3D Microfluidic Artificial Lung Channels for Portable Gas Exchange
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Solution Overview
Problem
Current artificial lung systems are limited by high device-mediated complications, inflammation, device clotting, and hemolysis, especially in longer cases, and lack portability and biocompatibility, restricting their use to ICU settings and minimal ambulation.
Innovation Solution
Microfluidic artificial lungs with 3D-printed and roll-to-roll manufacturing techniques to create large-scale devices with optimized blood flow networks and gas exchange regions, mimicking natural lung structures, using materials like PDMS for gas and liquid pathways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional artificial lung systems are used, then respiratory support can be provided, but device-mediated complications including inflammation, device clotting, and hemolysis occur frequently
Solution Approach 1:
The device is divided into numerous small capillary channels (micron-scale) rather than a few large channels. This segmentation increases the total surface area for gas exchange while reducing the blood contact time per unit area, thereby decreasing device-mediated complications like inflammation and clotting while maintaining reliable respiratory support.
Solution Approach 2:
The patent creates regions with different capillary densities and dimensions optimized for specific functions. By varying the local characteristics of blood flow paths and gas exchange surfaces, the device achieves optimal gas exchange efficiency in critical regions while minimizing harmful effects in other areas, improving overall device reliability.
2Adaptability or versatility
If traditional artificial lung systems are used, then respiratory support is available, but the systems are not portable and are limited to ICU settings
Solution Approach 1:
The patent transitions from two-dimensional flat membrane gas exchange surfaces to three-dimensional networks of capillary channels. This dimensional change enables compact packaging of large gas exchange surface areas within a small volume, making the device portable while maintaining sufficient respiratory support capability for various settings beyond ICU.
3Productivity
If microfluidic artificial lungs with micron-scale channels are used, then gas exchange efficiency is improved and device size is reduced, but the blood flow capacity is insufficient for human applications
Solution Approach 1:
By creating three-dimensional networks of capillary channels rather than planar membranes, the device achieves vastly increased surface area within a compact volume. This enables both high gas exchange efficiency and sufficient blood flow capacity to be achieved simultaneously, resolving the contradiction between efficiency and capacity.
Solution Approach 2:
The blood flow path is divided into numerous parallel capillary channels, allowing the total blood flow capacity to be scaled by increasing the number of channels rather than increasing individual channel size. This maintains the micron-scale dimensions needed for efficient gas exchange while achieving human-level blood flow capacity through parallel processing.
4Weight of moving object
If current artificial lung systems are used, then respiratory support is provided, but the devices are large and not portable
Solution Approach 1:
The transition to 3D capillary networks allows the device to pack a large gas exchange surface area into a small volume, dramatically reducing device size and weight while maintaining sufficient respiratory support effectiveness through the high surface area-to-volume ratio of the microfluidic structure.
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
Enables improved gas exchange efficiency, increased biocompatibility, reduced device size, and portability, allowing respiratory support for active patients and ambulatory care, with potential for long-term treatment and semi-permanent support.
Implementation Method 1
The plurality of capillary elements are formed from a material that permits diffusion of gas from the gas flow pathway into liquid (e.g., blood) within the plurality of capillary elements
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3D
AI summary
Disclosed herein are rolled-membrane microfluidic diffusion devices and corresponding methods of manufacture. Also disclosed herein are three-dimensionally printed microfluidic devices and corresponding methods of manufacture. Optionally, the disclosed microfluidic devices can function as artificial lung devices.