an upstream valve section to depress the foil to close off the flow channel upstream to the reaction section.