Paper Microfluidic Device for Cell Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current technologies lack applications of paper-based microfluidic devices for the separation or detection of cells, limiting their use in personalized healthcare, livestock monitoring, and food/water quality assessment, especially in low-income and middle-income countries.
Innovation Solution
A three-dimensional microfluidic device utilizing paper as a porous material with selectively sized pores for size-exclusion and biochemical functionalization for affinity separation, enabling the separation and quantification of cells in whole human blood.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If paper is viewed as a passive substrate, then the infrastructure required is minimal and raw materials are inexpensive, but the ability to detect and separate cells is limited
Solution Approach 1:
The patent utilizes paper's porous structure as a functional medium for cell separation. By controlling pore size in the paper matrix, the device achieves size-exclusion separation of cells while maintaining the simplicity of paper-based construction. The porous paper acts as both the substrate and the separation medium, enabling cell detection without complex infrastructure.
Solution Approach 2:
The patent modifies paper properties through biochemical functionalization to create affinity-based separation capabilities. By changing the chemical parameters of the paper surface, the device can selectively bind to specific cell types while maintaining the overall simplicity of the paper-based platform.
2Ease of manufacture
If paper-based microfluidic devices are used for cell separation, then low-cost platform is achieved, but manufacturing precision and device complexity increase
Solution Approach 1:
The patent leverages commercially available porous papers with controlled pore sizes for cell separation. This approach maintains cost-effectiveness while achieving precise size-exclusion separation, avoiding the need for complex custom manufacturing of porous structures.
Solution Approach 2:
The device employs multiple layers of paper with different pore sizes to achieve sequential separation of cells based on size. This segmentation approach simplifies manufacturing by using standard paper products rather than requiring precise control of single-layer pore structures.
3Adaptability or versatility
If multiple layers of paper are stacked to create 3D microfluidic networks, then cell separation capability is improved, but device complexity increases
Solution Approach 1:
The patent divides the separation function across multiple paper layers, with each layer performing a specific separation task based on pore size. This segmentation achieves complex separation capabilities while maintaining simplicity in each individual layer.
Solution Approach 2:
The patent makes each paper layer serve multiple functions: as a structural component, a flow control element, and a separation medium. This multi-functionality reduces the need for additional specialized components, thereby limiting the increase in device complexity.
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 device allows for efficient separation and quantification of cells based on size and affinity, potentially serving as a low-cost platform for identifying critical hematological indices and supporting personalized healthcare, livestock monitoring, and food/water quality assessment.
Implementation Method 1
separation and/or quantification of the cells in whole human blood via size-exclusion determined by pore size
Implementation Method 2
By patterning paper with hydrophobic barriers, hydrophilic channels can be designed to control the wicking of fluids by capillary action
Implementation Method 3
via affinity separation by biochemical functionalization of a porous material
Data Source
AI summary
A microfluidic device includes a first layer of a porous material with pores having a first average pore size and a liquid-receiving area through which a liquid sample is received into the microfluidic device. A second layer of another porous material, with pores of a second average pore size, is stacked below the first layer and has a channel with a starting end positioned at least in part in an overlapping manner with the liquid-receiving area. The channel has a terminating end extending laterally at a predetermined wicking distance from the starting end. The first average pore size and the second average pore size cause a wicking effect in which at least some of the liquid sample flows along the channel at least a portion of the wicking distance between the starting end and the terminating end.