Microfluidic Porous Element Locking for Clog-Free Sample Perfusion
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Solution Overview
Problem
Conventional microfluidic devices face issues with sample displacement and clogging due to increased flow rates, leading to non-uniform diffusion and potential blockage of channels, which affects the reproducibility and standardization of sample processing.
Innovation Solution
A microfluidic device configuration with a porous element that locks into place using friction, ensuring the sample remains fixed during solution injection, allowing uniform perfusion and preventing channel clogging, and utilizing a matrix with open pores to mimic body conditions for cell culture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the solution is injected through the inlet channel to perfuse the sample, then the sample can be contacted with the solution for analysis, but the increased flow rate displaces the sample towards the outlet channel causing clogging
Solution Approach 1:
A porous element is introduced as an intermediary component between the sample and the solution flow. This porous element allows the solution to pass through while physically blocking the sample from being displaced towards the outlet channel, thus preventing clogging while maintaining perfusion functionality
Solution Approach 2:
The porous element is positioned in advance to counteract the displacement force generated by the solution flow. By having the porous element in place before solution injection, it pre-establishes a barrier that prevents the sample from moving towards the outlet channel when the solution is injected
2Stability of the object's composition
If the sample is not attached to the bottom wall to maintain its natural morphology, then the sample structure is preserved, but the sample or scaffold is displaced by solution injection causing non-uniform diffusion
Solution Approach 1:
The porous element serves as a mediator that supports the sample without requiring attachment to the bottom wall. It provides a stable base that maintains sample position while allowing natural morphology, and simultaneously prevents displacement during solution injection through the frictional locking mechanism
Solution Approach 2:
The porous element is prepared in advance with dimensions that enable frictional locking in the chamber. This preliminary configuration ensures that when the sample is placed on the porous element, the assembly is pre-positioned to remain stable during solution injection, eliminating the need for bottom wall attachment
3Reliability
If the porous element size matches the chamber opening for friction-based locking, then the sample remains fixed during solution injection, but the device complexity increases due to the locking mechanism
Solution Approach 1:
The porous element is designed to automatically lock into position through friction between its lateral surface and the chamber opening. This self-locking mechanism eliminates the need for additional locking components or complex assembly procedures, achieving reliable position stability while minimizing device complexity
Solution Approach 2:
The locking mechanism relies on changing the friction parameter by matching the porous element dimensions to the chamber opening. By optimizing the size and surface characteristics of the porous element, sufficient friction is generated to maintain sample position stability without requiring mechanical locking components
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
The solution enables standardized and reproducible sample processing by maintaining the sample's position, facilitating uniform diffusion and preventing channel blockage, while supporting cell viability and interaction, enhancing the reliability of analysis techniques like NMR and PET.
Implementation Method 1
the porous element may be configured to ensure that, when a solution is injected into the chamber, a frictional force resulting from the contact between the porous member and the chamber is greater than the force generated by the solution flowing through the sample and the porous element
Implementation Method 2
there may be no diffusion of the solution within the sample or the scaffold
Data Source
Figure 1~2c
Figure 3~4b
Figure 5a~6
AI summary
In one aspect, a microfluidic device is provided. The microfluidic device comprises an inlet channel, a chamber, a porous element configured to receive a sample, and an outlet channel. The porous element is configured to be inserted in the chamber through the opening until the porous element reaches a locking position. In a further aspect, a system comprising the microfluidic device, a solution comprising a label, and an apparatus is provided. In a further aspect, a method for obtaining a signal of the detection complex is provided.