Microfluidic Cartridge Pneumatic Mixing and Gas Ventilation
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Solution Overview
Problem
Existing microfluidic cartridges struggle to reproducibly resuspend sedimented particles within biological samples for precise analysis, often requiring rotating parts or inefficient gas management, which can lead to particle concentration variability and reagent degradation.
Innovation Solution
A cartridge design featuring a single compressible fluid pump with a conduit extending to the fluid outlet, allowing for pressure-driven fluid flow to resuspend particles without rotating parts, combined with a baffle system for controlled gas ventilation to maintain pressure equilibrium and prevent reagent degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rotating parts are used to resuspend sedimented particles, then particle mixing is achieved, but device complexity increases and reliability decreases
Solution Approach 1:
The patent replaces rotating mechanical mixing parts with a pneumatic system. A gas inlet introduces gas into the liquid sample, creating bubbles that rise and generate vertical flow patterns. This pneumatic agitation resuspends sedimented particles without requiring any rotating mechanical components, thereby reducing device complexity while maintaining reliable particle mixing.
2Reliability
If gas ventilation is not controlled, then pressure equilibrium is difficult to maintain, but reagent degradation increases due to ambient gas influx
Solution Approach 1:
The patent introduces a controlled gas inlet as an intermediary system between the external environment and the liquid sample. This controlled gas introduction mechanism serves as a mediator that maintains pressure equilibrium while preventing uncontrolled ambient gas influx that would cause reagent degradation. The gas inlet allows selective gas exchange without requiring complex sealed systems.
Solution Approach 2:
The patent employs pneumatic principles by using controlled gas introduction into the liquid sample. The gas flow creates pressure equilibrium and prevents vacuum formation during liquid dispensing, while the controlled nature of the gas inlet prevents excessive ambient gas influx that would degrade reagents. This pneumatic approach simplifies gas management compared to complex mechanical pressure control systems.
3Measurement precision
If a compressible fluid pump is used to resuspend particles, then particle distribution becomes reproducible, but device complexity increases
Solution Approach 1:
The patent designs the gas inlet system to serve multiple functions: it introduces gas for particle resuspension, creates pressure equilibrium during liquid dispensing, and prevents vacuum formation. By combining these functions into a single gas management mechanism, the system achieves reproducible particle distribution without requiring separate complex pumping systems for each function.
Solution Approach 2:
The patent uses pneumatic principles where gas flow through the liquid sample creates controlled agitation for particle resuspension. The gas bubbles rise through the liquid, creating vertical flow patterns that redistribute particles uniformly. This pneumatic mixing approach achieves reproducible particle concentration without requiring mechanical pumps or rotating mixers.
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
Ensures precise and reproducible particle suspension and distribution, minimizing reagent degradation by maintaining a consistent particle concentration and reducing ambient gas influx, thus enhancing the accuracy and reliability of microfluidic analyses.
Implementation Method 1
Upon applying pressure onto the elastic pumping element the elastic pumping element is compressed, thereby compressing a pumping volume within the pumping element. The pressure on the pumping volume causes the pumping volume to move towards the conduit which ultimately leads to a flow of fluid from the conduit.
Implementation Method 2
In this case 'elastic' means, that application of force or pressure onto the pumping element causes the pumping element to change its shape. However once the force or pressure vanishes the pumping element will return to its original shape by itself.
Implementation Method 3
The reservoir chamber comprises an inlet for receiving the ventilation gas... The cartridge further comprises a baffle means for restricting gas diffusion through the inlet.
Data Source
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AI summary
The invention relates to a cartridge for dispensing a fluid (104), wherein the cartridge comprises: - a reservoir chamber (102) operable for receiving the fluid, the reservoir chamber having a fluid outlet (116), - a controllable dispenser component (118) for dispensing a dispensing volume (101) of the fluid from the reservoir chamber, the dispenser component being connected to the fluid outlet of the reservoir, - a single compressible fluid pump (107) with a single elastic pumping element (109, 120), - a conduit (111) extending from the fluid pump towards the fluid outlet, the fluid pump being operable to discharge a mixing volume (124) of the fluid from the conduit into the reservoir chamber upon compression of the elastic pumping element, the mixing volume depending on the degree of compression of the elastic pumping element, and the fluid pump being operable to suck in the mixing volume from the reservoir into the conduit upon decompression of the elastic pumping element.