Microfluidic Gas Exchange Device with Segmented Membrane
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Solution Overview
Problem
Existing gas exchange systems in microfluidic devices, such as hollow fiber and thin sheet membranes, face limitations in surface-to-volume ratio, control of blood flow patterns, and gas transfer efficiency, leading to performance issues in medical and industrial applications.
Innovation Solution
The development of microfluidic devices with a single layer of gas permeable material featuring optimized chambers for gas and fluid flow, where the thickness of the gas permeable material is minimized (1 µm to 100 µm) to enhance gas transfer and fluid flow properties, allowing for improved surface-to-volume ratios and precise control of blood flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If hollow fiber membranes are used for gas exchange, then gas permeability is achieved, but surface-to-volume ratio is limited and blood flow control is poor
Solution Approach 1:
The device divides the gas exchange surface into numerous individual micro-channels arranged in parallel, allowing precise control of blood flow through each channel while maintaining high total surface area. This segmentation enables independent optimization of flow patterns and gas exchange at each micro-scale interface.
Solution Approach 2:
The invention transitions from traditional two-dimensional sheet membranes to three-dimensional micro-channel structures with controlled depth and cross-section. This dimensional change allows optimization of both surface area and flow dynamics simultaneously, achieving high surface-to-volume ratios while enabling precise blood flow patterning through geometric design of the micro-channels.
2Ease of operation
If thin sheet membranes are used for gas exchange, then membrane flexibility is improved, but gas transfer efficiency is limited by boundary layer conditions and chamber configuration
Solution Approach 1:
The device creates localized high-surface-area micro-channel interfaces throughout the blood chamber, transforming the uniform thin-sheet configuration into a distributed network of optimized exchange surfaces. Each micro-channel provides localized control over flow patterns and gas exchange, eliminating boundary layer limitations while maintaining overall membrane flexibility.
3Productivity
If membrane thickness is reduced to enhance gas transfer, then gas exchange efficiency improves, but mechanical strength and support are compromised
Solution Approach 1:
The membrane structure is segmented into multiple thin micro-channel layers supported by a porous substrate. This segmentation allows each layer to be extremely thin for optimal gas exchange while the collective structure and substrate provide necessary mechanical strength. The distributed micro-channel architecture maintains structural integrity even with reduced individual layer thickness.
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 configuration improves gas transfer efficiency, reduces side effects like blood clotting, and enables more effective oxygen delivery to blood, mimicking natural gas exchange processes, while being amenable to large-scale manufacturing and various applications.
Implementation Method 1
a first layer of a single type of gas permeable material that defines therein a plurality of chambers for gas flow and a plurality of chambers for fluid flow. The thickness of gas permeable material separating any chamber for gas flow from an adjacent chamber for fluid flow is minimized so that gas can pass through the gas permeable material and into fluid in the chamber for fluid flow
Data Source
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AI summary
The invention provides systems and methods for exchanging gas in a microfluidic device, and methods for preparing such microfluidic devices. The systems and methods can be used to transfer oxygen to blood to assist lung function in a patient.