Microfluidic Particle Aggregation Limiter for Fluid Sensing
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Solution Overview
Problem
Existing fluid sensing devices are often large, complex, and expensive, requiring large samples and generating significant waste, while being susceptible to blockages due to particle aggregation in their sensing zones.
Innovation Solution
A microfluidic sensing system with a particle aggregation limiter that uses passive and active filtering structures to inhibit particle aggregation, employing microfluidic pumps and sensors to ensure reliable fluid flow and accurate sensing of small fluid samples, utilizing a constricted inlet to facilitate individual cell or particle analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a microfluidic sensing system is used to reduce sample size and cost, then sample volume and waste are reduced, but particle aggregation causes blockages in the sensing zone
Solution Approach 1:
The patent applies preliminary action by implementing a particle aggregation limiter that proactively prevents particle aggregation before it can cause blockages in the sensing zone. The limiter includes filtering structures and pumping mechanisms that are activated beforehand to maintain particle dispersion, ensuring reliable fluid flow through the microfluidic channel during the sensing process.
Solution Approach 2:
The particle aggregation limiter serves as an intermediary component between the fluid source and the sensing zone. It includes intermediate filtering structures and pumping mechanisms that mediate the fluid flow, preventing direct interaction between aggregated particles and the sensing zone, thereby maintaining flow reliability while using small sample volumes.
2Reliability
If filtering structures are added to prevent particle aggregation, then flow reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into the particle aggregation limiter component. The limiter integrates filtering structures, pumping mechanisms, and sensing capabilities into a single unified device, reducing overall system complexity while maintaining flow reliability. The microfluidic channel itself serves multiple purposes as both the flow path and the sensing zone.
Solution Approach 2:
The particle aggregation limiter is designed with multi-functionality, serving as both a filtering mechanism and a flow control device. The same structures that prevent particle aggregation also regulate fluid flow and can be integrated with sensing functions, reducing the need for separate components and simplifying the overall device architecture.
3Measurement precision
If a constricted inlet is used to facilitate individual cell analysis, then measurement precision is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs parameter changes by gradually transitioning the channel dimensions from a wider inlet to a constricted sensing zone. This gradual transition reduces the manufacturing precision requirements at the inlet while still achieving the necessary constriction for individual cell analysis. The channel width and height parameters are optimized to balance manufacturing feasibility with measurement precision.
Data Source
AI summary
An apparatus includes a chamber, a nozzle connected to the chamber, a fluid driver proximate the driver to expel fluid from the chamber through the nozzle, a microfluidic passage, an inlet connecting the microfluidic passage and the chamber, a sensor proximate the inlet to sense fluid within a fluid sensing zone within the inlet, and a particle aggregation limiter to control aggregation of particles within the sensing zone.